IRS Mileage Log Requirements: Everything You Need to Know

On the surface, business mileage reimbursement is pretty straightforward. Mobile employees use their personal vehicles for work-related travel. They track that travel in a way that meets IRS mileage log requirements. The business then reimburses the employee, and takes their tax deduction. 

That process gets a lot less straightforward when those mileage logs don’t actually hold up under scrutiny. Error-ridden or incomplete logs violate IRS mileage log requirements that keep reimbursements accountable, or non-taxable, creating tax penalties for noncompliant business. Poor mileage records will also cause a lot of trouble in the event of an IRS audit. 

At CompanyMileage, we’re not in the habit of making things harder than they need to be. The opposite, actually. In this article, we’ll break down the IRS mileage log requirements, best practices for keeping compliant logs, and pitfalls to avoid. 

Let’s get started! 

Am I Required to Reimburse Mileage?

The short answer is no, not necessarily! There are no federal laws mandating that companies reimburse mobile employees for business travel mileage. Only three states (California, Illinois, and Massachusetts) have laws requiring organizations to reimburse employees for business use of their personal vehicles. 

However, even if a business is not legally required to do so, there are still many benefits to implementing a mileage reimbursement program for your employees. 

One benefit is the effect it has on your employees. Employees need to be treated well and have their contractual wage maintained, which can’t be guaranteed when company expenditures erode their income. When this is the case, employees are more likely to feel that they are unappreciated and disrespected by the company. Implementing an efficient mileage reimbursement is a fantastic way to ensure employees feel fairly treated and compensated.

Furthermore, if company expenditures—such as those incurred while driving a personal vehicle for work—erode employee income to the point that it technically falls below the federal minimum wage, you could be in violation of the Fair Labor Standards Act (FLSA). So, if your employees’ wages are already close to the federal minimum, it’s beneficial for both them and your business to implement a mileage reimbursement program. 

What Are the IRS Mileage Log Requirements?

IRS mileage log requirements state that mileage is reimbursable when employees travel from one place to another as part of their business or profession, to visit clients or customers, to attend meetings for business purposes, or from their home to a temporary workplace when they have one or more regular workspaces. 

Anything else, including commuting, side trips, and errands, is not considered eligible travel for reimbursement. 

IRS mileage log requirements state that employees must show that each logged trip was business-related. Logs must include the number of miles driven, the date and time of each trip, the starting and ending locations, and business purpose for each trip. You don’t need to write the great American mileage novel or anything, but logs should be specific enough to demonstrate that the trip had a legitimate business need. Vague entries like “client visit” or “errands” might not make the cut. 

IRS mileage log requirements also call for logs to be as timely and as accurate as possible. Mobile workers (or their employers) should log mileage shortly after the completion of each trip, not months or weeks after the fact. Sooner is always better, but weekly updates should suffice.

What Format Should Logs Take? 

The IRS has strict rules about what log entries must contain in order for reimbursements to stay accountable (ie, nontaxable). However, IRS mileage log requirements do not dictate what format that log takes. Paper logs, mileage spreadsheets, app-generated records…these methods are all allowed, even if some might be more advisable than others (more on that later!). 

How Long Should Logs be Kept?

The IRS requires that business records be retained for at least three years from the date the related return was filed. The responsibility for maintaining these records lies with the organization, not just with the employee. 

How Your Deduction Method Impacts Your Logging

There are two main deduction methods used to determine employee mileage reimbursements: the “standard mileage rate” method or the “actual expenses” method. 

Standard Mileage Rate

The standard mileage rate method, typically considered the easier and more straightforward approach, requires employees maintain an accurate log of business mileage driven in their vehicle, aligning with IRS mileage log requirements. This method usually doesn’t require tracking of other individual car expenses (such as repairs and fuel).

Companies calculate reimbursement for employees by multiplying their business mileage by a set mileage rate. Most businesses use the IRS standard mileage rate. This rate changes every year based on an analysis that determines the average cost of owning a vehicle in the US for that year. 

Do I Have to Use the IRS Standard Mileage Rate? 

Businesses that use a standard mileage rate to calculate reimbursement are not required to use the rate set by the IRS. After all, the IRS uses national averages to calculate the cost of owning and operating a vehicle, and some businesses prefer to use a rate more tailored to costs in their operating area.

If you do choose to reimburse at your own rate instead of theirs, remember that the standard mileage rate is the maximum for which businesses can reimburse for miles driven before the payment is considered taxable wages. Go higher than the IRS rate, and you’ll need to pay taxes on those reimbursements.

Reimbursing at a lower rate is typically an easy process. However, there are certain instances where businesses can’t reimburse at a lower rate, so make sure to educate yourself on reimbursement law before you make any changes to how you are reimbursing mileage to your employees.

If your business does decide to use a different rate than the IRS standard mileage rate, CompanyMileage offers a free rate calculator that you can use to find a rate that aligns with the cost of fuel in the company’s operating area. 

Actual Expenses

A more complex approach, the actual expenses method requires mobile workers to add up all the money actually spent in the operation of their vehicle, then multiply this figure by the percentage of the vehicle’s business use. 

Calculating actual expenses calls for much more detailed documentation than using the standard mileage rate method does (e.g., receipts for  maintenance, oil, repairs, etc.), especially when vehicle ownership/lease, depreciation or multiple expense categories apply.

Additionally, workers who use the actual expenses method in their vehicle’s first tax year of business use get locked into that method. If a vehicle’s first tax year of business use involves the standard mileage rate method, the employee can switch between the actual expenses and standard mileage rate methods from year to year if they so desire. 

Employees and employers need to choose the method that works best for their situation and furnish records and documentation that proves compliance with IRS mileage log requirements. 

That being said, the rest of this article will apply chiefly to organizations that use the standard mileage rate method for reimbursing work-related mileage. 

Where Most Mileage Logs Break Down 

The list of IRS mileage log requirements isn’t a long one, but when businesses fail to meet the standard of those requirements, they do so in pretty predictable ways. Some of the most common mileage logging issues include:

Missing or Vague Trip Details

As we’ve noted, logs must include the time, date, purpose, and locations for each work-related trip to meet IRS mileage log requirements. If these details are not provided (including any necessary documentation or receipts) or cannot be substantiated, that employee’s reimbursements may be reclassified as taxable income, losing your business a tax deduction. 

Incomplete or overly vague records often track back to the issue of timeliness. Employees who fill in mileage logs weeks or months after the actual trip(s) occurred are more likely to misremember important details – or forget them entirely. Logs should be accurate and as contemporaneous as possible to ensure con reliability, which helps substantiate claims and avoid audit risks.

Inaccurate Mileage Totals

Mileage tracking can get complicated and time-consuming, especially when employees calculate and log mileage using manual methods such as manual-entry spreadsheets or finding mileage totals by subtracting odometer readings. 

In manual reimbursement workflows, there is a lot of margin for error. A mobile worker might (accidentally or intentionally) record the wrong number on a spreadsheet, or make a miscalculation during odometer calculations.

If those errors aren’t caught and fixed when expense reports are submitted for approval, businesses pay the price, literally. Without visibility into how closely employees follow the IRS mileage log requirements, your business might end up reimbursing employees for miscalculated mileage, estimated mileage, or mileage that has been rounded up to a more ‘even number.’ 

Besides the real financial cost of dispensing inaccurate or inflated reimbursement payments, there can be a reputational one as well. When it becomes common knowledge that a business is allowing this kind of behavior, it’s never great for that business’s reputation. 

Mixing Eligible With Ineligible Travel

Mixing business and personal miles or including commuting miles is one of the most common mistakes an employee can make in a mileage log for IRS purposes. Even when done by accident, logging personal trips or side trips as reimbursable mileage is a common form of mileage fraud and could incur penalties or regulatory scrutiny. 

Consequences of Noncompliance

All that being said: If your company’s logs don’t meet the standards of the IRS mileage log requirements….then what? If that happens, you might find yourself (and your business) in hot water in a number of ways.

Financially

If employee logs don’t meet IRS mileage log requirements, then you run the risk of incurring legal or regulatory consequences. Usually, those come in the form of heavy fines. 

Additionally, if logs don’t meet the IRS mileage log requirements, then they’re definitely not meeting the standards for the IRS accountable plan. That means your business’s reimbursement payments will be subject to taxation. Additional penalties on every mobile employee in your workforce are sure to add up.

Time

We’ve already pointed out that mileage logging, when managed inefficiently, can be time-consuming for employees. When those employees don’t comply with IRS mileage log requirements, that creates an additional labor burden – this time for administrators, managers, and anyone else in your reimbursement system’s approval workflow.

It takes time and energy to identify, track down and correct lost, misplaced, or inaccurate mileage records. And if the IRS decides to audit your records, that’s more time and energy you’ll need to use to prove an audit trail, which is a lot harder to do with unorganized, noncompliant mileage logs.

Accountability

When employees know that they won’t be held accountable for providing accurate, timely mileage records, they may be more likely to enter incorrect information, try to receive reimbursement for ineligible travel (such as commuting miles), or simply not complete or submit their logs at all. Why bother complying at all when they know that noncompliance will pass without consequences?

Simple Habits That Make Mileage Logging Easier

Keep it Current

We’ll say it one more time: the IRS mileage log requirements call for near-contemporaneous logging, and there’s a good reason for that! Encourage employees to log trips as soon as possible (ideally real-time or daily) after they occur, rather than waiting weeks or months. 

Keep it Consistent

Choose a consistent format (paper, spreadsheet, or app) that works for your travel frequency and stick with it—consistency helps in case of audits. Employees should keep that system in their vehicles so they can log 

Keep Business and Personal Separate 

Clearly separate personal, commuting, and business trips in logs to avoid confusion or incorrect deductions. Retain logs and supporting documentation for the recommended time period (per IRS guidance), even after reimbursement or deduction claims.

Your Logging Options (And What Works Best)

We’ve talked about IRS mileage log requirements, common forms of noncompliance, and consequences of that noncompliance. Now, let’s talk about the “how” of the logs themselves.

Though there is flexibility in format (paper logbooks, spreadsheets, PDFs, or mileage-tracking apps are all considered acceptable by the IRS, as long as the required data is captured), not all methods are equal in terms of accuracy, efficiency, reliability, or audit defense. 

Odometer Readings and Other Manual Methods

Traditionally, recording and subtracting odometer readings has been the tried-and-tried way to manually calculate mileage totals. Employees who use this method record their odometer reading, then record it again after business travel, and subtract the difference. 

On the surface, this seems like a simple, practical solution. But using odometer readings to track mileage creates the same problems that manual logging solutions such as manual-entry spreadsheets and pen-and-paper mileage logs do. 

These methods take time, produce scattered, disorganized records, and have an extremely high margin for human error. A few misplaced pen strokes by a few distracted employees are all it takes to make a mileage record fall out of alignment with IRS mileage log requirements. 

Introducing Technology Into the Equation 

Automating the mileage tracking process can reduce the stress and annoyance you and your employees face when it comes time to track mileage for tax purposes. A wide variety of technological tools exist to make tracking mileage efficient and easy, complete with mileage tracking apps and digital mileage logs. 

Digital or app-based logs are extremely beneficial for frequent travelers. Automation helps reduce errors, improve timeliness, and simplify record-keeping (especially for multiple trips). Automated systems can also flag certain problematic behaviors, like duplicate reporting or edited entries, for further review so errors and fraudulent reporting don’t slip through systems unnoticed.

Because automated mileage log entries are made contemporaneous with travel, they serve as a much stronger audit defense than handwritten logs generated later. Another benefit of digital or app-based mileage logs are how they make use of GPS tracking and map data to precisely calculate mileage in compliance with IRS mileage log requirements. 

Meet All IRS Mileage Log Requirements With CompanyMileage

Even when all employees follow the IRS mileage log requirements, the submission and reimbursement process can have a high margin for error, and limited visibility. When you have hundreds of mobile employees submitting mileage logs, it can feel impossible to keep track of all that paperwork, let alone ensure its compliance. 

CompanyMileage offers the tools to make the daunting challenge of mileage reimbursement management – well, manageable! If you’re looking for a solution that will help your organization meet IRS mileage log requirements, ensure accuracy, and maintain accountability, you’re in the right place. Our suite of mobile workforce applications gives business owners an organized, accurate system for logging employee mileage.

SureMilage, our mileage reimbursement software, uses a point-to-point method to log mileage, in which workers input the start and end points for each trip. The system then takes those points and uses them to calculate the best route between them, and the reimbursement amount using that route. By utilizing automating tracking in this way SureMileage prevents inconsistencies, inaccurate mileage amounts, and personal errands from making their way into expense reports. 

With features like an offline mode, an integrated address book, and a Quick Capture widget, our mobile app, SureMobile, makes mileage tracking even easier for your hardworking employees. At the end of the day employees just have to take 5 minutes to organize their trips and submit any relevant receipts. Then they can edit and send expense reports right from their smartphones, no matter where they may be. 

Once submitted, those reports move through an automated approval workflow that can be easily customized to match the unique structure of your business. Our software also easily integrates with all major accounting and approval software, ensuring a smooth, streamlined process from start to finish. 

To learn more about how to optimize and simplify the mileage reimbursement logging process, contact CompanyMileage and request a demo today!