A FAVR car allowance, short for Fixed and Variable Rate, is an IRS-recognized way for an employer to reimburse employees who drive their own vehicles for work. It pays a fixed amount for the cost of owning the car and a variable amount for each business mile. When the program meets IRS conditions, the payments are not wages. A plain monthly car allowance does not get that treatment, and FAVR is designed for companies with a group of regular drivers, not for a single owner running an S corporation.
This guide explains how FAVR works, how it compares with a flat allowance and with mileage reimbursement, and what a closely held S corp owner or a high-earning professional should do instead.
TL;DR
- FAVR pays a fixed component for ownership costs (depreciation, insurance, registration, taxes) and a variable component for operating costs tied to business miles (fuel, maintenance, tires, oil).
- A flat car allowance with no substantiation is generally treated as wages, subject to withholding and payroll taxes. Reimbursement under an accountable plan is not.
- FAVR has detailed eligibility, vehicle and calculation rules. It is rarely a practical fit for an owner-only S corp or a small practice.
- For most S corp owners, a written accountable plan with documented business mileage is the better starting point.
- Your employer or your corporation can pay less than the IRS standard mileage rate, but only a properly run accountable plan keeps the payment tax-free.
Table of Contents
- What FAVR actually is
- Car allowance vs. mileage reimbursement vs. FAVR
- Can an employer pay less than the IRS mileage rate?
- Worked example: three ways to pay a driver
- What this means for S corp owners
- Mileage records that hold up
- Our perspective
- Getting the plan set up
- Choosing the right method
- FAQ
- Sources
What FAVR actually is
FAVR is one of the IRS safe-harbor methods for reimbursing vehicle costs. It splits the cost of driving into two parts, because the two parts behave differently.
- Fixed payment: covers costs that exist whether or not the employee drives that month, such as depreciation, insurance, license and registration fees, and taxes.
- Variable payment: covers costs that rise with mileage, such as fuel, maintenance, tires and oil.
The IRS built the method around a fairness problem. A single cents-per-mile rate assumes ownership and operating costs move together, and that costs are the same everywhere. Revenue Procedure 2000-48 addresses this by letting a plan separate the components and base them on local cost data, so a driver in a high-insurance metro area is not paid the same as a driver in a low-cost rural one.
The IRS also caps the vehicle cost used in the calculation. For 2026, IRS Notice 2026-10 sets the maximum standard automobile cost at $61,700, including trucks and vans, effective for expenses paid or incurred on or after January 1, 2026.
Why it is not just a generous stipend
People search for "FAVR car allowance" and picture a monthly check. That is only half the structure. The fixed payment is periodic, but the variable payment follows actual business miles, and the calculation has to rest on locality-based consumer cost data that is reasonable and statistically defensible. A payment that outruns the plan's annual business-mileage assumptions is treated as taxable wages, a detail that simplified explanations often skip.
The IRS also ties FAVR to the employee's vehicle. Plans include conditions on how much the car cost when new relative to the standard automobile cost, and on minimum business use. Because those thresholds are updated and technical, check the current IRS guidance with a professional before building a program around them.
Car allowance vs. mileage reimbursement vs. FAVR
The names matter less than how the arrangement is built. The IRS question is whether the payment is connected to business expenses, substantiated, and reconciled. Under Treasury Regulation §1.62-2, an accountable plan needs three things: a business connection, adequate substantiation within a reasonable period, and return of any excess. Payments that fail those tests are nonaccountable and included in wages.
| Flat car allowance | Cents-per-mile reimbursement | FAVR | |
|---|---|---|---|
| How it is paid | Fixed monthly amount added to pay | Business miles times a rate | Fixed monthly amount plus a per-mile amount |
| Tax treatment | Usually wages, with payroll taxes | Not wages if accountable-plan rules are met | Not wages if the FAVR conditions are met |
| Mileage records | Often none | Required | Required |
| Best for | Simplicity, at a tax cost | Occasional or moderate driving | Regular drivers with substantial fixed vehicle costs |
| Administrative load | Light | Moderate | Heavy |
A cents-per-mile accountable-plan reimbursement is often the more practical choice for occasional or moderate business driving. FAVR makes more sense when drivers regularly carry substantial fixed vehicle costs and mileage differs by location.
The tax cost of a flat allowance
If your company pays a fixed $600 a month with no mileage log, the payment is generally reported as wages. That means withholding and employment taxes on both sides. The employee then loses the value of the money to taxes, and, as an employee, cannot generally deduct unreimbursed vehicle costs on a federal return. This is the "tax waste" that vendors of FAVR products talk about, and it is real. The fix, though, is not always FAVR. Often it is simply an accountable plan.
Can an employer pay less than the IRS mileage rate?
Yes. The IRS standard mileage rate is an optional method for substantiating and deducting vehicle costs. It is not a minimum an employer must pay. An employer can use a lower reasonable rate, but if the payment is meant to be nontaxable, the policy still has to meet the accountable-plan substantiation and return-of-excess rules.
For reference, the IRS set the 2026 business rate at 72.5 cents per mile, up 2.5 cents from 2025. Rates change every year, so never reuse last year's figure.
Worked example: three ways to pay a driver
Say a field technician at a service company drives 12,000 business miles a year. These figures are illustrative, not IRS or client figures.
- Flat allowance of $500 a month ($6,000 a year). No log is required, so the full $6,000 is treated as wages. A technician who drives 20,000 miles gets the same amount as one who drives 4,000.
- Accountable-plan mileage reimbursement. The technician logs 12,000 business miles and the company pays a reasonable per-mile rate on each. The payment is not wages if the plan is documented and administered properly, and it rises and falls with actual driving.
- FAVR. The company pays a locality-based fixed amount plus a per-mile amount. It can track real costs more closely, but it needs a standard vehicle profile, locality cost data, and ongoing administration.
For a company with two or three drivers, option two usually delivers most of the tax benefit with a fraction of the work.
What this means for S corp owners
If you own an S corporation, the practical question is different. You are both the shareholder and an employee, and there is no group of drivers to build a FAVR program around. The IRS rules are designed for an employer's allowance program with detailed eligibility, vehicle, mileage and calculation conditions. Calling a payment from your corporation to yourself "FAVR" does not make it tax-free.
A written accountable plan with documented business mileage is usually the more accessible route for a closely held corporation. A few points make it work:
- Pay as an employee, not a shareholder. The corporation reimburses you as an employee under a written, consistently administered policy. It should not be an informal shareholder distribution.
- Substantiate on time. Keep records of the date, the place or use, the business purpose and the mileage or amount of each trip.
- Return the excess. If you receive advances beyond substantiated expenses, the plan must require you to return the difference.
- Keep the vehicle question separate. Whether you reimburse mileage or deduct actual expenses is its own decision. Our guide to mileage vs. actual expenses walks through it, and the accountable plan rules for S corp owners cover the three IRS tests in more depth.
Entity structure shapes all of this. If you are still weighing whether an S corporation is the right container, the partner article on LLP, LLC and S corp options by state is a useful outside reference on how state rules can change the picture. For the federal side, see our comparison of S corp vs. C corp for owner-operators.
What about per diem?
Per diem works on the same logic as vehicle reimbursement. A per diem for travel is only tax-free when it sits inside an accountable plan: business connection, substantiation of time, place and purpose, and return of excess. An S corp can run both vehicle and travel reimbursement under one written plan. A flat daily amount with no travel records is a nonaccountable payment and becomes wages.
Mileage records that hold up
A total odometer number is not enough. For transportation expenses, IRS Publication 463 lists the elements to substantiate: amount, time, place or use, and business purpose. Commuting between home and a regular workplace is generally personal, not business mileage.
This catches nurse practitioners and multi-business owners more than most. If you move among clinics, offices, facilities and temporary work locations, the key question is whether each trip is business travel or nondeductible commuting. IRS staff correspondence on the issue, such as this 2010 information letter, makes the same point from the other side: a mileage app alone does not cure a weak business-purpose record. You still need contemporaneous details that show where the trip went and why it served the business.
A simple standard:
- Log each trip on the day it happens, with start and end points and the reason.
- Note which entity the trip served if you own more than one business.
- Reconcile the log monthly and reimburse only substantiated miles.
- Keep the written plan with your corporate records.
Our perspective
We work with business owners netting $300,000 to $1,000,000 a year, S corp owners, multi-entity operators and high-earning professionals. The vehicle conversation almost always starts the same way: someone has heard that a car allowance is a write-off, or that FAVR is the gold standard.
In our experience, the better question is who is paying whom, and under what written policy. For an owner-only S corp, FAVR adds complexity without a clear payoff. An accountable plan with clean mileage records gets you most of the way, and it is easy to defend because every dollar traces to a logged trip. Where larger vehicles are involved, a separate decision applies, and our guides on the 6,000 lb vehicle deduction and Section 179 vehicles cover it.
Solo and partnership practices build income. S corps help you keep more of it. The vehicle plan is one small piece of that, and it works best when it is set up once, written down, and followed all year.
— Melissa
Getting the plan set up
If you want a written accountable plan, a mileage policy and an entity structure that fit together, we can build that with you. The S-Corp Tax Strategy Accelerator is $997 one-off, and ongoing support is available through Monthly Tax Advisory at $11,997 per year or Quarterly Tax Strategy Sessions at $9,497 per year. Tax preparation fees are listed on our fee schedule.
To see how reimbursement fits into the broader S corp picture, start with our S corp tax planning guide. Our Idaho readers can also check the Idaho mileage reimbursement guide.
Choosing the right method
Use these questions to decide.
- How many employees drive regularly for work? A large group with high mileage points toward FAVR. One owner or a few drivers points toward an accountable plan.
- How much do they drive? Occasional or moderate driving suits cents-per-mile. Heavy, regular driving with high fixed costs is where FAVR can be more accurate.
- Do costs vary a lot by location? If so, FAVR's locality-based data helps.
- Can you administer it? FAVR needs vehicle profiles, cost data and monitoring. A mileage plan needs a good log and a written policy.
- What are the tax stakes? Any payment without substantiation risks being treated as wages, whatever you call it.
FAQ
What does FAVR mean?
FAVR stands for Fixed and Variable Rate. It is an IRS-recognized vehicle reimbursement method with a fixed payment for ownership costs and a variable payment tied to business miles. It is meant to reimburse employees more accurately than a single cents-per-mile rate.
Is a car allowance taxable?
Generally yes, when it is a flat amount paid without substantiation. The payment is a nonaccountable one and is included in wages, with withholding and employment taxes. A reimbursement under an accountable plan is excluded from wages when its requirements are met.
Can an S corp owner use FAVR?
It is rarely practical. FAVR rules are built around an employer's program for its drivers, with specific vehicle and mileage conditions. Most closely held S corps are better served by a written accountable plan with documented mileage, reviewed with a tax professional such as an enrolled agent or CPA.
Can a company pay less than the federal mileage rate?
Yes, because the IRS rate is an optional method, not a required minimum. The policy must still require substantiation and return of excess amounts if the reimbursement is to stay nontaxable.
Sources
- IRS Notice 2026-10: 2026 standard mileage rates
- IRS news release: 2026 business standard mileage rate
- IRS Revenue Procedure 2000-48
- 26 CFR 1.62-2: Reimbursements and other expense allowance arrangements
- IRS Publication 463 (2025)
- IRS information letter 2010-0044