Vehicle compliance requirements: your checklist
Most vehicle deductions that fail on audit fail because of missing records, not wrong math. Here is what to keep, what to file, and the few rules for company cars, heavy vehicles and Illinois.
Prepared by Prem Tax and Accounting Corp. Last checked against official sources on October 20, 2026.
Before you buy or lease
- Write down the expected business-use percentage and who will drive.
- Find the weight rating (the GVWR label) and ask whether the vehicle is a "passenger automobile" under the 6,000-pound rule.
- Choose purchase, lease and the mileage method with your CPA. First-year choices can lock you in.
- Keep the purchase contract or lease, the weight label, and proof of the date the vehicle was placed in service (the day it was first available for use).
- In Illinois, tax is paid when the vehicle is titled. See below.
Every year
- A mileage log: date, miles, destination and purpose for each business trip, plus the odometer reading on January 1 and December 31.
- Receipts for actual costs if you use that method: fuel, repairs, insurance, registration, lease payments, tolls and parking.
- Form 4562, Part V if you claim the mileage rate, actual vehicle expenses (including depreciation) or depreciation on a vehicle. It asks for business, commuting and personal miles. A sole proprietor who claims only the mileage rate or actual costs without depreciation, and has no other reason to file Form 4562, reports the vehicle information in Part IV of Schedule C instead.
- Employers: Form 4562 also asks questions about vehicles provided to employees. Keep a written policy on personal use.
- Check the business-use percentage each year. If it dropped to 50% or less, tell us before filing.
Company vehicles and employees
- Personal use of a business vehicle by an employee or owner-employee is a taxable fringe benefit. Its value is included in wages, or the person pays it back. The IRS has special valuation rules: the cents-per-mile rule, the commuting rule ($1.50 for each one-way commute) and the annual lease value rule. The cents-per-mile and fleet-average rules can be used only for vehicles worth no more than $61,700 when first made available in 2026.
- Reimbursing employees: under an accountable plan, you can reimburse business mileage, for example at the IRS rate, without it being taxable wages, if employees substantiate their trips and return any excess.
- Employees who drive their own vehicle for work and are not reimbursed generally cannot deduct the cost on the federal return.
Heavy vehicles and trucking
- Heavy highway vehicle use tax (Form 2290) applies to highway motor vehicles with a taxable gross weight of 55,000 pounds or more. For July 1, 2026 to June 30, 2027, the return is due by the end of the month after the month the vehicle is first used on a public highway. A vehicle you expect to use 5,000 miles or less (7,500 for agricultural vehicles) can be reported with a suspension, so no tax is due unless it exceeds the limit.
- USDOT number: in general, required when you operate in interstate commerce and have vehicles over 10,000 pounds (gross vehicle or combination weight rating), carry 9 to 15 passengers for pay (including the driver) or 16 or more passengers, or haul hazardous materials. Purely in-state operations may be covered by state rules instead. FMCSA has a step-by-step tool to check.
- Commercial insurance and driver licensing rules are outside tax. Ask your insurance agent and the Illinois Secretary of State.
Illinois
- When you apply for an Illinois title for a vehicle you purchased, leased or received as a gift, you must pay the tax or show that none is due before it can be titled.
- The forms: RUT-25 (vehicle use tax return, within 30 days), RUT-25-LSE (lease transactions, within 30 days), RUT-50 (buying from a private party, within 30 days), and ST-556 and ST-556-LSE (dealer sale and lease returns, within 20 days of delivery).
- Buying from an out-of-state dealer, or moving into Illinois with a vehicle, has its own rules. Ask us or the Illinois Department of Revenue. Some local governments add their own taxes too.
Year-end checklist
Read the odometer
Record the reading on December 31 and compare it with January 1.
Total the business miles
Add the log, work out the business percentage, and split the miles at July 1 if you use the 2026 mileage rate.
Gather the papers
Purchase or lease contract, receipts, and the date placed in service.
List the changes
Vehicles bought, leased, sold or traded during the year, and any change in business use.
Tell us before we file
We will check the method, the caps and the forms for each vehicle.
Common questions
What if the IRS asks for my mileage records?
You must be able to show the date, miles, place and business purpose of each trip. Without adequate records the deduction can be disallowed, with possible penalties and interest. A log kept at the time of the trips is the best protection.
Do I need a separate vehicle for the business?
No. You can use one vehicle for both, as long as you deduct only the business share and can prove it.
Does a leased vehicle use the same forms?
Yes. If you claim the mileage rate or actual vehicle expenses, the vehicle questions go on Form 4562, Part V, or on Schedule C, Part IV for a sole proprietor who has no other reason to file Form 4562.
Do I need Form 2290 for a pickup truck?
Almost certainly not. The heavy highway vehicle use tax applies to vehicles with a taxable gross weight of 55,000 pounds or more.
Who can answer questions about my own vehicles?
Our retainer clients can call us for specific information about their own vehicles and tax situation. If you own a small business, consider becoming a retainer client.
Official sources
- IRS Publication 463: Travel, gift, and car expenses
- IRS: Instructions for Form 4562
- IRS Publication 15-B (2026): Employer's tax guide to fringe benefits
- IRS Notice 2026-10: 2026 standard mileage rates
- IRS: Form 2290 and the heavy highway vehicle use tax
- IRS: When Form 2290 taxes are due
- FMCSA: Who needs a USDOT number?
- Illinois Department of Revenue: tax requirements for cars, trucks and vans
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