Quick answer
A home workspace is not automatically deductible. The IRS applies specific business-use requirements and calculation rules.
The core idea
Review exclusive and regular use, principal-place-of-business rules, employee limitations, and how the chosen method affects expense records. State treatment can differ, and the tax effect depends on the full return.
Test eligibility before measuring expense
Working at home does not automatically create a federal deduction. Review whether a specific area is used regularly and exclusively for qualifying business activity and whether the principal-place-of-business or other applicable tests are met. Current employee and self-employed rules differ. Document the space and its use before choosing a calculation method.
Compare the calculation methods
The simplified method and regular method use different calculations and record requirements. The regular method can involve direct expenses and an allocable portion of eligible indirect home costs, with limitations and depreciation consequences. Compare both using complete records rather than assuming the method with the larger preliminary number is permitted or best for the full tax situation.
Keep a defensible file
Retain measurements, floor plans or photos, dates, bills, receipts, calculations, business-income records, and prior depreciation information where applicable. Record changes in the size or use of the space. Mixed personal use can defeat the general exclusive-use test even when substantial work occurs there, subject to limited statutory exceptions. Check state treatment separately from the federal deduction and keep the full calculation.
Assumptions to check
This guide starts from the following assumptions. Change the plan when any of them do not fit your situation.
- The workspace satisfies current eligibility rules before any expense is calculated.
- Simplified and regular methods are compared using complete records and limitations.
- Federal and state treatment are checked separately.
A practical sequence
- Measure and document the workspace and how it is used.
- Confirm current eligibility using IRS guidance before calculating a deduction.
- Compare simplified and regular methods with complete records.
- Keep floor plans, photos, bills, receipts, and calculations with the tax file.
Worked illustration
Illustration: a room used both as an office and guest room may fail an exclusive-use requirement even when substantial work happens there. A clearly separated dedicated area may be evaluated differently.
This is an illustration, not a forecast or recommendation. Replace every assumption with your own verified numbers.
What can go wrong
- Assuming working from home is enough.
- Using the full home cost instead of the permitted business portion.
- Ignoring different rules for employees and self-employed workers.
Your short checklist
- Document the space
- Confirm eligibility
- Compare methods
- Keep supporting records
Verify before acting
Open the official links below and confirm that current rules and your account, product, or program details match this guide's assumptions.
Home-office deduction — Internal Revenue Service
Current eligibility and calculation rules, including regular and exclusive business use and simplified versus regular methods.
Self-employed individuals tax center — Internal Revenue Service
Federal filing, self-employment tax, estimated-payment, and recordkeeping obligations for independent work.