Home Office Deduction: Simplified vs. Regular Method
By the FiscalData.US editorial team · Updated October 2026 · 9 min read · Sources & methodology
If you run a business from home, part of your rent, mortgage interest, utilities and insurance may be deductible. The home office deduction lowers both income tax and self-employment tax, so it is worth more than many deductions. It is also one of the most misapplied. This guide explains who qualifies, how the two calculation methods compare and what records to keep.
1. Who Can Claim It
The deduction is available to self-employed people, independent contractors and partners. Since 2018, W-2 employees cannot claim it on their federal return, even if they work from home full time; a few states, such as California and New York, still allow unreimbursed employee expenses on the state return.
2. The Two Tests
- Regular and exclusive use: a specific, identifiable area used only for business. A desk in the corner of a bedroom can qualify; a dining table used for family meals cannot. Exceptions exist for daycare and inventory storage.
- Principal place of business: the space is where you do most of your work, or where you handle administrative tasks and have no other fixed location, or where you meet clients.
A separate detached structure, such as a studio or garage workshop, only needs the exclusive use test.
3. Simplified Method vs. Regular Method
| Simplified | Regular (actual expenses) | |
|---|---|---|
| Calculation | $5 × business square feet | Business % × actual home costs |
| Maximum area | 300 sq ft ($1,500 cap) | No cap |
| Depreciation | None | Yes, with recapture on sale |
| Mortgage interest & property tax | Deducted in full on Schedule A if itemizing | Business share on Form 8829 |
| Carryover of unused amount | No | Yes |
| Paperwork | Minimal | Form 8829 and detailed records |
4. What the Regular Method Covers
Your business percentage is the office area divided by the total home area. You then apply it to:
- Rent, or mortgage interest and property taxes
- Homeowners or renters insurance
- Utilities: electricity, gas, water, trash
- Repairs and maintenance for the whole home (direct office repairs are 100%)
- Depreciation of the building portion (39-year schedule for homeowners)
- Internet and phone are separate business expenses based on business use, not square footage
5. Worked Example
Dana, a freelance designer, rents a 1,200 sq ft apartment and uses a 180 sq ft room exclusively as her studio (15%). Annual costs: rent $24,000, utilities $2,400, renters insurance $300.
- Simplified: 180 × $5 = $900.
- Regular: 15% × $26,700 = $4,005.
- At a combined 22% income tax and about 14.1% effective SE tax, the regular method saves roughly $1,450 versus $325.
Plug the deduction into the self-employed tax calculator to see the effect on your quarterly payments.
6. Income Limit and Depreciation Recapture
The deduction cannot create a business loss. Under the regular method, excess amounts carry forward to future years. Homeowners should know that depreciation claimed (or allowable) on the office is taxed at up to 25% when the home is sold, and that portion is not covered by the home-sale exclusion. Renters face no such issue, which often makes the regular method an easy choice for them.
7. Records to Keep
Keep a floor plan with measurements, photos of the space, utility bills, lease or mortgage statements and receipts for repairs. The IRS rules are in Publication 587.
Frequently Asked Questions
Can I switch methods each year?
Yes, you can choose either method each year.
Does a home office raise audit risk?
Not by itself; the risk lies in claims without exclusive use or records.
I have a W-2 job and a side business. Can I claim it?
Yes, for the side business, provided the space is used exclusively for it.
Sources & legal references
Figures in this guide were checked by the FiscalData.US editorial team against these primary sources and, where relevant, state revenue department notices. See our methodology & update policy.
- IRS Publication 587 — Business Use of Your Home
- 26 U.S.C. §280A — Home office rules
- IRS Rev. Proc. 2025-32 — 2026 inflation adjustments (brackets, standard deduction, credits)
- IRS Rev. Proc. 2024-40 — 2025 inflation adjustments (prior-year comparison)
- Public Law 119-21 (One Big Beautiful Bill Act, July 2025)
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FiscalData.us provides estimates for informational purposes only and is not financial or tax advice. The information in this guide is general in nature, does not consider your personal circumstances and does not create a client relationship. FiscalData.US is not responsible for decisions made based on this content.