Home Office Simplified vs Actual Method Guide for Founders (2025-2026)
Deduction substantiation path
How to support a deduction from the statute down to the records behind it.
Confirm the deduction is allowed
The expense must meet the statutory ordinary-and-necessary test.
Tie it to the activity
Connect the expense to the US trade or business or income it supports.
Keep contemporaneous records
Receipts, invoices, and logs that prove the amount and purpose.
Claim on the return
Report the deduction where the form and instructions direct.
Key Takeaways
- The simplified method generally uses $5 per square foot up to 300 square feet.
- It can reduce recordkeeping, but it blocks home depreciation and home section 179 for that year.
- The election is made on a timely filed original return and is irrevocable for that year.
- The simplified method and the actual-expense method should be compared before filing.
The simplified method saves time, but it also gives up part of the deduction system
Publication 587 says the simplified method generally works by multiplying $5 by the allowable square footage, up to a maximum of 300 square feet. That makes it attractive for founders who want a clean return without a full household allocation workbook.
But the tradeoff is real. The simplified method is not just a faster way to compute the same deduction. It changes what you are allowed to claim for the home portion of the business.
Using the simplified method shuts off home depreciation and home section 179
Publication 587 states that if you elect the simplified method, you cannot deduct actual home-office expenses for that home portion and you cannot deduct depreciation or section 179 expense for the part of the home used for qualified business use. The depreciation allowable for that portion is treated as zero for the year.
That matters because many founders compare the methods only by looking at utilities and rent. The bigger difference can be what happens to depreciation and carryovers.
The election is annual, but each year's choice is sticky
Publication 587 says you choose the simplified method on a timely filed original return and, once made for that tax year, the election is irrevocable. You can switch methods in a later year without IRS consent, but you cannot redo the same year after the return is timely filed.
That means the comparison should happen before filing, not after the return is already in the system.
Frequently Asked Questions
How large can a simplified home-office deduction area be?
Publication 587 limits the simplified method to 300 square feet.
Can I claim home-office depreciation if I use the simplified method?
No. Publication 587 says depreciation for the home portion is treated as zero for a year in which the simplified method is used.
Can I switch from simplified to actual expenses next year?
Yes. Publication 587 says switching in a later year is allowed and is not a change in accounting method, but the election for the current year is irrevocable once made.
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