Short-Term Rental Personal Use Rules. The IRS Section 280A Tax Guide Every STR Investor Needs in 2026

Here is the thing most short-term rental investors get wrong about their own tax situation: they think about days in terms of how long a stay feels. A long weekend here, a week over the holidays, maybe a few days to check on the place in spring. What they do not think about is the moment a single extra personal use day quietly reclassifies their rental property in the eyes of the IRS, stripping away deductions they have been counting on all year.

That is not a hypothetical. Under IRS Section 280A, personal use days above a specific threshold trigger a completely different set of tax rules for your short-term rental. The switch does not happen gradually. You are either below the line or above it, and the financial difference between those two positions can run into thousands of dollars in deductions that disappear.

Q4 is when this matters most. Between Thanksgiving, Christmas, and the temptation to use your mountain cabin or beach house one more time before the new year, STR investors make personal use decisions in October through December that will be locked in on December 31. At that point, there is nothing a tax professional can do to change the outcome.

This guide walks through exactly how Section 280A works, what counts as personal use, the three tax classifications that determine your deduction rights, and the year-end planning framework every STR investor should run before taking those final personal use days.

This article provides general information and should not be construed as legal advice. Consult a qualified tax professional in your jurisdiction for advice specific to your situation.

What Is IRS Section 280A and Why Does It Apply to Your STR?

Section 280A of the Internal Revenue Code governs the tax treatment of dwelling units used for both rental and personal purposes. Congress enacted it to close a specific loophole: wealthy taxpayers were deducting losses from properties that functioned primarily as personal vacation homes, offsetting income from other sources. Shocked that Congress once had to close a tax loophole exploited by the wealthy? Neither am I. The provision draws a line between a legitimate rental business and what the IRS views as a personal asset with occasional rental income.

For short-term rental investors, Section 280A is the primary rule that determines whether your property files on Schedule E as a rental business (with all the deductions that implies) or falls into the more restrictive “vacation home” category where deductions are capped and net losses are prohibited. IRS Publication 527 (Residential Rental Property) is the agency’s plain-language explanation of how these rules apply, and it is worth reading directly for the authoritative version.

The key question Section 280A asks is straightforward: how many days did you personally use this property relative to how many days you rented it at fair market price? Your answer to that question puts you in one of three categories, each with distinct tax treatment. The guide to the IRS 14-day rule covers the classification framework in depth; this article focuses on what happens to your deductions once you have crossed the threshold, and how to manage the day count before year-end.

What Exactly Counts as Personal Use

Before you can apply the 280A rules, you have to know what the IRS counts as a personal use day. The definition is broader than most investors expect.

A day counts as personal use under Publication 527 when the dwelling is used by:

• You or any co-owner, unless you rent it to another owner as their main home under a shared equity financing agreement (IRS Publication 527)
• A family member of any owner or co-owner, including a spouse, siblings, half-siblings, parents, grandparents, children, and grandchildren, unless that family member uses the property as their primary residence and pays a fair market rental price
• Anyone under a reciprocal use arrangement, meaning you allow someone to use your property in exchange for access to theirs
• Anyone paying less than fair market rental price, regardless of their relationship to you

Picture this: You let your sister-in-law stay at your beach house for a week because she is between apartments. She pays nothing, or she pays you a token amount as a favor. That week counts as personal use, full stop. You did not have to be there. The property being occupied below fair market rent is enough.

There is one meaningful exception that surprises investors who maintain their own properties: days you (or someone you hire) spend substantially full-time on repairs and maintenance do not count as personal use days. The key word is “substantially.” Stopping by for a few hours to fix a faucet and then staying overnight is not a maintenance day. A day spent entirely on repair work qualifies for the exception, even if family members use the property for recreational purposes on the same day (IRS Publication 527).

This exception matters particularly for investors who self-manage and spend meaningful time on physical upkeep. Document those days carefully with receipts, photos, and a log. If you ever need to defend your day count, the records will earn their weight.

The Three Tax Tiers: How 280A Classifies Your Property

Once you know your personal use day count and your rental day count, Section 280A puts you in one of three categories. The categories are not gradual. They are hard thresholds.

Tier 1: Primarily Rental Property

If your personal use days stay at or below the greater of 14 days or 10% of the days you rented the property at fair market price, your property is treated as a genuine rental under Schedule E.

What does that actually mean for the numbers? If you rented your cabin for 120 days this year, 10% of 120 is 12. Fourteen is greater than 12, so your threshold is 14 days. You could take up to 14 personal use days and remain in Tier 1. If you rented for 200 days, 10% of 200 is 20, which is greater than 14. Your threshold is now 20 days.

In Tier 1, you report all rental income, and you can deduct all ordinary and necessary rental expenses. More importantly, if your deductible expenses exceed your rental income, you have a net rental loss. That loss may be deductible against other income, subject to the passive activity loss rules (think of these as the IRS’s way of limiting how much real estate paper losses can shelter income from your day job). Whether and how you can use the loss is a separate analysis, but the loss is at least available to work with.

This is the tax position most STR investors want and plan for. Staying in Tier 1 is about managing days, not generating income.

Tier 2: Vacation Home / Mixed Use

Cross the threshold by even one day and the entire tax treatment shifts. If your personal use days exceed the greater of 14 days or 10% of rental days, and you rented the property for at least 15 days during the year, you are in vacation home territory under Section 280A.

Under Tier 2 rules, you still report all your rental income. You can still deduct expenses related to the rental period. But there are two critical restrictions that change the financial picture substantially:

First, your total rental deductions cannot exceed your gross rental income. You cannot create a net rental loss. If your rental income is $24,000 and your allocated rental expenses add up to $31,000, the extra $7,000 does not generate a tax benefit this year. It carries over to the following year (where it faces the same cap again).

Second, deductions must be applied in a specific order. More on this below, but the ordering rule means that depreciation (often worth thousands of dollars as a deduction) typically gets applied last and is the first item to be partially or fully disallowed when the gross income cap hits.

Tier 3: The Augusta Rule (Fewer Than 15 Rental Days)

The Augusta Rule (named, as tax nicknames go, for a certain famous golf tournament in Georgia) applies when you use a property as a home and rent it for fewer than 15 days during the year (IRS Publication 527). Under this provision, the rental income is completely excluded from gross income. You do not report it, and the IRS does not expect to see it on your return.

The tradeoff is that you also cannot claim any rental deductions. Mortgage interest and property taxes for the property would go on Schedule A as personal expenses rather than Schedule E as rental expenses.

For the investor who uses a vacation property primarily personally and rents it occasionally, this is a clean arrangement. For an STR investor whose business model depends on rental income, it is not a realistic category. Most STRs generating meaningful revenue will have well over 14 rental days in a year.

How the IRS Allocates Deductions Under Vacation Home Rules

When your property falls into Tier 2, expenses have to be split between rental use and personal use. IRS Publication 527 provides the formula for this allocation:

Rental percentage = Rental days divided by (Rental days + Personal use days)

Vacant days when the property is neither rented nor used personally do not go into this calculation. That is worth noting because vacant periods are common in STR calendars, and some investors assume they factor into the ratio.

An example makes this concrete. Say you own a lake house that you rented for 90 days and used personally for 20 days. The property sat vacant for the remaining 255 days of the year. Your rental percentage is 90 divided by (90 + 20), which equals approximately 82%. That means 82% of your shared expenses (mortgage interest, property taxes, insurance, utilities, and depreciation) can be allocated to the rental. The remaining 18% is personal and follows personal expense rules.

Now apply the gross income cap and the deduction ordering rule.

The Deduction Ordering Rule: Why Depreciation Gets Hit Hardest

Publication 527 requires vacation home deductions to be applied in a specific sequence. The order:

1. Rental portion of mortgage interest and real estate taxes, plus direct rental expenses (advertising, platform fees, management fees)
2. Operating expenses allocable to rental use: repairs, maintenance, utilities, insurance
3. Depreciation allocable to rental use

The gross income cap applies to the total. If categories 1 and 2 consume most or all of the gross rental income, category 3 (depreciation) gets reduced or eliminated entirely.

Here is why this matters in practice. Depreciation on a rental property is one of the most valuable deductions in the STR tax playbook. For a property purchased at $400,000, the land-excluded depreciable basis might be $320,000. At a 27.5-year straight-line schedule, that is roughly $11,600 in annual depreciation. For an investor in the 32% bracket, that depreciation is worth about $3,700 in tax savings per year, assuming it can actually be deducted.

Under vacation home rules, if your rental income is $28,000 and your mortgage interest plus taxes plus operating expenses already total $26,000 at the rental allocation percentage, your depreciation deduction is capped at the remaining $2,000. The other $9,600 carries over but does not reduce your taxes this year. This is the financial hit that most investors do not fully account for when they think about personal use days.

A Year-End Decision Framework: What to Do Before December 31

The window to manage your 2026 personal use day count closes when the calendar does. Unlike many tax planning strategies that can be executed in January or February before the filing deadline, this one is a real-time operating decision. You cannot retroactively take back a personal use day you have already taken.

Before you book any year-end personal stays, run through this framework:

Step 1: Count Your Days

Pull your rental calendar. Count every day a guest was confirmed in your property at fair market price. Then count every day you, a co-owner, or a family member used the property, plus any days rented below fair market price. Repair days spent entirely on maintenance work (documented) can be removed from the personal use count.

Calculate your threshold. If you rented 130 days, 10% is 13 days, so your threshold is 14. If you rented 160 days, 10% is 16 days, so your threshold is 16. Know the number before you make plans.

Step 2: Know Your Current Position

How many personal use days have you already taken in 2026? The answer tells you how much room you have before you cross the threshold.

If you have already exceeded the threshold, you are in Tier 2 regardless of what you do in Q4. At that point, the analysis shifts: you may as well understand the deduction math you are working with and plan accordingly for next year.

If you are at or under the threshold, every additional personal use day you take before December 31 is a decision with a measurable financial consequence.

Step 3: Estimate What Is at Stake

This is the calculation most investors skip, and skipping it is expensive. Before a personal use stay, estimate:

• Your approximate annual gross rental income
• Your allocated rental expenses (mortgage interest, taxes, operating costs, depreciation)
• Whether you are currently positioned for a net rental loss or roughly breaking even on the rental side

If your property is generating a net rental loss that you can currently deduct (or carry forward under passive activity rules), and crossing the personal use threshold would eliminate that loss, the cost of crossing the line is the tax value of that disallowed loss. For many investors, that calculation comes out between $2,000 and $8,000 depending on their tax bracket and the size of their loss.

That does not mean the personal use stay is never worth it. It means you should make the decision knowing the actual number, not guessing at it in February when it is too late.

Step 4: Consider the Timing of Rental Days Too

The other side of the ledger also matters. If you are close to but not over the threshold, adding rental days before December 31 can shift your threshold upward (since the 10% test is based on rental days). A property rented 140 days has a 14-day threshold. Rented 160 days, the threshold rises to 16. Booking additional year-end inventory, if your market allows it, can create flexibility for personal use.

The StaySTRA Analyzer can help you model occupancy data for your specific market and property type, giving you a realistic picture of what additional rental days are available in Q4. Use that data alongside your day count before making year-end decisions.

What Happens If You Are Already in Vacation Home Territory

If your personal use days for 2026 have already exceeded the threshold, your focus should shift from prevention to understanding your deduction position so you can plan 2027 more effectively.

Key things to know at this stage:

Your disallowed deductions carry over. Any deductions that are disallowed this year because they exceed gross rental income carry forward to next year. They do not disappear permanently. They stay subject to the limits that apply in the later year, even if you do not use the property as your home for that subsequent year (IRS Publication 527).

Document your rental activity rigorously. Under vacation home rules, the IRS scrutinizes these returns more closely. Maintain clear records of all rental days (confirmed reservations, platform booking confirmations), all personal use days (calendar entries, communications), and all expenses with receipts.

Review how your tax preparer is allocating expenses. Some preparers use the total-days-in-year method rather than the IRS’s actual-use-days method when allocating mortgage interest. The total-days method (supported by the 9th Circuit’s decision in Bolton v. Commissioner, 694 F.2d 556 (9th Cir. 1982)) generally allocates a smaller share of mortgage interest to the rental period, which can improve your deductible position modestly (Bolton v. Commissioner). It is worth a conversation with your preparer about which method applies in your circuit and situation.

Think about structuring 2027 intentionally. The vacation home classification is not permanent. It resets every year. A year where you stay under the personal use threshold returns you to Tier 1 and restores full rental business treatment.

For a deeper look at which deductions are available under Schedule E rental treatment (the Tier 1 position), the complete guide to STR tax deductions covers the full list including depreciation, repairs, professional fees, and platform costs. The Schedule E vs. Schedule C analysis breaks down when each filing approach applies and what changes if your STR activity crosses into a trade or business.

A Note on What This Rule Does Not Cover

Section 280A addresses personal use relative to rental use. It is separate from several other IRS rules that STR investors often encounter:

• The 7-day average stay test (Treasury Regulation 1.469-1T(e)(3)(ii)(A)) determines whether your STR activity qualifies as a rental activity for passive loss purposes at all. If your average guest stay is seven days or fewer, the activity may not be classified as a passive rental, which affects how losses can be used.
• Material participation tests determine whether you can use STR losses to offset non-passive income.
• Bonus depreciation rules (restored to 100% under the One Big Beautiful Bill Act for property acquired after January 19, 2025) interact with 280A in a specific way: depreciation is subject to the vacation home gross income cap.

These rules interact, and the combination matters. A tax professional familiar with short-term rental returns is worth the investment if your situation involves any of these layers. For more on the bonus depreciation changes, see the STR bonus depreciation guide.

We do our best to keep our tax guides accurate and up to date, but tax law changes and interpretations evolve, and we are only human. Always verify current rules with a qualified tax professional familiar with short-term rental returns before making business decisions.

The personal use rules under Section 280A are one of the most consequential and least-understood elements of STR tax planning. Most investors find out about the threshold after they have already crossed it, which means they discover the deduction limitation at the same time they discover it is too late to change the outcome. Running the numbers now, before the year closes, is the version of this analysis that actually helps.

The StaySTRA Analyzer gives you market-level occupancy and revenue data to benchmark your rental day count and understand where your property stands relative to comparable listings. Use that data alongside your day count to build a year-end position you chose intentionally, not one that happened to you.