Form 8829 for Home Office Expenses: Filing, Limits, and Carryovers

Form 8829, “Expenses for Business Use of Your Home,” is the IRS form self-employed people file with Schedule C to claim the home office deduction. It takes your rent or mortgage interest, utilities, insurance, repairs, real estate taxes, and depreciation, applies a business-use percentage, and produces a single deduction that flows to Schedule C, line 30.¹ The Form 8829 home office deduction is the actual-expense route; a simplified $5-per-square-foot alternative exists for people who would rather skip the form entirely.

Who Can File Form 8829

Form 8829 is for self-employed individuals and sole proprietors who file Schedule C. Both homeowners and renters qualify if they meet the use tests.² If you elect the simplified method for the year, you don’t file Form 8829.³

A few groups are shut out. W-2 employees cannot claim a home office deduction on their federal return. The Tax Cuts and Jobs Act suspended unreimbursed employee business expenses for 2018 through 2025, and the One Big Beautiful Bill Act, signed July 4, 2025, made that elimination permanent for miscellaneous itemized deductions subject to the 2% floor.⁴⁵ Partners who are entitled to deduct home office costs use Schedule E as unreimbursed partner expenses, not Form 8829, and only where the partnership agreement expressly requires them to pay the expense personally. S corporation owner-employees are treated as employees for this purpose; the usual path is reimbursement from the corporation under an accountable plan, which is tax-free to the shareholder and deductible by the business.⁶

Qualifying the Space: Exclusive and Regular Use

Before the numbers, the space itself has to qualify. The area must be used exclusively and regularly for business in one of these ways:⁷

As your principal place of business, including a space used for administrative or management tasks when you have no other fixed location for that work.
As a place where you regularly meet clients, patients, or customers in the normal course of business.
As a separate structure on your property used in connection with the business.
For regular storage of inventory or product samples, if your home is the sole fixed location of the business.
As a licensed daycare facility (with an exception to exclusive use, described below).

Exclusive use is literal. A spare bedroom that doubles as a guest room fails. Regular use means consistent, ongoing activity in the space, not occasional work.⁷

The Daycare Exception

Licensed daycare providers can deduct expenses for space used regularly for daycare even if the same space serves personal purposes. You must have applied for (and not been rejected), been granted and still hold, or be exempt from a license, certification, or approval under state law.⁸ The business-use percentage for the daycare portion is adjusted for the hours the home was actually used for daycare during the year.

Part I: The Business-Use Percentage

Part I sets the fraction that will be applied to every indirect household cost. The usual method divides the square footage used exclusively for business by the total square footage of the home. A 200-square-foot office in a 2,000-square-foot home is 10%. You can instead divide business rooms by total rooms, or use any other reasonable method that accurately reflects the split.⁸⁹

Part II: Direct and Indirect Expenses

Part II lists your home expenses in two columns.¹⁰

Direct expenses (column a) benefit only the business area, like painting the office. These are fully deductible.
Indirect expenses (column b) benefit the whole home. You deduct them at the business-use percentage. Rent, utilities, homeowner’s or renter’s insurance, general repairs and maintenance, mortgage interest, and real estate taxes all fall here.

The form’s specific line items are casualty losses, mortgage interest (deductible and excess), real estate taxes (deductible and excess), insurance, rent, repairs and maintenance, utilities, depreciation, and an “other expenses” line.¹⁰ Business costs that aren’t about the home itself, such as supplies, advertising, and wages, belong on Schedule C and should not appear on Form 8829.⁸

Renters use the same framework. Rent replaces mortgage interest and property taxes as the main indirect cost, alongside utilities, renter’s insurance, and maintenance.⁹

Part III: Depreciation (Homeowners Only)

Part III applies if you own the home. Start with the lesser of the home’s adjusted basis or its fair market value on the date you first used it for business, subtract the value of the land, and multiply by the business-use percentage to get the business basis of the building. That figure is then multiplied by the depreciation percentage from a table in the instructions.¹⁰

For 2025, the percentage depends on the month the home was first used for business, running from 2.461% in January to 0.107% in December. Homes placed in service after May 12, 1993, and before 2025 use a flat 2.564%.³ If you first used the home for business in 2025, or placed additions or improvements in service during 2025, you must also complete Form 4562.⁸

Depreciation has a tail. When you sell, any depreciation claimed after May 6, 1997, is reported as unrecaptured Section 1250 gain, taxed at a maximum rate of 25%. The regular home-sale exclusion of $250,000 (single) or $500,000 (married) still applies to the rest of the gain when the office was part of the same dwelling unit as your residence.

Part IV: Income Limit and Carryovers

The home office deduction cannot exceed the gross income from the business use of the home, reduced by your other business expenses. It cannot create or increase a business loss.³

Anything you can’t use this year is not lost. Part IV calculates two separate carryovers: operating expenses on line 43, and casualty losses and depreciation on line 44. The carryover stays with you even if you move to a different home.⁸ If you used the simplified method last year and are switching back to Form 8829, you can pick up carryovers from the most recent year you filed Form 8829.³

The form applies the income limit tier by tier: mortgage interest and real estate taxes come off first, then operating costs like utilities and insurance, then depreciation.⁸

The Simplified Method Alternative

If tracking actual expenses is more work than the deduction is worth, the simplified method skips Form 8829 entirely. It was introduced by Revenue Procedure 2013-13 and is available for tax years beginning on or after January 1, 2013.¹¹ You deduct $5 per square foot of business-use area, capped at 300 square feet, for a maximum of $1,500.

The tradeoffs:

No recordkeeping of actual home expenses, and no Form 8829.
Depreciation is deemed to be zero, so there’s no depreciation recapture on that year when you sell.¹²
Excess expenses cannot be carried forward.¹¹
Mortgage interest and real estate taxes stay fully on Schedule A. Under the actual-expense method, they are split between Schedule A and Form 8829.¹¹
One analysis found the actual-expense method usually produces a larger deduction when the home is worth more than about $300,000, when significant repairs occur, or when there are prior-year carryovers to use. The simplified method tends to win for homes valued at $200,000 or less.¹³

You pick a method by using it on a timely filed, original return. That choice is irrevocable for the year, but you can switch methods from year to year without IRS approval.¹⁴

2025 Changes That Affect the Form

The 2025 instructions, published in March 2026, reflect two changes worth knowing:³

The One Big Beautiful Bill Act raised the state and local tax deduction cap from $10,000 to $40,000 ($20,000 married filing separately) for tax years 2025 through 2029. The higher cap phases down for modified AGI above $500,000 ($250,000 MFS) at 30 cents per dollar of excess income, with a floor of $10,000 ($5,000 MFS). Because Form 8829 splits real estate taxes and state taxes between Schedule A and the business schedule, the change affects the allocation.³
Updated depreciation percentages apply to homes first placed in business use during 2025, ranging from 2.461% in January to 0.107% in December.⁸

Where the Deduction Ends Up

The allowable deduction from line 36 goes to Schedule C, line 30. If you used more than one home for business during the year, file a separate Form 8829 for each.¹⁰ The current form and instructions live at IRS.gov/Form8829.¹

1
IRS. About Form 8829, Expenses for Business Use of Your Home
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IRS. How Small Business Owners Can Deduct Their Home Office From Their Taxes
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IRS. Instructions for Form 8829
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IRS. IRS Tax Tip on Home Office Deduction
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Thomson Reuters. What OBBB Means for Your Clients’ Itemized Deductions
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Journal of Accountancy. Deduct Home Office Expenses
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IRS. Publication 587, Business Use of Your Home
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IRS. Instructions for Form 8829 (PDF)
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TurboTax. What Is IRS Form 8829
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IRS. Form 8829 (PDF)
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IRS. Simplified Option for Home Office Deduction
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IRS. FAQs Simplified Method for Home Office Deduction
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The Tax Adviser. Home Office Safe Harbor
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The Tax Adviser. Simplified Home Office Deduction