The Home Office Deduction, Without the Myths
You can deduct the cost of a part of your home used regularly and exclusively for business. The simplified method deducts $5 per square foot up to 300 square feet — a maximum of $1,500 — and the actual expense method deducts the business share of your real housing costs.
Two things to settle up front. Employees generally cannot claim this deduction at all, whatever their working arrangement. And it is not an audit red flag in the way people believe — but a room that fails the exclusivity test is a genuine problem.
Regular and exclusive use is the whole test
The space must be used regularly for business and exclusively for business. Both words carry weight, and exclusivity is where most claims fail.
Exclusive means the space is not used for anything else. A spare bedroom converted into an office qualifies. The dining table you work at and eat at does not. A desk in the corner of a bedroom can qualify if the deduction is limited to that identifiable area and it genuinely is not used for personal purposes — but the room around it is not part of the claim.
Regular means ongoing rather than occasional. Using the space a few times a year does not qualify, even if nothing else happens there.
Your home must also be your principal place of business, or a place where you substantially and regularly conduct business. The IRS is explicit that working elsewhere does not automatically disqualify you: if you also use your home substantially and regularly for the business, it can still qualify.
Simplified or actual: which to use
The simplified method multiplies $5 by the square footage used for business, capped at 300 square feet, for a maximum deduction of $1,500. It requires no allocation of household bills and no depreciation schedule.
The actual expense method deducts the business-use percentage of your real housing costs — mortgage interest or rent, utilities, insurance, repairs, and depreciation if you own. The percentage is usually the office's share of your home's square footage.
The arithmetic is straightforward: work out your business-use percentage, apply it to your annual housing costs, and compare against the simplified figure. If a 200 square foot office in a 2,000 square foot home is 10% of the space, and total housing costs are $30,000, the actual method yields $3,000 against the simplified method's $1,000. Where housing is expensive, the actual method usually wins by a wide margin, and the extra record-keeping is often the best-paid hour of the year.
One wrinkle for owners: the actual method includes depreciation, and depreciation claimed on a home office is subject to recapture when you sell. It is not a reason to avoid the method, but it is a reason to know it is coming.
Why your home office deduction might be zero
The deduction cannot exceed the gross income from the business use of your home, less your other business expenses. In plain terms: it cannot create or deepen a business loss.
If your business broke even or lost money, the home office deduction is limited to zero for the year, whichever method you use. The two methods then differ in an important way. Under the actual expense method, the disallowed amount can be carried over to a future year. Under the simplified method, the excess may not be carried over — it is simply lost.
That asymmetry is a real argument for the actual method in a lean year, and it is the answer to the common question of why a deduction that seemed obviously available produced nothing.
Is it an audit red flag?
This is the question that stops people claiming a deduction they are entitled to, and the honest answer is that the fear is dated. The home office deduction was once unusual and is now ordinary — remote and self-employed work made it common, and the simplified method exists precisely because the IRS wanted to reduce the burden of claiming it.
What is genuinely risky is a claim that does not meet the test. A room that is also the guest room, an office that is most of the house, or a deduction claimed on a home where little business actually happens — those are weak positions, and a weak position is a problem whether or not it attracts attention.
The right response is to claim it if you qualify and document it properly: measure the space, photograph it, keep the bills you allocated, and record how you arrived at the percentage. A well-supported claim is not something to be afraid of. An unsupported one is, and no amount of not-claiming-other-things offsets that.
Employees generally cannot claim it
Unreimbursed employee business expenses are not deductible for most employees under current law, and that includes a home office. Working from home full-time as a W-2 employee does not create a deduction, however much of your own space and electricity the arrangement consumes.
This catches people who read general advice about home offices without noticing it is written for the self-employed. If you receive a W-2, the practical route is an employer reimbursement under an accountable plan, which is not taxable to you, rather than a deduction on your return.
Someone with both a job and a side business can still claim a home office for the business, provided the space meets the exclusive and regular use test for that business — not for the employment.
What it is worth, and what else it unlocks
As with every Schedule C deduction, a home office reduces the profit that both income tax and self-employment tax are calculated on, so it is worth your marginal rate plus about 14.13%. A $3,000 deduction saves roughly $784 in the 12% bracket.
Qualifying also has a second effect people miss: with a home office as your principal place of business, trips from home to a client or job site are business miles rather than commuting. For someone making frequent local trips, that reclassification can be worth more than the home office deduction itself — the mileage deduction calculator prices those miles at both 2026 rates.
Our self-employed deductions guide covers the rest of the Schedule C picture.
Frequently asked questions
What qualifies for the home office deduction?
A part of your home used both regularly and exclusively for business, where your home is your principal place of business or a place you substantially and regularly conduct business. Exclusivity is the strict part: a dedicated room qualifies, a dining table used for work and meals does not. Working elsewhere too does not automatically disqualify you.
How much is the simplified home office deduction?
$5 per square foot of space used for business, capped at 300 square feet, so the maximum is $1,500 a year. It requires no allocation of household bills and no depreciation schedule. The trade-off is that any amount disallowed by the gross income limit cannot be carried forward, unlike under the actual expense method.
Is the home office deduction an audit red flag?
Not in the way the folklore suggests. It is now a common deduction, and the IRS created the simplified method specifically to make claiming it easier. What creates real risk is a claim that fails the exclusive-use test — a room that doubles as a guest room, or an office that is implausibly large relative to the home. Claim it if you qualify, and document the space and the allocation.
Why is my home office deduction zero?
Because it cannot exceed the gross income from the business use of your home less your other business expenses — it cannot create or deepen a loss. If the business broke even or lost money, the deduction is limited to zero. Under the actual expense method the disallowed amount carries over to a future year; under the simplified method it does not, and is lost.
Can employees claim the home office deduction?
Generally no. Unreimbursed employee business expenses are not deductible for most employees under current law, so working from home on a W-2 does not create a deduction. The practical alternative is an employer reimbursement under an accountable plan. Someone with a side business can still claim a home office for that business if the space meets the test.
Should I use the simplified or actual expense method?
Compare them. Work out your office's share of your home's square footage and apply it to your annual housing costs — mortgage interest or rent, utilities, insurance, repairs, and depreciation if you own. A 10% office in a home with $30,000 of costs yields $3,000 against the simplified method's $1,000 at that size. Where housing is expensive, actual usually wins comfortably.
Sources
We prioritize primary sources for rules, formulas, rates, limits, and definitions. See our calculator methodology and editorial policy.