Vacation Home Rental Rules: Personal Use, Allocation and Loss Limits

By Tom, CPA · Updated October 27, 2026

Part of: Rental Property Taxes

TL;DR: A vacation home you both rent and use falls into one of three buckets: rented fewer than 15 days (rent is tax-free), used as a home (personal use over the greater of 14 days or 10% of rental days, so rental deductions are capped at rental income), or a rental with some personal use (expenses allocated, losses subject to passive rules). How you allocate mortgage interest and taxes, IRS method or Bolton method, can change the total deductions.

Educational only, not tax, legal, or investment advice. Examples are illustrations, not predictions. Rules and limits change; verify current figures and talk to a qualified professional about your situation.

Your tenant pays the mortgage; the IRS pays for the roof over 27.5 years. With a vacation home, you are sometimes the tenant, and the IRS gets fussy about who pays for what on which days.

Section 280A and chapter 5 of Pub. 527 govern dwelling units with both personal and rental use. The rules decide whether rent is taxable at all, what share of expenses is rental, and whether a rental loss is allowed. Most surprises come from miscounting personal use days, so we start there, then cover the three categories, the allocation formulas including the Bolton method, loss limits, and a worked example comparing results.

CPA Warning Label: One extra weekend at the lake can flip your vacation home from "rental with losses" to "home with capped deductions." Count personal days like they cost money, because they do.

Personal use day definition

Pub. 527 says a day of personal use is any day the unit is used by:

1. You or any other person who owns an interest in it (with an exception for shared equity financing agreements).
2. A member of your family or of any co-owner's family, unless the family member uses it as their main home and pays a fair rental price. Family means spouse, siblings, half siblings, ancestors and lineal descendants.
3. Anyone under an arrangement that lets you use some other dwelling unit (a home swap).
4. Anyone at less than a fair rental price.

Other rules:

• Days you spend working substantially full-time on repairs and maintenance are not personal use days, even if family members are there for recreation.
• A day rented at a fair rental price is a rental day for allocating expenses even if you used it that day, but counts as personal use for deciding whether you used it as a home (Pub. 527's beach cottage example).
• Days available for rent but not rented are neither rental nor personal days.
• Donating use of the property to a charity auction makes the buyer's days personal use days.

Fair rental price generally means what an unrelated person would pay, compared with similar properties in the area.

Three categories of mixed use

Pub. 925 confirms that a dwelling unit used for personal purposes for more than the greater of 14 days or 10% of fair rental days is not treated as a passive activity, because category 2's own limits apply instead.

Expense allocation formula (IRS vs Bolton)

IRS method. Pub. 527 divides expenses between rental and personal use based on days used for each: rental share = rental days / (rental days + personal days). Days the property sits empty are ignored. This share applies to all expenses, including mortgage interest and property taxes. Direct rental expenses (platform fees, advertising, rental-only cleaning) are fully rental.

Bolton method. In Bolton v. Commissioner (Tax Court, 1981, affirmed by the Ninth Circuit in 1982), the courts allowed mortgage interest and property taxes to be allocated by rental days divided by all days in the year (365), on the theory that those costs accrue every day regardless of use. Operating expenses and depreciation still use the IRS ratio.

Why it matters in category 2: deductions are applied against rental income in a fixed order (Worksheet 5-1). First, the rental portion of mortgage interest, taxes and casualty losses, plus direct rental expenses. Then operating expenses. Then depreciation. A smaller rental share of interest and taxes under Bolton leaves more room for operating expenses and depreciation against rental income, while the remaining interest and taxes go to Schedule A if you itemize. The IRS has not adopted Bolton in Pub. 527, so using it is a position; it is most common in the Ninth Circuit and should be considered with advice.

Loss limits

• Category 2: rental expenses cannot exceed rental income. Unused operating expenses and depreciation carry forward to the next year's worksheet for that unit. No rental loss is allowed, regardless of income.
• Category 3: a net loss is a passive loss. Actively participating owners may use up to $25,000 under the passive activity rules subject to the MAGI phaseout; otherwise it is suspended. If the average guest stay is 7 days or less, it is not a rental activity under section 469 and material participation decides.
• Interest on Schedule A: the personal share of mortgage interest on a qualified second home can be deductible as home mortgage interest if you itemize, subject to the home mortgage limits; in category 3 with little personal use, the home may not be a qualified residence for that purpose.

Example

Illustration (hypothetical): A lake cabin is rented 60 days at fair rent and used personally 30 days, so it is used as a home (30 is more than the greater of 14 or 6). Rental income $10,000; direct rental expenses $1,000; mortgage interest $9,000; property taxes $3,000; utilities, insurance and repairs $4,500; full-year depreciation $8,000. The owner itemizes.

Both methods show zero net rental income, but Bolton uses more of the operating expenses and depreciation now and leaves more interest and taxes for Schedule A, about $6,000 more total deductions this year in this example. If the owner takes the standard deduction, the Schedule A advantage disappears, and the worksheet instructions direct the rental share of interest and taxes into the later, limited lines instead. Note also that depreciation claimed (or allowable) reduces basis. Numbers are rounded, and the real estate tax portion on Schedule A remains subject to the state and local tax deduction cap.

Planning tips

• Track personal days on a calendar as carefully as rental days.
• Do maintenance trips on full workdays and document them so those days are not personal use.
• Charge family fair rent if you want those days to count as rental, and only if they use it as their main home does that help the personal use test.
• Consider the category before booking that extra family week in December.
• Selling later? Depreciation affects gain, and a vacation home generally does not qualify for the home sale exclusion unless it was your main home for the required period; see the section 121 exclusion. A 1031 exchange of a vacation home has its own safe harbor rules; see 1031 for vacation homes.