Home Office Deduction: Rules, Calculation and Mistakes

The home office deduction lets a self-employed person in the United States deduct the business share of home costs, such as rent, utilities and insurance, from business income on Schedule C. You qualify only if part of your home is used regularly and exclusively for your business, and it is your principal place of business, a place where you meet clients or customers, or a separate structure used for the business. There are two ways to calculate it: a simplified flat rate per square foot, or the actual business share of your costs. This guide sets out the IRS tests, works both methods through with real numbers so you can see when each wins, lists the mistakes that cost people the deduction, and covers the UK equivalent for sole traders. It is general information for the 2025 tax year rules as published by the IRS and HMRC, not tax advice.

Who qualifies for the home office deduction?

You need to pass a use test and a location test. According to IRS Publication 587 (2025), Business Use of Your Home, the area must be used:

• Exclusively: only for your trade or business. A spare bedroom that is also the guest room fails; a desk in the corner of the living room fails unless that part of the room is used for nothing else.
• Regularly: "incidental or occasional business use is not regular use".

And it must be at least one of these:

The principal place of business rule matters for trades. IRS Publication 587 gives the example of a self-employed plumber who spends most of the day at customers' sites but uses a small home office exclusively and regularly for the business's administrative work, such as phoning customers, ordering supplies and keeping the books, with no other fixed location for that work: that home office qualifies as the principal place of business.

Two exceptions to the exclusive-use test exist: storing inventory or product samples if you sell products at wholesale or retail and your home is your only fixed location, and certain daycare facilities (Publication 587). Everything else must meet the exclusive-use test.

Employees get no deduction for using part of their home for their job. Publication 587's flowchart ends at "No deduction" for anyone using the space as an employee. If you are both an employee and self-employed, only the self-employed business can claim, and only for space that meets the tests for that business.

Simplified or regular method: how do they compare?

The simplified method is quicker and capped; the regular method takes more records and has no fixed cap. These are the IRS rules for each (IRS, Simplified option for home office deduction, page reviewed March 2, 2026):

You choose the method each year on your timely filed original return, and you cannot change it for that year afterwards. You can use a different method in a later year.

Worked example: a renter with a 180-square-foot office

These are illustrative figures for a hypothetical freelance designer who rents a 1,200-square-foot apartment and uses a 180-square-foot second bedroom only as an office.

The regular method is worth $3,276 more here, because rent is high and the office is a large share of a small home. Both amounts reduce net profit on Schedule C, which is the base for income tax and for self-employment tax, charged at 15.3% according to the IRS self-employment tax page.

The simplified method wins when the office is small, rent or ownership costs are low, or you do not want to keep the records. A 100-square-foot nook in a 2,500-square-foot home with $1,800 a month in costs is 4% business use: $864 a year by the regular method against $500 by the simplified one. The gap is small enough that many people would take the simplified method and skip Form 8829.

Where does the income limit bite?

When the business is small. Suppose a side business earned $3,000 gross and had $2,400 of other business expenses. The home office deduction is limited to $600. Under the simplified method, a 180-square-foot office ($900) is capped at $600 and the other $300 is lost. Under the regular method, the disallowed amount carries forward to the next year in which you use actual expenses. So in a low-profit year, the regular method can be the better choice even if the simplified figure looks close.

What happens when a homeowner sells after using the regular method?

Depreciation follows you to the sale. If you own your home and use the regular method, you deduct depreciation on the business part. When you sell, Publication 587 says you cannot exclude the part of any gain equal to the depreciation you were allowed, or could have been allowed, for periods after May 6, 1997. In other words, the main-home gain exclusion does not shelter the depreciation, and tax is due on that part of the gain.

The simplified method avoids this: there is no depreciation deduction and no later recapture for the years you use it. For a homeowner expecting a large tax-free gain on sale, that is a real reason to compare both methods with an adviser before choosing the regular one.

Which home office mistakes lose the deduction?

• Claiming a shared room. A room that is also the guest room, the gym or the kids' homework space fails the exclusive-use test.
• Measuring the whole room when only part is used. Measure the area used only for business and keep a sketch with dimensions.
• Claiming as an employee. Remote employees get no federal deduction for their employer's work, even if the employer requires them to work from home.
• Going over the income limit with the simplified method. The excess is lost, not carried over.
• Deducting whole-home costs at 100%. Indirect expenses for the whole home, such as a roof repair, are deducted at the business percentage. Direct expenses for the office area alone are fully business. Form 8829 has separate columns for the two.
• Double-counting. Under the simplified method, the business use of the home is already covered; you cannot also deduct the business share of rent or utilities.
• No records. Keep the floor plan, photos of the space, and a year of rent, utility and insurance statements, whichever method you use; Form 8829 needs the actual figures.

How does the UK handle working from home for the self-employed?

HMRC lets sole traders and partnerships with no company partners use simplified expenses, a flat monthly rate for working from home instead of working out the business share of household bills. Limited companies cannot use them, and the scheme is optional (GOV.UK, Simplified expenses). The flat rates are (GOV.UK, Working from home):

A sole trader working 120 hours a month at home for the whole year can claim £26 × 12 = £312. The flat rate covers household costs such as utility bills but not telephone or internet, which you can claim separately at their actual business share. Fewer than 25 hours a month means simplified expenses for home working cannot be used. A sole trader with higher real costs can instead work out the business proportion of actual bills, as with the US regular method.

Where does invoicing fit in?

Your invoices are the record of the gross income that the home office deduction is limited by, and they show your business address. InvoiceQuickly lets you type any address in the "from" details, so you can show a business address or mailbox rather than your home if you prefer, as long as clients can reach you and it meets any rules that apply to your business. On Pro ($9/month), the CSV export lists each invoice's total and the date it was paid, which helps you total the year's invoiced income for your preparer; credit notes and estimates appear in the same export, so filter them out. On Pro you can also record expenses such as rent and utilities, but InvoiceQuickly does not work out the business-use share, keep a mileage log or prepare tax forms. For what belongs on an invoice, see what to include on an invoice.

When is this guide not enough?

• You own your home and plan to sell it. Depreciation and the gain exclusion interact; get advice before choosing the regular method.
• Your business is a corporation or partnership. Partners use a separate worksheet in Publication 587 rather than Form 8829, and business owners who are employees of their own corporation fall under the employee rules.
• You run a daycare or store inventory at home. Special rules and time-based calculations apply.
• You use the space for more than one business, or moved during the year. The calculations are per business use and per home.
• You live outside the US and UK. Rules differ; check your tax authority.

This is general information based on IRS Publication 587 (2025) and GOV.UK guidance, checked on October 27, 2026. It is not tax advice. Rules and amounts can change; confirm with the IRS, HMRC or a tax professional before filing. Last reviewed: October 27, 2026.

For other costs freelancers can claim, see freelance tax deductions. For paying the tax that is left, see quarterly tax payments and the self-employment tax guide.

Frequently asked questions

Can you get a tax deduction for a home office?

In the US, yes if you are self-employed and use a specific area of your home regularly and exclusively for the business, and it is your principal place of business, a place where you meet clients or customers, or a separate structure. Employees get no federal deduction for working from home for their employer.

How much can I claim for a home office?

With the IRS simplified method, $5 per square foot for up to 300 square feet, so up to $1,500. With the regular method, the business percentage of your actual rent or mortgage interest, utilities, insurance, repairs and depreciation, limited by the income from the business. In the UK, HMRC's flat rate is £10 to £26 a month depending on hours.

What is the maximum home office deduction?

Under the simplified method, $1,500 a year (300 square feet at $5). The regular method has no fixed maximum, but the deduction for certain expenses cannot exceed the gross income from the business use of the home less other business expenses; the excess carries forward.

Do I need Form 8829?

If you file Schedule C and use the regular method, yes: Form 8829 calculates the deduction, which then goes to Schedule C, line 30. With the simplified method you use the simplified worksheet instead.

Can I switch between the simplified and regular methods?

Yes, from one year to the next. You choose by using a method on your timely filed original return, and you cannot change it for that same year later. If you return to the regular method after using the simplified one, depreciation is figured using the IRS's optional tables.

Does the home office deduction reduce self-employment tax?

Yes. It reduces your net profit on Schedule C, and self-employment tax, at 15.3%, is calculated from net earnings from self-employment, so a lower profit means lower self-employment tax as well as lower income tax.

Keep your invoices, and the income record they create, in one place: start free.