Home office deduction records: measurements, bills and proof of use
By Arthur Teboul, DokuTrak · Published
In brief
Tax deductions for a home office rest on two kinds of proof: that the space is used regularly and only for your business, and what the home costs to run. The simplified method needs little more than the square footage and the months of use; Form 8829 needs the full year of home bills.
The checklist: Home office proof file: space, use and bills
Tick the method for this tax year first: simplified or Form 8829. The first two groups apply to both; the home bills apply only to Form 8829.
- PDFPrint it or tick it off on screen.Free, no email
- WordEdit it and send it under your name.Free, with your email
- Excel trackerOne row per item, with a status column.Free, with your email
Build your own list: Answer 10 yes-or-no questions and the tax document checklist generator combines the lists that apply into one checklist.
Eligibility and use
- Note of the business that uses the officeSchedule C business, partnership, or the company that reimburses you
- Dated photos of the office set up for workShowing no personal use of the space
- Where admin and billing are doneAnd any other fixed place you work from
- Calendar of client meetings at home, if anyDates and who came
- Inventory or sample storage area, if claimedLocation and size; exempt from the exclusive-use test
Measurements and dates
- Office square footageLength and width, plus any storage area used
- Total home square footageFrom the lease, appraisal or your own measure
- Floor sketch with both figuresA hand drawing is fine
- Months the office was in useStart or end date if not the whole year; mark months under 15 days
Home bills (Form 8829 only)
- Lease and proof of rent paidRenters: all months of the year
- Form 1098, Mortgage Interest StatementOwners: one per loan on the home
- December mortgage statementBacks up interest if no Form 1098 arrived
- Property tax billWith proof of payment for the year
- Homeowners or renters insurance declarationsPremium for the policy year
- Utility bills: power, gas, water, trashTwelve months of each
- Second phone line used only for businessBills for the year; the first landline stays personal
- Repair invoices, marked office-only or whole-homeDate and what was done
Prior years and sale records
- Last year’s Form 8829 and returnFor carryovers and past depreciation
- Closing statement from the home purchaseOwners: price, costs and land value
- Receipts for home improvementsKept for as long as you own the home
Who can claim it, and who cannot
The deduction belongs to people who run a business from home, such as a sole owner filing Schedule C. The space must be used regularly and only for the business (IRS Publication 587 (2025)). It must also be one of three things: your principal place of business, a place where you meet clients or customers in the normal course of business, or a separate structure used for the business (IRS Publication 587 (2025)). Renters qualify as well as owners, and a home can be a house, apartment, condo, mobile home or boat (IRS Publication 587 (2025)).
An employee who works from home is a different case. Publication 587 asks whether you use the space as an employee, and if so sends you to no deduction (IRS Publication 587 (2025)). Unreimbursed employee costs are miscellaneous itemized deductions, and the law bars them for every tax year after 2017 (26 U.S.C. 67). Your state may differ, so check its return.
Owners of an S corporation who work in it are its employees, so the same bar applies to them. The usual route is a payment from the company under an accountable plan, a written policy under which the owner proves each cost and returns any excess (IRS Publication 463 (2025)). Partners do not use Form 8829 either; they figure the amount on the worksheet in Publication 587 (IRS Publication 587 (2025)).
Proving the space: size, use and purpose
Exclusive use means a specific area of the home is used only for the business (IRS Publication 587 (2025)). A desk in the corner of a guest room you also use for visitors fails the test. Two cases are exempt from it: storage of inventory or product samples, and a home daycare (IRS Publication 587 (2025)).
Proof of use is mostly simple paper. Measure the office and the whole home, sketch a floor plan with the numbers, and take dated photos that show the room set up for work. If clients come to the office, a calendar of meetings helps.
A principal place of business is where you do the main work, or where you do the admin and management with no other fixed place to do it (IRS Publication 587 (2025)). For example, a plumber who works at client homes but does billing and scheduling only in a home office can meet the test. Note where the admin work happens, since it also affects whether drives from home count, as the mileage log checklist explains.
Simplified method or Form 8829: the records each needs
You choose a method each year on a timely filed original return, and the choice for that year cannot be changed (IRS Publication 587 (2025)). The simplified method is a flat rate per square foot that replaces the home bills. For 2025 returns, it is $5 times the area used for business, with the area capped at 300 square feet (IRS Publication 587 (2025)). Check the 2026 edition of Publication 587 before you file a 2026 return.
With the regular method, you figure actual costs on Form 8829, which also tracks any amount carried to next year (IRS, About Form 8829). The simplified method takes no depreciation of the home, and mortgage interest and property tax stay personal items for Schedule A (IRS Publication 587 (2025)). Under the simplified method, if you used the office for only part of the year, count each month with fewer than 15 days of business use as zero (IRS Publication 587 (2025)).
| Record | Simplified method | Form 8829 (actual costs) |
|---|---|---|
| Office and home square footage | Needed; office area capped at 300 square feet (IRS Publication 587 (2025)) | Needed, to figure the business share |
| Rent, or Form 1098 mortgage interest | Not used for the office figure; interest stays on Schedule A (IRS Publication 587 (2025)) | Needed, full year |
| Utilities, insurance, HOA dues | Not used | Needed, full year, at the business share |
| Repairs | Not used | Office-only repairs in full; whole-home repairs at the share |
| Closing statement and land value | Not used: no depreciation under this method (IRS Publication 587 (2025)) | Needed for depreciation of an owned home |
| Months of use, if part of the year | Needed; months under 15 days count as zero (IRS Publication 587 (2025)) | Needed, to prorate costs |
The home bills behind Form 8829
For the regular method, collect a full year of each home cost. Renters need the lease and proof of rent paid. Owners need Form 1098 for mortgage interest, the property tax bill, and the homeowners insurance declarations page. Add electricity, gas, water, trash and any HOA dues or security system bills.
The business share of utilities is generally the same as the share of the home used for business (IRS Publication 587 (2025)). Phone service is an exception. The basic charge for the first landline into the home is a personal cost, while a second line used only for business is deductible (IRS Publication 587 (2025)).
Furniture and equipment, such as a desk or monitor, are not part of Form 8829. They are deducted as business assets, so keep their invoices in the general business folder.
Limits, carryovers and selling the home
The deduction cannot create a loss from the business. Costs such as insurance, utilities and depreciation are limited to the gross income from the business use of the home, less the other business costs (IRS Publication 587 (2025)). Amounts you cannot use carry over to the next year in which you use actual costs, not to a simplified-method year (IRS Publication 587 (2025)). So last year’s Form 8829 is on the list.
Depreciation follows you to the sale. When you sell, you cannot exclude the part of the gain equal to depreciation allowed or allowable after May 6, 1997 (IRS Publication 587 (2025)). Keep the closing statement, the improvement invoices and every Form 8829 you filed, for as long as you own the home.
Questions people ask
Can a W-2 employee deduct a home office?
Not on the federal return. Unreimbursed employee expenses are miscellaneous itemized deductions, and none are allowed for any tax year after 2017 (26 U.S.C. 67). Your state may have its own rule, and an employer may reimburse you instead.
How do I calculate my home office percentage?
Divide the square footage of the office by the square footage of the home. That share then applies to costs such as utilities, insurance and rent (IRS Publication 587 (2025)). Keep the measurements and a floor sketch with the return.
How much is the simplified home office deduction?
For 2025 returns, it is $5 times the square footage used for business, with the area capped at 300 square feet (IRS Publication 587 (2025)). You need the measurements and the months of use, but not the home bills.
Does a home office affect selling my home?
It can. You cannot exclude the part of the gain equal to depreciation allowed or allowable after May 6, 1997 (IRS Publication 587 (2025)). Keep every Form 8829 and the purchase papers until the sale year is closed.
Sources
- IRS Publication 587 (2025): Exclusive use and its exceptions, principal place of business, the yearly choice and the $5 and 300 square feet simplified method, the 15-day month rule, utilities, the first landline, the income limit, carryovers, partners and depreciation on sale.
- IRS, About Form 8829: Form 8829 figures allowable home office expenses for Schedule C and any carryover to next year.
- 26 U.S.C. 67: No miscellaneous itemized deduction is allowed for any taxable year beginning after December 31, 2017.
- IRS Publication 463 (2025): Under an accountable plan, the employee adequately accounts for expenses and returns any excess reimbursement.
About the author
Arthur Teboul (Founder, DokuTrak) is building DokuTrak after watching professionals lose hours chasing clients for documents over email. Arthur Teboul.
Editorial standards
How this page was made (methodology): it is built from the primary sources listed under Sources, and every rule and figure on it links to the source it comes from. Last updated October 25, 2026. Spotted an error or a rule that changed? Contact us.
Ask once. DokuTrak does the chasing.
- Your client uploads from one link, with no account and no password.
- Reminders go out on a schedule, by default 2, 5, 10 and 14 days after the request, until the file arrives.
- With AI review switched on in your workspace (it is off by default), each upload gets a first pass that flags a file that is not the requested document or an unreadable or blurry scan. It says so when it is not sure.
- You accept every file or mark it for re-upload, and your client gets the note by email. The AI never accepts a file.