Capital Gains Tax on a Home Sale: 7 Scenarios That Change the Answer

The seven scenarios, at a glance

Scenario 1 · Divorce or separation

You divorced and your ex-spouse kept living in the house

The Section 121 use test asks whether you lived in the home for 24 of the last 60 months — which looks fatal if you moved out at the divorce and your ex-spouse stayed. IRS Publication 523 closes that gap: if your former spouse is allowed to live in the home under a divorce or separation instrument and uses it as their main home, you are treated as using it too, even though you are not physically there.

If neither of you occupies the home under such an instrument — say it's rented to a third party after the split — you can still count any period you owned the home, solely or jointly with your former spouse, toward the ownership leg. The two legs are tested separately, so a long-owned, recently-vacated home can still pass both.

Scenario 2 · Death of a spouse

Your spouse died and you're selling the home alone

Losing a spouse does not automatically cut the exclusion to the single $250,000 amount. Publication 523 preserves the full $500,000 joint-return exclusion for a surviving spouse who sells within 2 years of the date of death, provided all of the following hold: the survivor hasn't remarried by the sale date, neither spouse excluded gain on another home sale in the 2 years before this sale, and the 2-of-5-year ownership and use tests are otherwise met (generally by either spouse, individually or combined).

Miss that 2-year window and the exclusion drops to $250,000 the day after — a hard deadline worth flagging to an estate attorney early, not discovered at closing.

Scenario 3 · Inherited home

You inherited the house — a different mechanism entirely

This is not a Section 121 question at all — it's a basis question, and it usually makes the tax bill much smaller than heirs expect. Under IRC §1014, property acquired from a decedent generally takes a basis equal to its fair market value on the date of death — not what the decedent originally paid, however low that was (IRS Publication 551). This is the "stepped-up basis."

Sell soon after inheriting, close to the appraised date-of-death value, and the taxable gain is often near zero — a parent's home bought in 1985 for $60,000 and worth $410,000 at death has a basis of roughly $410,000 for the heir, not $60,000. This applies whether or not any heir ever lived there, so the ownership-and-use tests above are usually irrelevant here. One exception worth knowing: appreciated property the decedent received as a gift within one year of death does not get the step-up.

Scenario 4 · Second home or vacation property

It was never your main home

Section 121 excludes gain on a principal residence only. A vacation home, a second home you never lived in as your main residence, or a straight rental property gets no exclusion at all — the full gain is taxed at the long-term capital gains rate your income lands in (0/15/20%), plus depreciation recapture if it was ever rented, plus the 3.8% net investment income tax if you're above the threshold. The one deferral route for this category is a Section 1031 like-kind exchange into another investment property — available only to investment or business property, never to a primary residence.

Scenario 5 · Former rental you moved back into

It was a rental before it was your home again

Two separate rules stack here, and both cut against the seller. First, any depreciation claimed after May 6, 1997 is never excludable under Section 121 — it's taxed separately as unrecaptured Section 1250 gain, at a maximum 25% rate, before the exclusion is even applied.

Second, and less well known: under 26 U.S.C. §121(b)(5), added in 2008, any period after December 31, 2008 that the home was used as a rental or business property rather than your main residence counts as "nonqualified use." The gain is allocated between qualified and nonqualified periods by the ratio of nonqualified time to total ownership time, and the nonqualified share cannot be excluded — even if you separately pass the 2-of-5-year ownership and use tests on the whole property. Reconstructing that allocation needs a full month-by-month use history, which is exactly why our calculator names it as a figure it will not silently estimate. If you cannot reconstruct the depreciation figure the recapture line needs, the rental depreciation calculator rebuilds it from your rental history.

Scenario 6 · Military or Foreign Service orders

You were deployed or posted away for years

The standard test looks back only 5 years, which can knock out an otherwise-qualifying owner who spent years overseas on orders. Under 26 U.S.C. §121(d)(9), a member of the uniformed services, the Foreign Service, the intelligence community, or the Peace Corps on qualified official extended duty — active-duty orders for an indefinite period or more than 90 days, at a post 50+ miles from the home or in government quarters — can elect to suspend the 5-year look-back for up to 10 years, for a maximum look-back of 15 years to find the required 24 months of ownership and use (IRS Publication 523). The election is made per sale, not automatically applied.

Scenario 7 · State tax

Your state adds a separate bill — or doesn't

Every figure above and on the calculator is federal only. What your state does with the same gain varies enormously: