Home sale tax calculator

The gain is net proceeds, the sale price less selling costs, minus the cost basis: what you paid plus capital improvements. The exclusion then takes its amount off the top: $250,000 for a single filer, married filing separately or head of household, $500,000 for a joint return. Whatever survives is taxed; whatever the exclusion covers is simply gone from the return.

The calculator applies the dollar cap and nothing more. The rules behind the cap are flagged, not computed: you must have owned the home and lived in it for two of the last five years, and you must not have used the exclusion on another home within two years. A row that fails those tests is a warning on the checklist, not a different number.

What survives the exclusion keeps the holding period. A home owned more than one year, which almost every qualifying sale was, puts its above-exclusion gain on the long-term schedule. A home sold within a year of purchase puts the remainder in the short-term brackets instead. And a principal residence sold at a loss never produces a deductible loss; the row is marked exempt and that is the end of it.

You bought a home in May 2013 for $600,000 and sold it in July 2026 for $1,240,000, paying $40,000 in commission and closing costs. Net proceeds are $1,200,000, so the gain is $600,000. Filing jointly, with wages of $150,000.

The exclusion takes its $500,000 off first. That leaves $100,000 of taxable long-term gain from a house owned thirteen years. On the 2026 joint schedule, wages after the standard deduction of $32,200 already sit past the $98,900 zero breakpoint, so the whole remainder pays 15%: $15,000. Modified adjusted gross income lands exactly at $250,000, the joint net investment income tax threshold, and a dollar at the threshold pays nothing, so no surcharge follows. Against the whole $600,000 gain, the bill is an effective 2.5%.

Now the other case. Sell a $320,000 home bought in 2018 for $505,000, a gain of $185,000 on a single return: the exclusion covers all of it, the row is marked exempt, and the tax is $0. No capital gain is reported at all.

• Selling costs come straight off. Commission and closing costs reduce the proceeds before the gain is measured, and they matter most in a sale close to the exclusion.
• Improvements raise the basis. A new roof or an added room cuts the gain; repairs deducted or paid in their own year do not count twice.
• The cap follows your filing status on the row. The calculator reads the same status as the federal layer: $250,000 single, separate or head of household, $500,000 joint.
• The two-year tests are warnings. Owned and lived in for two of the last five years, no exclusion used in the last two: the checklist flags a main-home row with those checks and the calculator prices the cap only.
• A house sold within a year of purchase is the one soft spot. Its above-exclusion remainder is short-term and rides the ordinary brackets at up to 37%.
• State tax still reads the gain. Where a state taxes capital gains, the exclusion lowers what the state layer sees too, because the layer is computed on the gain the calculator reports.