The home office deduction has always been one of the most misunderstood and mis-claimed deductions in the tax code. The IRS updated its surrounding guidance in 2025, effective for 2026 returns, and there are practical implications for how you should document and calculate your deduction.
The regular and exclusive use rule hasn’t changed — but enforcement is sharper
To claim a home office deduction, the space must be used regularly and exclusively for business. This has always been the rule. What’s changed is that recent IRS guidance has made clear that “exclusive” means exactly that — a dedicated workspace, not a corner of a room that also serves as a guest bedroom or a dining table you sometimes work at.
If your office is a separate room used only for business, you’re fine. If you’re claiming a percentage of your living room, you’re exposed.
The simplified method: still $5 per square foot, max 300 sq. ft.
The simplified method lets you deduct $5 per square foot of your home office, up to 300 square feet — a maximum deduction of $1,500. Nothing changed here.
What did change is the IRS’s documentation expectations. Under recent guidance, using the simplified method does not eliminate your record-keeping obligation. You still need to document the square footage of your office and the total square footage of your home, and you need to be able to show that the space qualifies under the regular-and-exclusive-use rule.
The actual expense method: more work, typically more money
The actual expense method lets you deduct the percentage of actual home expenses — mortgage interest, property taxes, utilities, insurance, repairs — that corresponds to your office’s share of the total home square footage.
For most business owners with a meaningful home and a legitimate office, this method produces a higher deduction than the simplified method. The tradeoff is complexity: you need to track actual expenses, calculate the home office percentage, and apply it correctly across different expense categories.
Hybrid and partial-year scenarios
If you moved during 2026, or if your workspace changed during the year — you renovated, you rented office space for part of the year, or your business use changed materially — calculate the deduction on a prorated basis rather than applying a full-year rate.
Remote employees cannot claim a home office deduction at all. If you’re a W-2 employee working from home for an employer’s convenience, there is no home office deduction available under current law. The deduction is available to self-employed individuals and business owners only.
What to document
Regardless of which method you use, document the following:
- A photograph or floor plan of the workspace
- The square footage of the office and the total home
- A brief written description of how the space is used — what business activities, how frequently, and whether any personal use occurs
If the space truly qualifies, this documentation takes under 30 minutes to put together. It’s the difference between a deduction that survives scrutiny and one that doesn’t.
If you claimed a home office deduction on your 2026 return and have any uncertainty about whether it was properly documented, that’s worth addressing now — while the return is still within the normal lookback period.
