Home Office Expenses — United States Tax Rules

Claim your home office using IRS Simplified Method ($5/sq ft, max $1,500/year) or Form 8829 actual expenses — exclusive and regular use required.

Claimable: Conditionally claimable · Tax authority: IRS (Internal Revenue Service)

IRS (Internal Revenue Service) Rules

• The space must be used regularly and exclusively for business — a spare bedroom used only for work qualifies; a kitchen table does not.
• Two methods available: (1) Simplified Method — $5/sq ft up to 300 sq ft = maximum $1,500/year deduction. No depreciation recapture on sale.
• (2) Regular Method (Form 8829) — calculate business-use percentage (workspace sq ft ÷ total home sq ft), then multiply actual home expenses: rent/mortgage interest, utilities, insurance, repairs, depreciation.
• The home office deduction cannot exceed your net business income for the year — it cannot create a loss. Unused amounts are not carried forward under the simplified method.
• If you also work at an outside location, the home office must be your principal place of business, OR used exclusively to meet clients.
• Home office used only for meeting clients (no other work done there) can qualify even if you work primarily elsewhere.
• Self-employed health insurance deduction is on Schedule 1 Line 17 — not Schedule C. Do not include it in home office calculations.

Limits

Simplified Method: max $1,500/year (300 sq ft × $5). Regular Method: deduction limited to net Schedule C income — no carryforward allowed.

Worked Example

Marcus works from a dedicated 200 sq ft home office in a 1,000 sq ft apartment. Using the Simplified Method: 200 sq ft × $5 = $1,000 deduction — straightforward with no Form 8829. If he uses the Regular Method: 200/1,000 = 20% of home expenses. Annual costs: rent $18,000, utilities $2,400, internet $720. Home office deduction: ($18,000 + $2,400 + $720) × 20% = $4,224 — substantially more than the simplified method. He chooses whichever gives the larger deduction this year.

Record Keeping

• Measure your workspace and total home floor area — document the calculation annually
• Keep all rent receipts, mortgage statements (interest component), utility bills, and home insurance invoices
• If using the Regular Method, retain Form 8829 and the underlying receipts for 3 years after filing
• Photograph the workspace annually to demonstrate exclusive use
• Keep a lease or mortgage statement showing your principal residence address

Frequently Asked Questions

Can I switch between Simplified and Regular Method each year?

Yes — you can choose either method each tax year, whichever gives you the better deduction. However, if you switch from the Regular Method back to Simplified, you lose the ability to deduct any unused carryover from the Regular Method.

What if I use part of a room for business?

The exclusive use requirement is strict — if you work at a desk in your living room that is also used personally, you cannot claim that desk area as a home office deduction. The area must be used exclusively and regularly for business. A room used solely as a home office qualifies; a shared space generally does not.

Does the home office deduction trigger an audit?

The home office deduction used to be a major audit trigger, but this is less true today as remote work has become mainstream. The key is meeting the exclusive-use test and documenting your home office properly. Keep photographs and floor plan measurements.

Can renters claim the home office deduction?

Yes — renters can deduct the proportional share of rent under the Regular Method or use the Simplified Method at $5/sq ft. The rules are identical whether you rent or own.