Capital Gains Tax & the $250k/$500k Exclusion

What it is

When you sell a home for more than you paid, the profit is a capital gain, which can be taxable. But a long-standing federal rule — the primary-residence exclusion under IRC §121 — lets many homeowners exclude a large chunk of that gain from taxation. A qualifying single filer can exclude up to $250,000 of gain, and a married couple filing jointly can exclude up to $500,000. For most primary-residence sellers, this means little or no capital gains tax. This is educational information, not tax advice — confirm your specifics with a tax professional or IRS Publication 523.

How it works

Two calculations matter: your gain, and whether you qualify.

Gain = amount realized − adjusted basis.

• Amount realized is roughly your sale price minus selling costs.
• Adjusted basis is what you paid for the home plus the cost of capital improvements you've made over the years (a renovation, an addition, a new roof). Keeping records of improvements raises your basis and lowers your taxable gain.

The 2-of-5-year test. To claim the exclusion, you generally must have owned and lived in the home as your primary residence for at least 2 of the 5 years before the sale. The two years don't have to be continuous. This is the core qualification hurdle.

Only gain above your exclusion amount is potentially taxable. So a married couple with a $400,000 gain who meet the test would typically owe no federal capital gains tax on it, because $400,000 is under the $500,000 ceiling.

How to think about it

A few important points:

• Primary residence only. The exclusion is for your main home, not an investment or rental property. Rentals follow different rules, including depreciation recapture (tax owed back on depreciation previously claimed).
• Frequency limit. The exclusion generally can't be claimed more than once every two years.
• Basis matters. Under-counting improvements inflates your apparent gain. Good records help.
• State taxes may differ. The §121 exclusion is federal; your state may treat the gain differently.
• Partial exclusions may apply in certain situations (a move for work, health, or unforeseen circumstances) even if you don't fully meet the 2-of-5 test.