Home Office and Mileage Deduction: How They Interact

Self-employed workers with a qualifying home office can claim both the home office deduction AND a much larger mileage deduction than workers without one. The two deductions stack independently and the interaction is one of the most valuable things in the self-employed tax code.

What home office unlocks for mileage

Without a home office, the drive from your home to your first business destination is commuting. Not deductible. With a qualifying home office, your home becomes your principal place of business. The same drive is now a deductible business mile. For a real estate agent, contractor, or freelance consultant who drives from home directly to client sites, this swings 30-60% of annual mileage from non-deductible commute to deductible business.

What qualifies as a home office

IRS test: a space used REGULARLY and EXCLUSIVELY for business. A spare bedroom that doubles as a guest room does not qualify. A converted attic or basement office that is only used for business does. The space does not need to be large.

Stacking example

A real estate agent works 60% at home (paperwork, communication, admin) and 40% at showings. With a 200 sq ft home office:

• Home office (simplified): $1,000 deduction (200 × $5)
• Mileage: 18,000 business miles × 72.5¢ = $13,050 deduction
• Total: $14,050 in combined deductions

Without the home office, the same agent would have been claiming maybe 10,000 business miles ($7,250 mileage) and zero home office deduction. The home office adds $1,000 directly AND unlocks $5,800 more in mileage deduction by reclassifying drives.

Where to claim each

• Home office: Form 8829 (actual method) or Schedule C, line 30 (simplified method)
• Mileage: Schedule C, line 9

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