Workspace expense guide
Home Office Tax Deduction Guide for Small Business
Understand exclusive and regular business use, simplified-versus-actual methods, expense allocation, and the records behind a home-office deduction.
Direct answer
Direct answer
A home-office deduction generally requires a clearly identified part of the home used regularly and exclusively for qualifying business activity, subject to exceptions and local rules. Eligible self-employed taxpayers may have a simplified calculation or an actual-expense allocation. Measure the workspace, document how it is used, retain household bills, and confirm eligibility before claiming it.
Establish that the space qualifies
Under common U.S. rules, the area generally must be used regularly and exclusively for business and meet a qualifying business-use test, such as use as a principal place of business. A desk in a room routinely used for personal activities can fail the exclusive-use requirement even when many hours are worked there.
Special rules may apply to storage, daycare, detached structures, employees, and more than one work location. Employment status and jurisdiction matter. Photograph and describe the workspace, but ask a qualified adviser to apply the test.
Measure and document the business area
Record the office dimensions and the home's total finished area under a consistent method. Keep a floor plan, dated photos, lease or ownership records, and notes describing the work performed there. If the space changes during the year, record the date and new measurement.
A dedicated room is easy to explain, but a separately identifiable portion of a room may also be relevant under some rules. The evidence should support the specific area claimed rather than an estimate chosen at filing time.
Simplified versus actual-expense methods
A simplified method generally applies an official amount to qualifying square footage, subject to current limits. An actual-expense method allocates eligible indirect home costs and includes direct office costs. Rates, caps, carryovers, and method interactions can change, so compare them with current guidance.
The actual method can require additional records and may affect depreciation and a later sale of the home. Do not choose only by looking at this year's utility total; consider administration and future consequences.
Organize direct and indirect costs
Direct expenses benefit only the office, such as repairing the office wall. Indirect expenses support the entire home, such as rent, qualifying mortgage interest, utilities, insurance, and general repairs, and may be allocated. Costs unrelated to the office remain personal.
- Keep monthly rent or ownership records and utility bills.
- Identify office-only repairs separately from whole-home work.
- Record internet and phone business use under their appropriate categories and allocation rules.
- Preserve property-tax, insurance, depreciation, and improvement records when applicable.
Close the home-office file annually
Maintain a dedicated record with eligibility notes, measurements, method choice, calculation, source bills, and any adviser adjustments. Monthly expense software can collect the receipts, but the annual calculation should remain visible and reproducible.
Do not classify every household purchase as office expense. Furniture, computers, supplies, phone, and internet may have their own categories and business-use allocations even when used in the same room.
Common questions
FAQ
Does a home office have to be a separate room?
Not always under common U.S. rules, but the business area generally must be separately identifiable and used regularly and exclusively for qualifying business activity. Local rules differ.
Can I deduct all of my internet and utilities?
Usually not when they also serve personal or whole-home use. Keep bills and use a supportable allocation under the method your adviser recommends.
Should I use the simplified or actual home-office method?
Compare eligibility, current rates and limits, recordkeeping burden, depreciation effects, and your actual costs. A qualified tax professional can model both methods for your facts.
See it in context
Receipt workflows by business
ReceiptLine uses AI to extract and suggest expense details. It is not accounting or tax advice. Review each receipt and confirm the correct treatment with a qualified professional for your jurisdiction.