Updated July 30, 2026. Quick answer (2026): Under 24 months with no qualifying reason, the exclusion is zero, not reduced. A $152,000 gain at a 15% rate costs $22,800. Held twelve months or less, the gain is short-term and taxed at ordinary rates.
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What it costs when the exclusion is zero
Below 24 months of ownership and use, with no qualifying reason, Section 121 gives nothing. Not a reduced amount — nothing. A single filer with a $152,000 gain at a 15 percent capital gain rate owes $22,800 in federal tax on a sale they may have assumed was covered.
Short holds are usually short-term gains, which is worse
A property held twelve months or less produces short-term capital gain, taxed at ordinary income rates rather than the 0/15/20 percent long-term rates. The difference between selling at month eleven and month thirteen is not marginal; for a high earner it can be twenty percentage points on the whole gain. If a sale is close to the one-year line, the line is worth waiting for.
The three doors out
Section 121(c) opens the exclusion back up, prorated, for a change in place of employment, health, or unforeseen circumstances. These are real, commonly met categories — a job relocation, a serious diagnosis, a divorce, a multiple birth — and the prorated cap they produce usually covers the whole gain on a short hold, because the gain is small when the hold is short. The full mechanics are in the partial exclusion.
Basis still matters, and it is the only lever left
When the exclusion is unavailable, the only remaining way to reduce the number is to get basis right: purchase price, buying costs, and every capital improvement. On a short hold there has usually been renovation, and that spending is exactly what belongs in basis.
Related
Methodology
- Exclusion caps, the 2-of-5 test, the nonqualified-use allocation, the reduced-exclusion fraction and the depreciation carve-out are taken from the text of 26 U.S.C. 121. The 3.8 percent rate and its thresholds are from 26 U.S.C. 1411. Both were read on 2026-07-30.
- Section 121 caps and Section 1411 thresholds are written in the statute as fixed dollar amounts with no indexing mechanism, so they are built in. Long-term capital gain brackets ARE indexed annually, so your rate is an input rather than a lookup.
- Figures were computed by two independently written engines that agree to the cent, and the calculator on this page reproduces both exactly.
- Federal only. State treatment varies and some states do not follow the federal exclusion.
Educational estimate, not tax advice, and not a filed return. Federal only. Confirm anything that changes a filing decision with a CPA or tax attorney.
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