After

The post-closing stage on the seller side is mostly about capital gains reporting on the next year's tax return. The IRS doesn't tax the transaction at closing; reporting flows through the seller's individual return for the calendar year of the sale. Sellers who qualify for the § 121 primary-residence exclusion (up to $250,000 of gain for single filers, $500,000 for married joint filers, when the ownership-and-use test is met) often owe no federal tax on the gain, but the 1099-S form is still issued by the closing agent and the gain calculation still flows onto Schedule D and Form 8949.

Cost basis is the key number to get right. Basis equals the original purchase price plus all qualifying capital improvements over the years of ownership, minus any depreciation taken if the property was ever rented out. Capital improvements that increase basis include additions, major renovations, new roofs, HVAC replacements, and similar long-life upgrades. Routine maintenance (painting, minor repairs, landscape upkeep) does not increase basis. Sellers who owned the home for many years and never tracked improvements in real time often discover at sale that they have receipts for $40,000 of capital additions but documentation for only $15,000 of them, the difference becoming taxable gain.

Depreciation recapture applies when the home was rented out for any portion of the ownership period. The depreciation taken (or allowable, whether or not actually claimed) gets recaptured at a maximum rate of 25%, separately from the § 121 exclusion, even when the § 121 exclusion shields the rest of the gain. Sellers who converted a primary residence to a rental for a few years before sale often discover this complication late, because the recapture obligation can be substantial even when the residual gain is fully excluded.

State capital gains treatment varies. Some states (Texas, Florida, Washington, Tennessee, South Dakota, Wyoming, Nevada, Alaska) impose no state income tax and therefore no state-level gains tax. Others tax gains as ordinary income at brackets up to roughly 13% (California). The combined federal-plus-state effective rate on taxable gains above the § 121 exclusion can range from 15% to over 35% depending on state of residence and total income.

Sellers with substantial gain above the § 121 exclusion who don't have sufficient withholding through the year may owe a federal estimated-tax payment in the quarter following the sale to avoid an underpayment penalty. The right CPA review here often produces meaningful tax savings on a long-held appreciated home, and the conversation is worth having before the next quarterly estimated-tax deadline rather than at the next return filing.