Home Office Tax Deduction Calculator

To claim the home office deduction, the space must satisfy two core tests established under IRC Section 280A. The exclusive use test requires that the area is used solely for business -- a desk in the corner of a bedroom that doubles as a guest room does not qualify. The only exception is for daycare providers and inventory/product storage for home-based businesses. The regular use test requires consistent, ongoing business use rather than occasional or incidental activity.

The space must also qualify as the taxpayer's principal place of business. The IRS considers two factors: the relative importance of activities performed at each location, and the time spent at each location. A freelancer who works from home 40 hours per week and meets clients elsewhere 5 hours per week clearly satisfies this test. Alternatively, the space qualifies if it is used regularly to meet clients, customers, or patients.

W-2 employees lost the home office deduction after the Tax Cuts and Jobs Act of 2017 suspended the unreimbursed employee expense deduction through 2025. However, self-employed individuals (sole proprietors, independent contractors, single-member LLC owners) who file Schedule C remain fully eligible. Partners in partnerships can also claim the deduction if the partnership agreement doesn't reimburse the expense.

Under the regular method, Form 8829 categorizes expenses into direct and indirect costs. Direct expenses -- painting the office, installing dedicated office lighting -- are 100% deductible. Indirect expenses -- mortgage interest, rent, property taxes, homeowners insurance, utilities, general repairs -- are deductible at the business-use percentage.

For homeowners, the regular method requires depreciating the business portion of the home over 39 years using the straight-line method. On a home purchased for $300,000 (excluding land value of $75,000), the depreciable basis is $225,000. At a 10% business-use rate, annual depreciation equals approximately $577. This depreciation must be recaptured at a 25% rate when the home is sold, even if the deduction was not claimed.

Common deductible indirect expenses include: rent or mortgage interest (the largest component for most filers), real estate taxes, homeowners or renters insurance, utilities (electricity, gas, water, internet, phone), repairs and maintenance affecting the entire home, and security system costs. Internet service is deductible at the business-use percentage; a dedicated business phone line is 100% deductible as a direct expense.