The Home Office Deduction for the Self-Employed: Simplified vs Regular Method
A self-employed person who works from home can deduct part of the cost of the home, but the rule is written as a prohibition with exceptions: §280A begins by disallowing any deduction for a dwelling unit used as a residence, then carves out the cases in which part of it may be treated as a business expense. The exceptions are narrow on qualification and generous in what they cover once met. This guide sets out the qualifying tests, the two methods of computing the deduction, the limit that applies to both, and — because the deduction goes on Schedule C — why it is worth more per dollar than most other deductions available to a freelancer.
Who qualifies
The part of the home must be used regularly and exclusively for business, and it must be one of the following (§280A(c)(1)):
- the principal place of business for the trade or business;
- a place where the taxpayer meets patients, clients or customers in the normal course of business; or
- a separate structure not attached to the dwelling, used in connection with the business.
"Principal place of business" includes a space used for the administrative or management activities of the business when there is no other fixed location where the taxpayer conducts substantial administrative or management activities (§280A(c)(1), final sentence). That sentence, added in 1997, is what lets a plumber or a consultant who does the actual work at clients' premises deduct the room at home where the invoicing, scheduling and bookkeeping are done. The comparison is with other fixed locations of the taxpayer's own business, not with the client's site.
Exclusive use is the test that fails most often. A room that is an office by day and a guest room at the weekend does not qualify; neither does a desk in the corner of a living room that the household also uses, unless the area itself is used for nothing else. The area need not be a whole room or walled off, but it must be identifiable and used only for the business. Two exceptions relax the exclusivity requirement: space used to store inventory or product samples, where the home is the sole fixed location of the business (§280A(c)(2)), and space used as a licensed daycare facility (§280A(c)(4)), which is prorated by hours of use instead.
Employees cannot claim the deduction. Unreimbursed employee business expenses were suspended as miscellaneous itemized deductions from 2018, and Public Law 119-21 made the suspension permanent (§67(g)). A person with a W-2 job and a separate self-employed business can still deduct a home office used for the business, provided the office is used exclusively for that business and not for the job.
The simplified method
Rev. Proc. 2013-13 provides a safe harbor: multiply the square footage used for the business, up to 300 square feet, by $5. The most it produces is $1,500 a year. In exchange for the arithmetic, the taxpayer gives up the actual expenses of the space: no share of rent, utilities or insurance, and no depreciation for that year (§4.01(4), §4.06). Mortgage interest and real estate taxes on the home remain deductible in full on Schedule A for an itemizer (§4.04), and expenses of the business that have nothing to do with the home — supplies, a business phone line, equipment — are deducted as usual (§4.05).
The election is made year by year simply by using the method on the return, and it is irrevocable for that year once made (§4.03). Switching between the simplified and regular methods from one year to the next is allowed and is not a change in accounting method. The safe harbor is subject to the same gross income limitation as the regular method, but any excess is lost rather than carried over (§4.08(2)), and expenses carried over from an earlier regular-method year cannot be used in a simplified-method year.
The regular method
Form 8829 computes the deduction from actual expenses. The starting point is the business percentage: the area used for business divided by the total area of the home (or, where rooms are of similar size, rooms divided by rooms). Expenses are then classified:
- Direct expenses benefit only the business part — painting the office, repairing its window — and are deductible in full.
- Indirect expenses benefit the whole home — rent, mortgage interest, property taxes, homeowners or renters insurance, utilities, general repairs, a security system — and are deductible at the business percentage.
- Unrelated expenses — lawn care, a kitchen remodel — are not deductible at all.
A homeowner also depreciates the business part of the home. The basis is the lesser of the home's adjusted basis or its fair market value when business use began, excluding land, multiplied by the business percentage, and it is written off as nonresidential real property over 39 years on the straight-line method (about 2.564% a year after the first). Depreciation is not optional: the basis of the home is reduced by the depreciation allowable whether or not it was claimed, so a homeowner using the regular method should claim it.
Form 8829 applies the expenses in a fixed order — mortgage interest and taxes first, then the operating expenses, then depreciation — because of the limit described next. The result flows to Schedule C.
The gross income limitation
Under either method, the home office deduction cannot exceed the gross income from the business use of the home reduced by the business's other deductions (§280A(c)(5)). In practice: take Schedule C gross income attributable to the home office (for a business run entirely from home, all of it), subtract every other business expense, and what remains is the ceiling on the home office deduction. A business with $9,000 of receipts and $3,400 of other expenses can deduct at most $5,600 for the home, and a business running at a loss deducts nothing for the home that year.
Under the regular method, the disallowed amount carries forward to the next year in which there is income to absorb it, with the same ordering (mortgage interest and taxes are never limited, since they would be deductible anyway; operating expenses and depreciation are). Under the simplified method there is no carryover. A taxpayer whose business had a bad year is therefore better off on the regular method, if the records exist, so that the year's expenses are not lost.
What it is worth
The home office deduction is a Schedule C expense. It reduces net profit, and therefore reduces self-employment tax as well as income tax — unlike the health insurance and retirement deductions, which are adjustments to income and leave self-employment tax alone. Per dollar, it is the more valuable kind.
The example takes a 200-square-foot office in a 1,600-square-foot rented home (12.5% of the home). Rent is $24,000 a year, utilities $3,600, renters insurance $1,200, and $400 was spent repairing the office itself. The regular method gives $3,600 of indirect expenses plus $400 direct, $4,000 in all; the simplified method gives 200 × $5 = $1,000. The filer is single, with $80,000 of receipts and $8,000 of other expenses.
| Deduction | Self-employment tax | Income tax | Total federal tax | Saved | |
|---|---|---|---|---|---|
| No home office deduction | — | $10,173 | $4,630 | $14,803 | — |
| Simplified method | $1,000 | $10,032 | $4,541 | $14,573 | $231 (23.1% of the deduction) |
| Regular method | $4,000 | $9,608 | $4,273 | $13,881 | $922 (23.1% of the deduction) |
Each dollar of deduction saves about 23.1% here: the 12.0% income tax rate, plus self-employment tax at 15.3% of 92.35% of the dollar, less the small offsets from the ½-SE-tax deduction and the QBI deduction that shrink alongside profit. The regular method is worth $692 more than the simplified method for this office; whether that is worth keeping the utility bills and the Form 8829 depends on the filer. For a small office in an inexpensive home the simplified figure can exceed the actual expenses, and it is always the right choice when it does.
Selling the home
Two consequences of the regular method surface when a home is sold. Depreciation claimed (or allowable) after May 6, 1997 is not covered by the §121 exclusion of gain on a principal residence and is taxed as unrecaptured §1250 gain, at a maximum rate of 25%. And if the office was a separate structure, or the business part is otherwise treated as separate property, the exclusion does not apply to the gain allocated to it at all. A home office within the dwelling itself does not split the sale into two properties; only the depreciation is recaptured. The simplified method involves no depreciation and so leaves nothing to recapture for the years it was used.
Records
For either method: the square footage of the office and of the home, and evidence of the use (a floor plan, photographs, the nature of the work). For the regular method, in addition: every bill that goes into the indirect expenses, receipts for direct expenses, and the home's purchase records and improvement costs for the depreciation basis. Form 8829 is filed with the return each year the regular method is used; the simplified method is computed directly on Schedule C.
Documents this guide was written from
- 26 U.S.C. §280A(c) — the exceptions for business use of a dwelling: exclusive-use test, principal place of business, the gross income limitation and carryover in (c)(5)
- IRS Rev. Proc. 2013-13 — the safe harbor: $5 per square foot up to 300 square feet, no depreciation, no carryover, year-by-year election
- Instructions for Form 8829, Expenses for Business Use of Your Home — the regular method: business percentage, direct and indirect expenses, the deduction limit, depreciation
- IRS Publication 587, Business Use of Your Home — worked examples, daycare and storage exceptions, the sale of a home used for business
Figures in the tables are computed by the same engine as the site's calculators from its 2026 data files; the methodology page lists the rules and their verification status, and the editorial policy says how sources are chosen. Tallyvane is not a CPA, enrolled agent or attorney.