Personal Use of Rental Property: Tax Planning for Physicians
Personal use of rental property is the rule that quietly undoes short term rental tax planning. You cleared the seven day average, and you logged the hours and beat the cleaning service.
Then the family spent Thanksgiving and spring break at the cabin, and a deduction you'd already planned around got capped.
That's the personal use rule at work. It runs on a day count that almost never gets kept during the year, and it's the failure we see catch physicians who did everything else right.
One thing to clear up first, because both rules involve the number 14 and they point in opposite directions. The Augusta rule lives in section 280A(g): rent a home out for fewer than 15 days and the income is excluded from your gross income.
This post is about section 280A(d), where using the property yourself too many days limits what you can deduct. Same statute, opposite direction, and the vacation home math is considerably less friendly than the Augusta math.
In This Blog
How many personal days do you actually get?
More than 14, usually. The property becomes a residence for the year once your personal use exceeds the greater of two figures.
One is 14 days. The other is "10 percent of the number of days" the unit is rented at a fair rental (26 U.S.C. 280A(d)(1)).
The greater of. So a property rented 180 days at fair rental gives you 18 days rather than 14, and a property rented 300 days gives you 30.
One catch is built into the same sentence. A day you use personally isn't counted as a day rented at a fair rental, so your own personal days can never quietly raise your allowance.
Two counting mechanics matter before you start tallying:
Any part of a day counts as a full day, so driving up on Friday evening to meet the cleaner is a personal day.
Only days actually rented at fair rental go in the denominator, which means days the property sat listed and empty don't count (IRS Topic no. 415).
More on how those days interact with the seven day average is in our guide to the short term rental tax loophole. What follows is the part that catches people who already understand the basic test.
Whose days count as yours?
Not just yours, and this is where the count gets away from most owners.
Personal use includes use by the taxpayer and by anyone else who holds an interest in the unit. It also includes use by "any member of the family" of either one, as defined in section 267(c)(4) (280A(d)(2)(A)).
That last clause does more work than it looks like. If you own the cabin with your brother, a week there with his kids counts against your total rather than only against his.
Who counts as family?
A closed list. Section 267(c)(4) says family "shall include only his brothers and sisters" by whole or half blood, plus spouse, ancestors, and lineal descendants (26 U.S.C. 267(c)(4)). In practice:
Siblings, including half siblings
Spouse
Parents, grandparents, and further up
Children, grandchildren, and further down
Cousins, nieces, nephews, and in laws are not on that list, but read the next rule before you act on that.
Does a discounted stay count?
Yes. Use by any individual is personal use "unless for such day the dwelling unit is rented for a rental which, under the facts and circumstances, is fair rental" (280A(d)(2)(C)).
Your cousin isn't family under the statute, but a discounted week for your cousin is still seven personal days.
Fair rental is a facts and circumstances question rather than a formula, and a friends and family rate is exactly the kind of arrangement that fails it.
What about home swaps?
Also caught. A day counts if someone uses your place "under an arrangement which enables the taxpayer to use some other dwelling unit" (280A(d)(2)(B)). The statute applies that whether or not rent changes hands for the other unit.
Trading a week at your place for a week at theirs is seven personal days even when money moves in both directions.
There's one real exception, and it's narrow. You aren't treated as using the unit personally where it's "rented, at a fair rental, to any person for use as such person's principal residence" (280A(d)(3)).
A long term tenant who actually lives there is fine. If that person holds an interest in the property, the exception only applies under a shared equity financing agreement, which is a specific written arrangement rather than a handshake.
Do repair days count as personal use?
Not if the work is real and it fills the day. A day you spend working substantially full time repairing and maintaining the property isn't a personal use day (IRS Publication 527).
Both halves of that matter, and the second half is the one that gets stretched.
Substantially full time rules out the weekend where you fix the deck railing in the morning and take the boat out after lunch. There's no bright line hour count published for it, so a day that was half work and half vacation is a day you should expect to count.
The exception is also written narrowly. Section 280A(d)(2) directs Treasury to write rules for use of the unit "for repairs and annual maintenance," and it doesn't mention improvements (280A(d)(2)).
Fixing a broken water heater is maintenance, while framing a new deck is an improvement. Whether a construction week sits inside or outside that exception is worth raising with your tax team before you go rather than after.
What actually happens if you cross the line?
Day 19 doesn't destroy the deduction. It caps it, and that distinction changes how you plan around it.
Once the unit is a residence for the year, deductions attributable to the rental can't exceed the gross income from that use, reduced by certain other deductions (280A(c)(5)). In practice the rental can break even, but it can't produce the loss you were planning to use.
The excess isn't gone. The statute says any disallowed amount "shall be taken into account as a deduction (allocable to such use)" in the following year. It carries forward and faces the same cap again, so a property that stays over the line can stack carryforwards for years.
How does proration work?
Separately, once you use the property personally at all, expenses get prorated. Deductible rental expenses are limited by the ratio of days rented at a fair rental to "the total number of days during such year that the unit is used" (280A(e)(1)).
Note the denominator: days used, not 365. Nights the cabin sits empty don't dilute the fraction, though deductions you'd be entitled to regardless of the rental sit outside this proration entirely (280A(e)(2)).
Dr. Patel's cabin
Dr. Patel buys a mountain cabin and rents it 180 days at fair rental, which sets her personal allowance at 18 days. The family then takes a week at Thanksgiving and 12 days over spring break.
Item | Days |
Rented at fair rental | 180 |
Personal allowance (greater of 14 or 10% of 180) | 18 |
Personal days actually used | 19 |
Total days used | 199 |
She's over by one, and two things follow:
The unit is a residence for the year, so her deduction is capped at rental income and the loss she was counting on becomes a carryforward
Her rental expenses are prorated at 180 over 199, roughly 90%, rather than deducted in full
One day did that. The fix was available in October and cost nothing, which is why we'd rather look at a booking calendar in the fall than a stack of receipts in April.
The deductions you do get have their own reckoning later, and the sale is where that lands. See Depreciation Recapture on Rental Property for what comes back when you sell.
Does your state follow the same rules?
Usually, but not automatically, and the exceptions are worth checking before you rely on them.
Most states begin their calculation from federal adjusted gross income or federal taxable income. A deduction already capped by section 280A on your federal return therefore arrives at the state return already capped, and the day count does the work in both places.
The complication is conformity. States adopt federal code changes on either a rolling or a static basis. Static states can sit on an older version of the Internal Revenue Code until their legislature updates it (Tax Foundation).
A handful of states don't start from a federal figure at all, which puts them further from the federal answer still.
Two practical consequences follow:
Your state carryforward may not equal your federal carryforward if the state decoupled from a provision feeding into it.
A property in one state, owned by a physician living in another, puts two sets of rules in play at once.
None of that changes how you count the days, which is the point of tracking them. It does change who needs to see the count, so raise the state question with your tax team rather than assuming the federal answer travels.
Does passing the short term rental tests cover you here?
No. Both sets of rules apply to the same property, and they ask different questions.
Section 469 is the one behind the seven day average and the material participation tests, and it decides whether your loss is passive or not. Section 280A is what you've just read, and it decides how much you're allowed to deduct once the property is used as a residence.
Passing the tests in one statute doesn't excuse you from the other, so put the day count on the same checklist as the hours log. They're tracked the same way, and they're lost the same way, by going unrecorded until the year is over.
How do you keep the count clean?
Three habits, all of them cheap during the year and impossible in April.
Track personal nights in the same calendar as guest nights, so the running total stays visible instead of being reconstructed at filing time.
Decide the family's allowance in January, once you have a realistic rental forecast, and treat it as a budget rather than a discovery.
Price friends and family stays at fair rental, or book them knowing the day counts.
Keep the supporting records alongside the calendar. You want booking platform statements, the rate charged for every stay including family stays, and contemporaneous notes for any repair day you intend to exclude. A day count reconstructed after year end is worth considerably less than one kept as you go.
A generalist preparer usually raises the day count as a question in March, which is the right question at the wrong time. None of this is complicated, but it's decided nine months before anyone opens the return.
Doc Wealth is physician founded, and our elite team CPAs, and Enrolled Agents does proactive, year round tax planning. That means the booking calendar gets looked at while you can still change it.
Contact your tax team today. Prompt, dependable communication.
Based on current federal law as of August 23, 2026. Rules and annual figures change.
State conformity varies and changes with each legislative session. Confirm your state's position before relying on it.
Hypothetical examples are for illustration only and individual results differ.
Whether a given day counts as personal use depends on your specific facts. Outcomes are not guaranteed.
Doc Wealth provides tax planning, preparation, bookkeeping, and payroll. Nothing here is investment advice.
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This material is intended for educational and informational purposes only and does not constitute tax, legal, accounting, or financial advice. The content is general in nature and may not apply to your specific circumstances. Tax laws and financial regulations are subject to change and interpretation, and the application of these laws can vary based on individual situations. Before making any decisions, you should consult with a qualified tax advisor, legal counsel, or financial professional.
