How to avoid capital gains tax on real estate

The exclusion is the whole game

For a principal residence, section 121 excludes $250,000 of gain if you file single and $500,000 if you file jointly. That is not a deduction or a deferral — the excluded gain simply never becomes taxable income.

For the majority of home sales it covers everything, and the tax is zero. Nothing else on this page matters if your gain fits inside it.

The two-of-five-year test

To qualify you must have owned the home for at least two of the five years ending on the sale date, and used it as your principal residence for at least two of those same five years.

Three details people get wrong. The two years need not be continuous — twenty-four months in aggregate is enough. The ownership and use periods need not be the same two years. And for joint filers, only one spouse must meet the ownership test, though both must meet the use test to get the full $500,000.

There is also a frequency limit: you generally cannot claim the exclusion if you claimed it on another home within the previous two years.

The reduced exclusion, and the step most calculators get wrong

If you fall short of two years because of a change in place of employment, a health reason, or another qualifying unforeseen circumstance, you do not lose the exclusion. You get a reduced one.

Here is the part that is routinely computed incorrectly. The reduction prorates the maximum exclusion, not the gain. Treasury Regulation 1.121-3(g) is explicit about it.

Work through it: eighteen months of qualifying use out of twenty-four is a fraction of 18/24. Applied to the $250,000 maximum, that gives an exclusion of $187,500. A calculator that instead applies 18/24 to the gain produces a completely different and wrong answer — and for a gain smaller than the maximum it will understate the exclusion badly. This site prorates the maximum, and a test fixture pins that behaviour.

Depreciation is never excluded

If you ever let the property or claimed a home-office deduction, the depreciation allowed or allowable after 6 May 1997 cannot be excluded under section 121. It remains taxable as unrecaptured section 1250 gain at up to 25%, no matter how large your exclusion is.

So a home that was briefly a rental produces a small taxable amount even when the exclusion covers everything else. It catches people who let a property for a year while trying to sell it.

Basis: the lever people forget

Every dollar of capital improvement raises your basis and therefore reduces your gain. A new roof, an extension, a rewiring, a kitchen — these add to basis. Routine repairs and maintenance do not.

Selling costs also come off: agent commission, legal fees, transfer taxes. On a typical sale those alone are several percent of the price.

This is the least glamorous lever on the page and often the most valuable, because it requires no planning at all — only records. If you are approaching the exclusion ceiling, an afternoon spent finding twenty years of improvement receipts can be worth more than any timing strategy.

Beyond the exclusion

For investment property rather than a home, a 1031 like-kind exchange can defer the gain into a replacement property. It defers rather than forgives, the deadlines are strict, and it does not apply to a principal residence. This calculator does not model it.

Assets held until death generally receive a stepped-up basis, extinguishing the unrealised gain for heirs. And spreading a sale across two tax years, or realising it in a low-income year, works for property exactly as it does for shares — see the general levers.

Converting a rental into a residence, and the limit on it

Moving into a property you previously let, living there two years and then selling looks like a route to converting rental gain into excluded gain. It works, but far less completely than it first appears.

Section 121(b)(5), added for periods after 2008, allocates the gain between qualified and nonqualified use. Time the property was not your principal residence produces a proportional share of gain that cannot be excluded, so a property let for eight years and lived in for two does not become fully excludable by the move.

And depreciation claimed during the rental years is recaptured regardless — the exclusion never reaches it.

Divorce, death and the ownership tests

The two-of-five-year tests have specific relief in circumstances where applying them literally would be unfair.

A spouse who receives a home in a divorce transfer generally takes on the transferor’s ownership period, so the clock is not reset. A taxpayer whose spouse has died may be able to use the full $500,000 joint exclusion on a sale within two years of the death, provided the couple would have qualified.

Service members and certain government employees can suspend the five-year lookback for periods of qualified extended duty, up to ten years — which prevents a posting abroad from quietly disqualifying a home.

These are exactly the sort of provisions this calculator does not model. It applies the ownership and use months you give it, so if one of the above applies to you, the months to enter are not necessarily the months you actually lived there.

The records to keep, and for how long

Basis is the lever most available to most owners, and it is the one most often lost to poor record-keeping. What matters is knowing what to keep.

Keep: the closing statement from purchase and from sale, invoices for capital improvements — additions, a new roof, replacement windows, rewiring, a new heating system, landscaping that adds value — and records of any casualty losses or insurance reimbursements that adjusted basis.

Do not bother: routine repairs and maintenance do not add to basis. Repainting, fixing a leak, servicing a boiler and replacing a broken pane are all maintenance rather than improvement, however much they cost.

On duration: the usual advice to keep tax records for three years is about the assessment period for a return already filed. Basis records are different — they support a gain calculation on a sale that may be decades away, so they need to survive for as long as you own the property and then for the assessment period after the sale year.

For a property held twenty or thirty years, this is the difference between a documented basis and a guessed one. It is unglamorous, it requires no planning, and on a sale near the exclusion ceiling it can be worth more than every timing strategy on this page.

The exclusion is per sale, not per lifetime

A common misunderstanding, and a legacy of the rules that applied before 1997. There is no once-in-a-lifetime limit and no age requirement on the section 121 exclusion.

You can claim it repeatedly, on successive homes, provided each sale meets the ownership and use tests and you have not claimed it on another home within the previous two years. Someone moving every three or four years can use it every time.

The older rules — a one-time exclusion available from age 55, and a rollover that deferred gain into a replacement home — were repealed in 1997 and replaced by the current exclusion. Advice framed around either is nearly thirty years out of date, and it still circulates.

Worked example

Computed by the same engine that powers the calculator, at the moment this page was built — not typed in by hand. Open the derivation to see every rule and citation.

Run your own figures

Nothing you enter leaves your browser. The calculation runs locally and no values are transmitted or stored on a server — see the privacy page.

Related questions

Keep reading

• How much is capital gains tax on real estate?Three property types, three different answers — and why a long-held rental costs more than the headline rates.
• How to avoid capital gains taxSix legal levers that move the rate rather than hide the gain, each with the arithmetic behind it.
• When do you pay capital gains tax?Owed for the year the sale closes, often due quarterly before then. The dates, and the safe harbour.

The full guide index lists every answer page, and the state comparison covers the state layer on top of these federal figures.