Related DST offerings
- Active 1031 DST offerings179 Active
New to DSTs? What is a DST?
On this page
A vacation home you rent to strangers part of the year and use yourself the rest looks like an investment. The IRS does not always agree.
A 1031 exchange lets you defer capital gains tax when you sell one investment or business property and buy another. Personal-use property does not qualify. A vacation home lives in between, and where it lands decides whether the exchange holds up.
Revenue Procedure 2008-16 drew a line you can stand on. It sets a safe harbor: a set of conditions that, if you meet them, keeps the IRS from challenging whether you held the property for investment. Meet it and the exchange is protected. Miss it and the whole thing is open to challenge.
The safe harbor in Rev. Proc. 2008-16
The safe harbor covers four 12-month periods: the two immediately before the exchange and the two immediately after. You must own the property for the full 24 months on each side, and it has to pass the same two tests in every one of those periods, first as the property you are selling, then as the one you are buying.
The property you sell (relinquished)
For each of the two 12-month periods immediately before the exchange:
Test | Requirement |
|---|---|
Rental test | Rented at fair market value for 14 or more days |
Personal use test | Personal use does not exceed the greater of 14 days or 10% of rental days |
The property you buy (replacement)
For each of the two 12-month periods immediately after the exchange:
Test | Requirement |
|---|---|
Rental test | Rented at fair market value for 14 or more days |
Personal use test | Personal use does not exceed the greater of 14 days or 10% of rental days |
Both tests, all four periods. Fail either one in a single period and the safe harbor is gone for the entire exchange.
How the personal use test works
Personal use counts the days you stay at the property, the days family members stay, and any day you use it even while you are managing it. It does not count days spent only on maintenance or cleaning between tenants, as long as you are not sleeping there.
The limit is the greater of 14 days or 10% of the days the property was rented.
Rental days | 10% of rental days | Personal use limit (greater of 14 or 10%) | Example: 12 personal days |
|---|---|---|---|
30 | 3 | 14 days | Pass |
50 | 5 | 14 days | Pass |
100 | 10 | 14 days | Pass |
150 | 15 | 15 days | Pass |
200 | 20 | 20 days | Pass |
Below 140 rental days, the flat 14-day cap governs. Above 140, the 10% figure is the larger number and gives you more room. A high-volume short-term rental booked 200 or more days a year leaves the widest personal-use allowance of all.
What counts as fair market rent
Rent has to be what an unrelated tenant would actually pay. Renting to family at a discount does not count toward the 14-day minimum: if comparable homes nearby go for $2,000 a month, charging a relative $500 fails the test. Rent from family counts only if the relative pays fair rent and lives there as their main home. A relative's vacation week counts as personal use even at full price.
The four-year clock
Say you sell your vacation home on June 15, 2025, and buy the replacement on August 1, 2025. You must have owned the old home since June 15, 2023 and meet both tests in June 15, 2023–June 14, 2024 and June 15, 2024–June 14, 2025; you must own the new one until at least August 1, 2027 and meet both tests in August 2, 2025–August 1, 2026 and August 2, 2026–August 1, 2027. Each row below is one of those 12-month periods, by the year it starts:
Period starting in | Property | Requirement |
|---|---|---|
2023 | Relinquished | Meet both tests |
2024 | Relinquished | Meet both tests |
2025 | Replacement | Meet both tests |
2026 | Replacement | Meet both tests |
A failed test on the relinquished property in the period starting June 2023 compromises the whole exchange, which is why the planning has to begin well before you list the property.
What happens if you miss the safe harbor
Miss it, and the IRS can treat the property as personal, which does not qualify for 1031 at all. If the exchange is disallowed:
- Capital gains tax comes due on the full realized gain
- Interest and penalties may apply
- Your basis in the replacement property may be recalculated
On a $400,000 gain, that can mean a six-figure tax bill you never budgeted for.
Documentation an audit will ask for
If the IRS audits the exchange, it will ask for proof that you cleared the safe harbor. Keep:
Keep the same file for the replacement property for the two years after the exchange.
Planning conservatively
Owners who want the safe harbor to hold tend to work the same way.
They start early. Because both 12-month periods before the sale count, managing rental and personal use has to begin at least two full years ahead of a planned sale.
They track every day. A contemporaneous log of rental and personal-use days, not a reconstruction from memory, is what an audit expects.
They charge market rent. Comparable listings set the number, with no family discount.
They plan the replacement property, not just the one they are selling. It has to be rented and kept under the personal-use limit for two years after the exchange. A property meant mainly as a personal retreat will not clear the safe harbor.
And they get it in writing. Before exchanging a vacation home, confirm with your CPA that you meet the safe harbor, and get that assessment in writing.
The safe harbor is strict, but it is clear: clear the thresholds and the IRS will not second-guess whether you held the property for investment. If you are not certain your property qualifies, consult an expert before you proceed. Professional guidance costs a fraction of a disallowed exchange.
Frequently asked questions
What is the safe harbor rule for vacation homes in 1031 exchanges?
Under IRS Rev. Proc. 2008-16, a property clears the safe harbor if, in each of the two 12-month periods before the exchange and the two after, it is rented at fair market value for at least 14 days and personal use stays within the greater of 14 days or 10% of the rental days. Both tests, all four periods, and the exchange is protected.
If I rent my vacation home for 200 days but use it personally for 30 days, does it qualify?
No. Ten percent of 200 rental days is 20, so your personal-use limit is 20 days. At 30 days you are over the line, and you fail the safe harbor.
Can I count renting the property to family members or friends at a discount toward the 14-day rental requirement?
No. Days a family member uses the home count as personal use, even at market rent, unless the home is their principal residence. Renting to unrelated guests at market rent is what counts toward the 14 days.
What happens if I miss the safe harbor in one of the four years?
You lose the safe harbor. The IRS can argue the property is personal and does not qualify for 1031 treatment, which can cost you the entire exchange - tax on the full gain, plus possible penalties. That is why meticulous documentation matters.
Do I need to rent the replacement property under the safe harbor, or just the relinquished property?
Both. The test applies to the relinquished property for the two years before the exchange and to the replacement property for the two years after. You have to clear it on both sides.