Is gas a business expense?

Is Gas Deductible as a Business Expense? What the IRS Says

Yes, gas is deductible for business driving, but not for commuting. If you use a vehicle for business, the IRS generally allows two ways to deduct those costs:

1. Standard mileage rate — 72.5 cents per mile for 2026
2. Actual expense method — deduct the business-use share of your real vehicle costs, including gas

Which method you choose matters, because the rules are different for each.

Standard Mileage Rate vs. Actual Expense Method

The two methods work very differently.

Standard mileage rate:
This is the simpler method. Multiply your business miles by the IRS rate (72.5¢ per mile in 2026). That rate already includes fuel and other operating costs, so you do not track gas separately under this method.

Actual expense method:
This method uses your real costs, including:

• Gas
• Oil
• Repairs and maintenance
• Insurance
• Registration
• Depreciation (if applicable)

Then apply your business-use percentage to those expenses.

One important rule: if you choose the actual expense method in the first year a vehicle is placed in business use, that can limit your ability to switch to standard mileage later, especially when depreciation methods are involved. This is a choice worth evaluating carefully.

Can You Deduct Gas AND Use the Standard Mileage Rate?

No.

You cannot deduct gas separately while also using the standard mileage rate.

That would be a double deduction, because the standard mileage rate already includes an allowance for:

• Fuel
• Oil
• Repairs
• Insurance
• Depreciation

Claiming gas on top of the mileage deduction is specifically not allowed and can raise audit concerns.

What Expense Category Does Business Gas Fall Under?

The category depends on how the gas is used.

Vehicle expenses
Example: Fuel for a company car used for sales calls.

Travel expenses
Example: Gas for driving to a client meeting or conference in another city.

Equipment operating costs
Example: Fuel for a gas-powered generator used on a job site.

The right category depends on the underlying business purpose.

Gas for Non-Vehicle Equipment: Generators and Machinery

Gas used for business equipment is different from fuel used in a vehicle.

Fuel for things like:

• Generators
• Construction machinery
• Landscaping equipment
• Other gas-powered tools

is not subject to mileage-rate rules at all.

It is generally treated as an equipment operating cost or supplies expense and can generally be deducted with receipts and documentation showing business use.

Commuting vs. Business Driving: The Key Distinction

This is where many deductions go wrong.

Commuting (not deductible):
Travel between your home and your regular workplace.

Business driving (generally deductible):
Travel:

• Between business locations
• To client or customer sites
• To temporary work locations
• For business errands

Home office exception:
If you have a qualifying home office that is your principal place of business, trips from that home office to other business locations may count as business driving rather than commuting.

That distinction can materially affect your deduction.

IRS Recordkeeping Requirements for Gas Deductions

The IRS expects contemporaneous records, especially for vehicle deductions.

A mileage log should include:

• Date
• Destination
• Business purpose
• Miles driven

If using the actual expense method, keep all gas receipts and related vehicle expense records.

As a general rule, retain records for at least three years from the filing date, which aligns with standard IRS record retention periods.

How Slash Helps Businesses Track Vehicle and Fuel Expenses

Slash is a business banking platform that can automatically capture fuel card transactions, categorize them as vehicle expenses, and separate direct fuel purchases from mileage reimbursement claims. Employees can also submit mileage claims directly through Slash for approval and payment.