Can a Contractor Claim the Home Office Deduction?

Yes. A contractor who does the work at customers' homes can still deduct a home office if a space is used exclusively and regularly for the business's administrative work, such as billing, scheduling and bookkeeping, and there's no other fixed location for it. The simplified method allows $5 per square foot, up to 300 square feet, or $1,500 a year.

How the home office deduction works for contractors

Most contractors assume the home office deduction is for people who sit at a desk all day. It isn't. The IRS lets you deduct the business use of your home when a part of it is your principal place of business, and since 1999 the rules have said a home office counts as your principal place of business if you use it for the administrative or management work of the business and have no other fixed location where you do substantial amounts of that work.

Publication 587 spells this out with Sid, a self-employed plumber. Sid spends most of the day at customers' homes installing and repairing plumbing. Sid has a small home office used exclusively and regularly for phoning customers, ordering supplies and keeping the books. Sid writes estimates at customers' premises and uses an outside bookkeeping service for billing. The IRS's conclusion: Sid's home office qualifies as the principal place of business, and the expenses are deductible. That's most owner-operators in the trades.

The tests your space has to pass

1. 1

   Exclusive use.

   The area is used only for the business. It doesn't have to be a whole room or have a door, but it must be a separately identifiable space. A desk your kids also use for homework fails. Publication 587 gives an exception only for storing inventory or product samples when you're in retail or wholesale, which most contractors aren't.

2. 2

   Regular use.

   You use it for business on a continuing basis. Occasional or incidental use doesn't count.

3. 3

   Principal place of business, or another qualifying use.

   It qualifies if you do your administrative or management work there (billing, scheduling, ordering, books, payroll) and have no other fixed location where you do substantial amounts of that work. Doing estimates on site, having a bookkeeper bill from their office, or working from your truck doesn't disqualify you. Alternatively, the space qualifies if you meet customers there in the normal course of business, or if it's a separate structure used for the business.

What breaks it: renting a shop with an office where you do the paperwork, or having suitable admin space at a shop and choosing to work from home anyway. Per Publication 587, if you have another fixed location with suitable space for administrative work, the home office isn't your principal place of business.

Two ways to figure the deduction

Deduction = (Office sq ft ÷ Home sq ft) × Indirect home expenses + 100% of direct office expenses

Garages, shops and other separate structures

Publication 587 treats a separate free-standing structure, such as a workshop, garage or barn, as deductible if you use it exclusively and regularly for the business. It doesn't have to be your principal place of business or a place where you meet customers. A detached garage you've turned into a tool crib and fabrication space, used only for the business, counts. An attached garage is part of the home: the portion used exclusively for business can be included in your business percentage, but a bay that also holds the family car doesn't qualify.

Improvements that benefit only the business space, like shelving built into the shop or a dedicated electrical sub-panel, are depreciated separately at the business percentage. Under Publication 587, improvements to the home made this year use a 39-year recovery period.

Why the home office matters for your mileage

There's a second payoff. Per Publication 463, if your home office qualifies as your principal place of business, you can deduct daily transportation between your home and another work location in the same business. Without it, the drive from home to the first job of the day can be nondeductible commuting. For a contractor driving 15,000 business miles a year, at the 2026 rates of 72.5¢ (January–June) and 76¢ (July–December), that's a deduction worth over $11,000 that partly hinges on the home office qualifying. See the mileage deduction.

Deducting tools and equipment

Tools are deducted separately from the home office, on Schedule C or Form 4562, and you don't need a home office to claim them. Three paths, depending on the cost:

Home office by trade

Common mistakes

• Claiming a shared space. The kitchen table and the family computer desk don't pass the exclusive-use test, no matter how much work you do there.
• Claiming the home office and a rented shop office. If you have suitable admin space at another fixed location, the home office isn't your principal place of business.
• Including the whole garage when one bay holds the family car.
• Skipping the deduction out of audit fear. The simplified method is a single line on Schedule C, with square footage as the only record. If the space qualifies, claim it.
• Forgetting the gross income limit. In a loss year, the home office deduction (other than mortgage interest and taxes you'd deduct anyway) can't push the business further into a loss; under the regular method the excess carries forward.
• Forgetting recapture. Depreciation claimed under the regular method is recaptured when you sell the house. The simplified method avoids that.

See the full contractor tax deductions list, the contractor taxes guide, and how BRIX bookkeeping and tax help works.