Section 280A: Home Office, Vacation Homes, and the 14-Day Rule

Section 280A of the Internal Revenue Code disallows deductions tied to a home you use as a residence, then carves out two narrow exceptions that drive the Section 280A home office and vacation home deductions: business use of part of the home, and rental of the whole property. For a home office, you have to prove a specific space is used exclusively and regularly for business. For a vacation or second home, what you can deduct turns almost entirely on how many days you use it personally versus how many days you rent it at fair market value. Both areas draw heavy IRS scrutiny because personal living costs and deductible business or rental costs sit right next to each other.

Who Qualifies for a Home Office Deduction

Two threshold tests come first. The exclusive use test means a specific, identifiable area of your home is used only for your trade or business. A desk in the corner of the living room where your kids also do homework fails. The space doesn’t have to be a separate room, but it has to be clearly defined and free of personal activity.¹

The regular use test requires that you work in the space on a continuing basis throughout the year. No specific hour count is set, but sporadic use won’t qualify.²

Clearing both tests gets you to the functional requirement. There are three ways to satisfy it.

Principal Place of Business

Your home office qualifies as your principal place of business if the most important revenue-generating work happens there. Even if you also work at client sites, the home office still qualifies as long as it’s where you exclusively and regularly handle administrative and management tasks (billing, bookkeeping, ordering supplies, scheduling) and you have no other fixed location where you do that work.² A self-employed contractor who spends all day at job sites but runs the business side of things from a dedicated home office meets this test. You do not need to meet clients at home under this path.

Meeting Clients or Customers at Home

A second path applies if you use part of your home exclusively and regularly to meet with patients, clients, or customers in the normal course of your business. A therapist who sees patients in a home office, or an attorney who regularly takes client meetings there, qualifies even if the home isn’t the principal place of business. The meetings have to be a routine part of how you do business, not a rare occurrence.³

Separate Structures

A structure that isn’t attached to your home (a detached garage converted into a studio, a standalone workshop) qualifies under its own, more flexible rule. It has to be used exclusively and regularly in connection with your trade or business, but it doesn’t need to be your principal place of business or a place where you meet clients.¹

Two Exceptions to Exclusive Use

Two activities get a pass on strict exclusive use. If you sell products at retail or wholesale and store inventory or product samples at home, you can deduct expenses for the storage area even if it doubles as personal space, provided your home is the only fixed location of the business and the storage happens regularly.⁴

Licensed daycare providers get the second exception. If you run a licensed daycare out of your home for children, elderly individuals, or people with disabilities, you can deduct expenses for the areas used in that business even though the same rooms serve personal purposes at other times. You must hold or have applied for the required state or local license, and the deduction is prorated based on the hours the space is actually used for daycare during the year.⁴

Employees Cannot Claim It

If you’re a W-2 employee, the home office deduction is not available. The Tax Cuts and Jobs Act eliminated it for unreimbursed employee expenses starting in 2018, and the One Big Beautiful Bill Act of 2025 made that elimination permanent.⁵ Self-employed individuals, including independent contractors and sole proprietors, still claim the deduction on Schedule C.³

Two Ways to Calculate the Deduction

Once you qualify, you pick between two methods each year. The choice isn’t permanent; you can switch from one year to the next.

Actual Expense Method

Reported on Form 8829, the actual expense method requires you to track every household cost and split it between business and personal use. Direct expenses benefit only the business space and are fully deductible: painting the office, built-in shelving for business files, a dedicated business phone line.

Indirect expenses benefit the entire home and get allocated, usually by square footage. If your office is 200 square feet in a 2,000-square-foot house, 10% of utilities, homeowner’s insurance, general repairs, and security system costs goes toward the deduction.⁴

Mortgage interest and property taxes get special treatment. You can already deduct them on Schedule A, but the business-use portion moves to Form 8829 and becomes a direct business deduction. That reclassification is often more valuable because business deductions reduce self-employment income, which lowers both income tax and self-employment tax.

Depreciation on the home itself is part of the actual expense calculation. You depreciate the business percentage of the home’s adjusted basis (excluding land) over 39 years, straight-line.⁶ It’s a meaningful annual deduction, but it comes back to bite at sale.

Simplified Method

The simplified method lets you skip the tracking. Multiply the square footage of your office (up to 300 square feet) by $5, for a maximum deduction of $1,500 a year.⁷

The trade-offs matter. No depreciation is allowed. Mortgage interest and property taxes stay on Schedule A in full rather than being reclassified as business expenses. If you use the office for only part of the year, you have to average the monthly square footage, counting only months where you had at least 15 days of qualifying use.⁸ If your actual expenses (including depreciation) meaningfully exceed $1,500, the tracking is worth it.

The Income Cap

Under either method, the home office deduction can’t create or increase a business loss. Your deduction is capped at the gross income from the business use of the home, minus other business deductions unrelated to the home. Under the actual expense method, blocked amounts carry forward to the next tax year. Under the simplified method, blocked amounts are lost for good.⁸

What Happens When You Sell

Section 121 generally lets you exclude up to $250,000 of gain ($500,000 for married couples filing jointly) when you sell your primary residence.⁹ If your home office sat within the living area of the house, you don’t have to carve out the business portion as a separate sale. The entire gain is eligible for the exclusion.¹⁰

The catch is depreciation recapture. Any depreciation you claimed (or were allowed to claim) after May 6, 1997 can’t be excluded under Section 121. That amount is taxed as unrecaptured Section 1250 gain at a maximum rate of 25%, regardless of your regular capital gains rate.¹¹

In practice: claim $12,000 in depreciation over the years, sell the home for a $200,000 gain, and you exclude $188,000 under Section 121 and pay tax on the $12,000 at up to 25%. If you used the simplified method and never claimed depreciation, this recapture doesn’t apply.¹⁰

Vacation Homes: How Personal Use Changes Everything

Section 280A’s rental provisions govern what happens when you rent out a dwelling you also use personally. The first question is how long you rent it.

The 14-Day Rule

Rent your property for fewer than 15 days during the year and the rental income is entirely tax-free. You don’t report it. You also can’t deduct any rental expenses, though you can still claim mortgage interest and property taxes as regular itemized deductions on Schedule A.¹² This rule applies regardless of how much you use the property yourself. Owners in cities that host major annual events sometimes collect thousands in short-term rental income and owe nothing.

What Counts as a Personal Use Day

Cross the 14-day rental threshold and personal-use days become the critical variable. A personal use day includes any day the property is used by you, a family member (spouse, siblings, parents, children, grandchildren), anyone with an ownership interest, or anyone paying less than fair market rent. Home-swap arrangements with another owner count as personal use too.³

Days spent substantially full-time on repairs and maintenance do not count as personal use. A weekend spent fixing the plumbing and repainting a room isn’t a personal use day. A weekend spent fixing one leaky faucet and then relaxing by the pool probably is.

The Residence Threshold

Your property is classified as a “residence” if you use it personally for more than the greater of 14 days or 10% of the days it’s rented at fair market value.¹²

Rent your beach house for 200 days and the 10% figure is 20 days, so you can use it personally up to 20 days before triggering residence status. Rent it for only 100 days and the 10% figure is 10 days, but the 14-day floor applies, giving you 14 days of personal use. Which side of this line you land on determines which set of deduction rules governs.

When the Property Is a Residence

Above the threshold, two things happen: expenses must be allocated between rental and personal use, and rental deductions can’t produce a loss.

The Three-Tier Deduction Order

Rental expenses must be deducted in a mandatory order:

Tier 1: the rental portion of mortgage interest and property taxes comes off first. These expenses would be deductible on Schedule A anyway, so the statute requires them to absorb rental income before anything else.
Tier 2: the rental share of operating costs (utilities, insurance, repairs, similar items) is deducted next, but only to the extent rental income remains after Tier 1.
Tier 3: the rental share of depreciation is deducted last, from whatever rental income survives Tiers 1 and 2.

If Tier 2 or Tier 3 expenses exceed the remaining rental income, the excess carries forward. Total rental deductions across all three tiers cannot exceed gross rental income; the activity has to break even or show a small profit. That’s the anti-abuse core of Section 280A for residences. You can’t use a vacation home that doubles as a personal getaway to generate paper losses that shelter your salary.³

Bolton vs. the IRS on Allocating Interest and Taxes

How you allocate Tier 1 expenses can move the overall result. The IRS position: allocate all expenses, including interest and taxes, using rental days divided by total days used (rental plus personal). The Tax Court, in Bolton v. Commissioner (77 T.C. 104, 1981), held that interest and taxes accrue daily throughout the year, so the rental share for those items should be calculated as rental days divided by 365. Both methods use rental days divided by total days used for operating expenses and depreciation.

The Tax Court method is more favorable. Dividing by 365 instead of a smaller number gives interest and taxes a lower rental allocation, which leaves more of those costs available as itemized deductions on Schedule A and frees up more rental income to absorb Tier 2 and Tier 3 deductions. The IRS has not acquiesced to Bolton, but taxpayers using the Tax Court method have case law behind them.

When Personal Use Stays Under the Threshold

If your personal use is at or below the greater of 14 days or 10% of rental days, the property isn’t a residence, and the zero-out rule doesn’t apply. Rental activity can produce a deductible loss. You still allocate expenses between rental and personal use when any personal days exist, based on rental days over total days used.³

Section 280A allowing a loss doesn’t mean you get to deduct it freely. Rental real estate is a passive activity under Section 469, so losses generally only offset other passive income. One important exception: if you actively participate in managing the rental (decisions about tenants, repairs, lease terms) and your AGI is below $150,000, you can deduct up to $25,000 of rental losses against ordinary income each year. That $25,000 allowance phases out by 50 cents for every dollar of AGI over $100,000 and disappears at $150,000.¹³

Losses you can’t use in the current year carry forward against future passive income, or are fully deductible when you sell the property. Real estate professionals who materially participate in each rental activity escape the passive activity rules entirely.

Records and Audit Risk

Section 280A claims draw a lot of IRS attention, and the burden of proof is on you. You need to be able to show which part of your home serves as the office, that you used it exclusively and regularly for business, and that you have documentation for every expense you deducted.⁶

For a home office, keep a floor plan or diagram showing the dedicated business area and its square footage. Retain receipts, canceled checks, and bank statements for utilities, insurance, repairs, and mortgage payments. If you claim depreciation, keep records of your home’s original cost basis and any improvements. For a rental property, keep a calendar or log showing which days it was rented, which days you used it personally, and which days went to maintenance. Rental agreements, fair-market-value documentation, and expense records should be preserved for at least three years after filing.

If the IRS disallows the deduction, the underpayment can trigger an accuracy-related penalty of 20% on top of the tax owed. The penalty applies when the IRS finds you were negligent or substantially understated your tax liability, which it defines as an understatement of at least 10% of the correct tax or $5,000, whichever is greater.¹⁴ Contemporaneous records are the strongest defense if your return gets examined.

1
Internal Revenue Service. Topic No. 509, Business Use of Home
2
Internal Revenue Service. Office in the Home – Frequently Asked Questions
3
Office of the Law Revision Counsel. 26 USC 280A
4
Internal Revenue Service. Instructions for Form 8829 (2025)
5
Tax Policy Center. How Did the TCJA and OBBBA Change the Standard Deduction and Itemized Deductions
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Internal Revenue Service. Publication 587 (2025), Business Use of Your Home
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Internal Revenue Service. Simplified Option for Home Office Deduction
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Internal Revenue Service. FAQs – Simplified Method for Home Office Deduction
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Office of the Law Revision Counsel. 26 USC 121
10
Internal Revenue Service. Publication 523, Selling Your Home
11
Internal Revenue Service. Topic No. 409, Capital Gains and Losses
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Internal Revenue Service. Topic No. 415, Renting Residential and Vacation Property
13
Office of the Law Revision Counsel. 26 USC 469 – Passive Activity Losses and Credits Limited
14
Internal Revenue Service. Accuracy-Related Penalty