There's a stubborn piece of folklore that says claiming a home office is like painting a target on your tax return. It made a kind of sense decades ago. Today it's mostly wrong — millions of self-employed people claim it every year, and it's a routine, legitimate deduction. The thing that actually gets people in trouble isn't claiming it; it's claiming it without meeting the rules, or without being able to back it up.
So let's replace the paranoia with the actual requirements: who qualifies, the two ways to calculate it, and the documentation that makes the whole question boring.
A note up front: this is general information for U.S. self-employed filers, not advice on your return — check specifics with a CPA or EA.
Who actually qualifies
Two gates, and you have to clear both.
You're self-employed. This is the big one people miss: since the 2017 tax law, W-2 employees can't take the home office deduction — not even if you work from home full-time. (And the disallowance of unreimbursed employee expenses is now permanent.) The deduction is for the self-employed — sole proprietors, freelancers, independent contractors filing Schedule C. If you're an employee who works remotely, this isn't yours, full stop.
The space is used regularly and exclusively for business. "Exclusively" is the word that trips people up. A spare room you use only as your office qualifies. The kitchen table where you also eat dinner does not. A desk in the corner of your bedroom is a gray area at best. The space has to be your principal place of business (or a place you regularly meet clients), and it has to be used for work and only work. This is the requirement most casual claims fail — and the one worth being honest with yourself about.
Renters qualify too, for the record — you don't have to own the home.
The two methods
If you qualify, there are two ways to calculate the deduction.
The simplified method. Multiply the square footage of your office by $5, up to a maximum of 300 square feet — so the most you can deduct this way is $1,500. A 200-square-foot office is a $1,000 deduction. No Form 8829, no tracking utility bills, no depreciation math. You just need to know the size of the space. It's the low-effort option, and for a smaller office it's often plenty.
The regular method. You calculate the business-use percentage of your home — your office's square footage divided by your home's total — and apply that percentage to your actual home costs: mortgage interest or rent, utilities, insurance, repairs, and depreciation. This runs on Form 8829 and takes real recordkeeping, but for a larger space or a high-cost home it can produce a deduction well above the $1,500 cap.
A few mechanical points worth knowing: under the simplified method there's no depreciation and no carryforward of an unused deduction. The regular method allows depreciation — but that depreciation is recaptured (taxed) when you sell the home, which is a real consideration for homeowners. And under either method, the deduction can't exceed the gross income from your business; you can't use a home office to manufacture a loss.
Which method to use
The trade-off is the familiar one: simplicity versus size.
Simplified makes sense when your office is on the smaller side, your home costs are modest, or you simply value not keeping another set of records. For a 150-square-foot home office, the simplified $750 may be close to what the regular method would yield anyway, without the paperwork.
Regular tends to win when you have a larger dedicated space, high housing costs (a big mortgage or rent, expensive utilities), and you're willing to track the actual expenses across the year. For many people with a genuine, sizable home office, the regular method clears the $1,500 cap comfortably — sometimes by a lot.
You can choose a different method each year, so it's worth running both annually as your space and costs change. You just can't switch methods for the same year once you've filed it.
The documentation that kills the paranoia
Here's how you make the audit worry evaporate: keep the records that prove what you claimed. None of it is onerous.
- Measure the space and keep the number. Square footage is the basis of both methods.
- Photograph your home office. A couple of photos showing a dedicated workspace is the simplest evidence of exclusive use.
- For the regular method, keep the bills — mortgage interest or rent, utilities, insurance, repairs — through the year, not reconstructed in April.
- Keep it all for years. The IRS can look back at a return for a few years (longer in some cases), so the supporting records need to survive that long, somewhere you can actually find them.
That last point is the quiet one. A deduction you claimed in 2026 might need substantiating in 2029, and "I think the office was about 200 square feet and here are some utility bills I dug out" is a weaker position than a clean, dated folder. Capturing those records as you go and keeping them somewhere durable — for me, that's why Starlog files expense records into your own Google Drive rather than a place you lose access to — is what turns the home office deduction from a worry into a footnote.
The bottom line
The home office deduction is normal, legitimate, and worth real money to the self-employed. It is not an automatic audit trigger. Qualify honestly (self-employed, exclusive and regular use), pick the method that gives you the bigger number — simplified at $5/sq ft up to $1,500, or the regular method for larger spaces — and keep the documentation to back it up. Do that and there's nothing to be paranoid about.