When employees use personal vehicles for work, employers may consider adding a fuel card or fuel reimbursement to help with rising driving costs. That can feel simple, but fuel-only payments rarely solve the full reimbursement problem.
Fuel is only one part of employee vehicle costs. Employees may also incur insurance, maintenance, depreciation, registration, taxes, tires, oil, parking, tolls, and other business-related expenses.
Before adding a fuel card, employers should compare the tax treatment, documentation requirements, cost-control issues, and fairness of fuel cards, fuel reimbursement, mileage reimbursement, and FAVR.
Quick Answer: Should Employers Use a Fuel Card or Reimbursement?
A fuel card can be convenient, but it may create tax, documentation, and cost-control problems when employees use personal vehicles for work. Employers generally need to separate business fuel use from personal fuel use and document the business purpose of the expense.
Mileage reimbursement or FAVR may be a better fit when the goal is to reimburse the full business-use cost of a personal vehicle, not just fuel. These methods can account for mileage, location, fixed vehicle costs, variable operating costs, and business-use documentation.
IRS guidance generally requires that business vehicle use be substantiated by mileage, the time and place of travel, and the business purpose. When vehicle use is not substantiated as business use, the value may need to be treated as taxable income.
Why Employers Consider Fuel Cards or Fuel Reimbursement
Employers often consider fuel cards when employees complain that a car allowance is not enough, when gas prices rise, or when employees cover large territories. Fuel cards are also familiar because they are commonly used with company-owned fleet vehicles.
But fuel cards work differently when employees drive personal vehicles. The company is paying for one vehicle expense without necessarily addressing the full cost of business driving. That can create gaps if the employee still pays out of pocket for insurance, maintenance, depreciation, registration, taxes, tires, or other required vehicle costs.
Fuel reimbursement should be evaluated as part of the broader vehicle reimbursement program, not as a stand-alone fix.
3 Reasons to Rethink Fuel Cards for Personal Vehicles
1. Fuel cards are affected by employee vehicle choice
Employees choose vehicles for personal and family reasons, not only business efficiency. If one employee drives a fuel-efficient sedan and another drives a large SUV or pickup, fuel-card costs can vary significantly even when both employees perform similar work.
A fuel card can unintentionally shift the cost of personal vehicle choices to the employer. That makes it harder to manage reimbursement fairly across employees.
2. Personal use can be hard to separate from business use
When employees use personal vehicles for both work and personal driving, employers need a clear way to separate business fuel from personal fuel. Without accurate mileage records, approval workflows, and fuel-use policies, personal fuel can be mixed into business expenses.
This can create tax and reimbursement issues because business use must be documented. A fuel card is not automatically tax-free just because it is used by an employee.
3. Fuel cards do not cover the full cost of driving
Fuel is only one part of vehicle reimbursement. Employees who drive personal vehicles for work may also incur business-use costs for insurance, depreciation, maintenance, tires, registration, taxes, parking, tolls, and other expenses.
If the company only pays for fuel, employees may still feel under-reimbursed. If the company pays both a car allowance and a fuel card, the program may become more expensive and harder to administer.
Better Alternatives to Fuel Cards or Fuel-Only Reimbursement
If employees use personal vehicles for work, the reimbursement method should cover more than just fuel. Employers should review whether the program covers the business-use portion of both fixed and variable vehicle costs.
1. Accountable mileage reimbursement
Mileage reimbursement is generally tax-free when payments have a business connection, employees adequately account for the expense within a reasonable period, and excess reimbursements are returned when required. Employers should require mileage records that show the date, destination, business purpose, and miles driven.
2. A substantiated car allowance
A car allowance may be easier for employees to understand, but it is often taxable if paid without business-use documentation. Employers that want tax-efficient payments should review whether the allowance can be structured using accountable plan controls.
3. FAVR reimbursement
FAVR, or Fixed and Variable Rate reimbursement, separates fixed vehicle costs, such as insurance, depreciation, registration, taxes, and license fees, from variable costs, such as fuel, oil, tires, and maintenance.
This can be a better fit for employers with frequent drivers, different mileage levels, or multiple territories because it reimburses more than fuel while still tying payments to documented business use.
FAQs About Fuel Cards and Reimbursement
Are fuel cards taxable to employees?
Fuel cards can create taxable income when personal use is not separated from business use or when business use is not properly substantiated. Employers should document mileage, business purpose, time, place, and fuel use.
Is a fuel card better than mileage reimbursement?
A fuel card may be useful for company-owned fleet vehicles or controlled fuel programs. Mileage reimbursement may be better for employees who use personal vehicles because it ties reimbursement to approved business miles instead of fuel purchases alone.
Does a fuel card cover the full cost of using a personal vehicle for work?
No. A fuel card only addresses fuel. Employees may also incur business-use costs for insurance, maintenance, depreciation, registration, taxes, tires, oil, parking, and tolls.
Can employers give employees both a car allowance and a fuel card?
Yes, but this can increase tax complexity, documentation requirements, and total program cost. Employers should confirm how business use will be substantiated and whether the combined program creates overpayment or tax waste.
What is a better alternative to a fuel card?
Mileage reimbursement, accountable reimbursement, or FAVR may be better options depending on employee mileage, territories, tax treatment, and administrative resources.
Can FAVR replace a fuel card?
FAVR may replace a fuel card for employees who use personal vehicles for work because it accounts for both fixed vehicle costs and variable operating costs, including fuel.
Not sure whether a fuel card or reimbursement is the right fit for your mobile employees? mBurse can help you compare fuel cards, fuel reimbursement, mileage reimbursement, car allowances, and FAVR to identify where your program may be creating tax waste, cost leakage, or reimbursement gaps.
