The Home Office Deduction: What Actually Qualifies

2026-07-23 · RKube Services

Regular and exclusive use, principal place of business, and simplified vs regular method: what the IRS actually requires for a home office deduction, with a worked example.

Every summer we get some version of the same question: "I work from my kitchen table most days. Can I write off part of my house?" Sometimes the answer is yes. Often it's "not the way you're set up right now."

The home office deduction is real and it can be worth a meaningful amount. But the rules are narrower than most people assume, and late July is a good time to check. You still have five months of the year to set the space up correctly and start keeping the records you'll need in April.

The Two Tests Most People Skip

1. Regular and exclusive use

The space has to be used regularly and exclusively for your business. Exclusive means exactly what it sounds like. A spare bedroom that's an office on weekdays and a guest room at Thanksgiving doesn't pass. Neither does the dining table.

It doesn't need to be a whole room. A clearly defined area of a room can qualify, as long as that area is used only for work. There are narrow exceptions to the exclusive-use rule, such as storing inventory or product samples and running a licensed daycare, but most people won't fall into them.

2. Principal place of business

The space also has to be your principal place of business, or a place where you regularly meet clients or customers, or a separate structure (like a detached studio) used for the business.

You don't have to do all your work there. If you use the home office for administrative or management tasks, such as billing, scheduling, and bookkeeping, and you don't have another fixed location where you do substantial amounts of that work, it can count as your principal place of business. A contractor who spends the day on job sites but does all the paperwork at home is a common example.

Who Generally Can't Take It

If you're a W-2 employee working from home, even full-time, you generally can't take this deduction on your federal return under current law. The deduction is for self-employed people, meaning sole proprietors, single-member LLCs, and freelancers filing Schedule C, plus certain other business owners.

If you own an S corporation and work from home, the usual approach is different: the company reimburses you for the business-use share of home costs under an accountable plan, rather than you claiming the deduction on your personal return. That needs to be set up properly, so talk it through with your tax preparer.

Simplified vs Regular Method

Once you qualify, there are two ways to calculate the deduction.

The simplified method is $5 per square foot of office space, up to 300 square feet. That caps it at $1,500. There's no depreciation, no expense tracking, and no Form 8829. You can still deduct your full mortgage interest and property taxes on Schedule A if you itemize.

The regular method takes the business-use percentage of your home (office square footage divided by total square footage) and applies it to actual costs: mortgage interest or rent, property taxes, insurance, utilities, repairs, and depreciation on the home itself. Direct costs that only benefit the office, like painting that room, are fully deductible. Schedule C filers calculate it on Form 8829.

A couple of things to know about the regular method. The depreciation you claim can be recaptured and taxed when you sell the house. And under either method, the deduction can't exceed the income from the business, although the regular method lets you carry over the excess to a future year and the simplified method doesn't.

You can choose either method each year.

Worked Example

Say a freelance designer owns a 2,000 sq ft home and uses a 250 sq ft spare room only as her office. That's 12.5% business use.

Simplified method: 250 sq ft × $5 = $1,250.

Regular method:

On paper the regular method wins by about $2,300. But the $2,000 of mortgage interest and property taxes moves from Schedule A to the business, so if she itemizes, part of that is just shifting where the deduction lands. The business portion does reduce self-employment income, though, which itemized deductions don't. And she's taking on depreciation recapture later. The right answer depends on the whole return, which is why we run both.

What to Do Before Year-End

• Measure the office and the home, and write both numbers down.
• Take a couple of photos showing the space is set up as an office.
• If the room is doing double duty, decide now whether to make it exclusive.
• Keep the year's utility bills, insurance declarations, and mortgage statements in one folder.

Source: IRS Publication 587, Business Use of Your Home and IRS: Simplified Option for Home Office Deduction

How RKube Helps

• We check whether your space actually meets the use and principal-place tests before you claim it.
• We calculate both methods and pick the one that fits your full return, not just the bigger number.
• For S-corp owners, we help set up an accountable plan so home-office reimbursements are handled correctly.
• We keep the business-use percentage and depreciation schedule consistent year to year, so a future home sale isn't a surprise.

If you'd like your books kept with this in mind, try our free 30-day bookkeeping trial or call (984) 234-7030: https://rkubeservices.com/campaign

Final Thoughts

The home office deduction isn't a red flag and it isn't a loophole. It's a deduction with specific tests. If your space passes them, document it and take it. If it doesn't, you've still got the rest of the year to fix that.

This is general information. Your own situation may have wrinkles, so talk to a tax professional before you file.

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