IRS Form 8829 — Expenses for Business Use of Your Home

What is Form 8829?

Form 8829 (Expenses for Business Use of Your Home) is used by self-employed individuals (Schedule C filers) to calculate the home office deduction. The form determines the allowable deduction based on the percentage of the home used exclusively and regularly for business, then applies that percentage to actual home expenses. This is distinct from the simplified method (which uses a flat $5 per square foot rate) — Form 8829 uses actual expenses and often produces a larger deduction.

Qualifying for the Home Office Deduction

To use Form 8829, the home office must meet the exclusive and regular use test under IRC §280A:

• Exclusive use: The space must be used only for business — not as a guest room, exercise room, or any personal use. Even occasional personal use disqualifies the space.
• Regular use: The space must be used on a regular basis for business, not just occasionally.
• Principal place of business: The home office must be the taxpayer's principal place of business, OR a place where the taxpayer meets clients/customers, OR a separate structure used for business.

Calculating the Business Use Percentage

The business use percentage is calculated as: Square footage of home office ÷ Total square footage of home

Example: A 200 sq ft home office in a 2,000 sq ft home = 10% business use percentage. All home expenses are then multiplied by 10% to determine the deductible amount.

Form 8829 — Deductible Expenses

Depreciation on Home Office

The depreciation deduction on Form 8829 is calculated using the home's adjusted basis (purchase price minus land value) multiplied by the business use percentage, divided by 39 years. This deduction reduces the home's basis and creates §1250 unrecaptured depreciation taxed at 25% when the home is sold — even if the home qualifies for the §121 exclusion ($250,000/$500,000 gain exclusion).

Example: A home with $400,000 depreciable basis and 10% business use generates $1,026 in annual depreciation ($400,000 × 10% ÷ 39 years). After 10 years, $10,256 of accumulated depreciation is subject to 25% tax on sale = $2,564 in additional tax. This is a real cost that must be weighed against the annual deduction benefit.

Simplified Method vs. Form 8829

Income Limitation and Carryover

The home office deduction cannot exceed the gross income from the business (after other business deductions). Any excess is carried forward to future years on Form 8829. This prevents the home office deduction from creating or increasing a Schedule C loss — but the carryover can be used in future profitable years.

S-Corp Accountable Plan Alternative

S-Corp shareholders cannot use Form 8829 — the home office deduction is not available to employees (including shareholder-employees). Instead, S-Corp owners should use an accountable plan to reimburse the home office expense. The S-Corp deducts the reimbursement as a business expense, and the shareholder-employee receives the reimbursement tax-free. This achieves the same economic result as the Schedule C home office deduction but through a different mechanism.

Form 8829 — Expenses for Business Use of Your Home

Form 8829 is used by self-employed individuals (sole proprietors and single-member LLC owners) to calculate the home office deduction under §280A. The form calculates the deductible portion of home expenses based on the percentage of the home used exclusively and regularly for business. The home office deduction is one of the most valuable and most misunderstood deductions available to self-employed individuals.

Who Uses Form 8829

Form 8829 is used by:

• Sole proprietors (Schedule C filers) with a qualifying home office
• Single-member LLC owners taxed as sole proprietors

Not used by:

• S-Corp shareholder-employees (they use an accountable plan reimbursement instead)
• Partnership members (the partnership claims the deduction, not the individual)
• Employees (home office deduction for employees was eliminated by TCJA for 2018-2025)

Qualifying for the Home Office Deduction

To qualify, the home office must be used:

1. Exclusively: The space must be used only for business — not for personal activities. A dedicated room qualifies; a kitchen table used for both meals and work does not.
2. Regularly: The space must be used on a regular basis for business — not just occasionally.
3. As the principal place of business: The home office must be either (a) the taxpayer's principal place of business, (b) a place where clients/customers are met in the normal course of business, or (c) a separate structure not attached to the home used in connection with the business.

Calculating the Business-Use Percentage

The business-use percentage is calculated as:

Area of home office ÷ Total area of home = Business-use percentage

Example: A 200 sq ft home office in a 2,000 sq ft home = 10% business use. All home expenses are then multiplied by 10% to determine the deductible amount.

Alternatively, if all rooms in the home are approximately the same size, the number of rooms method can be used: number of rooms used for business ÷ total rooms in home.

Form 8829 — Key Lines

Depreciation — The Most Valuable Line on Form 8829

The depreciation deduction (Line 29) is often the largest single deduction on Form 8829 and is frequently overlooked. The calculation:

1. Determine the home's basis (purchase price + improvements - land value)
2. Multiply by the business-use percentage
3. Divide by 39 years (residential rental property depreciation period)

Example: A home purchased for $400,000 (land value $80,000, building $320,000) with a 10% home office generates $820 in annual depreciation ($320,000 × 10% ÷ 39 = $820).

Depreciation recapture warning: When the home is sold, the depreciation taken on the home office portion is subject to §1250 recapture at 25% — even if the home qualifies for the §121 primary residence exclusion. Practitioners must track cumulative home office depreciation for clients who may sell their home.

The Simplified Method

Instead of Form 8829, taxpayers can use the simplified method: $5 per square foot of home office space, up to 300 square feet (maximum $1,500 deduction). The simplified method requires no depreciation calculation and no recapture on sale. However, it produces a smaller deduction for most taxpayers — the regular method is almost always better for homeowners with significant home expenses.

Gross Income Limitation

The home office deduction cannot exceed the gross income from the business. If the business has a net loss, the home office deduction is limited to zero — but the excess is carried forward to future years when the business has income. This carryforward is tracked on Form 8829, Part IV.

Form 8829: Expenses for Business Use of Your Home — Complete Practitioner Guide

Form 8829 (Expenses for Business Use of Your Home) is used by sole proprietors to calculate the home office deduction under IRC §280A. It is one of the most frequently misunderstood forms in individual tax preparation, and one of the most commonly audited deductions. This guide provides the complete framework for correctly calculating, documenting, and defending the home office deduction.

Eligibility Requirements: The Two Tests

To qualify for the home office deduction, the business use of the home must meet two tests under IRC §280A(c):

Test 1 — Regular and Exclusive Use: The portion of the home used for business must be used regularly and exclusively for business. "Regular" means on a recurring basis — occasional or incidental use does not qualify. "Exclusive" means the space is used only for business — a dining room table used for both family meals and business work does not qualify. The exclusive use requirement is strictly interpreted by the IRS and courts.

Test 2 — Principal Place of Business: The home office must be either (a) the taxpayer's principal place of business, (b) a place where the taxpayer meets or deals with patients, clients, or customers in the normal course of business, or (c) a separate structure not attached to the home used in connection with the business. The "principal place of business" test is met if the home office is used for administrative or management activities of the business and there is no other fixed location where the taxpayer conducts substantial administrative or management activities (Soliman v. Commissioner, 506 U.S. 168 (1993)).

Calculating the Business Use Percentage

The business use percentage is calculated by dividing the square footage of the home office by the total square footage of the home. For example, a 200 square foot dedicated office in a 2,000 square foot home produces a 10% business use percentage. This percentage is applied to indirect expenses (mortgage interest, real estate taxes, insurance, utilities, repairs to the entire home, depreciation) to determine the deductible amount.

Direct expenses (expenses that benefit only the home office, such as painting the office or repairing the office floor) are 100% deductible. Indirect expenses are deductible only to the extent of the business use percentage.

Simplified Method vs. Actual Expense Method

Taxpayers can choose between two methods for calculating the home office deduction:

Simplified Method: $5 per square foot of the home office, up to a maximum of 300 square feet ($1,500 maximum deduction). No depreciation is claimed, so there is no depreciation recapture when the home is sold. The deduction cannot exceed the gross income from the business.

Actual Expense Method (Form 8829): Deduct the actual expenses allocable to the home office based on the business use percentage. This method typically produces a larger deduction for homeowners with significant mortgage interest, property taxes, and depreciation. However, it requires more documentation and creates a depreciation recapture issue when the home is sold.

The choice between methods can be made annually — taxpayers can use the simplified method in one year and the actual expense method in another. However, switching from the actual expense method to the simplified method requires recapturing any unallowed expenses that were carried forward from prior years.

Depreciation and Recapture

Under the actual expense method, the home office is depreciated over 39 years (nonresidential real property) using the straight-line method. The depreciable basis is the lesser of the home's adjusted basis or its fair market value at the time the home office use began, multiplied by the business use percentage.

When the home is sold, any depreciation claimed (or allowable) on the home office portion is subject to §1250 unrecaptured depreciation, taxed at a maximum rate of 25%. This recapture applies even if the taxpayer qualifies for the §121 home sale exclusion ($250,000/$500,000) — the exclusion does not apply to the portion of gain attributable to depreciation. Practitioners must track home office depreciation carefully and advise clients of the recapture consequences before they sell.

S-Corp Home Office: The Accountable Plan Alternative

S-Corp shareholders cannot use Form 8829 because the home office deduction under §280A is only available to sole proprietors (Schedule C filers). However, S-Corp shareholders can achieve a similar result through an accountable plan: the S-Corp reimburses the shareholder for home office expenses under an accountable plan, the reimbursement is deductible by the S-Corp, and the shareholder excludes the reimbursement from income. This approach avoids the 2% AGI floor (which no longer applies after TCJA but was historically a limitation) and the depreciation recapture issue.