How to File IRS Form 8829 for Home Office Deductions

To file IRS Form 8829, you calculate the business-use percentage of your home, apply it to your home expenses and depreciation, respect the gross-income cap on the deduction, and carry the final number to line 30 of Schedule C. The form is only for sole proprietors and single-member LLC owners filing Schedule C. If that describes you and part of your home is used exclusively and regularly for your business, the sections below walk through each step in the order the form asks for it.

Who Can Use Form 8829

Form 8829 attaches to Schedule C. Partners in partnerships and farmers filing Schedule F cannot use it; they compute their home office deduction with the worksheet in IRS Publication 587 instead.¹ W-2 employees cannot use it at all under current law, because the Tax Cuts and Jobs Act suspended the unreimbursed employee expense deduction through 2025.²

Homeowners and renters both qualify, provided the space itself meets the tests in Internal Revenue Code Section 280A.³

Qualifying the Space

The core requirement is exclusive and regular business use. Exclusive means the space is not also a guest room, playroom, or personal workstation. A kitchen table where you handle invoices at night does not qualify. A spare bedroom converted entirely into an office does.

The space must also be your principal place of business. The IRS treats a home office as your principal place of business if you handle administrative or management tasks there and have no other fixed location where you do that work.³ You also qualify if you regularly meet clients in the space or if you use a separate unattached structure, such as a converted detached garage, for the business.

Two narrow situations relax the exclusive-use rule. A licensed home daycare can deduct rooms used for both business and family purposes, prorated by hours of daycare use against total hours available.³ You must hold, or have applied for and not been denied, a state daycare license. Retail or wholesale sellers whose home is their only fixed business location can also deduct space used regularly (though not exclusively) to store inventory or product samples.

Calculating Your Business-Use Percentage

Every indirect expense on Form 8829 gets multiplied by this percentage, so measure carefully. The standard approach is square footage: divide the area of your office by the total area of your home. An office of 200 square feet in a 2,000-square-foot home produces 10%.⁴ Keep the measurements with your tax records. Overstating this percentage is one of the fastest ways to draw scrutiny.

Working Through the Form

Form 8829 sorts your household costs into three buckets.⁴

Direct expenses benefit only the business portion of your home, such as painting the office or repairing a window in the workspace. These are deductible in full.
Indirect expenses keep the whole home running: utilities, homeowners insurance, rent, mortgage interest, real estate taxes, and general repairs. These are multiplied by your business-use percentage.
Unrelated expenses, such as remodeling a bathroom on the opposite side of the house, are not deductible on Form 8829 at all.

Renters enter rent as an indirect expense, which often makes Form 8829 especially worthwhile since rent is not deductible anywhere else on your return.⁵ Homeowners include mortgage interest and property taxes as indirect expenses here, but the business portion claimed on Form 8829 cannot also be claimed on Schedule A.

Depreciation

If you own the home, the IRS requires you to depreciate the business portion, and it does so whether or not you actually claim the deduction. Home offices are treated as nonresidential real property with a 39-year recovery period using the straight-line method.¹ A full year of use produces a 2.564% depreciation rate applied to your depreciable basis (cost minus land value, multiplied by your business-use percentage).

Offices placed in service partway through the year use a mid-month convention. Form 8829’s instructions include a table with the first-year percentage for each starting month; for example, an office first used in January uses 2.461%, while one starting in July uses 1.177%.¹ Skipping this line does not spare you anything at sale, as discussed below.

The Income Limitation and Carryover

Your total home office deduction cannot exceed the gross income from the business that uses the space. If your freelance income is $3,000 and your home office expenses total $5,000, you deduct $3,000 this year.³

The unused $2,000 does not disappear. Part IV of Form 8829 computes the amount you carry forward to the next year, where it is again subject to the same income limitation.¹ Carryover amounts from earlier Form 8829 filings remain available even if you used the simplified method in an intervening year and are switching back.

Partial-Year Use and Multiple Homes

If the office was in use for only part of the year, expenses and depreciation are prorated for those months. If you moved and had a qualifying office in each home, file a separate Form 8829 for each; the simplified method can be used for at most one of them, and any additional home must use the actual expense method.¹

Where the Deduction Lands on Your Return

The final figure from Form 8829 flows to line 30 of Schedule C.⁶ That reduces your net business profit, which reduces both your income tax and your self-employment tax. If you run more than one business out of the home, the instructions require you to allocate the deduction among them.

Skipping Form 8829: The Simplified Method

You are not required to file Form 8829 to claim a home office deduction. The simplified method gives you $5 per square foot of office, capped at 300 square feet, for a maximum deduction of $1,500.⁷ The number goes straight on Schedule C with no supporting form. Under this method, depreciation is treated as zero, so your home’s cost basis is not reduced, and mortgage interest and property taxes remain fully available for Schedule A.⁸

You can switch between the actual expense method and the simplified method from year to year, choosing whichever produces a larger deduction.⁹ Filing Form 8829 usually pays off when housing costs are high, the office occupies a meaningful share of the home, or expenses comfortably exceed $1,500. Someone paying $2,000 monthly rent with a 15% business-use percentage already exceeds the $1,500 cap on rent alone. The simplified method tends to win when the office is small, costs are modest, or you plan to sell the home soon and want to avoid the recapture issue.

The Sale-of-Home Trap

Any depreciation you claim (or were entitled to claim) on Form 8829 after May 6, 1997 must be recaptured when you sell the home, even if the sale otherwise qualifies for the Section 121 capital gains exclusion of $250,000 for single filers or $500,000 for joint filers.¹⁰ That portion of the gain is taxed at up to 25% as unrecaptured Section 1250 gain. The IRS applies the greater of depreciation actually claimed or depreciation allowable, so leaving the depreciation line blank does not help.⁸

If the office is inside the living area of the home rather than a separate structure, you do not allocate the sale itself between business and personal use for Section 121 purposes; only the depreciation is carved out. Years in which you used the simplified method contribute zero depreciation and do not reduce your basis.⁸

Records to Keep

The IRS can disallow the entire deduction if your records do not support it, and this deduction gets more scrutiny than most. Hold on to:

Photos of the office, a floor plan showing the dedicated area, and the measurements behind your business-use percentage.
Utility bills, insurance statements, rent receipts or mortgage statements, repair invoices, and property tax records for every expense on Form 8829.
Closing documents showing purchase price and assessed land value, plus the date the office was placed in service.
Business income records, since the deduction is capped by the gross income the office generates.

Keep general records for at least three years after filing. If you claimed depreciation, keep the purchase documents and depreciation schedules until three years after you sell the home and file the return that reports the sale. The recapture calculation at that point depends on records going back to the first year you used the office.

1
Internal Revenue Service. Instructions for Form 8829
2
U.S. Congress. Expiring Provisions in the Tax Cuts and Jobs Act (TCJA, P.L. 115-97)
3
Office of the Law Revision Counsel. 26 USC 280A – Disallowance of Certain Expenses in Connection With Business Use of Home, Rental of Vacation Homes, Etc.
4
Internal Revenue Service. Publication 587 – Business Use of Your Home
5
Internal Revenue Service. How Small Business Owners Can Deduct Their Home Office From Their Taxes
6
Internal Revenue Service. Form 8829 – Expenses for Business Use of Your Home
7
Internal Revenue Service. Simplified Option for Home Office Deduction
8
Internal Revenue Service. Depreciation and Recapture 3
9
Internal Revenue Service. FAQs – Simplified Method for Home Office Deduction
10
Internal Revenue Service. Publication 523 – Selling Your Home