Home Office Deduction 2026: Simplified vs Actual Method (Form 8829)

The home office deduction was a flashpoint pre-2014 — calculations were tedious and audit risk felt high. The simplified method changed that. Here's how to actually decide between methods and execute either one correctly.

Who qualifies

Per IRC § 280A and Pub 587, all three must be true:

1. Regular use — the space is used for business consistently (not occasionally)
2. Exclusive use — that space is used only for business (no Netflix from the desk after hours)
3. Principal place of business — your main spot for administrative work, OR a separate structure used exclusively for business

W-2 employees lost this deduction in 2018 (TCJA). Self-employed, sole props, partners, and SMLLC owners still qualify.

Simplified method

Per Rev. Proc. 2013-13:

• $5 per sq ft of home office space
• Maximum 300 sq ft = $1,500 max deduction
• No depreciation, no recapture on sale
• Reported directly on Schedule C line 30
• No Form 8829 required

Best for: small offices, simple situations, low rent areas, you'd rather not deal with depreciation.

Actual method (Form 8829)

Per Form 8829:

1. Calculate business-use percentage = (home office sq ft / total home sq ft)
2. Apply that % to:
   • Rent OR mortgage interest
   • Property taxes
   • Utilities (electric, gas, water, internet, trash)
   • Homeowners insurance
   • Repairs to the office (100% deductible) or to the whole home (apportioned)
   • Depreciation on home value (39-year straight-line for the business portion)

Best for: high-rent metros (SF, NYC, LA, Boston, Seattle), large home offices, owners.

Concrete example: Home office in San Francisco

Setup:

• 200 sq ft office in a 1,500 sq ft apartment
• Business-use percentage: 200/1,500 = 13.33%
• Annual rent: $48,000 ($4,000/mo)
• Utilities: $3,600
• Renters insurance: $360
• Internet: $900

Simplified method: $5 × 200 = $1,000

Actual method: 13.33% × ($48,000 + $3,600 + $360 + $900) = 13.33% × $52,860 = $7,046

The actual method saves $6,046 more in deductions — at a 24% marginal tax rate, ~$1,450 in tax savings.

Concrete example: Owned home in suburb

Setup:

• 250 sq ft office in a 2,500 sq ft home
• Business-use percentage: 10%
• Mortgage interest: $18,000
• Property taxes: $8,000
• Utilities: $3,000
• Insurance: $1,200
• Home cost basis (less land): $400,000
• Depreciation: $400,000 × 10% / 39 = $1,026/yr

Simplified: $5 × 250 = $1,250

Actual: 10% × ($18,000 + $8,000 + $3,000 + $1,200) + $1,026 = $3,020 + $1,026 = $4,046

The depreciation portion creates a wrinkle — see recapture below.

The depreciation recapture trap

Under the actual method, you depreciate the business portion of your home. When you sell, that depreciation is recaptured at up to 25% — even if your home sale otherwise qualifies for the § 121 primary-residence exclusion.

Example: 10 years of $1,026 depreciation = $10,260 of cumulative recapture × 25% = $2,565 of extra tax when you sell.

This is why the simplified method is better for short-stayers in expensive neighborhoods — no depreciation, no recapture.

Substantiation rules

If you're audited:

• Photos of the office, ideally with no obvious personal items
• Floor plan with the office area marked and sq footage labeled
• Calendar/diary showing business use frequency
• Utility bills (12 months minimum)
• Mortgage interest statement (Form 1098)
• Property tax statement

The exclusive-use test is the hardest. A spare bedroom that's also a guest room → fails.

Day-care and storage exceptions

Pub 587 carves out two exceptions to exclusive use:

• Day-care providers — can deduct based on hours of business use even if the space is also family space (using a time formula)
• Inventory/sample storage — if you sell products and use part of your home for storage, exclusive use isn't required for that storage area

How Accountaxed handles it

Accountaxed lets you set your home office method (simplified or actual) in Setup. The actual-method calculator pulls expense allocations from your transactions automatically when categorized as Home Office, Utilities, Mortgage Interest, etc., applying the business-use percentage you configured.

Calculate your home office deduction → · Pub 587 Business Use of Your Home