The home office deduction lets you write off part of your housing costs against your business income. The catch that catches most people is who it applies to. If you work from home for an employer, the IRS decision chart sends you straight to “No deduction”. It is a deduction for self-employed people, and the rules about what counts as a home office are stricter than most guides admit.
Key takeaways
- Employees do not qualify. IRS Publication 587’s decision chart asks “Are you using the part of your home as an employee?” and routes a yes answer to “No deduction”.
- The space must be used “exclusively on a regular basis” for business. A desk in the corner of a room you also live in does not meet that test.
- The simplified method is $5 per square foot on up to 300 square feet, so the most it can produce is $1,500 a year.
- The regular method has no cap but needs Form 8829 and real records of what your home costs to run.
- The deduction cannot create a loss. It is capped by the gross income from the business use of your home.
- Figures here come from IRS Topic 509 and Publication 587, which is written for preparing 2025 returns. Check the current edition before you file, and talk to an accountant about your own situation.
What is the home office deduction?
It is a deduction that lets a self-employed person treat part of their home’s running costs as a business expense.
The logic is simple. If a tenth of your home is given over entirely to running your business, then a tenth of what it costs to keep that home going is arguably a cost of the business rather than a cost of living. The home office deduction is the mechanism for claiming that share, and the IRS gives you two ways to work it out.
What it is not is a write-off for having a laptop on the kitchen table. The rules below are the reason most people who think they qualify do not.
Who qualifies for the home office deduction?
Self-employed people who use part of their home exclusively and regularly for business. Employees do not qualify at all.
That second sentence is the one worth reading twice. The decision chart in IRS Publication 587 asks “Are you using the part of your home as an employee?” and a yes answer goes to a box marked “No deduction”. Working from home for a company, even full time, even if the company provides no office at all, does not put you in scope. A few narrow categories of employee are treated differently elsewhere in the tax code, so if you think your situation is unusual, ask an accountant rather than assuming either way. In our reading of this topic it is the misunderstanding most likely to cost someone money, though we have no survey data on how often it happens.
If you are self-employed, IRS Topic 509 sets out the tests. The space has to be used:
- “Exclusively on a regular basis as your principal place of business for your trade or business”, or
- “Exclusively on a regular basis as a place where you meet or deal with your patients, clients, or customers in the normal course of your trade or business”, or
- As “a separate structure that’s not attached to your home, used exclusively on a regular basis in connection with your trade or business”, or
- “On a regular basis for storage of inventory or product samples used in your trade or business of selling products at retail or wholesale, so long as your home is the sole fixed location of such trade or business”, or
- “For rental use”, or
- “As a daycare facility”.
Read that fourth one carefully, because it is narrower than it looks. The storage use only applies if you sell products at retail or wholesale and your home is the only fixed location of that business. A consultant with a cupboard of samples does not qualify under it, and neither does a retailer who also has a shop.
Exclusive use is the strictest of the tests. It means the space is used for business and nothing else. A spare room that is only ever your office qualifies. The same room with a sofa bed for visiting relatives does not, because it has a personal use as well.
There are two carve-outs, not one. Topic 509: “You also may take deductions for business storage purposes when the dwelling unit is the sole fixed location of the business or for regular use of a residence for the provision of daycare services; exclusive use isn’t required in these cases.” Publication 587 groups them under a heading called “Exceptions to Exclusive Use”. Both are narrow and conditional, so neither is general permission to share the space.
The two ways to calculate the home office deduction
The simplified method trades accuracy for paperwork. The regular method trades paperwork for a bigger number.
The simplified method
Topic 509 states the rate plainly: “$5 per square foot of the portion of the home used for business (up to a maximum of 300 square feet)”. Multiply your business square footage by five and stop. Because the cap is 300 square feet, the arithmetic means this method can never produce more than $1,500 in a year, whatever your actual costs are.
It exists to save you from record-keeping. The IRS says its simplified option “can significantly reduce the burden of recordkeeping”, and that is the honest reason to pick it: you do not need to track your utility bills, your insurance or your repairs for this purpose.
Mortgage interest is the exception, and it matters. Under the simplified method Publication 587 says to “treat as personal expenses your mortgage interest, real estate taxes, and casualty losses”, and Topic 509 confirms those costs “are allowed in full on Schedule A (Form 1040), Itemized Deductions”. So they do not vanish, they move, and they help you if you itemize. Do not stop tracking them.
The regular method
The regular method works out what proportion of your home the office occupies, then claims that proportion of your actual home running costs. There is no $1,500 ceiling, so for anyone with a genuinely large office or expensive housing it usually produces a bigger deduction. Depreciation is part of that. Topic 509 says of the simplified option that “depreciation is treated as zero”, and says the allowable costs for business use of a home include “the business portion of real estate taxes, mortgage interest, rent, casualty losses, utilities, insurance, depreciation, maintenance, and repairs”.
The trade is administrative. You file Form 8829, Expenses for Business Use of Your Home, and you need records behind every figure on it.
How to calculate the home office deduction
Measure the space, divide it by the size of your home, and apply that percentage to whichever method you chose.
Take a consultant working from a 12 by 10 foot spare room, so 120 square feet, in a 1,500 square foot house. The business-use percentage is 120 divided by 1,500, which is 8 percent.
Under the simplified method the calculation ignores the percentage entirely: 120 square feet times $5 is a $600 deduction, and no receipts are needed.
Under the regular method you would apply that 8 percent to your actual annual costs of running the home, the categories Form 8829 asks for. If those come to $24,000 across mortgage interest, insurance, utilities, repairs and the rest, 8 percent is $1,920. In that example the regular method is worth about three times the simplified one, which is the trade-off in a sentence: more paperwork, more deduction.
Neither figure is a refund. A deduction reduces the income you pay tax on, so what it is actually worth to you depends on your tax rate. It is worth putting alongside your other running costs when you plan the year, in the same way you would budget for what you spend on marketing.
What home office expenses are tax deductible?
Under the regular method, the business-use share of what it costs to run the whole home.
Form 8829 is organised around these categories, and homeowners insurance is one of them, which answers a question people ask a lot: yes, the business-use percentage of your homeowners insurance is deductible under the regular method, along with utilities, repairs and maintenance, rent if you rent, and mortgage interest and real estate taxes if you own. Depreciation is also available under the regular method and is not available under the simplified one.
Two boundaries matter. Costs that belong entirely to the office space, such as painting that room, are treated differently from costs that cover the whole house and get apportioned. And a cost with no connection to the home’s operation is not a home office expense at all, though it may well be an ordinary business expense claimed elsewhere on your return.
The limit nobody mentions: it cannot create a loss
The home office deduction is capped by the income the business makes.
Topic 509 refers to this as the “gross income limitation”, and Publication 587 explains the shape of it: if the gross income from the business use of your home equals or exceeds your total business expenses including depreciation, you can deduct all your business expenses related to the use of your home. If it does not, your deduction is limited. You cannot use the home office deduction to manufacture a loss that shelters other income.
In practice that means a side business with thin revenue may not get the full benefit in the year it incurs the cost. This is one of several reasons the deduction is worth discussing with an accountant rather than estimating yourself.
Where the home office deduction goes on your return
Sole proprietors compute it on Form 8829 or the Simplified Method Worksheet, and it lands on Schedule C.
Publication 587 is explicit that if you file Schedule C (Form 1040), you use “either Form 8829 or the Simplified Method Worksheet in your Instructions for Schedule C”. So the answer to where it appears on the 1040 is indirect: it reduces your Schedule C profit, and that profit flows onto the 1040. There is no separate home office line on the front of the return.
If you elect the simplified option, Topic 509 is specific about how: “Instead of using Form 8829, the taxpayer indicates the taxpayer’s election to use the safe harbor option by making two entries directly on the Schedule C for the square footage of the home and the square footage of the office.”
What records to keep
Enough to prove the space qualifies, and enough to prove every number you put on Form 8829.
The simplified method removes most of this burden by design, which is its whole purpose. You still need to be able to show the square footage and that the space met the exclusive and regular use tests, but you are not tracking bills.
The regular method is the one that needs a filing habit. Practically, that means keeping through the year:
- Measurements of the office and of the whole home, with how you arrived at the business-use percentage.
- Annual totals for each cost Form 8829 asks about, including mortgage interest or rent, real estate taxes, homeowners insurance, utilities, and repairs and maintenance.
- Invoices for anything spent on the office space alone, kept separately from whole-home costs, because the two are apportioned differently.
- For owners, the figures behind any depreciation claimed, since depreciation is available under the regular method and not under the simplified one.
The reason to decide early rather than in filing week is that the regular method cannot be reconstructed from memory. If you have not kept the bills, the simplified method is the one still available to you.
Common mistakes with the home office deduction
Four errors account for most of the trouble. Two are about whether you qualify at all, and two are about how much the deduction is actually worth.
Assuming that working from home is enough. It is the employee question again, and it is worth stating once more because remote work made it so common. Publication 587’s chart routes employee use to “No deduction”, full stop.
Treating a shared room as exclusive. The standard is exclusive use, not main use. A dining table you clear at six o’clock is not a home office for this purpose no matter how many hours you work at it. In our reading it is also the test most likely to be contested, because it turns on how the room is actually used rather than on a number you can document.
Expecting a refund rather than a deduction. A $1,500 deduction does not put $1,500 in your pocket. It reduces the profit you are taxed on, so its cash value depends on your rate.
Forgetting the income limit. The gross income limitation means a business with little revenue may not be able to use the whole deduction in the year it arises, which surprises people running a new side business at a loss.
Underlying all four is a simpler point. The home office deduction is one of the few write-offs where the eligibility question is harder than the calculation, so the time is better spent confirming you qualify than optimising which method to use.
If the home office is where you run the business from, it is also worth making sure customers can actually find that business. Grants, deductions and funding all assume revenue exists in the first place, and for most small operations that starts with being findable locally. Self-employed readers looking at funding rather than tax relief may also want our guide to small business grants for women.
Frequently asked questions
What is a tax deduction for home office?
It is a deduction that lets a self-employed person claim part of their home’s running costs as a business expense, based on the portion of the home used exclusively and regularly for the business. You can take a flat $5 per square foot on up to 300 square feet, or claim the business-use share of your actual home costs.
How to claim a home office tax deduction?
Confirm you are self-employed rather than an employee, confirm the space is used exclusively and regularly for business, then choose a method. The simplified option uses the Simplified Method Worksheet in the Schedule C instructions. The regular method uses Form 8829. Either way the result reduces your Schedule C profit.
How much can I deduct for business use of home?
Under the simplified method, $5 per square foot on a maximum of 300 square feet, which caps the deduction at $1,500. Under the regular method there is no fixed cap; you deduct the business-use percentage of your actual home expenses. Both are limited by the gross income from the business use of your home.
What qualifies as a home office for tax purposes?
Space used exclusively and regularly as your principal place of business, or where you meet clients or customers in the normal course of business, or a separate unattached structure used for the business. Topic 509 also lists rental use, use as a daycare facility, and regular storage of inventory or product samples, though that last one applies only if you sell at retail or wholesale and your home is the sole fixed location of that business. Exclusive use means no personal use of that space at all. There are two exceptions to exclusive use, storage where the home is the sole fixed location of the business, and daycare.
Is homeowners insurance tax deductible for a home office?
The business-use share of it is, under the regular method. Homeowners insurance is one of the whole-home costs Form 8829 apportions by your business-use percentage. Under the simplified method it is not claimed separately, because the $5 per square foot rate is intended to stand in for those costs.
Is the home office deduction monthly or yearly?
Yearly. It is calculated for the tax year and claimed on that year’s return. The $5 per square foot rate and the 300 square foot cap are annual figures, not monthly ones.
Can the home office deduction create a loss?
No. It is subject to what the IRS calls the gross income limitation, so it cannot reduce your business income below zero to shelter other income. Where the limitation bites, part of the deduction may not be usable in that year.
Can employees claim the home office deduction?
No. IRS Publication 587’s decision chart asks whether you are using the part of your home as an employee, and routes that answer to “No deduction”. Working from home for an employer does not qualify you, regardless of whether your employer provides an office.
Which tax year do these figures apply to?
The figures here come from IRS Topic 509 and from Publication 587, whose current edition is written for use in preparing 2025 returns, both read on 31 August 2026. The IRS republishes Publication 587 each year, so check the edition for the year you are filing before you rely on any number, and speak to an accountant about your own circumstances. This article is general information, not tax advice.
Sources
- Internal Revenue Service, Topic no. 509, Business use of home, read 31 August 2026.
- Internal Revenue Service, Publication 587, Business Use of Your Home, edition for use in preparing 2025 returns, read 31 August 2026.
- Internal Revenue Service, About Form 8829, Expenses for Business Use of Your Home, read 31 August 2026.
- Internal Revenue Service, Home office deduction, read 31 August 2026. The IRS designates this page as historical and last reviewed it on 11 September 2024, so the one line quoted from it is cross-checked against Topic 509 and Publication 587, both of which are current. Links to Form 8829 go to the maintained form page instead.
