Capital Gains Tax on a Home Sale When Your Gain Is Over the Exclusion

Who qualifies for the exclusion, and how much it covers

Under IRC 121, you exclude gain on the sale of your principal residence if, during the five years ending on the sale date, you owned it for at least two years and used it as your main home for at least two years. The two years do not need to be consecutive, and ownership and use do not need to overlap. You cannot have used the exclusion on another home in the two years before this sale (IRC 121(b)(3)).

The cap is $250,000 per person. Married couples filing jointly get $500,000 if either spouse meets the ownership test, both meet the use test, and neither used the exclusion in the prior two years (IRC 121(b)(2)). These amounts were set in 1997 and are not indexed for inflation, which is why so many long-time owners in coastal markets now have gain above them. Excluded gain is simply left out of income: it is not reported as tax owed, and it does not count toward the 3.8% tax.

How the gain above the exclusion is taxed

Start with the amount realized (price minus commissions and other selling costs), subtract adjusted basis (purchase price, purchase closing costs and capital improvements), then subtract the exclusion. What remains is long-term capital gain if you owned the home more than a year. Federal rates are 0%, 15% or 20%, with 20% above $613,700 of taxable income for joint filers (Rev. Proc. 2025-32, 2026); the capital gains hub has the full table.

Because the excluded part is not in taxable income, the taxable gain stacks on top of your other income. In the first example, the federal income tax caused by the sale is $170,785 and the 3.8% net investment income tax adds $34,200. A residence is not a trade or business asset, so the taxable gain is net investment income once modified AGI exceeds $250,000 joint or $200,000 single (IRC 1411, fixed thresholds, 2026). The NIIT on a sale analysis shows how timing can limit it.

Basis is where most owners leave money behind. Thirty years of kitchens, roofs, additions, solar and landscaping add up, and each documented dollar reduces gain above the exclusion one for one. See adjusted basis for what counts.

The state layer: California vs Texas

Most states follow the federal exclusion and then tax the gain above it as ordinary income. California has no lower rate for capital gains, so the taxable part is taxed at up to 12.3%, plus 1% on income over $1 million (California FTB, 2026). Texas has no personal income tax. Same couple, same house economics: the California version costs $296,498, the Texas version $204,985, a state gap of $91,513.

Moving before you sell does not help much with a house: the state where the home sits taxes the gain as its own source income. Planning a move for other reasons? Read the residency change analysis and the California page first.

Widows and widowers: the two-year $500,000 window

A surviving spouse who has not remarried keeps the $500,000 cap if the home is sold within two years after the spouse's death and the joint-filer requirements were met immediately before the death (IRC 121(b)(4), in effect since 2008). After the second anniversary, the cap falls to $250,000.

The death also changes the gain itself. Property included in the deceased spouse's estate gets a basis equal to its value at death (IRC 1014). For a jointly owned home in a common-law state that is usually half the house; in community property states such as California, both halves can be stepped up under IRC 1014(b)(6). In our examples the widow's gain is $750,000 after that step-up. Selling within two years costs $67,210; waiting into year three costs $150,297, a difference of $83,087 from the calendar alone.

Sold before two years? The partial exclusion

If you sell before meeting the two-year tests because of a change in place of employment, health, or unforeseen circumstances, you get a reduced cap rather than none (IRC 121(c)). The regulations multiply the full $250,000 or $500,000 by the qualifying months divided by 24 (Treas. Reg. 1.121-3(g)). Example 1 in that regulation: 12 months, a job move, a $125,000 cap for a single owner.

The regulation's safe harbors for unforeseen circumstances include involuntary conversion of the home, a disaster or casualty to it, and for you or a household member: death, unemployment, a change in employment that leaves you unable to pay housing costs, divorce or legal separation, and multiple births from one pregnancy (Treas. Reg. 1.121-3(e), current). A sale driven by wanting a nicer house or a better financial position does not qualify.

Depreciation and the home office

Depreciation you claimed (or could have claimed) after May 6, 1997 is never excluded (IRC 121(d)(6)). It comes back as unrecaptured Section 1250 gain taxed at up to 25% (IRC 1(h)(1)(E), 2026). Typical sources: a home office deducted on Schedule C, or years the house or a unit was rented.

How much else is taxable depends on where the office was. If the office was inside the dwelling unit, no allocation is needed and only the depreciation is taxed. If it was a separate structure, like a detached studio, the gain on that portion is not excluded at all (Treas. Reg. 1.121-1(e)). Former rentals have a further limit on periods of nonqualified use after 2008; that rule is covered on our second home page.

Ways to manage the gain above the exclusion

• Time the sale year. Taxable gain stacks on your other income, so a year with lower wages or after retirement can keep more of it in the 15% bracket. See year-end timing.
• Sell on terms. A Section 453 installment sale applies the exclusion first and then spreads the remaining gain across the years you are paid. A buyer's note should be secured by a first-position deed of trust on the home.
• Offset with losses. Capital losses and carryforwards offset the taxable gain; suspended passive losses from rentals do not, because home sale gain is not passive income. See loss carryovers.
• If part was a rental. The Section 121 and 1031 combination can exclude and defer in one sale.

To see your exclusion, state tax and installment options modeled together, get the Big Sale Tax Analysis.

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