Capital Gains Tax on a Second Home: What You Owe and What Changes It

Why a second home is taxed like an investment

The home sale exclusion in IRC 121(a) covers property you owned and used as your principal residence for two of the five years before the sale. A lake house, ski condo or beach place you visit on weekends fails the use test no matter how long you have owned it, so every dollar of gain is taxable. Long-term gain is taxed federally at 0%, 15% or 20%, with 20% starting above $613,700 of taxable income for joint filers (Rev. Proc. 2025-32, 2026); our capital gains hub has the full table.

Two more layers usually apply. Gain on a second home is not from a trade or business, so it counts toward the 3.8% net investment income tax once modified AGI passes $250,000 for joint filers (IRC 1411, not indexed, 2026). And the state where the home sits taxes the gain even if you live elsewhere. In the first example the federal part is $98,705, the 3.8% adds $21,660, and Colorado's flat 4.4% (2026) adds $26,400.

The asymmetry stings in down markets: a loss on a purely personal second home is a nondeductible personal loss, while the gain is fully taxed.

Your basis: what you can add before you compute the gain

Gain is the net sale price minus adjusted basis. For a second home, basis is the purchase price plus closing costs you paid at purchase, plus capital improvements: a new roof, a dock, an addition, a septic replacement. Repairs and upkeep do not count. Selling costs such as commissions and transfer taxes reduce the amount realized. Second homes are often owned for decades and improved piecemeal, so rebuilding the improvement file from old invoices, permits and bank records is the cheapest way to shrink the bill. Our adjusted basis guide walks through what counts.

If you rented it out: the 14-day line and depreciation

How you used the place each year decides how it is treated. Under IRC 280A(d)(1), it is a residence for the year if your personal use exceeds the greater of 14 days or 10% of the days it was rented at fair rent. Rent it fewer than 15 days in a year and the rent is not income at all (IRC 280A(g)). Rent it more, and you report the income and may deduct expenses, including depreciation, allocated by rental days.

That depreciation comes back at sale. Gain up to the depreciation is unrecaptured Section 1250 gain taxed at up to 25% (IRC 1(h)(1)(E), 2026), and the rule reaches depreciation you were entitled to claim even if you skipped it. In the second example, the same $600,000 gain costs $154,393 instead of $146,765, a difference of $7,628, all from the 25% layer. A rented second home can also release suspended passive losses at sale; see rental property gains.

The 1031 safe harbor for vacation homes (Rev. Proc. 2008-16)

A 1031 exchange needs property held for investment, and a home you mostly enjoy yourself is not. The IRS created a safe harbor in Rev. Proc. 2008-16 (effective for exchanges on or after March 10, 2008). The IRS will not challenge investment intent for a dwelling unit if:

• You owned it at least 24 months immediately before the exchange.
• In each of the two 12-month periods before the exchange, you rented it at fair rent to others for 14 days or more.
• Your personal use in each of those periods did not exceed the greater of 14 days or 10 percent of the days it was rented at fair rent (Rev. Proc. 2008-16).

The replacement property must meet the same tests for the 24 months after the exchange. Falling outside the safe harbor does not automatically kill an exchange, but you then argue investment intent on the facts. A converted second home can work with a 1031 exchange; if the plan is to retire into the replacement home later, read Section 121 and 1031 combined first, because IRC 121(d)(10) blocks the exclusion on a home acquired in an exchange until you have owned it five years.

Moving in: the nonqualified use rule since 2009

Before 2009, owners could move into a vacation home for two years and exclude up to $500,000. Congress closed that. Under IRC 121(b)(5), gain is allocated to "nonqualified use" (any period after December 31, 2008 when the home was not your or your spouse's principal residence) by the ratio of those periods to your total ownership, and that share cannot be excluded.

• Years before 2009 are not nonqualified use, so long-held vacation homes get a better ratio.
• Time after you move out of a principal residence, within the five-year window, does not count against you. The rule bites second-home-then-main-home, not main-home-then-rental.
• Depreciation from rental years is carved out first and taxed at up to 25% regardless (IRC 121(b)(5)(D)).

In the third example, six of ten ownership years were second-home years, so 60% of the gain stays taxable. The tax caused by the sale is $82,380, against $146,765 had they never moved in.

Owning a second home in another state

The state where the home sits taxes the gain as its own source income, and your home state taxes you on everything, usually with a credit for tax paid to the other state. Many states also require the buyer or escrow to withhold from a nonresident seller's proceeds; Colorado, for example, withholds the lesser of 2% of the price or the net proceeds on sales over $100,000 (Colorado DR 1083, 2026 rule). If your home state has no income tax, the second home's state is the only state layer. See the Colorado page, and if you are planning a move, the residency change analysis; a move will not change the state where a vacation home sits.

Spreading or deferring the gain

If a buyer wants terms, a Section 453 installment sale spreads the long-term gain across the years you are paid, which can keep more of it in the 15% bracket and under the NIIT threshold in later years. Any 25% depreciation gain is reported first, before the lower-taxed gain (Treas. Reg. 1.453-12). Families who plan to keep the place should compare a sale now with holding it for the basis step-up at death (step-up analysis); a gift to children during life carries your low basis to them. To compare a sale, an installment note, a 1031 and holding side by side, get the Big Sale Tax Analysis.

Run your own numbers

Frequently asked questions