Can I deduct a home office if I am an employee working from home?

No. Under the Tax Cuts and Jobs Act, the deduction for employee business expenses — including the home office — was suspended as a miscellaneous itemized deduction through at least 2025. W-2 employees cannot claim a home office deduction on their federal return during this period, regardless of how much time they spend working from home. Self-employed individuals filing Schedule C are not affected by this suspension.

What happens to my home office deduction when I sell my house?

Depreciation claimed on the business portion of your home through Form 8829 reduces your home's adjusted basis and is subject to recapture as unrecaptured Section 1250 gain when you sell, taxed at a maximum rate of 25%. The home office space may also be ineligible for the full Section 121 principal residence exclusion to the extent it has been treated as business property. Accurate records of depreciation taken each year are essential for calculating gain correctly at sale.

Does Form 8829 create a loss, or is the deduction limited to my business income?

Form 8829 cannot generate or increase a net loss from your Schedule C business. The allowable deduction is limited to the gross income from the business reduced by all other business deductions that are not home office expenses. Any excess deduction — including the depreciation component — is carried forward to the following tax year on Part IV of Form 8829 and may be deducted when sufficient business income exists.

How do I calculate the business-use percentage if my office is an irregular shape?

Measure the actual usable floor area of the business space as accurately as possible, using a tape measure or floor plan if available. For irregular rooms, break the space into rectangles, calculate each section separately, and sum them. The IRS also permits an alternative calculation based on the number of rooms if all rooms in the home are approximately the same size, but the square footage method is more defensible and more commonly used by tax professionals.

Can I claim a home office deduction if I rent rather than own my home?

Yes. Renters can claim the home office deduction using Form 8829, and in many respects the calculation is simpler because there is no depreciation component — rent is an indirect expense that is allocated by the business-use percentage. Other indirect expenses such as renter's insurance and utilities are handled the same way as for homeowners. The income limitation and exclusive-use requirements apply equally to renters.

What records should I keep to support a Form 8829 deduction in case of an IRS audit?

Retain documentation of the home's square footage (floor plans, appraisal, or property tax records), photographs of the dedicated business space, all receipts and statements for home expenses claimed (Form 1098, utility bills, insurance declarations, repair invoices), and copies of every prior-year Form 8829 to support carryforward amounts. A brief written description of how the space is used exclusively and regularly for business — such as a client log or calendar — can be valuable if the exclusive-use requirement is questioned.

Deductions & Credits

Form 8829: Expenses for Business Use of Your Home

Used to calculate and claim the deduction for using part of your home regularly and exclusively for business purposes.

Download Form 8829 PDF About on IRS.gov Instructions PDF

Overview

IRS Form 8829, Expenses for Business Use of Your Home, is the mechanism by which self-employed individuals calculate and claim a deduction for the portion of their home used regularly and exclusively for business. The form flows directly to Schedule C (Profit or Loss From Business) and ultimately to Form 1040, so it does not stand alone — it is one piece of a larger self-employment filing picture. The authority for the home office deduction sits primarily in IRC Section 280A, which both grants the deduction and imposes its strict limitations.

The form works by establishing a business-use percentage — the ratio of the area dedicated to business compared to the total area of the home — and then applying that percentage to indirect expenses such as mortgage interest, utilities, insurance, and depreciation. Direct expenses, meaning costs that benefit only the business space itself (for example, repainting just the home office), are deductible in full. The resulting deduction is subject to an income limitation: you cannot use Form 8829 to generate or increase a net loss from the business activity. Any disallowed amount carries forward to the following year.

For tax years beginning in 2013 and later, the IRS also offers a simplified method for the home office deduction, which allows a flat dollar amount per square foot of qualifying space up to a capped square footage, eliminating the need to track actual expenses. Taxpayers who use the simplified method do not file Form 8829; instead, they enter the deduction directly on Schedule C. Form 8829 is required only when using the regular (actual expense) method. Most CPA firms advise clients with significant home costs — particularly mortgage interest or high utility bills — to run both calculations before choosing a method, since the regular method frequently yields a larger deduction.

Who Files This Form?

Form 8829 must be filed by self-employed individuals who use a part of their home for business and who elect to calculate that deduction using the actual expense method rather than the IRS simplified method. The taxpayer must satisfy two threshold tests under IRC Section 280A: the space must be used regularly and exclusively for business, and it must qualify under at least one of several use categories.

The most common qualifying category is principal place of business, meaning the taxpayer uses the space to conduct administrative or management activities of the trade and has no other fixed location where those activities occur. A second category covers spaces used to meet clients, customers, or patients in the normal course of business — even if the taxpayer also works elsewhere. A third category covers a separate freestanding structure on the property, such as a studio or workshop, used in connection with the business.

The exclusive-use requirement is strict. A room used partly as a guest bedroom or for personal computing does not qualify, even if it also serves a business function. There is a narrow exception for daycare facilities and for inventory or product storage, where exclusive use is not required.

Employees cannot use Form 8829 at all. Under the Tax Cuts and Jobs Act, the employee home office deduction was suspended through 2025 (the suspension runs through at least the end of that provision), so W-2 workers may not claim unreimbursed home office expenses as a miscellaneous itemized deduction during this period.

Partners in a partnership who use a home office can potentially deduct expenses, but the mechanics differ — they typically deduct on Schedule E rather than via Form 8829. S corporation shareholders who are also employees face similar limitations. Form 8829 is specifically designed for sole proprietors filing Schedule C.

Key Fields

Part I – Area used regularly and exclusively for business (Square footage of qualifying space)

Enter the square footage of the area that meets the regular and exclusive use tests. This is the numerator in your business-use percentage. Measure carefully — overstating this figure is one of the most audited items on the form. For irregular spaces, a reasonable estimate based on floor plan measurements is acceptable.

Part I – Total area of home

Enter the total square footage of the entire home, including all rooms regardless of use. The IRS generally accepts the square footage from your mortgage appraisal, property tax records, or actual measurement. This becomes the denominator in your business-use percentage calculation.

Part I – Business percentage

Calculated by dividing the business-use area by the total home area and expressing the result as a percentage. This percentage is applied to all indirect expenses in Part II. A percentage that seems unusually high relative to the home's total size may attract scrutiny.

Part II – Direct expenses (Column a)

Enter expenses that benefit only the business portion of the home — for example, repainting the office, repairing a window exclusively in that room, or purchasing shelving installed only in the business space. Direct expenses are deductible at 100%, not reduced by the business percentage.

Part II – Indirect expenses (Column b)

Enter expenses that benefit the entire home and must be allocated by the business percentage. Common indirect expenses include homeowner's insurance, utilities, general repairs and maintenance, rent (for renters), mortgage interest, and real estate taxes. Only the business-percentage share is deductible via Form 8829; the remaining share of mortgage interest and real estate taxes is still potentially deductible on Schedule A.

Part II – Depreciation of home

One of the most valuable and most frequently missed components. The portion of the home's adjusted basis allocated to the office is depreciated over 39 years (nonresidential real property method). You need the home's original purchase price, the land value (which is not depreciable), and the date you began using the space for business. Depreciation reduces your basis and must be recaptured when the home is sold, so accurate recordkeeping matters beyond the current filing year.

Part II – Casualty losses

Enter any casualty or theft losses attributable to the business portion of the home. These flow from Form 4684 and must satisfy the general casualty loss rules. This line is relatively uncommon but is important for taxpayers in federally declared disaster areas.

Part III – Excess casualty losses and depreciation carryover

Because the home office deduction is limited to the gross income from the business (less other business expenses), excess depreciation and casualty losses that cannot be deducted in the current year are tracked here and carried forward to the next year. This carryforward is a key planning item — confirm it is picked up on next year's Form 8829.

Part IV – Carryover of unallowed expenses

Tracks all categories of disallowed expenses (not just depreciation) that carry forward due to the income limitation. This section must reconcile with the prior year's Form 8829. Missing a prior-year carryforward is one of the most common and costly errors on this form.

Filing Deadlines

Due Date

April 15

With Extension

October 15

Late Filing Penalty

Filed with Schedule C and Form 1040; subject to the same failure-to-file and failure-to-pay penalties.

Step-by-Step Instructions

1
Confirm the taxpayer meets the regular and exclusive use test and qualifies under at least one of the IRC Section 280A use categories before starting the form. If the space does not qualify, stop — filing Form 8829 for a non-qualifying space creates audit exposure.
2
Measure or verify the square footage of the business-use area and the total home. Pull supporting documentation — floor plans, appraisal reports, or property tax records — and retain them in the client file. Calculate the business-use percentage to at least two decimal places.
3
Gather all home-related expense records for the year: mortgage interest statement (Form 1098), homeowner's insurance declarations, utility bills, real estate tax bills, and receipts for any home repairs or improvements. Separate expenses into direct (office-only) and indirect (whole-home) categories.
4
Determine the home's adjusted basis excluding land value and identify the date the office use began. Calculate current-year depreciation for the business portion using the straight-line method over 39 years. If Form 4562 is required for other assets on the return, coordinate the depreciation calculation there.
5
Pull the prior-year Form 8829 to identify any carryforward of unallowed expenses from Part IV. These amounts must be entered in the current year's calculation and will increase the deductible amount if income permits.
6
Complete Part I to establish the business percentage, then complete Part II by entering direct expenses in Column a and indirect expenses in Column b. Multiply indirect expenses by the business percentage as instructed. Do not apply the business percentage to direct expenses.
7
Apply the income limitation test in Part II. The total home office deduction cannot exceed the gross income from the business reduced by all other business deductions (excluding the home office deduction itself). If the calculated deduction exceeds this limit, the excess is carried forward — record it in Parts III and IV.
8
Transfer the allowable home office deduction to the appropriate line on Schedule C. Verify that mortgage interest and real estate taxes excluded from Form 8829 (the personal-use portion) are picked up on Schedule A if the taxpayer itemizes.
9
Review the completed Form 8829 against prior-year returns for reasonableness — unexplained large swings in the business percentage or deduction amount relative to prior years can be a red flag in both review and audit contexts.

Common Mistakes to Avoid

Failing to carry forward prior-year unallowed expenses from Part IV of the previous Form 8829.

Build a checklist item into your intake process to pull the prior-year return and verify whether a carryforward exists. Software should auto-populate this, but manual review catches import errors.

Omitting depreciation on the business portion of the home entirely, often because the taxpayer is unaware it is required.

Depreciation is mandatory under the regular method, not optional — the IRS will treat it as having been taken even if it was not claimed. Calculate and claim it each year and flag the future recapture obligation for the client.

Applying the business percentage to direct expenses instead of deducting them at 100%.

Confirm which expenses were incurred solely for the business space before entering them. Only indirect (whole-home) costs are multiplied by the business percentage; direct costs go in Column a and are fully deductible.

Claiming a home office for a space that also serves personal use, most commonly a dining room, spare bedroom, or shared workspace.

Document that the space is used exclusively for business. If there is any personal use — even occasional — the deduction is disallowed in its entirety for that space under IRC Section 280A. Advise clients to designate and physically maintain a separate, dedicated area.

Double-deducting mortgage interest and real estate taxes by claiming the full amounts on both Schedule A and Form 8829.

Only the business-percentage share goes on Form 8829. The personal-use remainder is deductible (subject to normal limitations) on Schedule A. Coordinate the two schedules to ensure the split is correct and totals match the Form 1098.

Using the wrong depreciation method or recovery period — for example, applying a 27.5-year residential real property period instead of 39 years.

The home office is classified as nonresidential real property for depreciation purposes and must be depreciated over 39 years using the straight-line method. Apply this regardless of how the rest of the home is classified for other purposes.

Frequently Asked Questions

The regular method, calculated on Form 8829, uses your actual home expenses multiplied by a business-use percentage and typically produces a larger deduction for taxpayers with significant home costs. The simplified method allows a flat dollar rate per square foot of qualifying space up to a capped maximum square footage, requires no Form 8829, and involves no depreciation — which also means no depreciation recapture when the home is sold. You may switch between methods from year to year, though unused carryforwards from regular-method years cannot be used in simplified-method years.

Related Forms

Schedule C

Profit or Loss from Business (Sole Proprietorship)

Form 4562

Depreciation and Amortization (Including Information on Listed Property)

Form 1040

U.S. Individual Income Tax Return

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