What Is the IRS 14-Day Rule for Short-Term Rentals?

The 14-day rule comes directly from IRC Section 280A(d)(1). It determines whether your vacation or short-term rental property is treated as a rental property or a personal residence for tax purposes during the year.

The rule works like this: your property is classified as a personal residence if you use it personally for more than the greater of (a) 14 days, or (b) 10% of the total days you rent it to others at fair market value.

Personal Use Threshold = MAX(14 days, 10% × Total Fair-Market Rental Days)

If your personal use exceeds that threshold, your property is a personal residence under Section 280A. If it stays at or below it, your property is treated as a rental. The gap between those two outcomes is enormous — and most STR operators underestimate it.

What Counts as a Personal Use Day Under Section 280A?

This is where operators get caught. Section 280A defines personal use days broadly. Each of the following counts:

Any day you use the property for personal purposes. Whether you sleep there, relax there, or entertain guests there — it counts. Arrival and departure logistics alone don’t eliminate a personal use day.

Any day a family member uses the property — regardless of whether they pay you. Under §280A(d)(2), “family member” includes your spouse, siblings, half-siblings, ancestors, and lineal descendants. If your adult child books a weekend at your Smoky Mountains cabin and pays your standard nightly rate, that stay still counts as personal use. The statute does not carve out fair-market-rent exceptions for family.

Any day you rent the property below fair market value. If a friend stays for three nights at a discount, those three nights are personal use days under §280A(d)(2)(A). Fair market value means what an unrelated third party would pay on the open market for comparable accommodation.

Any day used in a home exchange or swap arrangement. Reciprocal-use arrangements count as personal use regardless of whether money changes hands.

What Does NOT Count as a Personal Use Day

This is the provision most operators misread — and it works in your favor when structured correctly.

IRC Section 280A(d)(2) excludes any day “which is used primarily for repair and maintenance of the property.” The key word is primarily.

Treasury Regulation §1.280A-1(e)(6) and supporting Tax Court case law establish a “substantially full-time” operational standard for what qualifies. In practice, this means you must be engaged in active maintenance or repair work for the equivalent of a normal workday — generally accepted as 7 to 8 hours. A day when you arrive at 8am, spend the day fixing the HVAC, replacing fixtures, and repainting a bedroom, and leave in the afternoon qualifies. A day when you spend the morning on repairs and the afternoon at the pool does not.

CPA Note — Family on the Premises: The statute contains an important protection that most operators don’t know about. Under Treas. Reg. §1.280A-1(e)(6), if you are working substantially full-time on repairs, the day is fully excluded from personal use even if your spouse or children are present on the property relaxing. The determining factor is your activity, not theirs. A trip to the property where you spend each day working a full day on legitimate maintenance while your family relaxes qualifies — provided you are genuinely working a full workday on legitimate maintenance each day you claim the exclusion.

Days when the property sits vacant do not count as personal use days. An unrented, unoccupied property does not accumulate personal use days by sitting empty. Only days involving actual use by you, your family, or a below-market renter count against the threshold.

What Happens When You Exceed the 14-Day Threshold

When your personal use days exceed the threshold, your property converts to a personal residence under Section 280A. Three things happen that significantly damage your tax position:

1. All Expenses Must Be Prorated

Your deductible rental expenses are limited to the percentage of total use days that were rental days:

Rental Use Percentage = Rental Days ÷ (Rental Days + Personal Use Days)

Deductible Rental Expenses = Total Expenses × Rental Use Percentage

Example: 180 rental days, 20 personal use days (200 total)

Rental use percentage: 180 ÷ 200 = 90%

Only 90% of expenses are deductible as rental expenses

Mortgage interest and property taxes split across schedules. The rental portion goes on Schedule E. The personal portion of mortgage interest goes on Schedule A as home mortgage interest. The personal portion of property taxes goes on Schedule A subject to the $10,000 SALT cap. Every other expense — insurance, utilities, repairs, supplies — the personal portion is simply non-deductible.

2. Deductions Are Sequenced and Cannot Exceed Rental Income

Under §280A(c)(5), once you’ve crossed the personal residence threshold, your deductible rental expenses are limited to your gross rental income from the property. You cannot generate a loss. The deduction sequence is:

1. First, deduct the rental portion of mortgage interest and real property taxes (which would otherwise be deductible personally on Schedule A)
2. Second, deduct operating expenses allocable to the rental use
3. Third, deduct depreciation allocable to the rental use — but only if steps 1 and 2 haven’t already consumed all the rental income

If your gross rental income is $30,000 and your prorated expenses are $40,000, you can deduct only $30,000. The excess $10,000 is not a loss — it’s a carryforward. Under §280A(c)(5), these disallowed expenses carry forward indefinitely with no expiration date, but they are strictly locked to future rental income from that specific property. They cannot be applied against other rental properties, other income sources, or future years in which the property is not rented.

3. You Cannot Use Rental Losses to Offset Other Income

This consequence connects directly to the non-passive STR loss strategy discussed in The Average Rental Period Test.

If your property is a personal residence under Section 280A, the loss limitation described above makes the average rental period test irrelevant. Even if your average rental period is under 7 days and you materially participate — both of which would normally allow you to use STR losses against your W-2 income — Section 280A’s loss cap kicks in first and eliminates any deductible loss before it ever reaches the passive activity analysis.

The two tests interact sequentially. Section 280A determines whether you can generate a loss at all. Section 469 (the passive activity rules) determines whether a loss, if it exists, can offset other income. You must clear the Section 280A gate before the Section 469 analysis even applies.

The 10% Rule: When the Threshold Is Higher Than 14 Days

For properties with high rental occupancy, the 10% calculation may produce a threshold above 14 days — and that threshold applies instead.

Example: 200 rental days × 10% = 20-day personal use threshold

If you rented your property for 200 days, your personal use threshold

is MAX(14, 20) = 20 days. You could use the property personally

for up to 20 days without triggering the personal residence classification.

But note the flip side: for a property with low rental activity — say, 80 rental days — the 10% threshold is only 8 days. In that case, the 14-day benchmark controls, and 15 personal use days would cross it.

How to Count Your Days Correctly

The day count is straightforward when you’re rigorous about it. Here is the tracking framework:

Rental days: Any day a tenant or guest occupies the property at fair market value, including check-in and check-out days where the tenant is present.

Personal use days: Any day you, your family member, or a below-market renter occupies the property, or any day you use the property for personal purposes even without an overnight stay.

Excluded days (no classification): Days the property is vacant. Days you spend entirely on maintenance or repairs (if the work is the primary purpose). Days when the property is under renovation and unavailable to rent or use personally.

Overlap days: The day a guest checks out and you check in counts as a personal use day if you stay overnight. The day you check out and a guest checks in does not count as personal use for you if you leave before the guest arrives. The IRS looks at the dominant purpose of each specific day.

Use a simple tracking document — a calendar, a spreadsheet, or the date-tracking function in your property management software — updated in real time. Do not rely on reconstruction at year-end. A contemporaneous log protects your position; a reconstructed one does not.

How This Interacts with the Non-Passive STR Loss Strategy

To achieve non-passive treatment for your STR losses — meaning, to use depreciation and other losses against your W-2 income — you need to satisfy three conditions simultaneously:

1. Average rental period of 7 days or fewer (the average rental period test)
2. Material participation in the STR activity
3. Personal use at or below the Section 280A threshold

All three. Not two of three. Exceeding the 14-day personal use threshold doesn’t just limit your deductions. It effectively dismantles the entire non-passive strategy by eliminating your ability to generate a deductible loss in the first place. You cannot access the tax benefits of Requirement 1 and Requirement 2 while violating Requirement 3. This is also why the personal use day count needs to be managed prospectively — throughout the year, not retroactively. Once you’ve used the property on day 15, you cannot unuse it.

Practical Example: Two Operators, One Rule

Operator A — Stays Under the Threshold

Sarah owns a lakefront cabin in Tennessee. She rents it for 190 days during the year. She and her family use it personally for 12 days. Her threshold is MAX(14, 19) = 19 days. At 12 personal use days, she is well under. Result: All of Sarah’s rental expenses are fully deductible. Her STR generates a $35,000 loss after depreciation. Her average rental period is 5.2 days and she materially participates under Test 3. She uses the $35,000 loss to offset her W-2 income directly. Tax savings at the 32% bracket: $11,200.

Operator B — Exceeds the Threshold

David owns a ski condo in Colorado. He rents it for 120 days. He and his extended family use it for 22 days throughout the ski season. His threshold is MAX(14, 12) = 14 days. At 22 personal use days, he exceeds it. Result: David must prorate all expenses. Rental use percentage: 120 ÷ (120 + 22) = 84.5%. Only 84.5% of his expenses are deductible as rental expenses. His gross rental income is $28,000. After applying the §280A(c)(5) deduction sequence, he has no usable rental loss — just a carryforward to future years. The average rental period test and material participation are irrelevant. His $35,000 potential loss is blocked.

Frequently Asked Questions

Does the 14-day rule apply to every short-term rental, or only vacation homes?

Section 280A applies to any dwelling unit that the taxpayer uses for personal purposes. This includes vacation properties, beach houses, ski condos, and primary-residence adjacent rentals. It also applies to the portion of a primary residence rented under certain conditions. If you have any personal use of the property, Section 280A is in play.

If my spouse uses the property, does that count as my personal use?

Yes. Under §280A(d)(2), days used by your spouse count as personal use days attributable to you. Both of you living in the same household and using the property have the same effect for purposes of the threshold calculation.

Can I avoid the rule by charging family members fair market rent?

No — but the definition of “family member” is narrower than most operators assume, and that distinction matters. Under §280A(d)(2), the family member rule applies to persons defined by IRC §267(c)(4): your spouse, brothers and sisters (whole or half-blood), ancestors (parents, grandparents), and lineal descendants (children, grandchildren). That list is exhaustive.

CPA Insider Tip: In-laws, step-relatives, aunts, uncles, cousins, nieces, and nephews are not legally considered family members under §267(c)(4). If your brother-in-law or step-sibling stays at your property and pays full fair market rate, those days count as rental days — not personal use days. This is a meaningful planning opportunity for operators with extended family networks who want property access without triggering the threshold. The one trap to avoid: if those same relatives receive any discount below fair market value, the below-market-rent rule under §280A(d)(2)(A) kicks in and the days flip to personal use regardless of the family definition. For the family members who are covered by §267(c)(4) — your spouse, siblings, parents, children — no fair market rent exception exists. Even a full-price booking from your sibling counts as personal use.

What if I use part of the property personally and rent another part?

Section 280A’s rules apply to the entire dwelling unit. Renting a bedroom while personally using the rest of the house triggers a complex allocation analysis under §280A(e). This scenario is outside the scope of typical STR operations and requires fact-specific CPA guidance.

Does the 14-day rule apply if I never intend to use the property personally at all?

If your personal use is zero days, you are not subject to the expense allocation or loss limitation rules under Section 280A. Zero is safely under any threshold. The rule only applies when there is actual personal use.

Can I use the Section 280A repair day exclusion to attend a family vacation if I do some maintenance while I’m there?

No. The repair day exclusion requires that maintenance or repair be the primary purpose of your presence on that specific day. A trip structured primarily as a vacation that includes some weekend maintenance work does not qualify. The exclusion is evaluated day-by-day based on the dominant purpose of each day.

Where do I track my personal use days?

A contemporaneous log — updated as days are used, not reconstructed at year-end — is the standard the IRS expects. A simple calendar or date log noting the occupant (you, family member, name of guest, vacancy) and the purpose (personal, rental, repair) for each day is sufficient. Keep it year-round.

Matt Nunn, CPA has been in public accounting since 2006. Builder’s Finance Co publishes financial education content for short-term rental operators. All tax and accounting claims in this article reflect the author’s professional interpretation and should not be relied upon as tax advice for your specific situation. Consult your CPA before making tax elections or strategic decisions. Pursuant to IRS Circular 230, any tax advice contained in this communication was not intended or written to be used, and cannot be used, for the purpose of avoiding tax-related penalties.