Vacation Home 14-Day Rule: Rent It or Lose Write-Offs

Marcus and Dana Reyes, married filing jointly, own a $620,000 lakefront cabin in the North Carolina mountains. In 2026 they rented it at fair market value for 160 nights, grossing $48,000 in rental income, and spent several weekends there themselves. Their CPA modeled $61,000 of allocable expenses — mortgage interest, property tax, utilities, insurance, repairs, and depreciation — which would have produced a $13,000 rental loss. At their 24% federal bracket (MFJ taxable income in the $206,701–$394,600 range for 2026), that loss was worth roughly $3,120 in current-year tax savings, with more value waiting in suspended depreciation. The entire question came down to one number: how many days they personally slept in the cabin.

They were allowed the greater of 14 days or 10% of rental days. Ten percent of 160 rental days is 16 days. So their ceiling was 16 personal days. They had used it 15. One more weekend — day 17 — and the property would have flipped from a deductible rental into a “residence,” capping every deduction at the $48,000 of income and erasing the $13,000 loss. That is the cliff this article maps.

The three buckets every dual-use property falls into

IRC §280A sorts a home you both use and rent into exactly one of three tax treatments. The bucket is determined by two counts: how many days you rent it at fair market value, and how many days you use it personally.

The middle bucket is where most vacation-home owners land, and it is the one that quietly destroys the loss they were counting on. The whole game is staying in the top bucket.

The personal-use test, exactly as §280A(d) writes it

A dwelling is treated as a residence if your personal use during the year exceeds the greater of:

• 14 days, or
• 10% of the number of days the home is rented at a fair rental price.

The “greater of” framing matters enormously, and most owners read it backwards. If you rent the home heavily, the 10% figure can be your friend. Rent it 250 days and 10% is 25 days — you get 25 personal days before crossing. But rent it only 100 days and 10% is 10, which is less than 14, so your ceiling falls back to the 14-day floor. The fewer days you rent, the tighter your personal-use leash.

Three counting traps catch people every year:

1. Family use counts as your use. Days a sibling, parent, or child stays count as personal days unless they pay fair market rent AND it is their principal residence. A “free week for grandma” is a personal day.
2. Below-market rentals count as personal days. Renting to a friend at a discount is not a fair-rental day — it is a personal day, and it does not count toward the 10% denominator either. This shrinks your allowance from both sides.
3. Repair days do not count as personal use. A day you spend principally fixing the property — even if you sleep there — is excluded from personal use under the §280A regulations, provided the repair work is substantial and the main purpose of the trip.

What “capped at rental income” actually costs you

When you cross into the residence bucket, §280A(c)(5) does not delete your deductions — it caps and orders them. Expenses are allowed only up to gross rental income, deducted in this sequence:

1. Tier 1 — otherwise-allowable expenses: the rental share of mortgage interest and property taxes (these would be deductible on Schedule A anyway).
2. Tier 2 — operating expenses: utilities, insurance, repairs, management fees, supplies.
3. Tier 3 — depreciation: deducted last, and only if income remains after the first two tiers.

Because depreciation sits at the bottom of the stack, it is the first thing you lose. On a heavily-expensed property, the cap routinely zeroes out the entire depreciation deduction — the single largest non-cash write-off real-estate investors rely on. Disallowed amounts are not gone forever; they carry forward to future years under §280A(c)(5), but they can only ever offset future rental income from the same property, never your wages, never your other investment income.

Worked example: the cost of one extra weekend

Back to the Reyeses. Hold their facts constant — $48,000 gross rent, 160 rental days, $61,000 of allocable expenses producing a potential $13,000 loss — and toggle only their personal-use count.

The 17th personal day costs the Reyeses the entire $13,000 loss this year — $3,120 in current federal tax at their 24% MFJ bracket. The $13,000 is not destroyed; it becomes a suspended deduction usable only against future rent from this cabin. But “deferred and ring-fenced” is a far worse outcome than “deductible against this year’s income.” A single avoidable weekend converted a usable loss into a captive carryforward.

Why the §469 passive-loss rule is the second gate

Clearing the 14-day / 10% test gets you into the rental bucket, but it does not automatically let you deduct the loss against your salary. A second gate — the passive activity loss rules of IRC §469 — stands behind it. Rental real estate is passive by default, so even a properly-classified rental loss is generally trapped against passive income unless one of two doors is open:

• The $25,000 active-participation allowance. If you actively participate and your MAGI is under $100,000, you can deduct up to $25,000 of rental loss against ordinary income. It phases out between $100,000 and $150,000 MAGI — the Reyeses, well above $150,000, get $0 from this door.
• Real estate professional status (§469(c)(7)). Material participation plus 750+ hours and more than half your working time in real property trades. High bar; rarely available to W-2 households.

This is why the short-term-rental angle matters. If your average guest stay is 7 days or fewer, the activity is not a “rental activity” under the §469 regulations at all — it is treated like a business. With material participation, the loss can become non-passive and deductible against your wages even without real-estate-professional status. The day count under §280A and the average-stay count under §469 are two separate tests you must pass in sequence.

What most people miss: the interest-allocation choice that buys back days

Here is the lever almost no DIY filer uses. When the property is classified as a residence and deductions are capped, the IRS’s default method allocates mortgage interest and property taxes using rental days ÷ total days the property was used. But the Tax Court, in Bolton v. Commissioner and McKinney v. Commissioner, allowed allocation of interest and taxes using rental days ÷ 365 instead.

Why does that help? Interest and taxes are deductible on Schedule A regardless of the rental. By using the 365-day denominator, you allocate a smaller share of interest and taxes to the rental (Tier 1), which leaves more of the $48,000 income ceiling available for Tier 2 operating costs and Tier 3 depreciation. The interest and taxes you shifted off the rental do not vanish — they drop to Schedule A as itemized deductions. The net effect on a capped property is that the Bolton/McKinney method frees up depreciation that the IRS default method would have stranded. On the Reyeses’ numbers, the method choice can recover several thousand dollars of otherwise-suspended depreciation in the residence scenario. The IRS still litigates this; you take the position knowing it, and you document it.

The second overlooked point: depreciation recapture follows you regardless. Every dollar of depreciation you are allowed to deduct — or were entitled to deduct — reduces your basis and is recaptured at up to 25% (the §1250 unrecaptured gain rate) when you sell. If the cabin appreciates and you eventually sell at a long-term gain, that gain is taxed at 0/15/20% under the 2026 LTCG brackets, plus the 3.8% NIIT if your MAGI clears $250,000 MFJ. A property that “capped out” and gave you little current benefit can still hand you a recapture bill years later. Track basis from day one.

Augusta Rule vs. the vacation-home test: same number, opposite job

Both rules use “14 days” and both live in §280A, which is exactly why owners conflate them. They do opposite jobs.

A property cannot be in both worlds in the same year for the same dollars. If you rent under 15 days, §280A(g) excludes the income and the loss question is moot. The vacation-home test only engages once you rent 15+ days and the only live question becomes how much of your personal use you can fit under the ceiling.

The day-count log that protects the deduction

The classification turns on a number you must be able to prove. Keep a contemporaneous log for the whole year capturing:

• Every personal night — yours, family, and below-market guests — with names and dates.
• Every fair-rental night, with the rate charged and platform/booking confirmation, to support the 10% denominator.
• Repair-day documentation — receipts, photos, the work performed — for any day you want to exclude from personal use.
• FMV comparables proving your rental rate was a fair price, so those days count as rental days rather than disguised personal use.

Reconstructing this during an audit is far weaker than a calendar maintained as the year unfolds. The difference between 14 and 17 days is a five-figure swing; treat the log like the financial record it is.

Key takeaways

• Your vacation home becomes a “residence” under IRC §280A(d) when personal use exceeds the greater of 14 days or 10% of fair-rental days. Below that line it is a rental with full Schedule E losses; above it, deductions are capped at gross rental income.
• The cap under §280A(c)(5) deducts depreciation last, so crossing the line typically wipes out your largest write-off first. Disallowed amounts carry forward but can only offset future rent from the same property — never wages.
• Rent heavily and the 10% prong raises your personal-use ceiling above 14; rent lightly and you are stuck at the 14-day floor. Family stays and below-market rentals count against you on both sides of the ratio.
• Clearing §280A is only the first gate — the §469 passive-loss rules decide whether a properly-classified loss reaches your wages. A 7-day-average-stay short-term rental can sidestep the passive trap entirely.
• The decision lever: before booking your last personal weekend of the year, pull your running day count and compare it to the greater of 14 or 10% of rental days. If one more night crosses the line, the math on a fully-expensed property says rent that week to a paying guest instead — you keep the loss and pick up the income.