Are gas and vehicle expenses tax deductible?
It depends. Vehicle costs (including gas) are often deductible to the extent the vehicle is used for business. If you also use the vehicle personally, you generally deduct only the business-use portion.
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On this page: Short answer · When it applies · When it doesn’t · Example · Records · Related · FAQ
Short answer
Depends. Gas and vehicle expenses may be tax deductible when they are incurred to earn business income, but you typically deduct only the business-use portion.
A mileage log (or equivalent records) is commonly used to support your business-use percentage.
When it’s more likely deductible
- You use the vehicle for business driving (client visits, job sites, deliveries, business errands)
- You track business vs personal use with a logbook or app
- You keep receipts for gas and other vehicle costs (maintenance, insurance, repairs)
- You apply the same allocation method consistently
When it’s not deductible (or risky)
- The driving is personal or commuting
- You claim 100% business use when personal use is clearly significant
- You don’t keep receipts or a mileage log
- The expense is reimbursed and you try to deduct it again
Example
Example: allocating vehicle costs
- Total annual vehicle costs (gas, maintenance, etc.): $6,000
- Business-use percentage (from logbook): 60%
- Potential deductible portion: $3,600
This illustrates allocation. The correct method depends on your situation and local tax rules.
What records to keep
- Mileage log (date, destination, business purpose, distance/odometer)
- Gas receipts and proof of payment
- Receipts for maintenance/repairs/insurance as applicable
- Notes tying business trips to invoices, clients, or projects
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Tools that can help
Mileage tracking apps help document business vs personal driving and support your allocation of gas and vehicle costs.
FAQ
Are gas and vehicle expenses tax deductible?
It depends. Gas and vehicle expenses may be deductible to the extent they are used for business purposes, typically based on a business-use percentage supported by records.
Can I deduct 100% of my gas if I use my car for business?
Usually no if there is any personal use. You generally deduct only the business-use portion, supported by a mileage log or other records.
What records should I keep for vehicle expense deductions?
Keep receipts for gas and other vehicle costs, proof of payment, and a mileage log to support business vs personal use.
Looking for related deductible expenses? ← See Is mileage tax deductible?
Last reviewed: January 2026