Five-second answer

Claim we investigated

Washington's millionaires tax can reach households where no one earns $1 million a year: couples share one deduction, one-time income counts in full, and the threshold keeps up with only about half of inflation.

True. Couples share one $1 million deduction, one-time income counts fully, and the threshold keeps only about half of inflation. The enacted law, the Legislature's own bill report and amendment votes, the Attorney General's ballot statement, and worked examples from the statute show four routes by which households with no $1 million earner can owe the tax: a shared deduction, one-time income, capital gains counted toward the line, and partial inflation indexing.

Quote or cite this fact-check

FactHub rates the claim “Washington's millionaires tax can reach households where no one earns $1 million a year: couples share one deduction, one-time income counts in full, and the threshold keeps up with only about half of inflation” True (high confidence): Couples share one $1 million deduction, one-time income counts fully, and the threshold keeps only about half of inflation. Reviewed October 22, 2026. https://facthub.org/n/article/wa-millionaires-tax-who-it-affects/6

One-minute summary

What the evidence establishes

  • Established. Spouses and registered domestic partners share one $1 million deduction, even if they file separately: a couple earning $550,000 each owes $9,900, while the same two people unmarried owe nothing.
  • Established. The base starts from federal adjusted gross income with no averaging, so a one-time RSU vest, 401(k) withdrawal or inherited IRA counts in full in the year received; amendments for averaging and for excluding equity pay failed.
  • Established. Long-term gains taxed by the capital gains tax are added back into the base and credited, so by our reading a $600,000 stock gain can make $800,000 of wages taxable.
  • Established. The threshold is adjusted only in odd-numbered years by one year of inflation; at 2.5% inflation it is worth about $821,000 in 2026 dollars by 2040, and our projection is about 31,000 to 33,000 paying households then instead of about 25,000.
  • Context. Home sales and other real estate gains, qualifying family-business sales and retirement-account assets stay outside the capital gains base, and amounts owed just over the line are small.
  • Not shown. How many two-earner couples will pay only because they share a deduction is not known: no public data splits couples by each spouse's income.
Important context: Washington's 9.9% tax on household income over $1 million (ESSB 6346, chapter 238, Laws of 2026) applies from tax year 2028, with first payments in April 2029; Initiative 645 on the November 3, 2026 ballot would repeal it. This article examines who the law as written can reach. It does not take a side on I-645, and it does not predict whether a future Legislature will change the threshold, which a separate fact check covers. Every household that owes the tax has more than $1 million of Washington income in the year it pays; the question is whose income that is and how often.

The evidence

The conclusion rests on the combined record. Expand each item to see its role and limitations.

Independence note: This check uses 5 methods across 3 institutions and 1 country or international grouping.
Evidence map
Method Institution / country Year(s) What it shows Key limitation Primary links
Statutory text, the Legislature's final bill report and the Attorney General's ballot explanation, with recorded votes on amendments and a worked example Washington State Legislature, Washington Attorney General's Office, The Startup Law Blog United States 2026 The final bill report says spouses' or domestic partners' 'combined standard deduction is limited to $1 million, regardless of whether they file joint or separate returns', and the Attorney General's statement in the voters' pamphlet says a couple 'shares a single' deduction. In our worked example, a married couple earning $550,000 each has $1.1 million of base income and owes $9,900; as two single filers the same people would owe nothing. House amendments to give each spouse a $1 million deduction, or couples $1.5 million, both failed 47-49 on March 9, 2026, and a Senate amendment for $2 million on joint returns failed 20-29. No public data identifies how many couples have two earners each below $1 million, so the number of households that pay only because of this rule is unknown. In 2022, 84% of Washington returns with $1 million or more of income were joint returns, but most of those have one high earner. Washington State Legislature, Senate Committee Services Washington Secretary of State Joe Wallin, The Startup Law Blog Washington State Legislature FactHub FactHub FactHub
Statutory text and bill report on the tax base, amendment texts and votes, and worked examples Washington State Legislature, FactHub, The Startup Law Blog United States 2026 Washington taxable income 'starts with federal AGI', which includes wages from vesting RSUs and exercised options, pension and IRA distributions, and taxable Social Security. Nothing in the law averages a spike. In our examples, a household with a $250,000 salary and a one-time $900,000 RSU vest owes $14,850 (($1,150,000 - $1,000,000) x 9.9%), as does a retired couple with $150,000 of pension and Social Security who withdraw $1 million from a 401(k) in one year. An heir with $200,000 of other income who takes a $4 million inherited IRA in a single year owes $316,800 (($4,200,000 - $1,000,000) x 9.9%), but owes nothing if the withdrawals are spread over 10 years ($400,000 a year plus $200,000 is $600,000, under the deduction). Rep. Klicker's amendment to base the tax on 'a five-year average' failed 43-51, and Rep. Stokesbary's to exclude the 'non-cash value of qualified equity compensation' failed 40-53. Joe Wallin notes that first-time payers also get no prior-year safe harbor for estimated tax. The examples are illustrations, not counts of how many such households exist. Households that can time income, such as an heir who spreads an inherited IRA over 10 years, can often avoid crossing the line. Washington State Legislature, Senate Committee Services FactHub Washington State Legislature Washington State Legislature FactHub Joe Wallin, The Startup Law Blog
Reading of the bill's base and credit provisions, with a worked example Washington State Legislature, FactHub United States 2026 The bill report says the base excludes long-term capital gains, then adds back 'net long-term capital gains subject to Washington's capital gains tax' and the capital gains standard deduction, and a credit is 'available for any Washington capital gains tax paid'. So gains are not taxed twice, but they count toward the $1 million line. In our example, a household with $800,000 of wages and a $600,000 stock gain pays $22,540 of capital gains tax and $17,060 of the new tax; without the sale it would owe no new tax. In effect the household pays the larger of the two taxes. This is our reading of sections 205 and 302; the Department of Revenue has not issued rules. It applies only to gains the capital gains tax already reaches, not to real estate or family-business sales. Washington State Legislature, Senate Committee Services FactHub
Statutory text compared with the capital gains tax's indexing rule, and a projection at constant inflation Washington State Legislature, Washington Attorney General's Office, FactHub, The Startup Law Blog United States 2026, 2028, 2040, 2050 Section 316 adjusts the deduction 'October 2029 and each October of an odd-numbered year thereafter' by the change in the consumer price index over 'the prior 12-month period', so each adjustment captures one year of inflation and covers two. The capital gains tax deduction uses the same formula 'each October thereafter'. The bill report itself says both 'adjusted annually' and 'every second year', and the Attorney General's statement says only that the deduction 'is increased to account for inflation'. FactHub's projection: at 2.5% inflation the threshold is worth $952,000 in 2026 dollars in 2028, $821,000 in 2040 and $725,000 in 2050, while annual indexing would hold it near $952,000. Holding real incomes constant, that means about 31,000 to 33,000 paying households in 2040 and 38,000 to 42,000 in 2050, against about 25,000 with annual indexing. Section 314 and the bill report call the adjustment annual, so the Department of Revenue could read section 316 differently, and the Legislature could fix it. The projection holds real incomes and population constant, assumes 2.5% inflation and approximates the income distribution near $1 million; it isolates the indexing rule and is not a forecast. Real income growth would add payers under any rule. Washington State Legislature Washington State Legislature Washington State Legislature, Senate Committee Services Washington Secretary of State FactHub FactHub Joe Wallin, The Startup Law Blog Washington State Standard (via The Inlander)
Statutory text of the capital gains exemptions the new tax adopts, with worked examples Washington State Legislature, FactHub United States 2021, 2026 The capital gains tax does not apply to 'All real estate transferred by deed', retirement-account assets or qualifying family-business sales, and the new tax removes those gains from its base. In our example, a household with $400,000 of wages that sells its home for a $1.5 million gain owes nothing under the new tax. Near the line the amounts are small: the two-earner couple at $1.1 million pays $9,900, 0.9% of its income. These exemptions are ordinary statutes a later Legislature could change by simple majority. Ordinary depreciation recapture on equipment and pass-through business income are not exempt. Washington State Legislature FactHub
1. Couples share one $1 million deduction Statutory text, the Legislature's final bill report and the Attorney General's ballot explanation, with recorded votes on amendments and a worked example

The final bill report says spouses' or domestic partners' 'combined standard deduction is limited to $1 million, regardless of whether they file joint or separate returns', and the Attorney General's statement in the voters' pamphlet says a couple 'shares a single' deduction. In our worked example, a married couple earning $550,000 each has $1.1 million of base income and owes $9,900; as two single filers the same people would owe nothing. House amendments to give each spouse a $1 million deduction, or couples $1.5 million, both failed 47-49 on March 9, 2026, and a Senate amendment for $2 million on joint returns failed 20-29.

Limit: No public data identifies how many couples have two earners each below $1 million, so the number of households that pay only because of this rule is unknown. In 2022, 84% of Washington returns with $1 million or more of income were joint returns, but most of those have one high earner.

Verify: Final Bill Report, ESSB 6346 (2026) 2026 General Election Voters' Pamphlet, Edition 9 (Pierce County): Initiative Measure IP26-645 Washington's 9.9% Income Tax: The Marriage Penalty in ESSB 6346 (and How to Plan) Amendment 6346-S.E AMH WALE TAYT 601 (Rep. Walen) Ten illustrative households under the law as enacted Floor amendments on couples, one-time income, retirement income and expansion, with votes What Washington's $1 million-plus returns reported, 2022

2. One-time income counts in full, with no averaging Statutory text and bill report on the tax base, amendment texts and votes, and worked examples

Washington taxable income 'starts with federal AGI', which includes wages from vesting RSUs and exercised options, pension and IRA distributions, and taxable Social Security. Nothing in the law averages a spike. In our examples, a household with a $250,000 salary and a one-time $900,000 RSU vest owes $14,850 (($1,150,000 - $1,000,000) x 9.9%), as does a retired couple with $150,000 of pension and Social Security who withdraw $1 million from a 401(k) in one year. An heir with $200,000 of other income who takes a $4 million inherited IRA in a single year owes $316,800 (($4,200,000 - $1,000,000) x 9.9%), but owes nothing if the withdrawals are spread over 10 years ($400,000 a year plus $200,000 is $600,000, under the deduction). Rep. Klicker's amendment to base the tax on 'a five-year average' failed 43-51, and Rep. Stokesbary's to exclude the 'non-cash value of qualified equity compensation' failed 40-53. Joe Wallin notes that first-time payers also get no prior-year safe harbor for estimated tax.

Limit: The examples are illustrations, not counts of how many such households exist. Households that can time income, such as an heir who spreads an inherited IRA over 10 years, can often avoid crossing the line.

Verify: Final Bill Report, ESSB 6346 (2026) Ten illustrative households under the law as enacted Amendment 6346-S.E AMH KLIC REIN 502 (Rep. Klicker) Amendment 6346-S.E AMH STOK TAYT 587 (Rep. Stokesbary) Floor amendments on couples, one-time income, retirement income and expansion, with votes Washington's Income Tax Has No Prior-Year Safe Harbor for First-Time Filers

3. Capital gains can push wages over the line Reading of the bill's base and credit provisions, with a worked example

The bill report says the base excludes long-term capital gains, then adds back 'net long-term capital gains subject to Washington's capital gains tax' and the capital gains standard deduction, and a credit is 'available for any Washington capital gains tax paid'. So gains are not taxed twice, but they count toward the $1 million line. In our example, a household with $800,000 of wages and a $600,000 stock gain pays $22,540 of capital gains tax and $17,060 of the new tax; without the sale it would owe no new tax. In effect the household pays the larger of the two taxes.

Limit: This is our reading of sections 205 and 302; the Department of Revenue has not issued rules. It applies only to gains the capital gains tax already reaches, not to real estate or family-business sales.

Verify: Final Bill Report, ESSB 6346 (2026) Ten illustrative households under the law as enacted

4. The $1 million line keeps up with only about half of inflation Statutory text compared with the capital gains tax's indexing rule, and a projection at constant inflation

Section 316 adjusts the deduction 'October 2029 and each October of an odd-numbered year thereafter' by the change in the consumer price index over 'the prior 12-month period', so each adjustment captures one year of inflation and covers two. The capital gains tax deduction uses the same formula 'each October thereafter'. The bill report itself says both 'adjusted annually' and 'every second year', and the Attorney General's statement says only that the deduction 'is increased to account for inflation'. FactHub's projection: at 2.5% inflation the threshold is worth $952,000 in 2026 dollars in 2028, $821,000 in 2040 and $725,000 in 2050, while annual indexing would hold it near $952,000. Holding real incomes constant, that means about 31,000 to 33,000 paying households in 2040 and 38,000 to 42,000 in 2050, against about 25,000 with annual indexing.

Limit: Section 314 and the bill report call the adjustment annual, so the Department of Revenue could read section 316 differently, and the Legislature could fix it. The projection holds real incomes and population constant, assumes 2.5% inflation and approximates the income distribution near $1 million; it isolates the indexing rule and is not a forecast. Real income growth would add payers under any rule.

Verify: ESSB 6346, chapter 238, Laws of 2026 (session law) RCW 82.87.150, capital gains tax inflation adjustments Final Bill Report, ESSB 6346 (2026) 2026 General Election Voters' Pamphlet, Edition 9 (Pierce County): Initiative Measure IP26-645 Real value of the $1 million threshold at 2.5% inflation Paying households under the every-other-year adjustment vs annual indexing, 2028-2050 Washington income tax: 25,000 households and threshold drift WA revenue officials: Income tax will bring in more money than first expected (Aug. 27, 2026)

The millionaires tax's $1 million line loses value over timeProjected value, in 2026 dollars, of the $1 million standard deduction in Washington's millionaires tax under the law's every-other-year inflation adjustment, compared with adjusting every year, assuming 2.5% inflation.{"width":960,"height":540,"plot":{"left":90,"top":70,"right":926,"bottom":482},"yDomain":[700000,1000000],"series":[{"name":"As written (adjusted every other year)","color":"#176b87"},{"name":"If adjusted every year","color":"#b6542c"}],"points":[{"series":0,"x":90,"y":135.92,"xLabel":"2028","yLabel":"952,000"},{"series":1,"x":90,"y":135.92,"xLabel":"2028","yLabel":"952,000"},{"series":0,"x":128,"y":135.92,"xLabel":"2029","yLabel":"952,000"},{"series":1,"x":128,"y":135.92,"xLabel":"2029","yLabel":"952,000"},{"series":0,"x":166,"y":167.51,"xLabel":"2030","yLabel":"929,000"},{"series":1,"x":166,"y":135.92,"xLabel":"2030","yLabel":"952,000"},{"series":0,"x":204,"y":167.51,"xLabel":"2031","yLabel":"929,000"},{"series":1,"x":204,"y":135.92,"xLabel":"2031","yLabel":"952,000"},{"series":0,"x":242,"y":199.09,"xLabel":"2032","yLabel":"906,000"},{"series":1,"x":242,"y":135.92,"xLabel":"2032","yLabel":"952,000"},{"series":0,"x":280,"y":199.09,"xLabel":"2033","yLabel":"906,000"},{"series":1,"x":280,"y":137.29,"xLabel":"2033","yLabel":"951,000"},{"series":0,"x":318,"y":229.31,"xLabel":"2034","yLabel":"884,000"},{"series":1,"x":318,"y":135.92,"xLabel":"2034","yLabel":"952,000"},{"series":0,"x":356,"y":229.31,"xLabel":"2035","yLabel":"884,000"},{"series":1,"x":356,"y":135.92,"xLabel":"2035","yLabel":"952,000"},{"series":0,"x":394,"y":259.52,"xLabel":"2036","yLabel":"862,000"},{"series":1,"x":394,"y":137.29,"xLabel":"2036","yLabel":"951,000"},{"series":0,"x":432,"y":259.52,"xLabel":"2037","yLabel":"862,000"},{"series":1,"x":432,"y":135.92,"xLabel":"2037","yLabel":"952,000"},{"series":0,"x":470,"y":288.36,"xLabel":"2038","yLabel":"841,000"},{"series":1,"x":470,"y":135.92,"xLabel":"2038","yLabel":"952,000"},{"series":0,"x":508,"y":288.36,"xLabel":"2039","yLabel":"841,000"},{"series":1,"x":508,"y":135.92,"xLabel":"2039","yLabel":"952,000"},{"series":0,"x":546,"y":315.83,"xLabel":"2040","yLabel":"821,000"},{"series":1,"x":546,"y":135.92,"xLabel":"2040","yLabel":"952,000"},{"series":0,"x":584,"y":315.83,"xLabel":"2041","yLabel":"821,000"},{"series":1,"x":584,"y":135.92,"xLabel":"2041","yLabel":"952,000"},{"series":0,"x":622,"y":343.29,"xLabel":"2042","yLabel":"801,000"},{"series":1,"x":622,"y":135.92,"xLabel":"2042","yLabel":"952,000"},{"series":0,"x":660,"y":344.67,"xLabel":"2043","yLabel":"800,000"},{"series":1,"x":660,"y":135.92,"xLabel":"2043","yLabel":"952,000"},{"series":0,"x":698,"y":370.76,"xLabel":"2044","yLabel":"781,000"},{"series":1,"x":698,"y":135.92,"xLabel":"2044","yLabel":"952,000"},{"series":0,"x":736,"y":370.76,"xLabel":"2045","yLabel":"781,000"},{"series":1,"x":736,"y":135.92,"xLabel":"2045","yLabel":"952,000"},{"series":0,"x":774,"y":396.85,"xLabel":"2046","yLabel":"762,000"},{"series":1,"x":774,"y":135.92,"xLabel":"2046","yLabel":"952,000"},{"series":0,"x":812,"y":396.85,"xLabel":"2047","yLabel":"762,000"},{"series":1,"x":812,"y":135.92,"xLabel":"2047","yLabel":"952,000"},{"series":0,"x":850,"y":421.57,"xLabel":"2048","yLabel":"744,000"},{"series":1,"x":850,"y":135.92,"xLabel":"2048","yLabel":"952,000"},{"series":0,"x":888,"y":421.57,"xLabel":"2049","yLabel":"744,000"},{"series":1,"x":888,"y":135.92,"xLabel":"2049","yLabel":"952,000"},{"series":0,"x":926,"y":447.67,"xLabel":"2050","yLabel":"725,000"},{"series":1,"x":926,"y":135.92,"xLabel":"2050","yLabel":"952,000"}]}The millionaires tax's $1 million line loses value over time700,000750,000800,000850,000900,000950,0001,000,00020282031203420372041204420472050Tax yearAs written (adjusted every other year)If adjusted every yearProjection at 2.5% inflationFactHub · Threshold in 2026 dollars
Projected value of the $1 million threshold in 2026 dollars at 2.5% inflation. Both methods lose value before the first adjustment in 2029; after that, the law's every-other-year formula keeps losing ground. A projection, not observed data. View source chart
5. What stays out: home sales, real estate, family businesses, small amounts Statutory text of the capital gains exemptions the new tax adopts, with worked examples

The capital gains tax does not apply to 'All real estate transferred by deed', retirement-account assets or qualifying family-business sales, and the new tax removes those gains from its base. In our example, a household with $400,000 of wages that sells its home for a $1.5 million gain owes nothing under the new tax. Near the line the amounts are small: the two-earner couple at $1.1 million pays $9,900, 0.9% of its income.

Limit: These exemptions are ordinary statutes a later Legislature could change by simple majority. Ordinary depreciation recapture on equipment and pass-through business income are not exempt.

Verify: RCW 82.87.050, capital gains tax exemptions Ten illustrative households under the law as enacted

Common questions

“The Legislature, in section 1(9) of the bill: 'the millionaires' tax is estimated to affect only the wealthiest one-half of one percent of the households in this state.'”

Short answer: Understated: 0.66% to 0.79%

The bill's own payer estimates are higher than its sentence. The fiscal note's 21,000 paying households are 0.66% of Washington's 3,168,080 households, and the Department of Revenue's July 2026 revision to 25,000 is 0.79%; the half-percent figure matches tax returns better (0.57% of 2022 returns reported $1 million or more). The sentence also counts only the first year: the threshold's partial indexing raises the share over time.

“No on I-645, in the voters' pamphlet: 'The Millionaires Tax only applies to those making above one million dollars per year.'”

Short answer: Mostly true: per household, per year

Accurate for the year a household pays: no household owes the tax without more than $1 million of Washington income that year. It leaves out that 'those' means households, not earners, so two spouses below $1 million each can pay, and that a single year's spike, such as a retirement-account withdrawal, can put an ordinary household over the line once.

“Yes on I-645, in the voters' pamphlet: 'An income tax on anyone will become an income tax on everyone.'”

Short answer: A prediction; not rated

This is a prediction, which the evidence cannot settle yet. What the law itself does is narrower and checkable: the threshold loses about half of inflation's effect, so the number of paying households grows even if no one changes the law, by our estimate to about 31,000 to 33,000 by 2040. Whether lawmakers will lower the threshold is a separate question, covered by our fact check on whether they can do so without a public vote.

“The every-other-year adjustment is a drafting error the Department of Revenue will fix.”

Short answer: Possibly

Section 314 and the bill report call the adjustment annual, which supports a different reading, and the Legislature can amend section 316. But section 316's text names odd-numbered years and a 12-month change, the capital gains tax's own rule says 'each October thereafter', and as of October 21, 2026 the Department had issued no guidance.

“The tax will hit people who sell their home or a rental property.”

Short answer: No, real estate gains are exempt

Real estate gains are outside the base: the federal home-sale exclusion carries through, and the rest of any real estate gain is exempt from the capital gains tax and removed from the new tax's base. Ordinary depreciation recapture on personal property, such as equipment, is the exception.

Conclusion

The Legislature described the tax as limited to households with $1 million of income, and in a narrow sense that is accurate: no household owes it unless its Washington base income for the year exceeds the deduction. What the label hides is how a household gets there. First, the deduction belongs to the household, not the earner. Two spouses earning $550,000 each owe $9,900, while the same two people unmarried owe nothing; amendments to give each spouse a deduction failed 47-49 in the House and 20-29 in the Senate. Second, the base starts from federal adjusted gross income, so income that arrives once counts in full in the year it arrives: an RSU vest, a retired couple's 401(k) withdrawal, an heir's inherited IRA taken at once. A five-year averaging amendment failed 43-51, and an exclusion for non-cash equity pay failed 40-53. Third, by our reading of sections 205 and 302, long-term gains that the capital gains tax already reaches are added back into the base and then credited, so a stock sale can make wages below $1 million taxable. Fourth, section 316 adjusts the deduction only in odd-numbered years and by one year of inflation each time, while the capital gains tax deduction is adjusted every year; at 2.5% inflation the line is worth about $821,000 in today's dollars by 2040, and our projection, holding real incomes constant, is about 31,000 to 33,000 paying households by then instead of about 25,000. Against that, the law exempts home sales and all other real estate gains, family-business sales and retirement-account assets from the capital gains base, and the amounts owed just over the line are small: the two-earner couple pays 0.9% of its income. The counts of affected households are estimates; no public data identifies two-earner couples by each spouse's pay, and the Department of Revenue has issued no rules yet. A literal reading of section 316 could also be changed by the Department or the Legislature, since the bill report and section 314 call the adjustment annual. None of these points depends on predicting future legislation. They are in the text the Legislature passed, which is why we rate the claim True with high confidence.

How we checked

  1. Defined the claim as the finding: whether households without a $1 million earner can owe the tax under the law as enacted, and by which routes.
  2. Read the enacted session law, the Senate final bill report, the Attorney General's explanatory statement and the capital gains tax statutes it adopts (RCW 82.87.050 and .150).
  3. Pulled the recorded votes on 13 floor amendments from the Legislature's roll-call service and the amendments' official effect statements.
  4. Computed ten illustrative households from the statute and projected paying households under the indexing rule; the script and tables are in the FactHub dataset.
  5. Used IRS Statistics of Income state data for the income mix of Washington's top filers.
  6. Recorded limits for each item and labeled our own readings and calculations.

Editorial note: Scope: the law as enacted in March 2026 (signed March 30), as of October 21, 2026, before any Department of Revenue rules. The household examples and the payer projection are FactHub's own calculations from the statute, labeled as ours; the capital gains add-back reading and the projection are analysis, not official estimates. Joe Wallin of The Startup Law Blog first pointed out the every-other-year adjustment, the marriage penalty and the safe-harbor gap. Version 2 changes the rated claim from the Legislature's 'one-half of one percent' sentence (rated Misleading in version 1) to the finding itself, and moves material on the tax's relief, volatility and behavioral effects to companion fact checks.

Expert-review status

No external specialist review has been recorded.

Funding and conflicts

Funding: No external funding for this piece.

Ownership: Published by the FactHub Research Team.

Conflicts: None known.

Sources

Sources are labeled by kind, with what this fact check takes from each, so readers can check the evidence independently.

  1. Government Washington State Legislature, Senate Committee Services. Final Bill Report, ESSB 6346 (2026)

    Nonpartisan staff summary of the bill as passed.

    Reliability: Written by nonpartisan legislative staff; it summarizes but does not change the law. It describes the indexing as both annual and every second year.

    • Spouses and domestic partners share one $1 million deduction whether they file jointly or separately.

      What the source says
      First, a taxpayer may deduct from Washington base income a standard deduction of $1 million per individual, or in the case of spouses or domestic partners, their combined standard deduction is limited to $1 million, regardless of whether they file joint or separate returns.
      Summary, Determining Washington Taxable Income

    • The tax base starts from federal adjusted gross income.

      What the source says
      The determination of Washington taxable income starts with federal AGI
      Summary, Determining Washington Base Income

    • Long-term gains are removed, then gains subject to the capital gains tax and its deduction are added back.

      What the source says
      long-term capital gains: exclude all long-term capital gains and losses from federal AGI; add net long-term capital gains subject to Washington’s capital gains tax; add the Washington capital gains tax standard deduction
      Summary, Determining Washington Base Income

    • Capital gains tax paid is credited against the new tax.

      What the source says
      A tax credit is also available for any Washington capital gains tax paid on capital gains taxed under the bill.
      Summary, Credits

    • Qualifies: The bill report calls the adjustment annual and every second year in the same sentence.

      What the source says
      The standard deduction is adjusted annually for inflation beginning with taxes collected in 2030 and every second year thereafter.
      Summary, Determining Washington Taxable Income
  2. Government Washington State Legislature. ESSB 6346, chapter 238, Laws of 2026 (session law)

    The enacted text of the tax.

    Reliability: The law as signed March 30, 2026. Its intent section is the Legislature's own description of whom the tax affects.

    • Section 316 adjusts the deduction only in October of odd-numbered years, starting 2029.

      What the source says
      October 2029 and each October of an odd-numbered year thereafter
      Sec. 316(1), p. 13

    • Qualifies: The bill says the tax affects the top half percent of households.

      What the source says
      wealthiest one-half of one percent of the households in this state
      Sec. 1(9), p. 3
  3. Government Washington Secretary of State. 2026 General Election Voters' Pamphlet, Edition 9 (Pierce County): Initiative Measure IP26-645

    Official pamphlet with the Attorney General's explanatory statement and each campaign's statement and rebuttal.

    Reliability: The explanatory statement is written by the Attorney General's office and was reviewed in court in August 2026. The campaign statements are written by each side, and the Secretary of State does not check them.

    • The Attorney General's statement says a married couple shares a single deduction.

      What the source says
      couple or domestic partnership shares a single
      p. 10, Explanatory Statement, The Law As It Presently Exists

    • Qualifies: The Attorney General's statement says the deduction is increased for inflation, without saying the adjustment is partial.

      What the source says
      in 2029, the $1,000,000 standard deduction is increased
      p. 10, Explanatory Statement, The Law As It Presently Exists

    • Qualifies: The No campaign's rebuttal says the tax applies only to those making over $1 million a year.

      What the source says
      The Millionaires Tax only applies to those making above one
      p. 11, Rebuttal of argument for · No on I-645 campaign (Janie White, Matt Hipp and others)

    • Qualifies: The Yes campaign's rebuttal predicts the tax will spread to everyone.

      What the source says
      An income tax on anyone will become an income tax on everyone.
      p. 11, Rebuttal of argument against · Yes on I-645 campaign (Sen. Chris Gildon, Jesse Proudman and others)
  4. Government Washington State Legislature. RCW 82.87.150, capital gains tax inflation adjustments

    The capital gains tax's indexing rule, which uses the same CPI formula every year.

    Reliability: Codified statute; the comparison shows the Legislature indexes its other high-income tax annually.

    • The capital gains tax deduction is adjusted every October with the same formula.

      What the source says
      Beginning October 2025 and each October thereafter, the department must adjust the applicable amounts
      Subsection (1)
  5. Government Washington State Legislature. RCW 82.87.050, capital gains tax exemptions

    Sales exempt from the capital gains tax, which the new tax also keeps out of its base.

    Reliability: Codified statute; ESSB 6346 section 302 cross-references it.

    • Qualifies: All real estate sales are exempt from the capital gains tax.

      What the source says
      All real estate transferred by deed, real estate contract, judgment, or other lawful instruments that transfer title to real property
      Subsection (1)
  6. Government Washington State Legislature. Amendment 6346-S.E AMH WALE TAYT 601 (Rep. Walen)

    House floor amendment to give each spouse a $1 million deduction.

    Reliability: Official amendment text with its staff-written effect statement.

    • The Walen amendment would have given couples a combined $2 million deduction.

      What the source says
      Applies the $1,000,000 standard deduction to the individual, not the household, resulting in a combined standard deduction of $2,000,000
      EFFECT
  7. Government Washington State Legislature. Amendment 6346-S.E AMH KLIC REIN 502 (Rep. Klicker)

    House floor amendment to average income over five years.

    Reliability: Official amendment text with its staff-written effect statement.

    • The Klicker amendment would have based the tax on five-year average income.

      What the source says
      Modifies the definition of "Washington taxable income" to be based on a five-year average of such income
      EFFECT
  8. Government Washington State Legislature. Amendment 6346-S.E AMH STOK TAYT 587 (Rep. Stokesbary)

    House floor amendment to exclude non-cash equity compensation.

    Reliability: Official amendment text with its staff-written effect statement.

    • The Stokesbary amendment would have excluded non-cash equity pay such as vesting stock.

      What the source says
      Excludes non-cash value of qualified equity compensation received by an individual from a qualified employer.
      EFFECT
  9. Other Joe Wallin, The Startup Law Blog. Washington's 9.9% Income Tax: The Marriage Penalty in ESSB 6346 (and How to Plan)

    A Seattle startup lawyer's analysis of the shared deduction.

    Reliability: Written by a practicing tax and startup lawyer whose firm offers planning for the tax; not affiliated with either campaign.

    • A tax lawyer reads the law the same way: one deduction for both spouses, creating a marriage penalty.

      What the source says
      gives spouses one $1 million standard deduction between them, not one each
      Introduction
  10. Other Joe Wallin, The Startup Law Blog. Washington's Income Tax Has No Prior-Year Safe Harbor for First-Time Filers

    Analysis of the estimated-tax rules for people who owe the tax for the first time.

    Reliability: Written by a practicing tax and startup lawyer whose firm offers planning for the tax; a reading of the statute, not an official interpretation.

    • First-time payers in a one-time income year may face estimated-tax penalties even if they pay in full on time.

      What the source says
      A founder or early employee in an exit year can pay the entire tax with a timely filed return and still face a penalty.
      Introduction
  11. Other Joe Wallin, The Startup Law Blog. Washington income tax: 25,000 households and threshold drift

    First public analysis of the every-other-year adjustment.

    Reliability: Written by a practicing tax and startup lawyer whose firm offers planning for the tax; he notes the statute's conflicting language.

    • A tax lawyer reads section 316 as capturing about one year of inflation every two years.

      What the source says
      Our reading is that later adjustments occur every other year and capture only about one year of inflation.
      Inflation adjustment section
  12. News report Washington State Standard (via The Inlander). WA revenue officials: Income tax will bring in more money than first expected (Aug. 27, 2026)

    News report of the Department of Revenue's revised payer estimate.

    Reliability: Nonprofit state news outlet reporting a Department of Revenue analysis that was not in the voter fiscal statement.

    • The Department of Revenue estimates 25,000 paying households, up from 21,000.

      What the source says
      The Department of Revenue analysis also found that 25,000 households would pay the income tax, up from 21,000 discussed during the last legislative session.
      Paragraph on household estimates
  13. FactHub record FactHub. Ten illustrative households under the law as enacted

    FactHub's worked examples computed from the statute.

    • A married couple earning $550,000 each owes $9,900; the same two people unmarried owe nothing.

    • A $900,000 RSU vest on a $250,000 salary, or a retired couple's $1 million 401(k) withdrawal, costs $14,850; an heir with $200,000 of other income who takes a $4 million inherited IRA at once owes $316,800, but nothing if it is spread over 10 years.

    • A $600,000 stock gain makes $800,000 of wages taxable, adding $17,060 of new tax on top of $22,540 of capital gains tax.

    • Qualifies: A household with $400,000 of wages that sells its home for a $1.5 million gain owes no new tax.

  14. FactHub record FactHub. Floor amendments on couples, one-time income, retirement income and expansion, with votes

    Recorded votes on 13 floor amendments, from the Legislature's roll-call service.

    • Amendments for $1 million per spouse and $1.5 million per couple failed 47-49 in the House; $2 million for joint filers failed 20-29 in the Senate.

    • The five-year averaging amendment failed 43-51 and the equity-pay exclusion failed 40-53.

  15. FactHub record FactHub. Paying households under the every-other-year adjustment vs annual indexing, 2028-2050

    FactHub's projection of paying households, holding real incomes constant.

    • At 2.5% inflation with real incomes constant, about 31,000-33,000 households pay in 2040 and 38,000-42,000 in 2050, versus about 25,000 with annual indexing.

  16. FactHub record FactHub. What Washington's $1 million-plus returns reported, 2022

    IRS Statistics of Income figures for Washington's top filers.

    • Qualifies: 18,180 of 21,530 Washington returns with $1 million or more of income in 2022 (84%) were joint returns.

  17. FactHub record FactHub. Real value of the $1 million threshold at 2.5% inflation

    FactHub's projection of the threshold under section 316 and under annual indexing.

    • At 2.5% inflation the threshold is worth $952,000 in 2026 dollars in 2028, $821,000 in 2040 and $725,000 in 2050; annual indexing would hold it near $952,000.

  18. FactHub record FactHub. Share of Washington households expected to pay

    Official payer estimates divided by the Census household count.

    • 21,000 and 25,000 paying households are 0.66% and 0.79% of Washington's 3,168,080 households.

  19. FactHub dataset Washington millionaires tax: income mix of top filers, floor amendment votes, worked household examples and payer projection

    • Tables: household-examples

      Analysis household-examples

    • Tables: amendment-votes

      Analysis amendment-votes

    • Tables: payer-projection

      Analysis payer-projection

    • Tables: irs-top-returns

      Analysis income-mix-1m-2022

  20. FactHub dataset Washington millionaires tax: who files over $1 million, how the threshold holds up, and how volatile the base is

    • Tables: threshold-real-value

      Analysis threshold-real-2-5

    • Tables: paying-households

      Analysis paying-household-share

  21. FactHub chart wa-millionaires-tax-threshold-real-value

Update history

  1. New main photo; disclosure updated.
  2. Shows the arithmetic for the worked examples, including the heir's $200,000 of other income in the inherited-IRA example; the summary now names all four routes the conclusion discusses; dates updated.
  3. Editorial note corrected: the law was enacted in March 2026 (signed March 30), and the article reflects it as of October 21, 2026 (First Look feedback 2516095947271457787-c084580a1d652264a09578c6ce7901d3).
  4. Version 2 (drafts 2-3): rates the finding (households without a $1 million earner can owe the tax) instead of the bill's 'one-half of one percent' sentence, which moves to Common questions. Adds couples, one-time income, capital gains stacking and amendment votes, a new FactHub dataset, and payer projections. Removes relief, volatility and behavioral-response sections, now covered by companion fact checks, and removes the version 1 statement that no legislator had proposed lowering the threshold, which is no longer accurate. Converts sources to quoted takeaways. Draft 3 cites the current versions of the datasets and threshold chart.
  5. First version.

Cited by

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  • Briefing wa-i-645 — version 6 (published) cites version 6
  • Briefing wa-i-645 — version 4 (published) cites version 5

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{"@context":"https://schema.org","@type":"ClaimReview","url":"https://facthub.org/n/article/wa-millionaires-tax-who-it-affects/6","datePublished":"2026-10-22","dateModified":"2026-10-22","author":{"@type":"Organization","name":"FactHub","url":"https://facthub.org/"},"claimReviewed":"Washington\u0027s millionaires tax can reach households where no one earns $1 million a year: couples share one deduction, one-time income counts in full, and the threshold keeps up with only about half of inflation.","reviewRating":{"@type":"Rating","alternateName":"True"},"image":"https://facthub.org/node-assets-v2/article/wa-millionaires-tax-who-it-affects/6/kirkland-houses/social-1200x630.jpg"}

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Technical details: node handle article:wa-millionaires-tax-who-it-affects:6