Capital Gains When Selling Your Seattle Home: What Actually Applies

Capital gains is the tax question I hear most from people selling a home in Washington state, usually asked with dread, because a Seattle house bought fifteen or twenty years ago has often doubled in value. The honest answer is better than most sellers expect and more nuanced than the internet lets on. Here is what actually applies: the state tax that does not touch your sale, the federal exclusion that shields most of them, how gain is really calculated, and where long-time owners can still owe.

Start With the Tax That Does Not Apply

Washington has no state income tax, and the capital gains excise tax the state added in 2022 does not reach your house. Chapter 82.87 RCW exempts sales of real estate outright: any gain, any property, whether or not you lived in it. People regularly ask me whether the "7% Washington capital gains tax" hits a home sale, and the answer is no, and it never has.

What Washington does collect at closing is the real estate excise tax, which is a different animal. It is a transfer tax on the sale price, paid whether you made money or not, and it is one of the larger line items in the closing costs my guide to selling a home in Seattle walks through. Keep the two separate in your head: excise tax is a cost of selling, and it actually reduces your capital gain, as covered below.

So the only capital gains tax in play on a Washington home sale is federal. That is where the rest of this article lives.

The Federal Exclusion Most Sellers Never Exceed

Section 121 of the tax code lets you exclude up to $250,000 of gain on the sale of your main home, or $500,000 if you are married and file jointly. Three conditions:

• 01You owned the home for at least two years out of the five ending on the sale date.
• 02You lived in it as your main home for at least two of those five years. The two years do not have to be continuous, and they do not have to be the same two years as the ownership test.
• 03You have not excluded gain on another home sale in the two years before this one.

For a married couple, both spouses have to meet the use test but only one needs to meet the ownership test. And the exclusion is not a one-time thing. You can use it again on your next home, and the one after that, as long as two years pass between sales.

The practical result is that most Seattle sellers owe nothing. If you bought in the last decade, or you are a couple with a gain under half a million dollars, the exclusion covers you and there is nothing to pay and often nothing to report. The sellers who need to plan are the ones who bought in the 1990s or early 2000s, or single owners of homes that have appreciated a lot, and the neighborhoods I work in have plenty of both.

How Much Gain You Actually Have

The mistake nearly everyone makes is subtracting what they paid from what they sold for and calling that the gain. Real gain is smaller, sometimes a lot smaller, because both ends of the calculation move in your favor.

Your basis starts with the purchase price plus most of the closing costs you paid to buy. It then grows with every capital improvement over the years: a new roof, a remodeled kitchen, a finished basement, a sewer line replacement, an addition, a new furnace. Repairs and maintenance do not count, but anything that added value or extended the life of the house does, and twenty years of ownership usually adds up to more than people remember.

On the sale side, you do not start from the contract price. You subtract the costs of selling: commissions, the excise tax, title and escrow fees, and any seller credits. What is left is the amount realized, and your gain is that number minus your adjusted basis. An illustration, with round numbers:

A married couple in that example excludes the entire gain and owes nothing. A single owner excludes $250,000 and has $215,000 of taxable gain. Notice how much work the basis did: the naive version of that calculation says $600,000 of profit, and the real one says $465,000.

This is why records matter, and why I tell every long-time owner to start digging before they list. Closing statements from the purchase, receipts and contracts for improvements, permit records if the receipts are long gone. Every dollar of improvement you can document is a dollar of gain you do not pay tax on.

When Long-Time Seattle Owners Exceed It

Gain above the exclusion is taxed as long-term capital gain, and the rate depends on your total taxable income for the year of the sale, with the gain itself counted in. For 2026 the brackets are:

Most sellers with taxable gain land in the 15% bracket. In the single-owner example above, $215,000 of taxable gain at 15% is roughly $32,000 in federal tax on a million-dollar sale, which is real money but a long way from the six-figure bill people picture. Two additions can raise it: the 3.8% net investment income tax applies once modified adjusted gross income passes $200,000 for single filers or $250,000 for joint filers, and a large gain can push part of itself into the 20% bracket. Both are reasons to run the actual numbers with a CPA before you commit to a closing date, not after.

One quirk worth knowing: because the gain counts toward the income that sets your bracket, the year you sell matters. A retiree with modest income who sells in a year with no other big income events may pay far less on the same gain than someone who sells in the year of a large bonus or a stock sale.

Situations That Change the Math

You moved out and rented it

The exclusion still works if you lived there for two of the last five years, so a house you rented out for up to three years after moving on can usually still qualify. Two adjustments apply. The depreciation you claimed, or could have claimed, while it was a rental is taxed on sale at up to 25% and cannot be excluded. And time the house spent as something other than your residence after 2008 can reduce the exclusion proportionally. Past the five-year window, the exclusion is gone entirely, and the sale is taxed like any investment property; at that point a 1031 exchange, which is never available for a primary residence, becomes an option.

A spouse has died

A surviving spouse can still use the full $500,000 exclusion if the sale closes within two years of the death and the couple qualified before it. Washington is a community property state, which adds a second, larger benefit: both halves of a community property home step up to market value at the first death, not just the half that transferred. For many widowed sellers that step-up erases most of the gain before the exclusion is even applied. The same step-up is what makes taxes on an inherited house so manageable, which my guide to selling an inherited house in Washington covers in detail.

You are selling before two years are up

If the reason is a job change, a health issue, or an unforeseen circumstance such as a divorce, a death, a natural disaster, or a multiple birth, you get a partial exclusion prorated by the fraction of the two years you completed. A year of ownership and use, for example, gives a single seller a $125,000 exclusion. A voluntary early sale gets no exclusion, and a sale inside one year of purchase is a short-term gain taxed at ordinary income rates.

Part of the house was a business or a rental

A home office you deducted, or the rented half of a duplex, gets the same depreciation recapture treatment as a rental. Whether the rest of the exclusion is affected depends on whether the business portion was within the same dwelling or a separate structure. It is one of the places where a good CPA earns the fee.

You are divorcing

Ownership and use by a former spouse under a divorce decree can count toward your own tests, and a spouse who moves out while the other stays does not automatically lose the exclusion. Get the sale, or the transfer between spouses, structured before the decree is final rather than after.

What Might Change

Congress has been talking about this exclusion for two years. One bipartisan bill would double it to $500,000 for single filers and $1 million for couples and index it to inflation, and it has picked up broad cosponsor support. Another would eliminate the tax on primary residence sales entirely. As of this writing, neither has passed either chamber, and the rules above are the rules in force. If that changes I will update this page. What I would not do is hold a sale you otherwise want to make on the hope that a bill passes; the market timing question is hard enough without adding Congress to it.

What to Do Before You List

• 01Pull the purchase closing statement and build the improvements list, with receipts where you have them and permit records where you do not. Do this first, because it can take weeks and it changes every other number.
• 02Rough out the gain using the two tables above. If it is clearly under the exclusion, you can stop worrying and focus on the sale.
• 03If it is close or over, have a CPA run the real calculation before you pick a closing date. The year of sale, the improvements you can document, and the timing of any other income that year all move the result.
• 04Get the house valued honestly. A gain estimate built on an online estimate is a guess on top of a guess, and my guide to what your Seattle home is worth covers why those numbers miss.

The Bottom Line

Selling a home in Washington is one of the more tax-friendly things you can do with a large asset: no state tax on the gain, a federal exclusion that covers most sales in full, and a basis calculation that shrinks whatever is left. The owners who actually owe are the ones who have held the longest and gained the most, and for them the job is documentation and timing, not avoidance.

I am a broker, not a tax advisor, and the numbers in your situation belong with a CPA. What I can do is give you the other half of the equation: an honest number for the house, a realistic estimate of the costs of selling, and a plan for the timing. My free Seller Guide covers pricing, prep, and the selling timeline, or tell me about the house and when you are thinking of selling and I will walk you through it. Free, no obligation, and a straight answer either way.