The safe harbor numbers
Under the IRS safe harbor (Rev. Proc. 2008-16), a vacation property qualifies for exchange treatment if, in each of the two years before the sale (and for the replacement, each of the two years after purchase), you:
- Rent it at fair market rates for at least 14 days, and
- Keep personal use to no more than 14 days or 10% of the days rented, whichever is greater.
Hit those numbers, document them, and the IRS won't challenge the property's investment status. Rent it 200 days a year and you can personally use it 20 (10%); rent it 30 days and your cap is 14.
What counts as personal use
Days used by you, your family, or anyone paying below market rent all count against the cap. Days you spend working on the property — repairs and maintenance — generally don't. A log with dates and receipts is cheap insurance; this is exactly the fact pattern the IRS audits.
Outside the safe harbor
Missing the numbers doesn't automatically disqualify the property — the safe harbor is a guarantee, not the only path. But you'd be arguing investment intent on the facts: rental listings, income reported on Schedule E, limited personal use. Courts have rejected exchanges of homes that were listed for rent but never actually rented and heavily family-used. If you're close to the numbers, the smart move is to adjust usage for two years before selling rather than argue after.
See what qualifying is worth →Vacation markets appreciate — check the tax bill an exchange would postpone