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Expense Reimbursements And Payroll: How Employee Expenses Affect Payroll, Taxes, And Compensation

Employees frequently pay business expenses out of their own pockets and then request reimbursement from their employer. These expenses can include mileage, travel, meals, lodging, supplies, equipment, and other costs incurred while performing services for the employer.

Expense reimbursements can create an important connection between payroll, accounting, human resources, and tax compliance. Some employee business expense reimbursements can be excluded from an employee's wages when the applicable requirements are satisfied. Other payments may need to be treated as taxable compensation.

Understanding the interaction between expense reimbursements and payroll can help payroll professionals determine when a reimbursement should be processed through payroll, when it may be handled through accounts payable, how documentation affects tax treatment, and when payroll taxes may apply.

What Are Employee Expense Reimbursements?

An employee expense reimbursement generally occurs when an employee pays for an expense related to the employer's business and the employer subsequently repays the employee. Common employee expenses can include:

• Business mileage

• Business travel
• Airfare
• Lodging
• Business meals
• Parking and tolls
• Business supplies
• Professional expenses
• Business-related equipment
• Cell phone and communication expenses
• Relocation expenses
• Other authorized business expenses

The tax treatment of an expense reimbursement depends on the nature of the expense, the employer's reimbursement arrangement, the documentation provided by the employee, and applicable federal, state, and local requirements.

A common payroll mistake is to assume that every payment made to reimburse an employee is automatically nontaxable. The payment must meet applicable requirements to receive favorable tax treatment.

How Do Expense Reimbursements Affect Payroll?

The interaction between expense reimbursements and payroll generally begins with determining whether the payment represents a legitimate business expense reimbursement or taxable compensation. The payroll process generally involves several important steps.

• Identify the Expense: Determine what expense the employee incurred and whether it was related to the employer's business
• Review the Reimbursement Arrangement: Determine whether the employer has an accountable plan or another reimbursement arrangement
• Review Documentation: Verify that the employee has provided the required information and supporting documentation
• Determine Tax Treatment: Determine whether the reimbursement qualifies for exclusion from the employee's wages or must be treated as taxable compensation
• Process the Reimbursement: Determine whether the payment should be processed through payroll or accounts payable according to the employer's procedures
• Apply Payroll Taxes When Required: If a reimbursement is taxable, payroll must account for applicable withholding and employment taxes
• Maintain Records: Retain appropriate documentation supporting the reimbursement and its tax treatment

Because expense reimbursements can be mistaken for compensation, payroll professionals need a consistent process for reviewing and classifying reimbursement payments.

What Is an Accountable Plan?

An accountable plan is an employer reimbursement arrangement that can allow qualifying employee business expense reimbursements to be excluded from the employee's wages when the applicable requirements are satisfied.

Generally, an accountable plan requires the expense to have a business connection and requires the employee to adequately account for the expense to the employer within a reasonable period. Employees may also be required to return amounts received in excess of the substantiated business expense.

When the applicable requirements are satisfied, qualifying reimbursements under an accountable plan generally are not treated as taxable wages to the employee.

Payroll professionals should understand the requirements of the employer's reimbursement arrangement and coordinate with accounting or other responsible departments to ensure that reimbursements are handled consistently.

Taxable vs. Nontaxable Expense Reimbursements

One of the most important payroll responsibilities involving employee expenses is determining whether a reimbursement is taxable or nontaxable.

Nontaxable Expense Reimbursements

Qualifying business expense reimbursements under an accountable plan can generally be excluded from an employee's wages when the applicable requirements are met. Examples can include properly documented:

• Business mileage reimbursements
• Business travel expenses
• Business lodging expenses
• Business meals when applicable requirements are satisfied
• Parking and toll expenses
• Other qualifying employee business expenses

The reimbursement should be supported by appropriate documentation and should satisfy the requirements of the applicable reimbursement arrangement.

Taxable Expense Reimbursements

A reimbursement may become taxable compensation when the applicable requirements for exclusion are not satisfied. Examples of situations that can create taxable treatment include:

• Failure to substantiate the business expense
• Failure to establish a business connection
• Excess amounts that are not returned when required
• Payments that represent personal expenses rather than business expenses
• Allowances that do not satisfy applicable reimbursement requirements
• Payments made under arrangements that do not qualify for exclusion from wages

When a reimbursement is taxable, payroll may need to include the applicable amount in employee wages and account for the required payroll taxes and reporting.

Expense Reimbursements and Payroll Taxes

Qualifying reimbursements under an accountable plan generally are not treated as wages and therefore generally are not subject to federal income tax withholding or Social Security and Medicare taxes.

When an expense reimbursement is treated as taxable compensation, however, the payment may become subject to applicable payroll taxes. Depending on the circumstances, taxable amounts may affect:

• Federal income tax withholding
• Social Security tax
• Medicare tax
• Additional Medicare Tax when applicable
• Federal unemployment tax when applicable
• State income tax withholding
• State unemployment taxes
• Local payroll taxes when applicable

Payroll professionals should not assume that every reimbursement has the same treatment for every type of payroll tax. The specific circumstances and applicable rules should be reviewed.

Expense Reimbursements: Payroll or Accounts Payable?

One of the practical questions employers face is whether employee expense reimbursements should be processed through payroll or accounts payable.

Qualifying business expense reimbursements do not necessarily need to be treated as payroll wages simply because the payment is made to an employee.

Employers may establish procedures under which certain reimbursements are processed through accounts payable, while taxable payments may need to be incorporated into payroll.

Payroll, accounting, and HR should coordinate to establish clear procedures covering:

• Which expenses are eligible for reimbursement
• Which department processes the reimbursement
• When payroll must be notified
• How taxable reimbursements are identified
• How employee documentation is reviewed
• How reimbursement corrections are handled
• How reimbursement records are retained

A clear division of responsibilities can help prevent reimbursements from being incorrectly processed as wages or incorrectly excluded from payroll.

Per Diems and Payroll

Some employers use per diem arrangements to reimburse employees for certain travel expenses.

A per diem can provide an employee with a predetermined amount for qualifying travel expenses rather than requiring the employee to submit individual reimbursement amounts for every expense.

Payroll and accounting professionals must understand the requirements applicable to the particular per diem arrangement and determine whether the payment qualifies for favorable tax treatment.

Proper documentation, business purpose, travel information, applicable rates, and other requirements may affect the tax treatment of a per diem payment.

When the requirements for exclusion are not satisfied, some or all of a payment may potentially be treated as taxable compensation.

Expense Advances and Payroll

Employers may provide employees with advances before business travel or before employees incur other authorized business expenses.

An advance is not automatically treated the same way as a properly substantiated reimbursement. The employer should establish procedures for documenting the expense and reconciling the advance with the employee's actual business expenses.

Employees may need to return amounts that exceed properly substantiated expenses under an accountable plan.

Payroll and accounting should have procedures for identifying outstanding advances and determining when additional action is required.

Documentation Requirements for Expense Reimbursements

Documentation is one of the most important elements of an expense reimbursement program. Depending on the type of expense, documentation may need to establish:

• Amount of the expense
• Date of the expense
• Business purpose
• Location of the expense
• Individuals involved when applicable
• Business mileage
• Travel dates
• Receipts and invoices when required
• Other information necessary to substantiate the expense

Payroll professionals should understand that a reimbursement cannot necessarily be treated as nontaxable simply because an employee states that the expense was business related.

Employers should establish consistent documentation requirements and procedures for reviewing reimbursement requests.

Expense Reimbursements and Employee Paychecks

Expense reimbursements can affect an employee's paycheck differently depending on whether the reimbursement is taxable.

A qualifying nontaxable reimbursement generally does not increase the employee's taxable wages in the same manner as regular compensation.

A taxable reimbursement, however, can increase taxable wages and may result in additional payroll tax withholding.

This can create situations in which an employee receives a reimbursement but also sees an increase in payroll taxes because some or all of the payment is treated as taxable compensation.

Payroll professionals should communicate the difference between reimbursement payments and taxable wages so employees understand how expense payments can affect their paychecks.

Expense Reimbursements and W-2 Reporting

Qualifying accountable-plan reimbursements generally are not included in the employee's taxable wages or reported as taxable compensation on Form W-2.

When a reimbursement is treated as taxable compensation, however, the applicable amount generally must be reflected in payroll records and year-end wage reporting.

Payroll professionals should review taxable reimbursements before completing year-end reporting and verify that:

• Taxable reimbursements have been properly identified
• Applicable payroll taxes have been calculated
• Employee records have been updated
• Reimbursement documentation has been retained
• Taxable wages are properly reflected in year-end reporting
• State and local reporting requirements have been addressed

Expense Reimbursement Policies

A written expense reimbursement policy can help establish consistent procedures for employees, payroll, accounting, and management. An effective policy should address:

• Eligible business expenses
• Expenses that are not eligible for reimbursement
• Documentation requirements
• Submission deadlines
• Approval procedures
• Business purpose requirements
• Mileage reimbursement procedures
• Travel and lodging requirements
• Meal reimbursement procedures
• Per diem procedures
• Expense advance procedures
• Procedures for returning excess advances
• Recordkeeping requirements

Payroll should understand the employer's expense reimbursement policy even when payroll does not directly process every reimbursement.

Why Payroll Training Matters for Expense Reimbursements

Expense reimbursements sit at the intersection of payroll, accounting, taxation, employee benefits, travel, and compliance.

Payroll professionals need to understand not only how to process reimbursement information but also how accountable plans work, when reimbursements can be excluded from wages, how per diems and advances are handled, and when a payment may become taxable compensation.

Payroll Training Center provides training focused on employee expense reimbursements and the payroll and accounting issues associated with reimbursement programs. Available expense reimbursement training includes:

• Rules And Requirements For Employee Expense Reimbursements: Training covering accountable plans, per diems, advance accounting, reimbursement processing through payroll or accounts payable, and best practices for employee expense reimbursements
• Compliance Tips For Employee Expense Reimbursements: Training covering IRS expense reimbursement requirements, payroll tax considerations, accountable plans, per diems, audit considerations, recordkeeping, and internal controls

Expense reimbursement training can help payroll professionals identify taxable and nontaxable reimbursements, understand accountable plan requirements, improve documentation procedures, and coordinate reimbursement processing between payroll and accounts payable.

Understanding expense reimbursements can help payroll professionals reduce errors, improve internal controls, communicate more effectively with employees, and support overall payroll compliance.

The Bottom Line: Expense Reimbursements and Payroll Are Closely Connected

Employee expense reimbursements may begin as business expenses paid by employees, but their treatment can have significant payroll and tax implications.

A strong reimbursement process should connect employees, managers, accounting, payroll, and benefits or HR teams so that expenses are properly documented, reviewed, classified, processed, and reported.

For payroll professionals, understanding the interaction between expense reimbursements and payroll can help reduce errors, improve employee communication, strengthen internal controls, and support payroll and tax compliance.

Ready to strengthen your payroll knowledge? Explore expense reimbursement training and payroll compliance resources from Payroll Training Center.

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