Form 8829: the home office form

The home office deduction can be worth far more under the regular method than the simplified one, but the regular method means Form 8829. This guide walks through how the form works and when it is worth the effort.

By Mirza Fahad Baig, Chartered Accountant. Reviewed by Muhammad Bilal, Chartered Accountant. Checked against official sources on . 2 minute read.

Short answer

Form 8829 calculates the home office deduction for Schedule C filers using the regular method. Work out the business percentage of your home, apply it to indirect expenses such as rent, utilities and insurance, add direct expenses for the office itself, and include depreciation if you own the home. The simplified method, $5 per square foot up to 300 square feet, does not use it.

At a glance

Who uses it
Schedule C filers using the regular method
Business percentage
Office area divided by home area
Indirect expenses
Rent, utilities, insurance, mortgage interest, taxes
Direct expenses
Costs only for the office, deducted in full
Income limit
Cannot create a loss; excess carries forward
Simplified method
$5 per square foot, up to 300 square feet, no Form 8829
Form 8829: the home office formSteps: 1. Part I: business percentage; 2. Part II: allowable deduction; 3. Apply the income limit; 4. Part III: depreciation; 5. Part IV: carryovers.THE PROCESS AT A GLANCEForm 8829: the home office form1Part I: businesspercentageThe office's squarefootage divided by thehome's total2Part II:allowabledeductionDirect expenses infull, plus the businesspercentage of indirectexpenses3Apply the incomelimitThe deduction cannotexceed the business'snet income from thehome4Part III:depreciationFor homeowners,depreciation of thebusiness part of thebuilding5Part IV:carryoversAmounts disallowed bythe income limit carryto next yearChecked against official sourcesTax BakersForm 8829: the home office formSteps: 1. Part I: business percentage; 2. Part II: allowable deduction; 3. Apply the income limit; 4. Part III: depreciation; 5. Part IV: carryovers.THE PROCESS AT A GLANCEForm 8829: the home office form1Part I: business percentageThe office's square footage divided by thehome's total2Part II: allowable deductionDirect expenses in full, plus the businesspercentage of indirect expenses3Apply the income limitThe deduction cannot exceed the business'snet income from the home4Part III: depreciationFor homeowners, depreciation of the businesspart of the building5Part IV: carryoversAmounts disallowed by the income limit carryto next yearChecked against official sourcesTax Bakers
The process at a glance: 1. Part I: business percentage; 2. Part II: allowable deduction; 3. Apply the income limit; 4. Part III: depreciation; 5. Part IV: carryovers.

Who can use it?

Self-employed people filing Schedule C whose home office is used regularly and exclusively for business, and is either the principal place of business or a place to meet clients. Partners and S corporation owners do not use Form 8829: partners use a separate worksheet, and employees of their own corporation are reimbursed under an accountable plan. See the home office deduction.

How does the form work?

  1. Part I: business percentage

    The office's square footage divided by the home's total.

  2. Part II: allowable deduction

    Direct expenses in full, plus the business percentage of indirect expenses.

  3. Apply the income limit

    The deduction cannot exceed the business's net income from the home.

  4. Part III: depreciation

    For homeowners, depreciation of the business part of the building.

  5. Part IV: carryovers

    Amounts disallowed by the income limit carry to next year.

Which expenses count?

TypeExamplesDeducted
DirectPainting or repairs to the office onlyIn full
IndirectRent, mortgage interest, property tax, insurance, utilities, general repairsBusiness percentage
UnrelatedLawn care, repairs to other roomsNot deductible

What does an example look like?

A 200 square foot office in a 1,600 square foot rented flat is 12.5% of the home. With yearly rent of $24,000 and utilities and insurance of $3,600, the deduction is 12.5% of $27,600, or $3,450, provided the business earned at least that much. The simplified method would give 200 × $5, or $1,000.

What happens when you sell the home?

Depreciation claimed, or that could have been claimed, after May 6, 1997, is taxed when the home is sold, even if the rest of the gain is excluded. Weigh that against the yearly saving if you own the home.

Want your home office claimed correctly?

We compare the regular and simplified methods for you, complete Form 8829 where it saves more, and keep the records that support it.

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Questions people ask

What is Form 8829?

The form Schedule C filers use to calculate the home office deduction under the regular method.

Do I need Form 8829 for the simplified method?

No. The simplified method, $5 per square foot up to 300 square feet, is claimed directly on Schedule C.

Can the home office deduction create a loss?

No. It is limited to the business's net income; the excess carries forward.

Do S corporation owners use Form 8829?

No. They are usually reimbursed by the corporation under an accountable plan.

Sources

Every fee, date and rule on this page was taken from these official and primary sources.

  1. IRS: About Form 8829
  2. IRS Publication 587: Business Use of Your Home
  3. IRS: Simplified option for home office deduction

Rules and fees change. If you are reading this long after October 1, 2026, confirm the figures with the source before you rely on them.

Business tax by entity typeHome office deduction: who qualifies and how to calculate itFederal tax formsSchedule C (Form 1040): reporting business incomeBusiness tax by entity typeBusiness expenses you can deduct: a working list

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This guide is general information. It is not tax or legal advice for your situation.