How to Deduct a Home Office: Simplified vs. Actual Method

If you are self-employed and work from home, the home office deduction lets you write off part of your rent or mortgage interest, utilities, insurance, and other housing costs as a business expense. You can calculate it two ways: a simplified method worth up to $1,500, or an actual expense method that prorates your real costs by the share of your home used for business. The deduction reduces both your income tax and your self-employment tax.¹

Who Can Claim It

The deduction is for people who run a business or freelance operation from home and report that income on Schedule C, Schedule F, or a similar business return.¹ Rideshare drivers, online sellers, contract designers, and anyone else with self-employment income based at home is potentially eligible. Renters qualify on the same terms as homeowners; instead of mortgage interest and property taxes, you deduct the business share of your rent.²

W-2 employees cannot claim this deduction, even if they work remotely full time. The Tax Cuts and Jobs Act of 2017 eliminated the unreimbursed employee expense deduction that previously allowed it, and the One Big Beautiful Bill Act of 2025 made that elimination permanent. If you hold a W-2 job and also run a side business, you can claim the deduction for the side business only.

Separate structures on your property count too. A detached garage converted to a studio, a backyard shed used as a workshop, or a standalone greenhouse qualifies as long as it meets the same use requirements as an interior office.²

The Exclusive and Regular Use Tests

Your workspace must pass two tests under Section 280A of the Internal Revenue Code: exclusive use and regular use.³ Exclusive use means the area serves no personal purpose. A spare bedroom that doubles as a guest room fails. A kitchen table where the family eats dinner fails. You need a defined area used only for the business. Regular use means you work there consistently, not just occasionally.

Beyond those tests, the space must also satisfy one of three qualifying conditions:

It is your principal place of business, meaning you handle the core administrative and management work of the business there and have no other fixed location where you do that work. You can still meet clients or travel for jobs; what matters is where the paperwork and scheduling happen.³
You use it to regularly meet clients, patients, or customers as part of normal business operations, even if it is not your principal office.³
It is a separate structure on your property used exclusively and regularly for business.²

Two narrow exceptions relax the exclusive use rule: storage space in a home that is the only fixed location of a product-selling business, and licensed daycare providers who use living space during business hours.⁴ Both come with their own conditions in Publication 587.

The Simplified Method

The simplified method skips expense tracking. You deduct $5 per square foot of home office space, up to 300 square feet, for a maximum deduction of $1,500. You don’t gather utility bills, insurance statements, or depreciation schedules. Your full mortgage interest and property taxes still go on Schedule A as itemized deductions, because none of them are being apportioned to the business.⁵

If your office started or stopped partway through the year, you prorate the deduction month by month, counting only months with at least 15 days of qualified business use and capping any single month at 300 square feet.⁶

There is no depreciation component under this method. That means a smaller current deduction, but nothing to recapture if you sell the home later.

The Actual Expense Method

The actual expense method takes more work but usually produces a larger deduction, especially if your housing costs are high. Start with your business-use percentage: divide the square footage of the office by the total square footage of the home. A 200-square-foot office in a 2,000-square-foot house gives you 10 percent.¹

Indirect and Direct Expenses

Indirect expenses benefit the whole home, and you deduct only your business-use percentage of each. These include mortgage interest (or rent), property taxes, homeowners or renters insurance, utilities such as electricity and gas, and general maintenance.⁴ A $1,000 roof repair in a home with a 10 percent business-use rate produces a $100 deduction. A full roof replacement is treated as an improvement and depreciated instead.

Direct expenses benefit only the office and are fully deductible: painting the office walls, replacing the flooring in that room, or repairing a window in the workspace.⁷

Phone, Internet, and Utilities

Electricity, gas, water, and trash removal are indirect expenses prorated by your business-use percentage.⁴ Internet used for both personal and business purposes follows the same approach. The cost of a basic first telephone landline into your home is never deductible as a business expense, though business long-distance charges on that line can be, and a second dedicated business line is deductible.⁸ Cell phone costs used for business are generally deductible as a separate business expense on Schedule C rather than through the home office calculation.

Depreciation

You also depreciate the business portion of your home. Start with the smaller of the home’s adjusted basis (what you paid, plus improvements, minus land value) or its fair market value on the date you first used it for business. Multiply that by your business-use percentage to get the depreciable basis, then apply the IRS depreciation percentage for residential property.⁴ The calculation goes on Part III of Form 8829.¹ Depreciation increases your current deduction but creates a tax bill when you sell the home, covered below.

Choosing Between the Two Methods

You can switch methods from year to year, but you are locked in once you file for a given tax year.⁶ The simplified method tends to work for small offices, modest housing costs, or anyone who does not want to track receipts. The actual expense method tends to win when the home is expensive, the office takes up a meaningful share of the space, or there are substantial direct expenses and depreciation.

Run the numbers both ways before filing. If your actual expenses come out near or below $1,500, the simplified method saves paperwork for little financial difference. Well above $1,500, the tracking effort pays for itself.

The Income Cap and Carryforward

Under either method, the deduction cannot exceed the gross income from the business that uses the home, after other business expenses.⁵ A freelance business with $8,000 in revenue and $7,500 in other expenses caps its home office deduction at $500, whatever the calculation produces.

The methods diverge on what happens to the excess. Under the actual expense method, any amount above the income cap carries forward to the next tax year. You report the carryover on Part IV of Form 8829, and it flows onto the following year’s form automatically.⁹ Under the simplified method, excess amounts are lost permanently.⁵ For a business with lean years, that difference can decide the choice on its own.

How to File It

For the actual expense method, complete Form 8829. Lines 1 and 2 capture office and total home square footage to compute your business percentage. Indirect expenses (mortgage interest, property taxes, utilities, insurance) go in their designated sections and get prorated. Direct expenses are entered separately at full value. Depreciation is calculated in Part III. The final deduction on line 36 transfers to line 30 of Schedule C.¹⁰

For the simplified method, you skip Form 8829 entirely. Complete the Simplified Method Worksheet in the Schedule C instructions and enter the result on Schedule C, line 30.¹⁰ Either way, the deduction lowers your net business profit, which cuts both income tax and self-employment tax.

Be careful with mortgage interest and property taxes under the actual expense method. The business portion goes on Form 8829, and only the remaining personal portion goes on Schedule A. Double-counting the same dollars on both forms is a common mistake that draws IRS attention.

Records to Keep

Keep documentation for at least three years from the date you file: utility bills, insurance statements, mortgage or rent records, receipts for direct expenses, and a floor plan or measurement notes showing your office dimensions. If you underreport income by more than 25 percent of gross income, the IRS has six years to audit rather than three, so err on the side of keeping records longer.¹¹ Digital copies are fine as long as they are legible and accessible.

What Happens When You Sell the Home

When you sell a primary residence, you can generally exclude up to $250,000 in capital gains ($500,000 if married filing jointly) under the Section 121 exclusion. If the office was inside the home rather than a separate structure, you don’t split the sale between business and personal portions; the whole gain qualifies for the exclusion.¹²

The catch is depreciation recapture. Any depreciation you claimed, or were entitled to claim, on the home office after May 6, 1997, cannot be excluded from gain. That portion is taxed at a maximum rate of 25 percent as unrecaptured Section 1250 gain and may also be subject to the 3.8 percent Net Investment Income Tax.¹³ Claim $15,000 in depreciation over several years, and that $15,000 is taxable at up to 25 percent when you sell, whatever the Section 121 exclusion covers.

This is why the simplified method appeals to people who plan to sell in the foreseeable future. It has no depreciation component, so there is nothing to recapture.⁵ The annual deduction is smaller, but for someone with substantial home equity and a sale on the horizon, avoiding recapture can be the better move overall.

1
Internal Revenue Service. Form 8829, Expenses for Business Use of Your Home
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Internal Revenue Service. How Small Business Owners Can Deduct Their Home Office From Their Taxes
3
Office of the Law Revision Counsel. 26 U.S. Code 280A – Disallowance of Certain Expenses in Connection With Business Use of Home
4
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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Internal Revenue Service. Topic No. 509, Business Use of Home
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Internal Revenue Service. Office in the Home FAQ
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Internal Revenue Service. Instructions for Form 8829 (2025)
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Internal Revenue Service. Instructions for Schedule C (Form 1040)
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Internal Revenue Service. How Long Should I Keep Records?
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Internal Revenue Service. Publication 523, Selling Your Home
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Internal Revenue Service. Property (Basis, Sale of Home, Etc.) 5