Home office deduction for the self-employed in 2026
A room you work in can lower both your income tax and your self-employment tax, provided it passes the tests and you pick the better of two methods.
Best home office deduction
$4,000
Regular method (Form 8829) · federal tax saved about $922 (single filer)
| Simplified: $5 × 200 sq ft | $1,000 |
| Regular: 13.3% of home costs | $4,000 |
Computed by Radif Partners from IRS documents for tax year 2026 · How we calculate · no email asked, nothing sold
Self-employed people can deduct the business part of their home when a specific area is used exclusively and regularly as the principal place of business, or to meet clients, with exceptions for inventory storage and daycare. There are two ways to compute it. The simplified method multiplies the office area by $5, with at most 300 square feet, so the deduction tops out at $1,500; it needs no expense records and no depreciation. The regular method, on Form 8829, takes the office's share of rent or mortgage interest, utilities, insurance and repairs, plus depreciation if you own. For a 200 square foot office in a 1,500 square foot home with $30,000 of yearly costs, the simplified method gives $1,000 and the regular method $4,000. Either way the amount goes on Schedule C, line 30, reduces SE tax as well as income tax, and cannot exceed the profit the business earns from that home office.
Enter the office area, the size of the whole home, what the home costs you in a year and your profit before the deduction. The calculator figures both methods, keeps the larger, and estimates the federal tax it saves for a single filer. The regular figure leaves out depreciation, which raises the deduction for owners but comes back as taxable gain when the home is sold, as explained below.
What a $1,000 expense really costs
Federal and SE tax saved
$231
| Net cost of the expense | $770 |
Single filer, before state tax.
The tests the space has to pass
Under Publication 587, part of a home qualifies when it is used exclusively and regularly as your principal place of business, or exclusively and regularly to meet or deal with clients, patients or customers. A detached structure such as a studio in the garden qualifies when used in connection with the business. Storage of inventory or product samples and a home daycare qualify under softer rules.
Exclusive means nothing else happens there
The area must serve the business only. It can be a room or a clearly identifiable part of one, and it does not need a wall around it, but a corner that also serves as the family's television space fails. The two exceptions are inventory storage, when your home is the only fixed location of a retail or wholesale business, and daycare. Everything else that mixes personal use is out.
Regular, and for a real business
Occasional or incidental use is not enough; the IRS weighs the facts. The use must also be for a trade or business. Managing your own investments from a spare room is not a business, however often you do it. Whether you are in business at all, rather than working as someone's employee, is the question taken up on the 1099 vs W-2 page.
Principal place of business
A home office can be your principal place of business even if you do client work elsewhere, when you use it for administrative or management tasks and have no other fixed location where you do much of that work. Think of a plumber who invoices, orders parts and keeps the books at home while doing the repairs at customers' addresses. Once it qualifies, trips from home to clients become deductible business travel rather than commuting.
Simplified method or Form 8829
| Office | Home costs per year | Simplified | Regular, before depreciation | Larger |
|---|---|---|---|---|
| 100 of 1,200 sq ft | $24,000 | $500 | $2,000 | Regular |
| 200 of 1,500 sq ft | $30,000 | $1,000 | $4,000 | Regular |
| 300 of 2,000 sq ft | $36,000 | $1,500 | $5,400 | Regular |
| 450 of 2,400 sq ft | $42,000 | $1,500 | $7,875 | Regular |
The simplified method suits renters with cheap housing, small offices and anyone who wants no paperwork: $5 times the area, up to 300 square feet (IRS simplified option). Mortgage interest and property taxes then stay where they would have been, on Schedule A if you itemize. You cannot carry forward a disallowed amount into a simplified year, and only one home can use the method in a year. You choose each year on a timely original return; switching back and forth is allowed.
The regular method splits real costs by the business percentage, usually the office's floor area over the home's. Rent, utilities, insurance, repairs and, for owners, mortgage interest, property taxes and depreciation all count. In the example of 200 square feet out of 1,500, the share is 13.333 %, and $30,000 of costs becomes $4,000. For a single filer with $80,000 of profit, that cuts federal income and SE tax by $922, against $231 with the simplified method. If you start partway through the year, only the months of business use count.
The gross income limit
The deduction cannot create a loss. Under the regular method, the business income earned from the home pays first for the business part of expenses you could deduct anyway, such as mortgage interest and taxes, then for business costs unrelated to the home, and only what is left absorbs utilities, insurance and repairs, with depreciation last. The excess carries over to the next year in which you use actual expenses. The simplified method applies the same ceiling in its own way: the deduction is the smaller of the square-foot amount and the income from the home office minus business expenses unrelated to the home.
Depreciation and selling the home
Owners using Form 8829 depreciate the office part of the house, excluding land, as nonresidential real property over 39 years on a straight line. The catch comes at sale. The gain exclusion on a main home does not cover the part of the gain equal to depreciation allowed or allowable after May 6, 1997, and the basis must be reduced by depreciation you could have taken even if you skipped it. A simplified year counts as zero depreciation. An office inside the home does not otherwise require splitting the sale into two properties; a separate structure can.
Where it goes on the return
The deduction lands on Schedule C, line 30, after all other expenses, so it lowers the profit that feeds both Schedule SE and income tax. With Form 8829, the amount on its line 36 is what you carry over. Other home-related costs that are purely business, like a dedicated phone line or office supplies, are ordinary expenses and are deductible with either method; the deductions guide lists them.