Capital Gains Tax on a Second Home

A second home or vacation property occupies an uncomfortable middle ground under federal tax law. It generally does not qualify for the Section 121 primary residence exclusion, because the owner does not use it as a principal residence for the required period, and it generally does not qualify for a Section 1031 exchange either, because it is not held primarily for investment or business use. San Francisco, CA owners of a Tahoe cabin, a wine country property, or a coastal second home often assume one of these two tax breaks will apply, only to learn from their CPA that neither does without a change in how the property has actually been used.

Why the Personal Use Test Matters

The IRS looks at how a property was actually used, not simply how the owner labels it. A second home used primarily by the owner and family, with only occasional short term rentals, is generally treated as personal use property, and gain on its sale is taxed as an ordinary capital gain with no exclusion and no exchange eligibility. To become eligible for a 1031 exchange, a second home generally needs to be converted to genuine rental use, held for a period of time, and rented at fair market terms with limited personal use, consistent with the safe harbor guidance the IRS has issued for dual use vacation property. Simply intending to convert a property, without an actual change in use documented by lease agreements and rental income, is unlikely to support exchange treatment if challenged.

Planning a Use Change Before a Sale

San Francisco, CA owners who want to defer gain on a second home through a 1031 exchange need to plan the conversion well before a sale, generally establishing a rental history of at least a year or two, limiting personal use days relative to rental days, and keeping documentation such as lease agreements, rental platform records, and property management statements. We help owners evaluate whether their second home's actual use history, or a planned change in use, would likely support exchange treatment, and we coordinate with the owner's CPA and attorney to review the specific facts, since this is an area where the IRS scrutinizes the difference between a genuine investment conversion and a last minute attempt to avoid tax on a personal use property.

If a second home clearly remains personal use property through the date of sale, the resulting gain is simply taxed as a capital gain federally, with no preferential rate reduction at the California level, since California taxes recognized gain as ordinary income regardless of the character of the property. Owners in this situation sometimes ask about other deferral strategies, but the reality is that without either meeting the Section 121 use test for a primary residence or establishing genuine investment use for a 1031 exchange, the gain on a second home sale is generally fully taxable in the year of sale.

We recommend San Francisco, CA owners considering a sale of a second home have this use analysis done well ahead of listing, ideally a year or more in advance if a rental conversion is being considered, since the timeline needed to build a defensible rental use history does not compress to fit a fast closing.