Washington's capital gains tax does not apply to the sale of real estate. The Department of Revenue lists real estate as exempt, in those words. If you are selling a house in Washington, the state's 7% capital gains tax is not your problem.
That single fact resolves the question most Washington sellers are actually asking, and it is the opposite of what many of them assume. The tax passed in 2021, it was contested loudly and publicly, and a great many homeowners came away believing their home sale was about to be taxed at 7%. It isn't.
What you may owe is federal capital gains tax, and what you will almost certainly pay is Washington's real estate excise tax, a different tax entirely, on the sale price rather than the gain. This guide separates the three.
KEY TAKEAWAYS
- Washington's capital gains tax exempts real estate confirmed by the Department of Revenue.
- Federal capital gains tax still applies, but the primary-residence exclusion shelters $250,000 of gain for single filers and $500,000 for married couples filing jointly.
- Washington's real estate excise tax is the tax sellers actually pay graduated from 1.10% to 3.00%, plus a local rate.
- Investors selling non-primary property have neither exclusion and should look at a 1031 exchange.
Does Washington's capital gains tax apply when I sell my house?
No. The Washington Department of Revenue lists real estate among the assets exempt from the state capital gains tax. The exemption also covers interests in privately held entities, to the extent the gain is directly attributable to real estate owned by that entity.
For completeness, here is the tax you are not paying. Washington's capital gains tax applies to long-term gains on assets like stocks and business interests, above a standard deduction of $278,000 for 2025. Under ESSB 5813, effective for tax year 2025, it is tiered: 7% on taxable gains up to $1 million, and an additional 2.9% above that, for a top rate of 9.9%.
None of it reaches your home sale.
What about federal capital gains tax?
This one does apply, and it's the one worth planning around.
The IRS taxes the gain on the sale of a home sale price minus your original purchase price, minus qualifying improvements, minus selling costs like commission and excise tax. But for a primary residence, IRS Publication 523 provides an exclusion large enough that many home sales produce no federal tax at all:
| FILING STATUS | GAIN EXCLUDED |
|---|---|
| Single | $250,000 |
| Married filing jointly | $500,000 |
To qualify, you must meet both tests within the five years before the sale:
- Ownership you owned the home at least 24 months
- Residence you lived in it as your main home at least 24 months
The two periods don't have to be the same 24 months. For married couples, only one spouse needs to meet the ownership test, but each spouse must meet the residence test to claim the full $500,000.
There's also a look-back rule: the exclusion can be claimed once in any two-year period. Sell two homes inside two years, and only one of them qualifies.
The practical consequence for a Seattle-area seller: a couple who bought at $600,000 and sells at $1,050,000 has a $450,000 gain before costs, which sits inside the $500,000 exclusion. They owe no federal capital gains tax on it. Long-tenured owners in appreciated neighborhoods are the ones who need to run the numbers carefully a home held twenty-five years can exceed the exclusion.
How do you calculate the gain in the first place?
Your gain is not your sale price minus what you paid. Two adjustments sit in between, and both work in your favour.
Adjusted basis is your purchase price plus qualifying capital improvements a new roof, an addition, a kitchen remodel. Routine repairs and maintenance don't count. Amount realized is your sale price minus selling costs, which include brokerage commission and the excise tax you paid.
Gain is the second minus the first. A worked example, for a couple filing jointly who bought in Seattle years ago:
| STEP | FIGURE |
|---|---|
| Sale price | $1,400,000 |
| Less commission at 5% | −$70,000 |
| Less excise tax (King County) | −$23,975 |
| Amount realized | $1,306,025 |
| Purchase price | $525,000 |
| Plus capital improvements | +$85,000 |
| Adjusted basis | $610,000 |
| Gain | $696,025 |
| Less married-filing-jointly exclusion | −$500,000 |
| Federally taxable gain | $196,025 |
Two things to take from that. First, the selling costs did real work commission and excise tax together removed nearly $94,000 from the gain before the exclusion was even applied. Second, this couple exceeds the exclusion, which is exactly the situation long-tenured owners in appreciated Seattle and Eastside neighborhoods find themselves in.
Keep your improvement receipts. Capital improvements raise your basis and lower your gain, and the burden of proving them is yours. Twenty years of undocumented remodels are worth nothing at closing.
What tax do Washington sellers actually pay?
The real estate excise tax, unlike the two above it is charged on the entire sale price, not on your gain. Whether you made money on the sale is irrelevant to it.
Per the Department of Revenue, the state portion is graduated at rates effective 1 January 2023:
| PORTION OF SALE PRICE | STATE RATE |
|---|---|
| $525,000 or less | 1.10% |
| $525,000.01 – $1,525,000 | 1.28% |
| $1,525,000.01 – $3,025,000 | 2.75% |
| $3,025,000.01 and above | 3.00% |
Your city adds a local rate on the full price 0.50% throughout King County, per the DOR's local rate sheet effective 1 March 2026.
On an $890,000 Seattle sale that comes to $14,902. On a $1,300,000 Kirkland sale, $22,200.
So the honest summary of a Washington home sale: no state capital gains tax, probably no federal capital gains tax if it's your primary residence and your gain is inside the exclusion, and a five-figure excise tax bill regardless.
What if it's an investment property, not my home?
Different answer, and a worse one.
The primary-residence exclusion requires you to have lived in the property. A rental or investment property doesn't qualify, so the full federal gain is exposed. Depreciation you claimed over the years is also recaptured, which surprises investors who budgeted only for capital gains.
The standard tool here is a 1031 exchange, deferring the federal gain by rolling proceeds into a like-kind investment property, within strict deadlines. Washington's real estate exemption still means no state capital gains tax, and the excise tax still applies to the sale.
1031 exchanges are unforgiving on timing and on how funds are held. If you're considering one, involve a qualified intermediary and your CPA before you list, not after you have an offer.
Frequently Asked Questions
Do I pay capital gains tax when I sell my house in Washington State?
Not to Washington. The state's capital gains tax exempts real estate, per the Department of Revenue. You may owe federal capital gains tax, though the primary-residence exclusion shelters $250,000 of gain for single filers and $500,000 for married couples filing jointly who meet the ownership and residence tests.
What is the Washington capital gains tax rate?
For tax year 2025 it is tiered: 7% on taxable gains up to $1 million above the standard deduction, plus an additional 2.9% above $1 million, for a top rate of 9.9%. The 2025 standard deduction is $278,000. None of this applies to real estate, which is exempt.
How do I avoid capital gains tax on a home sale in Washington?
For a primary residence, the federal exclusion usually does it meet the 24-month ownership and 24-month residence tests within the five years before sale, and $250,000 single or $500,000 married is excluded. There is no state capital gains tax on real estate to avoid. Investors typically use a 1031 exchange to defer federal gain.
Is Washington's real estate excise tax the same as capital gains tax?
No. Confusing the two is a common and expensive error. Capital gains tax applies to profit and exempts real estate. Real estate excise tax applies to the full sale price regardless of profit, is graduated from 1.10% to 3.00% at state level plus a local rate, and is paid by the seller at closing.
How long do I have to live in a house to avoid capital gains in Washington?
For the federal exclusion, at least 24 months of residence and 24 months of ownership within the five years before the sale, and you can claim the exclusion only once in any two-year period. Washington imposes no state capital gains tax on real estate at any holding period.
Selling and want the real numbers before you list? Excise tax and net proceeds can be calculated exactly in advance.
Sources
This article is general information, not tax advice. Tax outcomes depend on facts specific to you. Consult a CPA or qualified tax professional before acting.
• Washington State Department of Revenue, Capital gains tax, retrieved directly 2026-08-22, https://dor.wa.gov/taxes-rates/other-taxes/capital-gains-tax
• Washington State Department of Revenue, New tiered rates for Washington's capital gains tax, retrieved directly 2026-08-22, https://dor.wa.gov/forms-publications/publications-subject/special-notices/new-tiered-rates-washingtons-capital-gains-tax
• Washington State Department of Revenue, Real estate excise tax, retrieved directly 2026-08-22, https://dor.wa.gov/taxes-rates/other-taxes/real-estate-excise-tax
• Washington State Department of Revenue, Local Real Estate Excise Tax Rates, effective March 1, 2026, retrieved directly 2026-08-22, https://dor.wa.gov/sites/default/files/2026-01/84-0013-Mar26_REET.pdf
• Internal Revenue Service, Publication 523, Selling Your Home, retrieved directly 2026-08-22, https://www.irs.gov/publications/p523
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