Home Office Deduction Calculator: Simplified vs. Regular Method (2026)

Most home office deduction calculators show only the simplified method, hand you a single number, and call it done. This calculator runs both the simplified method and the regular (actual expense) method side by side, so the estimate reflects what you would actually report on Schedule C, not just the easier path.

The tool is built for US-based freelancers, independent contractors, and sole proprietors who file Schedule C (Form 1040) and maintain a dedicated home office. It does not apply to W-2 employees. Under the Tax Cuts and Jobs Act of 2017, employees lost the ability to deduct unreimbursed home office expenses as a miscellaneous itemized deduction. The One Big Beautiful Bill Act, signed July 4, 2025, made that suspension permanent for tax years after 2025.

For Schedule C filers, the regular method produces a deduction calculated on Form 8829. The simplified method bypasses Form 8829 entirely and reports directly on Schedule C. Both routes reduce net Schedule C income, which lowers both ordinary income tax and self-employment tax, a dual benefit that most calculators describe only in passing but that can meaningfully change the total savings figure.

Inputs the calculator uses: square footage of the home office and total home, total indirect home expenses (rent or mortgage interest, utilities, insurance, repairs), any direct expenses specific to the office space, and net Schedule C income before the home office deduction. The output shows the estimated deduction under each method, which method produces the larger result, and an estimate of combined income-tax and SE-tax savings at your marginal rate.

Established by Revenue Procedure 2013-13, the simplified method multiplies allowable square footage by a prescribed rate of $5 per square foot. The allowable square footage is the area used exclusively for business, capped at 300 sq ft, for a maximum annual deduction of $1,500.

Simplified deduction = office sq ft (max 300) × $5

No Form 8829 is required. The deduction flows directly to Schedule C, Line 30. Depreciation on the home is treated as zero for that year, so there is no depreciation recapture exposure when the home is sold.

The regular method requires Form 8829. First, calculate the business-use percentage by dividing office area by total home area. Then apply that percentage to all indirect expenses, and add 100% of any direct expenses.

Business-use % = office sq ft / total home sq ft
Deductible indirect expenses = business-use % × qualifying indirect expenses
Total regular method deduction = (business-use % × indirect expenses) + direct expenses + (business-use % × depreciation, homeowners only)

Qualifying indirect expenses include rent, utilities, homeowner's or renter's insurance, repairs that benefit the whole home, and general maintenance. Direct expenses (costs that benefit only the office, such as repainting the office walls or replacing office-only flooring) are deductible at 100%.

Homeowners using the regular method may also deduct depreciation on the business portion of the home. The depreciable basis is the business-use percentage multiplied by the building value (purchase price minus land). Under MACRS, the business portion is depreciated straight-line over 39 years (Publication 587; Publication 946).

Annual depreciation = depreciable basis × 1/39 (~2.564%)

Profile: Maya rents a 900 sq ft Denver apartment for $2,100/month ($25,200/year). She uses a dedicated 150 sq ft spare bedroom for design work. Utilities: $3,600. Renters insurance: $480. Net Schedule C income before home office deduction: $87,400. Single filer, 22% marginal rate.

Step 1 - Simplified Method: 150 × $5 = $750.

Step 2 - Regular Method: Business-use % = 150 / 900 = 16.67%.

Step 3 - Winner: Regular method wins by $4,131 ($4,881 vs $750).

Step 4 - Tax savings: Income tax saved at 22% = $1,074. SE tax saved:

$4,881 × 0.9235 × 0.153 = $689

Total estimated federal tax savings (regular method): $1,763/year. The simplified method would save roughly $211 total. Choosing the regular method adds an estimated $1,552 in annual tax savings for Maya.