Form 8829 is used to calculate the allowable expenses for business use of your home, which are reported on Schedule C (Form 1040) by self-employed individuals. This form determines the deductible portion of home-related expenses (such as mortgage interest, real estate taxes, utilities, insurance, and repairs) based on the percentage of your home used for business. If your deductible expenses exceed the allowable limit, Part IV of Form 8829 is used to calculate the carryover to the next tax year. A separate Form 8829 must generally be used for each home used for business during the year.
Who Can Use Form 8829
- Self-employed individuals (sole proprietors) who use part of their home for business.
- Those who meet IRS requirements for home office deductions, including exclusive and regular use.
Who Cannot Use Form 8829
- Employees claiming home office expenses (these are not deductible for most employees under current law).
- Individuals who elect the simplified method for home office expenses (Form 8829 is not used in that case).
- Partners and farmers generally do not use Form 8829; instead, they use worksheets in Publication 587 to compute allowable expenses.
- Expenses allocable to inventory are not deducted on Form 8829 but are included in cost of goods sold (Schedule C, Part III).
Eligibility Requirements for Business Use
To deduct expenses, the space used for business must meet one of the following criteria:
- Principal place of business: Used exclusively and regularly for administrative or management activities, and no other fixed location exists for such activities.
- Place of meeting clients: Used regularly to meet patients, clients, or customers in the normal course of business.
- Separate structure: A detached structure not attached to the home used in connection with the business.
- Storage of inventory or product samples: Used regularly to store inventory or product samples, and the home is the only fixed location of the business.
Expenses That Can Be Deducted
Only direct or indirect expenses allocable to business use of the home may be entered on Form 8829. Examples include:
- Mortgage interest
- Property taxes
- Utilities
- Repairs and maintenance
- Insurance
Expenses not allocable to business use (e.g., salaries, supplies, advertising) should be reported on Schedule C, not Form 8829.
Special Considerations
- Tax-exempt income: Expenses allocable to tax-exempt income (e.g., parsonage or military housing allowances) are generally not deductible, except for mortgage interest and real property taxes.
- Part-year use: If you did not operate a business for the entire year, only expenses incurred during the business-use period are deductible.
- Carryover: If allowable expenses exceed the deduction limit, the excess may be carried over to the next tax year (2026 for 2025 returns).
Source:
Form 8829 Instructions (2025)
Disclaimer: Always verify details with current IRS forms, instructions, and publications. For complex situations, consult a CPA or tax attorney.