Real Estate Tax Calc
The 14-day / 10% test
A dwelling is treated as a residence if your personal use exceeds the greater of 14 days or 10% of the days it is rented at fair value. Cross that line and your deductions against rental income are limited — you generally cannot deduct a rental loss.
Splitting expenses
When there is both personal and rental use, you allocate expenses between the two. The rental share of mortgage interest, property tax, insurance, utilities, and depreciation is deductible against rental income; the personal share may be deductible only as an itemized deduction where allowed.
Three buckets to know
Rented fewer than 15 days: income is tax-free (the Augusta Rule). Mostly rental with little personal use: treated as a rental, losses may be allowed subject to passive rules. Mostly personal: treated as a residence, deductions capped at rental income. Track every night of use to land in the right bucket.
A worked example of expense allocation
You own a lake house, use it 30 personal days, and rent it 120 days at fair value (150 total use days). Because 30 personal days exceed the greater of 14 days or 10% of 120 (12 days), it's a residence, so rental deductions can't create a loss. Suppose full-year costs are $12,000 interest, $4,000 taxes, $6,000 operating expenses, and $9,000 depreciation. Under the IRS method the rental share is 120/150 = 80%. You deduct rental expenses only up to rental income, in a set order, and carry forward any disallowed amount; the personal 20% of mortgage interest and property tax may be itemizable on Schedule A.
The order deductions must follow
When the property is a residence, deductions against rental income stack in a fixed sequence and stop once income is used up: first the rental share of otherwise-allowable items like mortgage interest and property taxes; second operating expenses such as utilities, insurance, and repairs; third depreciation. Depreciation comes last precisely because it's a non-cash deduction — you'd rather use cash costs against income first. Anything disallowed because it exceeds rental income carries forward to future years, subject to the same limitation.
Two allocation methods — and why interest is the battleground
The IRS method allocates every expense by rental days ÷ total days used. Several courts (the Bolton and McKinney cases) allow mortgage interest and property taxes to be allocated by rental days ÷ 365 instead, because those costs accrue all year. The court method assigns a smaller share of interest and taxes to the rental — leaving more rental income to absorb operating costs and depreciation, and more interest and taxes to deduct on Schedule A. Taxpayers often prefer it, but it remains an area of disagreement; discuss it with your preparer before relying on it.
What counts as a personal-use day
A personal-use day includes any day the home is used by you, co-owners, or family members (spouse, siblings, parents, children, grandchildren), a day rented to anyone at less than fair market rent, and a day given away as charitable use or through a reciprocal-use arrangement. Days you spend substantially full-time repairing and maintaining the property do not count as personal use, even if family is present. A day rented at fair value to an unrelated party is a rental day, not personal — track each night deliberately, because the classification drives the whole outcome.
The three categories in depth
Rented under 15 days (§280A(g)): income is tax-free and no rental expenses are deducted — the Augusta Rule. Rental use with minimal personal use (personal days at or below the 14-day/10% threshold): it's a rental on Schedule E, and losses may be allowed subject to the passive activity rules. Personal residence with significant rental (personal use over the threshold): deductions are capped at rental income under §280A. Separately, if you rent without a genuine profit motive, the hobby loss rules of §183 can apply. Knowing your category before year-end lets you shift a few days of use to land where you want.
Selling, converting, and the home-sale exclusion
If you convert the vacation home to a primary residence and later sell, the Section 121 exclusion ($250,000 single / $500,000 married) is reduced for periods of non-qualified use — time it was a rental or second home after 2008 — so the gain is prorated between qualifying and non-qualifying periods. Depreciation claimed after May 6, 1997 is recaptured and can't be excluded regardless. If you sell it as a rental, a 1031 exchange may defer gain, but personal use can jeopardize exchange treatment; the IRS safe harbor (Rev. Proc. 2008-16) limits personal use to 14 days (or 10% of rental days) per year in the two years surrounding the exchange.
Short-term rentals and the material-participation angle
If average guest stays are seven days or fewer, the activity isn't a 'rental' under the passive activity regulations — it's treated more like a business. Combined with material participation, losses can be non-passive and offset active income, even without real estate professional status (the so-called short-term rental strategy). But the §280A personal-use limitation still applies independently: if your personal use makes the dwelling a residence, deductions remain capped at income no matter how the passive rules classify the activity. The two rule sets operate in parallel, and you must satisfy both.
Recordkeeping: log every night
Because a handful of days can flip your property between 'residence' and 'rental,' contemporaneous records are essential. Keep a calendar marking each night as personal, family, rented-at-fair-value, rented-below-market, repair, or vacant. Save rental agreements, listing records, and receipts, and note who used the home and what they paid. For repair days you're excluding from personal use, keep proof that you worked substantially full-time — receipts, photos, contractor coordination. Reconstructing this at tax time invites error and, on audit, doubt. A simple spreadsheet updated through the year is your best defense.
Selling a property used purely as a rental
If the vacation home has been a true rental (personal use below the threshold), selling it follows ordinary rental rules: gain is capital gain, prior depreciation is recaptured as unrecaptured §1250 gain (up to 25%), and high earners may owe the 3.8% net investment income tax on the gain. There's no Section 121 exclusion because it isn't your principal residence. A 1031 exchange can defer the entire tax if you reinvest in like-kind real estate and observe the personal-use safe harbor, making it a common exit for appreciated vacation rentals.
State, local, and occupancy taxes
Federal income tax is only part of the picture. Most states with an income tax follow the federal rental rules, but confirm conformity — a few diverge on depreciation or the court allocation method. Separately, short-term vacation rentals usually owe state and local lodging or occupancy taxes, and many municipalities require permits or limit short-term rentals entirely. Platforms like Airbnb collect some of these automatically in certain jurisdictions, but the legal responsibility remains yours. Budget for these taxes and check local ordinances before listing.
Repairs, improvements, and safe harbors
The same repair-versus-improvement rules that govern any rental apply to the rental share of a vacation home. Routine repairs (fixing a faucet, repainting a room) are deducted currently within the §280A limitation; improvements are capitalized and depreciated. The de minimis safe harbor (generally up to $2,500 per item or invoice) and the small taxpayer safe harbor can let you expense smaller amounts rather than capitalizing them, simplifying the paperwork on a mixed-use property. Allocate every cost between rental and personal use first, then apply these rules to the rental portion.
Common vacation-home mistakes
The recurring errors are predictable. Investors miscount days — forgetting that family stays and below-market rentals are personal use — and unexpectedly trip the residence threshold. They fail to allocate expenses between rental and personal use, deducting 100% of costs the IRS will only allow in part. They overlook the deduction ordering and depreciation carryforward when the property is a residence. And they ignore occupancy taxes and local permit rules for short-term stays. The fix is boring but effective: log every night, allocate every dollar, apply the §280A limitation in order, and check local ordinances before listing. A little discipline through the year prevents a painful reconstruction at filing time.
Frequently asked questions
What counts as a personal-use day?
Use by you, family members, or anyone paying less than fair rent. Days spent substantially full-time on repairs generally do not count.
Can I deduct a loss on a vacation rental?
Not if personal use makes it a residence — deductions are then capped at rental income. A true rental may allow losses subject to passive activity rules.
What if I rent fewer than 15 days?
Then the income is tax-free under Section 280A(g) and you do not deduct rental expenses for those days.
Which allocation method should I use?
The IRS method (rental days ÷ total use days) is the default and least likely to be challenged. The court-approved method allocates interest and taxes over 365 days, which often benefits the taxpayer, but it's contested — weigh it with a tax advisor before relying on it.
Do repair days count against my personal-use limit?
No. Days you spend substantially full-time on repairs and maintenance don't count as personal use, even if family members are also there for the trip, as long as your principal purpose that day is the work.
Can I still deduct a loss if it's classified as a rental?
Possibly. If personal use stays at or below the 14-day/10% threshold it's a rental, and losses may be deductible subject to the passive activity loss rules and the $25,000 active-participation allowance.
How do I sell a vacation home for the best tax result?
If it's a pure rental, a 1031 exchange can defer capital gain and depreciation recapture. If you convert it to a principal residence and live there long enough, part of the gain may qualify for the Section 121 exclusion, though non-qualified-use periods and prior depreciation limit it.
Do I owe occupancy or lodging taxes on short-term rentals?
Usually yes. Most states and many localities impose lodging or occupancy taxes on short-term stays, and some require permits. Booking platforms collect these in some jurisdictions, but the ultimate responsibility is the owner's — check local rules before listing.
What's the most common vacation-home tax mistake?
Miscounting personal-use days — especially forgetting that family stays and below-market rentals count as personal use — which unexpectedly turns the property into a residence and caps deductions at rental income. Log every night by category to avoid it.
Sources
Educational information and estimates only. Not tax advice. Tax rules change and vary by situation; consult a qualified tax professional before acting.