Updated July 30, 2026. Quick answer (2026): Section 121 applies only to a principal residence, so a vacation or second home gets no exclusion and the whole gain is taxable. Which home is ‘principal’ is a facts test, not an election.
Which property is ‘principal’ is decided on facts you can arrange in advance.
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A second home gets no exclusion at all
Section 121(a) applies to property “used by the taxpayer as the taxpayer’s principal residence.” A vacation house, a lake cabin, or an investment property held for personal use is not that, and the entire gain is taxable. There is no reduced version, no partial credit, and no election to treat a second home as the first.
How “principal” is actually decided
Where a taxpayer has two residences, the principal one is the one used a majority of the time, supported by the ordinary evidence of where a life is centred: the address on the tax return and driver’s licence, voter registration, where mail and bank statements go, where employment is, and where the family lives. It is a facts test, not an election.
Converting a second home into a principal residence works, slowly and partially
Moving into a vacation home and living there two of the next five years can bring it inside Section 121 — but the years it spent as a non-residence after 2008 become nonqualified use under 121(b)(5), and the gain allocated to them stays taxable. The conversion is worth doing and it is not a reset. That allocation is worked through on the rental-conversion page.
The one advantage a second home has
A loss on a personal residence is never deductible. A loss on a property genuinely held for investment can be. The classification that costs you the exclusion on a gain is the same classification that can rescue a loss, which is why the label should be decided on the facts and documented before a sale rather than argued afterwards.
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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