Updated
What qualifies for the home office deduction?
A part of your home generally qualifies if you use it both regularly and exclusively for your business and it meets one of the qualifying-use tests. IRS Publication 587 spells out each piece.
- Exclusive use: "you must use a specific area of your home only for your trade or business." Publication 587 adds that "the space does not need to be marked off by a permanent partition." A guest room that doubles as your office, or a dining table you clear each evening, generally fails.
- Regular use: "you must use a specific area of your home for business on a regular basis. Incidental or occasional business use is not regular use."
- A qualifying use: the space is your principal place of business, a place where you meet clients or customers in the normal course of business, or a separate structure not attached to your home (such as a studio or detached garage).
Two uses can qualify without exclusive use, each with its own conditions: storing inventory or product samples (if you sell products at wholesale or retail and your home is your business's only fixed location) and running a qualifying daycare. "Home" is broad: Publication 587 includes a house, apartment, condominium, mobile home or boat, and structures on the property.
Does my home office count as my principal place of business?
It usually does if it's where you do the administrative or management work of the business and you have no other fixed location for that work. Publication 587 says your home office qualifies if you use it "exclusively and regularly for administrative or management activities" of the business and you have "no other fixed location where you conduct substantial administrative or management activities."
Administrative work includes billing clients, keeping books and records, ordering supplies, setting up appointments, and writing reports. Publication 587's example is a plumber who works mostly at customers' homes but does the estimates, ordering and bookkeeping in a home office: the office qualifies.
Some things don't disqualify you, according to Publication 587: doing admin work in a car or hotel room, occasionally doing minimal admin work somewhere else, having someone else do your billing, or seeing clients at a separate location.
A qualifying home office has a second benefit: Publication 463 says that when your home is your principal place of business, daily trips between home and another work location in the same business are deductible rather than commuting. The 2026 mileage deduction guide explains the split mileage rate.
Simplified or regular method: which is better?
It depends on your costs and how much record-keeping you want; many people figure both. The simplified method is quick and capped. The regular method is usually larger for a big space or an expensive home, but takes more paperwork.
| Simplified method | Regular method | |
|---|---|---|
| How it's figured | $5 × business square footage, up to 300 sq ft | Business percentage × actual home expenses, plus direct expenses for the office |
| Maximum | $1,500 | No set cap |
| Form | Simplified Method Worksheet in the Schedule C instructions; square footage entered on Schedule C line 30 | Form 8829, total carried to Schedule C line 30 |
| Depreciation | None; treated as zero for that year | Yes, for the business part of a home you own |
| Mortgage interest and property taxes | Treated as personal (itemize them as usual) | Business share included on Form 8829 |
| Amounts over the income limit | Earlier regular-method carryovers can't be used in a simplified year; they wait for the next regular-method year | Carried over to the next year |
| Records | Measurements and proof of use | Measurements, proof of use, and every bill |
Both methods share a limit: the deduction can't be more than the gross income from the business use of your home, minus your other business expenses. Under the regular method, Publication 587 says the business percentage can be found by any reasonable method, commonly the office's area divided by the home's total area.
Publication 587 also explains that you choose each year: "an election for a tax year, once made, is irrevocable," but switching methods the next year is allowed. Depreciation you claim under the regular method matters when you sell the home, which Publication 587 covers in its section on selling a home used partly for business. That's a good question for your CPA if you own your home.
Example: comparing the two methods
Example (fictional numbers): Lena is a freelance illustrator who rents a 1,200-square-foot apartment. She uses a 180-square-foot room only for her work, every working day, and has no other office. That's 15% of the apartment (180 ÷ 1,200).
| Simplified | Regular | |
|---|---|---|
| Calculation | 180 sq ft × $5 | 15% × ($26,400 rent + $2,400 utilities + $240 renters insurance) |
| Result | $900 | $4,356 |
For Lena, a renter with no depreciation to worry about, the regular method produces the larger figure, as long as her business income is high enough to absorb it. If she used only 300 square feet or less and wanted to skip collecting a year of bills, the simplified method would still be available. She brings both calculations and her records to her CPA, who decides which to file.
Is the home office deduction a red flag?
Honestly, we can't tell you it is, and we won't make up a number. We have not found an IRS statement that claiming the deduction raises your audit risk. What the IRS does publish is the test and the records it expects. If your space meets the regular-and-exclusive-use test and you keep records that show it, Form 8829 and Schedule C have lines for it.
So check the facts rather than worrying about the form: is the room also a guest bedroom? Is your real principal place of business a rented office elsewhere? Did you actually measure the square footage? If any answer gives you pause, talk it through with your CPA before claiming it.
What records do I need for a home office?
Publication 587 says your records must show the part of your home you use for business, that you use it exclusively and regularly as your principal place of business or to meet clients, and the depreciation and expenses for the business part. Keep:
- a floor plan or measurements of the office and the whole home,
- photos of the space set up for work,
- for the regular method, rent receipts or mortgage interest and property tax statements, utility bills, insurance and repair receipts, and
- if you own, records of the purchase price and improvements, which you keep as long as they matter for any tax return.
Publication 587 also notes the first landline into your home is a personal expense; a second line used only for business is deductible. For the rest of your write-offs, see the self-employed tax deductions list and Schedule C expense categories.
Where Amy fits
A home office never shows up as one charge; it is spread across rent, utilities and insurance. Amy finds the expenses that never appear as a single line in the records you already have, and asks you what only you know. Whether your space qualifies is your call and your CPA's.
