Washington Standard Deduction Guide – Washington state residents enjoy one of the most tax-friendly environments in the U.S. because the state does not impose a personal or corporate income tax. However, you still file a federal tax return and may owe Washington’s capital gains excise tax if your long-term gains exceed the state’s standard deduction. This comprehensive guide explains everything you need to know about the Washington standard deduction—both the federal amounts that apply to every Washington taxpayer and the state-specific deduction for capital gains tax. All figures are current as of April 2026 for tax years 2025 and 2026.
What Is the Standard Deduction and Why It Matters in Washington
The standard deduction is a fixed dollar amount that reduces your taxable income. You can take it instead of itemizing deductions such as mortgage interest, medical expenses, or charitable contributions. In Washington, the standard deduction has two layers:
- Federal standard deduction (claimed on your Form 1040) — applies to all U.S. taxpayers, including Washington residents.
- Washington capital gains tax standard deduction — a state-specific deduction that shields the first $278,000 (2025) of long-term capital gains from Washington’s excise tax.
Because Washington has no state income tax, most residents only deal with the federal deduction unless they have significant long-term capital gains from stocks, real estate, or business sales.
Federal Standard Deduction Amounts for Washington Residents (2025 & 2026)
The IRS adjusts the federal standard deduction annually for inflation. Thanks to the One Big Beautiful Bill Act (OBBBA) of 2025, amounts received a permanent boost.
Tax Year 2025 (returns filed in 2026)
- Single or Married Filing Separately: $15,750
- Married Filing Jointly or Qualifying Surviving Spouse: $31,500
- Head of Household: $23,625
Tax Year 2026 (returns filed in 2027)
- Single or Married Filing Separately: $16,100
- Married Filing Jointly or Qualifying Surviving Spouse: $32,200
- Head of Household: $24,150
Additional federal standard deduction for age 65+ or blindness (2025)
- $1,600 per qualifying condition (age or blindness).
- If you are unmarried (not a surviving spouse) and qualify for both, the amount increases to $2,000 per condition.
New enhanced senior deduction (2025–2028) Taxpayers age 65 or older get an extra $6,000 deduction per person ($12,000 for married couples if both qualify). This is available whether you take the standard deduction or itemize. It phases out for modified AGI over $75,000 (single) or $150,000 (joint).
Washington Capital Gains Tax Standard Deduction Explained
Washington imposes a 7%–9.9% excise tax on long-term capital gains allocated to the state. The standard deduction reduces the amount subject to tax.
2025 Standard Deduction: $278,000
(Up from $270,000 in 2024. The amount is adjusted annually for inflation by the Washington Department of Revenue.)
How the tax works after the deduction:
- Gains up to the standard deduction → $0 Washington tax.
- Next portion up to $1 million of taxable gain → 7%.
- Gains above $1 million → 9.9%.
Additional Washington deductions available (2025)
- Long-term capital gain from the sale of a qualified family-owned small business (full exclusion in many cases).
- Charitable donations exceeding the standard deduction (capped at $111,000 for 2025).
The deduction applies per individual, married couple, or domestic partnership—not doubled for married filing separately.
Important: This is not a deduction on your federal return. It only reduces Washington capital gains excise tax. You still report the full gain on your federal Form 1040 and may owe federal capital gains tax (0%, 15%, or 20% + 3.8% NIIT).
Who Should Take the Standard Deduction vs. Itemize in Washington?
Take the standard deduction if:
- Your itemized deductions (mortgage interest, state sales tax, medical expenses, etc.) are below the federal standard amount.
- You have simple finances and want the easiest filing.
- You are a senior 65+ claiming the new $6,000 enhanced deduction.
Itemize if:
- You own a high-value home with large mortgage interest.
- You paid significant Washington sales tax (you can deduct state and local sales tax instead of income tax on your federal return).
- You have large medical expenses or charitable contributions.
Pro tip for Washington residents: Because there is no state income tax, you can deduct state and local general sales taxes on your federal Schedule A if you itemize—often a better choice than in income-tax states.
How to Claim the Standard Deduction on Your Taxes?
Federal return (Form 1040):
- Check the appropriate box on line 12 of Form 1040.
- Enter the amount from the IRS table (or use tax software).
- Seniors automatically receive the additional and enhanced deductions through tax software or Form 1040 instructions.
Washington capital gains tax:
- File Form 84-100 (Capital Gains Excise Tax Return) with the Washington DOR if your gains exceed the standard deduction.
- The deduction is applied automatically on the form.
- Due date: April 15 (or next business day) following the tax year.
Most tax software (TurboTax, H&R Block, TaxAct) automatically handles both federal and Washington capital gains calculations for state residents.
Common Mistakes Washington Taxpayers Make
- Forgetting to report Washington capital gains even if under the $278,000 deduction (you may still need to file if required).
- Missing the new $6,000 senior enhanced deduction.
- Confusing the federal standard deduction with the Washington capital gains deduction.
- Not adjusting for inflation—amounts change every year.
- Failing to track the $1 million threshold for the higher 9.9% rate on capital gains.
Upcoming Changes: Millionaires Tax and $1 Million Standard Deduction
In March 2026, Washington lawmakers passed a new “millionaires tax” (9.9% on income over $1 million) with a $1,000,000 standard deduction (indexed for inflation). This takes effect January 1, 2028. It does not replace the capital gains tax but provides a credit for capital gains taxes already paid.
Until 2028, Washington remains a no-income-tax state for wages, salaries, and most ordinary income.
Washington Standard Deduction Resources
- IRS Standard Deduction Tool → irs.gov
- Washington DOR Capital Gains Tax Page → dor.wa.gov/taxes-rates/other-taxes/capital-gains-tax
- Form 84-100 Instructions → Available on the DOR website
- Free filing options: IRS Free File, Washington DOR resources for capital gains
Frequently Asked Questions About the Washington Standard Deduction
Is there a Washington state income tax standard deduction?
No. Washington has no personal income tax, so there is no state-level standard deduction for ordinary income.
Does the capital gains standard deduction change every year?
Yes—it is inflation-adjusted annually by the Department of Revenue. The 2025 amount is $278,000.
Can married couples double the capital gains deduction?
No. The $278,000 deduction is per individual, couple, or domestic partnership.
Do seniors in Washington get extra breaks?
Yes—both the regular additional standard deduction and the new $6,000 federal enhanced senior deduction for 2025–2028.
Should I itemize or take the standard deduction?
Run the numbers in tax software. For most Washington residents with modest itemized expenses, the standard deduction saves more time and money.
Stay up to date by checking IRS.gov and dor.wa.gov each fall for inflation adjustments. If you have significant capital gains or are age 65+, consult a tax professional familiar with Washington’s unique rules to maximize every deduction available to you.