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Everything You Need to Know about Mileage Reimbursements

Our definitive guide to mileage reimbursements
for personal vehicles in 2024

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Let’s start with a quiz: five questions about mileage reimbursements. It’s ok if you don’t know the answers. As you read this guide, you’ll find the answers woven throughout. 

How much do know about mileage reimbursements?

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Mileage logs

If your organization employs people who use a personal vehicle for work, you have a mobile workforce. Mobile employees make sales calls, manage accounts, provide training, attend conferences – and more. These employees should be compensated for the business use of their personal vehicle.

Your organization may pay a cents-per-mile reimbursement such as the IRS mileage rate or a monthly car allowance. If you’re paying a car allowance, read on to learn about mileage reimbursement, or check out our ultimate guide to car allowances.

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Every organization should ask these questions about its vehicle reimbursement plan:
  • How did you choose the mileage rate or reimbursement amount?
  • Does the reimbursement cover the expenses of every employee?
  • How long has it been since you last reviewed your plan?
  • Is your mileage reimbursement plan taxable?
  • If so, are you properly withholding taxes?

Obtaining the answers often takes time. As a result, many organizations opt to stick with the status quo rather than conduct a periodic review.

It’s easy to just pay the IRS mileage rate and leave it at that. Why expend time reviewing your policy when the one you’ve got is easy to understand and easy to administer?

But what if we told you that your mileage reimbursement may be costing the company in lots of small ways that add up to serious liabilities?

BG (1)
A well-crafted car reimbursement policy will assist a company in carrying out its objectives:
  • Increase cost-effectiveness and efficiency.
  • Ensure equitable treatment of employees.
  • Attract and retain top talent.
  • Reduce the risks associated with employee drivers.
ch1 steering wheel - costs mileage reimbursement covers

Chapter 1

What a mileage reimbursement actually includes

A lot of businesses just want to answer a single question:

What’s a reasonable mileage reimbursement in 2024?

Many will say the IRS standard business rate, or federal mileage rate – 67 cents per mile. But that response misunderstands employee vehicle reimbursement. To determine an appropriate reimbursement rate, you need to know what expenses a mileage reimbursement actually covers.

The most obvious expense is gas, but on average, gas only constitutes 17% of a driver’s vehicle expenses. Reimbursable expenses covers a wide range. By requiring an employee to use a personal vehicle for work, a company assumes an obligation to defray the full array of vehicle ownership costs. The employee is hazarding an expensive piece of personal property, and that employee should expect a comprehensive reimbursement for vehicle expenses.

A number of employee-friendly states (e.g. California, Illinois, Massachusetts, Rhode Island, North Dakota, and South Dakota) have labor laws protecting the use of a personal vehicle for work.

CA Labor Code Section 2802(a) states that:
“An employer shall indemnify his or her employee for all necessary expenditures or losses incurred by the employee in direct consequence of the discharge of his or her duties.”

Section 2802(c) defines “necessary expenditures” to include “all reasonable costs.”

What counts as “all reasonable costs”?

First, the employer has made vehicle ownership a condition of the job. That means reimbursement should include such ownership expenses as depreciation, taxes, car insurance, and registration.

Second, the addition of thousands of miles of business mileage means that personal vehicle will depreciate faster and require more frequent maintenance, replacing oil, tires, brake pads, etc.

California Labor Code 2802(a) self-audit


So beyond gas there's a wide array of expenses that can be challenging to calculate.

Complicating matters, different employees experience different costs. Michigan drivers pay the most for car insurance. California drivers pay high gas prices. Some employees travel 1,000 miles every month while others travel 3,000 miles.

We’ll discuss ways to address these differences, but if you’d like to see more specific comparisons of vehicle costs in different parts of the country, read 4 Steps to a Reasonable 2024 Mileage Rate.

Before making any adjustments to your rate, you need to figure out whether your mileage reimbursement should be taxed and whether it's actually the best policy for your organization.

ch2 car driving - reimbursements taxable?

Chapter 2

Is a mileage reimbursement taxable?

If your organization already pays a mileage rate, it may be because management was trying to avoid a taxable reimbursement plan.

As you consider changes to your mileage rate or switching to another reimbursement model, it’s important to know what IRS guidelines consider taxable (a.k.a. non-accountable) vs. non-taxable (a.k.a. accountable).

The primary distinction lies between reimbursement and compensation. If the employer can demonstrate that all payments distributed to offset vehicle expenses were matched to business use of the vehicle, then those payments are considered reimbursements. If the employer cannot demonstrate business use, the payments are considered compensation and therefore taxable.

Generally speaking, any mileage reimbursement up to the IRS business rate is exempt from taxation, whereas a standard monthly car allowance is taxable compensation.

Below is a list of common business vehicle plans and whether they are considered reimbursements (non-taxable) or compensation (taxable).


The company multiplies the employee’s monthly reported mileage by a specific cents-per-mile rate and pays the resulting amount. As long as this business mileage rate does not exceed the IRS business mileage rate ($0.67/mile for 2024), the payment is considered a reimbursement and non-taxable. The simplicity of this approach makes it by far the most popular of IRS accountable plans.


The company pays a fixed amount to each employee every month. This fixed amount is considered compensation and therefore subject to taxation at both the federal and state level. Furthermore, the employer must also pay FICA/Medicare taxes on the allowance.


To prove that a monthly car allowance is a reimbursement, a company can track the business mileage of its employees. This mileage is multiplied by the IRS mileage rate. The employee then receives the lesser of the car allowance amount and the mileage rate multiplied by the mileage.


Some companies pay a fixed amount along with a mileage reimbursement. The fixed allowance is taxable but not the mileage reimbursement, as long as the mileage rate does not exceed the IRS business rate.


Other companies supply employees with a gas credit card or reimburse the receipts for gas expenditures. Without mileage substantiation, the car allowance remains taxable, as well as any portion of the fuel expenditure that cannot be demonstrated as business use (unless the employer charges the employee back for the personal use).


Whereas the IRS mileage rate was designed to be a tax deduction tool for individuals, fixed and variable rate was designed for business reimbursements. A FAVR plan allows an employer to reimburse employees accurately while keeping the reimbursement tax-free. Using expense data for the employee’s garage zip code, the employer pays a combination of a fixed monthly amount and a variable reimbursement rate.


Out of these six options, most likely the best fit for your business will be a cents-per-mile rate or fixed and variable rate plan. The rest of this guide will focus on that question, examining the pros and cons of typical mileage reimbursement programs and how to adopt the right policy for your organization.

Ch3 smartphone map screen - mileage reimbursement company fit

Chapter 3

Is mileage reimbursement a good fit for your company?

The two most popular business vehicle policies – the standard car allowance and mileage reimbursement at the IRS, or government, mileage rate – are popular because they are easy to understand and simple to administer.

But simplicity and ease come at a cost.

As the mobile workforce has grown, these “one-size-fits-all” reimbursement models have become less of a “fit” for many organizations. The standard car allowance often fails to keep up with employee expenses because taxes reduce take-home pay and because it does not adjust up for drivers with large and/or expensive territories.

Similarly, the IRS mileage rate, created as an individual tax deduction tool, has become less suitable as the number of mobile employees and total mileage amounts have increased. The government mileage rate, intended only as a measure of average vehicle costs, cannot capture costs with precision. This lack of precision increasingly proves problematic as the number or variety of mobile employees increases within an organization.

Not only do employees drive different amounts, but they also face different geographically-sensitive costs.

Compare the average gas prices and insurance premiums across three different states:

graph-car-insurance-cost-comparison-MI-CA-AL graph-comparing-gas-prices-in-MI-CA-and-AL

A single mileage rate can work if all employees live in similarly-priced geographic regions and drive similar amounts per month. However, a company that operates in multiple regions will have employees facing very different geographically-sensitive costs, such as fuel and insurance.

A small company whose employees all drive between 1,000 and 1,500 miles per month may find the IRS mileage rate a suitable tool, but a larger company with more high-mileage employees may find the government rate unaffordable. The IRS rate will over-reimburse these high-mileage employees and under-reimburse drivers who cover small territories yet still face high fixed costs (e.g. insurance, depreciation, taxes).

Standardized car allowances and mileage rates share the same problem: equal compensation for unequal expense needs.


A standard rate or amount cannot address the variety of expense needs that arise with employees covering a variety of territory sizes in different parts of the country. Disparities will emerge:


To determine whether a mileage reimbursement is the best plan for your company, you need to fully explore the challenges inherent to paying a standard rate to a variety of mobile employees. The next section will delve further into each of these challenges and the reimbursement best practices needed to solve them.

Chapter 4

Chapter 4

What are the challenges of mileage reimbursement?

Mileage reimbursement at a standard rate creates three challenges that you need to solve: expense variations, lack of precision, and cost control.

If you do not have a reimbursement plan that follows best practices to address each of these challenges, the company can experience increased attrition rates, increased chances of labor code violations, and inability to rein in costs. 

1. Expense variations

In theory, a mileage rate should help with expense variations because more driving incurs more costs. In reality, vehicle expenses fall into two categories: fixed and variable.

Fixed costs, such as insurance, taxes, and depreciation, become less costly per mile when spread over a higher number of miles driven.

Variable costs, such as gas, maintenance, and tires, tend to increase with miles driven, though other factors such as gas prices impact these as well.

As a result, a high-mileage driver tends to be over-reimbursed relative to a low-mileage driver. Here’s an illustration using the 2019 IRS rate, which was $0.58/mile that year:

chart comparing 2 employees annual car reimbursement

Both employees pay the same amount for their driver’s license, vehicle taxes, and car insurance (for the most part). Employee B will spend more on maintenance and tires and spend a lot more for gas. But Employee B is not going to spend $14,210 more in gas, maintenance, and tires than Employee A. Plus, Employee A’s car depreciation by itself will likely exceed $2,000.

Here is a comparison of the average business costs of a midsize vehicle driven 5,500 vs. 30,000 miles:

chart comparing 2 employees annual vehicle costs

Employee A got shortchanged. Employee B made bank. This is a huge inequality, and it happens all the time.

Most mileage rates do not fluctuate with gas prices, adding to the problem. For example, the IRS rate only generally tracks with gas prices but historically has not adjusted with spikes.

2. Lack of precision

The IRS mileage rate was never designed to accurately reflect all motorists’ vehicle costs. Instead, the government rate is derived as an average of all vehicle expenses across the entire United States from the previous year, which works just fine in terms of taxation but less so for companies seeking to accurately reimburse employees.

Chart showing annual IRS mileage rate vs gas prices

Different motorists in different parts of the country experience different levels of expense per mile driven. But as far as the IRS is concerned, it all averages out across all tax returns. Some taxpayers end up deducting more than their actual costs, while others less than their actual costs – but it all evens out for Uncle Sam.

If mobile employees are being shortchanged by the IRS rate, they may drive unnecessary miles to increase their reimbursement. If they are being over-reimbursed, however, that becomes an expense problem for the company.

3. Cost control

Most companies rely entirely on the employee to record business mileage. This creates a cost control problem.

Because neither the IRS mileage rate nor most company-derived mileage rates adjust automatically with gas prices, there are times when a sudden increase in gas prices brings a sudden decrease in cash flow for the employee. The same thing happens if their insurance or personal property tax rates increase.

In situations where business expenses increase but the mileage rate stays the same or only slightly increases, an employee will seek ways to recoup the loss of income. Depending on what type of mileage log the company uses, this could mean adding extra mileage to the log, or it could mean driving extra, unnecessary miles.

If your company uses an Excel spreadsheet to record mileage, what’s to stop an employee from fudging the numbers? Similarly, if employees are estimating mileage to save time, why wouldn’t they “round up” in their calculations?

When reimbursing mileage, it can be very difficult to control costs because calculating the mileage reimbursement remains largely in the employee’s hands.

4 best practices to address mileage reimbursement challenges


Remember, the IRS rate is an average of all averages. You need to find out what range of expenses your employees experience in their respective territories and roles. A good starting point would be to look at gas prices, average insurance premiums, and tax rates in each employee’s territory. All of this information can be found through a simple Google search.

For a more comprehensive approach, contact mBurse to obtain cost data for each employee’s territory, which can help guide you in choosing an appropriate mileage rate that can be adapted to different employees’ needs.


If your mileage rate fluctuates with gas prices, employees will be far less likely to offset a price increase by reporting extra mileage. Make sure to have a person whose job involves evaluating the mileage rate on a regular basis to make sure it’s neither shortchanging nor overpaying employees.


Fixed and variable rate reimbursement combines practices 1 and 2. FAVR also addresses the discrepancy between high-mileage and low-mileage drivers by paying a set monthly amount in combination with a variable mileage rate.



When it comes to tracking business mileage, the most accurate mileage logs available today are GPS apps that employees can operate from their smartphones. These apps precisely capture business mileage without any manual reporting. The mBurse GPS app, mLog, offers features that protect each driver’s privacy.

These GPS mileage logs can also integrate with the company's CRM software and payroll software to keep employee time focused entirely on job responsibilities. There are quite a few options when it comes to mileage tracking and it's best to make an informed decision on what fits your company and culture.

ch5 - vehicles on city street - reimbursement effects on company

Chapter 5

How your vehicle reimbursement plan affects the whole company

Getting your vehicle reimbursement policy wrong can impact nearly every aspect of your organization.

We’ve already covered problems with cost control and inequitable compensation due to expense variations. But weaknesses in a reimbursement plan can impact other aspects of an organization:

Company risk management

When an employer reimburses employees insufficiently, those employees will seek recourse. Labor code lawsuits are a distinct possibility in employee-friendly states.

Or an employee might reduce his or her auto insurance coverage. If that employee causes a car accident while working, any gap between the employee’s insurance and the costs of the accident will now become the responsibility of your company.

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  • Employee productivity

    Under-reimbursement can also drive a wedge between reported mileage and employee productivity. If your drivers self-report their mileage, they may decrease driving while reporting the same mileage or increase reported mileage without increasing productivity.

    A mileage reimbursement incentivizes the accumulation of mileage, not improvement in sales or client relationships. In the end, employees may focus more on protecting their income than on protecting client relationships or boosting sales. 

  • Attraction and retention of employees

    Insufficient or inequitable reimbursement for vehicle expenses will drive some employees out the door. Look at your attrition rates. Has employee attrition increased over time? The company mileage rate may not cover the fixed costs of drivers with small or expensive territories.

    Potential employees will also learn what they can about the company’s car reimbursement plan. If they project insufficient reimbursement, they may not accept a job offer or apply in the first place.

Chapter 6

Chapter 6

Why tax rules put pressure on your vehicle reimbursement policy

Vehicle reimbursements have assumed even greater importance under the current tax code.

Under the Tax Cuts and Jobs Act (TCJA), enacted December 21, 2017, employees cannot write off unreimbursed business expenses during the 2018-2025 tax years.

In the past, an employee receiving a mileage rate less than the IRS business rate could deduct the difference between their company’s mileage rate and the IRS rate. An employee receiving the IRS rate could deduct the difference between actual expenses and the total mileage reimbursement benefit.

Either way, the employee had recourse to offset an insufficient car reimbursement plan. Now, drivers may seek other recourse, such as lawsuits for labor code violations.

The elimination of this popular deduction puts pressure on companies operating in employee-friendly states like California and Massachusetts with labor codes that indemnify employees from business expenses. These labor laws strictly prohibit companies from passing on business expenses to employees.

In January 2019, Illinois enacted the same kind of law. Other states may also begin dictating full reimbursement in the wake of tax reform. There’s already a group of states with labor code protections that favor employees when it comes to business expenses (CT, RI, MI, ND, and SD).

Employees will increasingly pursue full reimbursement from their employers. State legislatures will increasingly face pressure to pass new labor laws protecting employees.

TCJA mobile employee reimbursement eBook

Reimburse your mobile employees with the tax reform

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Among employees who receive a mileage reimbursement, the two groups most affected by the tax reform will include low-mileage drivers and moderate-mileage drivers operating in expensive geographical locations. Comparing two drivers under the pre-2019 tax code shows why:


Both drivers received a helpful benefit under the old tax code that the slightly reduced income tax brackets will not be able to offset.

Without a response to this new tax code reality, companies may lose employees like Driver 1 and Driver 2, or find themselves in court – which could get a lot easier as state legislatures strengthen labor laws in response to the TCJA.

The reality should add urgency to determining a fair auto reimbursement rate in 2023.

ch7 calculate best 2024 mileage reimbursement

Chapter 7

What's your optimal mileage rate in 2024?

The current tax landscape combined with rampant inflation necessitates getting your car reimbursement policy right.

For four years now millions of mobile employees have filed tax returns without being able to write off vehicle expenses using Form 2106. Employers that have not increased their vehicle reimbursements commensurably are facing renewed pressures.

From 2021 through 2023, inflation hit vehicle costs hard. Workers are feeling whiplash and financial uncertainty. They need to know that their employer will responsively make adjustments to protect their income.

Unless you’re already properly reimbursing your employees, sticking with the status quo will hurt your company and your employees.

Take concrete actions now to review and adjust your car reimbursement plan according to best practices. At the very least, take the following steps:

  • 1. Estimate employee car expenses and compare these with their reimbursement amounts.

  • 2. Determine if the current range for employee mileage is creating inequitable reimbursement or cases of under-/over-reimbursement.

  • 3. Determine whether reported mileage matches actual employee productivity.

  • 4. If you aren’t using a GPS-based mileage log, research this new technology.

  • 5. Explore FAVR reimbursement. FAVR is the most accurate and defensible policy, addresses the tax code changes, and solves pandemic-related car reimbursement challenges.

So...what’s the best mileage reimbursement rate?

Hopefully, you’ve figured out the answer: It’s complicated!

Because two employee drivers within a single organization can experience widely different costs, and because mileage rates do not sufficiently address fixed vehicle costs, there’s no quick and easy way to determine the right reimbursement amount. To determine the right amount, you have to know the employee’s zip code and geographically-influenced fixed costs. You also need to attend to the ratio between the mileage driven and actual expenses.

But there are some clear-cut principles that you can follow that will work under all circumstances, including the unpredictability introduced by the pandemic these past two years:

  • t-shirt-icon-avoid-one-size-fits-all-reimbursement

    One-size-fits-all CANNOT be your solution

    Because the expenses among employees will vary, the mileage reimbursement rate must be able to generate geographically-sensitive payment amounts. It’s possible that a small company with a narrow range of employee expenses can get away with a standard mileage rate, but even then there will be disparities between expenses and reimbursement for some employees

  • pointer-icon-signifying-precise-data-driven-reimbursement

    Territory size and miles MUST factor into the amount the employee receives

    The number of miles driven affects everything from fuel consumption and tire wear to maintenance and depreciation. Remember that high-mileage employees can end up being over-reimbursed once they reach a certain number of miles, if they are paid a flat mileage rate. Similarly, low-mileage employees can get shortchanged if their mileage rate does not cover their fixed expenses like depreciation and insurance.

  • gas-pump-icon-for-geographical-cost-differences

    Geographically-based costs MUST affect the amount the employee receives

    Gas prices, insurance premiums, taxes/registration/license fees, and maintenance costs are all regionally-sensitive. And some of them will be a lot higher than you expect. It’s vital to calculate, given a reasonably-sized vehicle garaged in a particular zip code, what each employee’s expenses will be and to incorporate that data into the amount the employee receives.

Using vehicle data to calculate reimbursement rates

In summary, accurate vehicle cost data must drive accurate vehicle reimbursements. This is the only way to ensure equitable reimbursement and to rein in costs from over-reimbursement and protect employees from under-reimbursement.

To give you an idea of actual vehicle cost data, we’ve created a helpful graphic below. Look at different parts of the car image to discover the average amount U.S. drivers experienced in each vehicle expense category a couple of years ago. What you find may surprise you.

Car graphic showing fixed and variable annual expenses

When you add up these average annual costs, you get a monthly expense of $615.50. And that’s average. If you had been paying the IRS mileage rate of $.56/mile in 2021, your employees needed to drive 1,099 miles per month to break even. And that’s if they experienced average annual costs. (Since then, costs have increased by 20 to 30% across the country!)

But what if they drove 1,200 miles/month in California, with some of the highest gas prices and maintenance costs in the U.S.? Or in Michigan, where insurance rates are the highest in the country? Did that extra 130 miles net the amount they need to cover their geographically-based costs?

And what about depreciation and insurance costs for low-mileage drivers? Together make up 60% of the costs of owning a car and have little relationship with miles driven.

From the company perspective, you’ve also got a cost-control problem from high-mileage drivers putting in 2,000 or 3,000 or 4,000 miles per month. That IRS rate will rapidly exceed the drivers’ actual expenses, especially if they live in less expensive parts of the country.

Where do you go from here?

Well, you could use these average costs to estimate the needs of your individual employees based on whether they face below average or above average costs as determined by geographic location, territory size, and vehicle type. But you could also use tools that will give you more specific data.

mBurse can quickly provide the data and pinpoint an ideal car allowance amount or mileage rate for your drivers. Read 4 Steps to a Reasonable 2024 Mileage Rate or visit our Professional Services page to explore mBurse offerings.

ch8 reimbursement conclusion Background_blue

Chapter 8

Fix your vehicle reimbursement for 2024

You have a responsibility to protect each employee’s income from the costs of using a personal vehicle for work.

There are IRS-accountable plans designed specifically to help businesses address the variety of vehicle expenses their employees experience. The time is now – review the recommendations throughout this guide, and commit to developing a cost-effective policy that pays a fair and reasonable vehicle reimbursement.

If you wait until next year to make changes to your mileage reimbursement policy, what will the consequences be?

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