Is Car Loan Interest Tax Deductible? (Business Use Only)

P142: /tax-answers/is-car-loan-interest-tax-deductible/

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Meta Title: Is Car Loan Interest Tax Deductible? (Business Use Only)

Meta Description: Car loan interest is only tax deductible when the vehicle is used for business. Learn the 2025 rules, mileage vs. actual expense methods, and calculations.

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      "text": "Car loan interest is only tax deductible if the vehicle is used for business purposes. Personal vehicle loan interest is not deductible. For business use, you can deduct the portion of interest that corresponds to your business use percentage using either the standard mileage rate method or the actual expense method on Schedule C."
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H1

Is Car Loan Interest Tax Deductible?

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ANSWER SECTION

Car loan interest is only tax deductible if you use the vehicle for business purposes. Personal vehicle loan interest is not deductible—the IRS eliminated this deduction decades ago. For business use, you can deduct the portion of car loan interest that corresponds to your business use percentage. If you use your car 60% for business, you can deduct 60% of the annual loan interest. This deduction is claimed on Schedule C for self-employed individuals or as an unreimbursed employee expense (currently suspended for W-2 employees through 2025).

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H2: Personal vs. Business Use Rules

Personal Use:

Scenario	Deductible?	Notes
Commuting to work	No	Never deductible
Personal errands	No	Not business use
Family car	No	Personal expense
Second car for pleasure	No	Personal expense

Business Use (Deductible):

Scenario	Deductible?	Notes
Self-employed business travel	Yes	Schedule C
Rideshare driving (Uber/Lyft)	Yes	Business use
Delivery driver	Yes	Business use
Real estate agent showings	Yes	Business use
Sales calls	Yes	Business use

W-2 Employees:

• Car loan interest not deductible for W-2 employees (2018-2025)
• Suspended by Tax Cuts and Jobs Act
• May return in 2026 unless extended

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H2: Calculating Business Use Percentage

Record Keeping Requirements:

To claim car loan interest deduction, you must track:

• Total miles driven during year
• Business miles driven
• Date, destination, purpose of business trips
• Starting and ending odometer readings

Business Use Formula:

Business Miles ÷ Total Miles = Business Use Percentage

Example:

• Total miles: 15,000
• Business miles: 9,000
• Business use: 60%
• Personal use: 40%

Documentation Methods:

Mileage Log (Required):

• Physical notebook
• Spreadsheet
• Mobile apps (MileIQ, Everlance, Stride)

What to Record:

• Date of trip
• Starting location
• Destination
• Business purpose
• Miles driven

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H2: Two Methods to Deduct Car Expenses

Method 1: Standard Mileage Rate

2025 Rate: $0.70 per business mile

What It Covers:

• Gas and oil
• Maintenance and repairs
• Depreciation
• Insurance
• Registration fees
• NOT car loan interest separately

When Interest Is Included: The standard mileage rate includes an allowance for vehicle costs, so you cannot separately deduct loan interest using this method.

Best For:

• Lower-priced vehicles
• Low mileage drivers
• Simple record keeping

Method 2: Actual Expense Method

What You Can Deduct (Business Portion Only):

• Gas and oil
• Repairs and maintenance
• Tires
• Insurance
• Registration fees and licenses
• Car loan interest
• Lease payments (if applicable)
• Depreciation

Car Loan Interest Calculation:

Example:

• Annual car loan interest: $1,200
• Business use percentage: 60%
• Deductible interest: $1,200 × 60% = $720

Best For:

• Expensive vehicles
• High mileage drivers
• When actual costs exceed standard rate

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H2: How to Claim the Deduction

For Self-Employed (Schedule C):

Step 1: Choose Your Method

• Decide between standard mileage or actual expenses
• Must use actual expense method to deduct loan interest

Step 2: Calculate Business Percentage

• Complete mileage log
• Calculate business use percentage

Step 3: Calculate Deductible Interest

• Annual loan interest × business percentage
• Keep loan statements as proof

Step 4: Report on Schedule C

• Line 16b: "Other interest" OR
• Include with other actual expenses
• Total car expenses go on Line 9

Required Records:

• Mileage log for entire year
• Loan statements showing interest paid
• Receipts for other car expenses (actual method)

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H2: Special Situations

Vehicle Financed Through Dealer vs. Bank:

Bank Loan:

• Interest clearly stated on Form 1098
• Easy to identify amount
• Deductible portion straightforward

Dealer Financing:

• May be harder to separate interest from principal
• Request amortization schedule
• Interest is still deductible business portion

Leased Vehicles:

• Lease payments deductible (business portion)
• No loan interest (you don't own the vehicle)
• Different calculation than owned vehicles

Heavy Vehicles (Over 6,000 lbs):

• May qualify for Section 179 deduction
• Can deduct larger portion in first year
• Special rules apply for SUVs and trucks

Electric Vehicles:

• May qualify for EV tax credit
• Credit applies separately from expense deduction
• Business use percentage applies to credit too

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H2: Related Tax Questions

For information on car insurance deductibility, see our guide on is car insurance tax deductible covering business vs. personal coverage.

Learn about employee expense deductions in our guide on job expenses W-2 income with TCJA suspension rules.

For other unreimbursed employee expenses that are suspended, see our guide on unreimbursed employee expenses with the complete list.

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