What Are Reimbursable Expenses? A 2026 Guide for Employers and Employees

What Are Reimbursable Expenses

Reimbursable expenses are ordinary and necessary business costs that an employee or contractor pays out of pocket,t and the employer later reimburses. The phrase "ordinary and necessary" is IRS language: ordinary means the expense is common and accepted in the relevant trade or business; necessary means it is helpful and appropriate, even if not strictly required.

Three elements must be present for an expense to qualify:

• The cost was incurred for a legitimate business purpose
• The person who paid it has documentation to support the claim
• The employer repays it through a defined, compliant process

The third element is where most programs create unintended tax exposure. An expense can be entirely legitimate and still generate payroll tax liability if the reimbursement process does not meet IRS requirements. The compliance structure—not just the nature of the expense—determines the tax outcome. Managing this process efficiently starts with the right expense management software.

Reimbursable vs. Non-Reimbursable Expenses

The clearest way to understand the boundary is to look at both sides side by side.

The organizing principle is business purpose. An expense is reimbursable when it serves the employer's operations and would not have been incurred but for that business purpose. When the primary beneficiary is the employee's personal life, the expense falls outside the reimbursable category.

Gray Area Expenses: How to Decide

Some expenses do not fit neatly into either column. A working dinner that runs personally may have a genuine business component. A home office setup purchased during remote work serves the job but also benefits the employee. A phone used for both personal and business calls creates a split-use question.

The practical test for gray area expenses has two parts:

1. Would the employer require or expect this expense for the employee to do the job? If yes, the business connection is present.
2. Can the business portion be separated from the personal portion? If yes, only the business portion is reimbursable.

For split-use items, employers typically reimburse a documented percentage based on actual or reasonable estimated business use. For ambiguous one-time costs, the employee should document the specific business reason before submitting, and the employer should evaluate it against the written policy.

A written expense policy, discussed below, is the most reliable way to remove gray-area decisions from the approval queue and handle them consistently.

Common Categories of Reimbursable Expenses

Most employer reimbursement programs cover some version of these standard categories:

Travel

Airfare, rail, rental cars, and ride-sharing are used for business travel. Personal travel segments are excluded. Upgrades chosen for personal preference rather than employer requirement are generally not reimbursable. Employers looking to streamline travel cost booking and tracking can explore dedicated travel management software.

Lodging Hotel accommodations during business travel. The policy should specify whether a nightly rate cap applies.

Meals

Business meals with clients, prospects, or colleagues where a business purpose is documented. For 2026, business meal expenses are generally deductible at 50% of the cost under IRC §274(n), per IRS Publication 463 (2025 edition). The taxpayer or an employee must be present, and lavish expenses are not deductible. Note: a separate 2026 change eliminates the prior 50% deduction for employer-provided meals on business premises (cafeteria meals, convenience meals); those are now nondeductible starting in tax year 2026 as a result of the 2017 TCJA provision upheld by the OBBBA. Consult a tax advisor to confirm how the specific meal category you are reimbursing is treated.

Mileage

Personal vehicle use for business driving. The IRS sets an annual standard mileage rate, and sometimes a mid-year rate. For 2026, the IRS business standard mileage rate is 72.5 cents per mile, effective January 1, 2026 (IRS IR-2025-128). Because this rate changes, verify the current rate at IRS.gov before relying on this figure. Employers may also choose to reimburse at a lower rate or require employees to document actual vehicle costs. Automated mileage tracking tools can reduce the manual burden of logging vehicle use.

Home Office and Remote Work Supplies

For employees who work remotely, some employers reimburse costs such as internet service, office supplies, and equipment. Whether this is required depends on the employer's policy and, in some cases, applicable state law (see the State Law Considerations section below).

Professional Development

Registration fees, course costs, and related expenses for training directly relevant to the employee's current role.

Telecommunications

Business use of a personal phone or internet connection, typically reimbursed at a documented percentage of the monthly cost.

Client Entertainment

The Tax Cuts and Jobs Act (TCJA) eliminated deductions for most business entertainment expenses beginning in 2018. This treatment continues in 2026 and has been made permanent under the OBBBA. Entertainment expenses, including tickets to sporting events, golf outings, theater, and similar activities, are generally nondeductible even when the activity is with a client. Limited exceptions exist: company-wide employee parties where all staff are invited remain 100% deductible, as do entertainment costs reported as taxable compensation to the recipient or sold to customers for full value. If meals are separately invoiced at an entertainment event, the meal portion may still qualify for the 50% meal deduction. Confirm treatment with a tax advisor before classifying entertainment expenses as deductible.

IRS Rules: Accountable vs. Non-Accountable Plans

The IRS does not require employers to reimburse employee expenses. But when they do, the tax treatment of those reimbursements depends almost entirely on whether the employer operates an accountable plan or a non-accountable plan. This is one of the most consequential compliance questions in expense management, and it is frequently misunderstood.

This distinction determines:

• Whether the reimbursement is taxable income to the employee
• Whether it must appear on the employee's W-2
• Whether it is subject to payroll taxes
• Whether the employer can deduct the expense

An accountable plan is not a document or a registered program. It is a set of three requirements that the employer's reimbursement process must satisfy.

The Three Requirements of an Accountable Plan

1. Business Connection: The expense must have a genuine business purpose. Reimbursements for personal expenses do not qualify, regardless of how they are processed. The employee must be able to explain what business objective the expense served.

2. Adequate Substantiation: The employee must substantiate the expense with records showing the amount, time, place, and business purpose. For most expenses, this means a receipt plus a brief description of the business reason. The IRS expects substantiation to happen within a reasonable period of time. Modern receipt capture tools make it easier to collect and store documentation at the point of spend.

• IRS Safe Harbor: 60 Days for Expense Substantiation.n The IRS provides a safe harbor under which submitting expense documentation within 60 days of incurring or paying an expense is considered within the "reasonable period of time" standard. This is a safe harbor, not a statutory deadline. Employers may set shorter internal submission windows within their policy.

3. Return of Excess Advances If the employer provides an advance or allowance that exceeds the actual documented expense, the employee must return the excess amount.

• IRS Safe Harbor: 120 Days to Return Excess Advances. The IRS provides a safe harbor under which returning excess advances within 120 days of when the expense was paid or incurred is considered within the "reasonable period of time" standard. This is a safe harbor, not a statutory deadline.

When all three requirements are satisfied, the reimbursements under the plan are excluded from the employee's income and are not subject to withholding.

Consequences of a Non-Accountable Plan

When an employer's reimbursement process does not meet the three requirements above, or when an employee fails to substantiate an expense under an otherwise accountable plan, the payment is treated as a non-accountable plan reimbursement.

The consequence is straightforward: the reimbursement is treated as wages. That means it is included in the employee's W-2 income, subject to income tax withholding and employer payroll tax obligations, including FICA. Employers should consult a tax advisor or review IRS Publication 15 for the specific payroll tax implications, as the downstream mechanics extend beyond the foundational wage treatment.

For employers, this creates a meaningful cost difference. A reimbursement processed outside an accountable plan is not just an administrative inconvenience; it generates payroll tax liability on amounts the employer already spent. Expense policy automation can help consistently enforce submission requirements.

The De Minimis Rule

The IRS recognizes that some items of negligible value are impractical to document individually. Under the de minimis rule, employers can exclude small-value items from income without full substantiation, provided that accounting for them would be unreasonable or administratively impractical.

The IRS does not specify a precise dollar threshold for what qualifies as de minimis. Do not rely on a specific dollar figure mandated by the IRS. If an amount has been cited elsewhere as a threshold, treat it as illustrative rather than authoritative. For guidance on what qualifies under the de minimis rule, refer to IRS Publication 15-B and verify against the current edition before applying. For a broader discussion of how low-value benefits interact with employee expense reporting, see the Emburse guide to fringe benefits.

Are Expense Reimbursements Taxable?

For employees, the answer depends on whether the employer operates an accountable plan:

• Under an accountable plan, Reimbursements are not taxable income to the employee. They do not appear on the W-2 as wages and are not subject to withholding.
• Under a non-accountable plan: Reimbursements are treated as wages, included in W-2 income, and subject to income tax withholding.

For contractors, the tax treatment works differently and is covered in the next section.

One common point of confusion is the distinction between reimbursements and allowances. A flat car allowance paid monthly, regardless of actual miles driven,n is generally a non-accountable arrangement and is taxable income to the employee. A mileage reimbursement tied to documented actual business miles driven under an accountable plan is not taxable. The structure matters as much as the label.

Employee vs. Contractor Reimbursements

The reimbursement process for independent contractors differs from that for employees in three important ways.

No payroll tax withholding regardless of plan status. Because contractors are not employees, payments to them, including reimbursements, are not subject to the same employer payroll tax obligations. The accountable plan rules are specific to the employer-employee relationship.

1099-NEC reporting. Payments to contractors for services are generally reported on Form 1099-NEC. When contractor reimbursements are separately documented and invoiced for specific business costs, they are generally not considered compensation for services. They may not need to be included in reported income totals, but the treatment depends on how the arrangement is structured. Confirm the applicable rules with a tax advisor or the current IRS instructions for Form 1099-NEC before relying on this for reporting purposes.

Contract terms govern the process. Unlike employees, contractors typically negotiate reimbursement terms in their service agreements. Employers should specify in the contract which expenses are reimbursable, what documentation is required, and the submission timeline, rather than relying on an internal policy designed for employees. Organizations managing reimbursements across multiple countries or contractor arrangements may also need to consider global reimbursement processes.

How to Account for Reimbursable Expenses

From an accounting standpoint, reimbursed employee expenses are recorded as business expenses, not as compensation. The specific account used depends on the nature of the expenses: travel costs go to a travel expense account, meals to a meals and entertainment account, and so on. A consistent approach to travel and expense management reduces reconciliation time and supports cleaner audits.

The accounting workflow typically follows these steps:

1. Employee submits an expense report with receipts and documentation
2. The manager or the finance department reviews and approves the report
3. Approved expenses are coded to the appropriate expense accounts
4. Reimbursement is issued to the employee, separate from regular payroll or through payroll processing
5. Records are retained for tax and audit purposes

Record retention. Substantiation records supporting a business expense deduction should be retained for at least three years from the date the tax return was filed, or two years from the date the tax was paid, whichever is later. If income was understated by more than 25%, the IRS has six years to assess additional tax. Digital storage of receipts, expense reports, and approval records, indexed by employee, date, and expense category, reduces audit response time from days to minutes. Retention is not optional and should be treated as a finance operations requirement, not an afterthought.

Month-end close. Late expense submissions are one of the most common causes of close delays. When employees submit expenses weeks after the fact, the accruals required to capture those costs are either missed or estimated, creating reconciliation work after the books are closed. Setting and enforcing an internal submission window, shorter than the IRS 60-day safe harbor, directly improves close cycle accuracy. Finance teams that enforce a 30-day or even 15-day window report significantly cleaner month-end numbers.

Audit readiness. In an IRS audit of business expense deductions, substantiation records serve as evidence. Reimbursement without adequate documentation is indefensible, regardless of whether the underlying expense was legitimate. Finance teams should periodically audit a sample of approved expense reports—not just for policy compliance, but also to verify that the documentation would hold up to IRS scrutiny. Spot checks are more effective when done routinely than as a one-time cleanup before a scheduled audit.

Expense management software can automate much of this workflow, reduce manual review time, and create a clean audit trail. The documentation standards remain the same whether the process is manual or automated. If the company uses a corporate card rather than out-of-pocket reimbursements, the accounting entries differ the liability is to the card issuer rather than the employee. Credit card reconciliation tools can automate this process, reducing the month-end burden.

State Law Considerations

Federal law generally does not require employers to reimburse employees for expenses. The IRS accountable plan framework governs the tax treatment of voluntary reimbursements, but it does not mandate that employers make them.

However, some states impose mandatory reimbursement obligations by statute. State requirements vary significantly in scope and application; some apply broadly to all necessary business expenses, while others address specific cost categories such as remote work equipment or telecommunications. The requirements also differ in how they define a necessary expense, what documentation standards apply, and how quickly reimbursement must be made.

Some states have also addressed expense reimbursement obligations specifically for remote workers, though the rules vary by jurisdiction and continue to evolve.

What this means for employers:

• Operating only by federal rules may not be sufficient if you have employees in states with mandatory reimbursement requirements
• A policy that complies in one state may not comply in another
• State law, not the IRS, sets the consequences for non-compliance

This section intentionally does not cite specific statutes or name specific states, because the state law landscape in this area requires verified primary-source confirmation to state accurately. Before publishing or relying on this content, this section should be reviewed by a licensed employment attorney familiar with the laws of each state where you have employees. Consult your state's department of labor or an employment attorney for jurisdiction-specific guidance.

How to Build an Expense Reimbursement Policy

A written expense policy does three things: it tells employees what they can claim, it provides finance and managers with a consistent framework for approvals, and it establishes the documentation structure the IRS requires for accountable plan treatment.

A policy does not need to be long, but it needs to cover the right elements.

• Start with the scope. Define which employees and, if applicable, contractors the policy covers. If your organization has employees in multiple states, note that state-specific supplements may apply.
• Define eligible expenses. List the categories of expenses the company will reimburse. Be specific about exclusions. Ambiguity in this section is the primary driver of disputed claims.
• Set spending limits. Establish maximum amounts per category—nightly hotel rates, per-meal limits, and class-of-travel standards for airfare are the most common. The IRS does not require this, but it is standard practice for cost control.
• Specify documentation requirements. State what documentation is required for each category. Receipts, business purpose descriptions, attendee lists for meals, and mileage logs are typical. Be explicit about what happens when documentation is missing.
• Set submission timelines. Establish internal deadlines for expense submission that are equal to or shorter than the IRS 60-day safe harbor. Earlier is better for accounting close processes. Dedicated expense-tracking tools can automatically enforce submission windows.
• Define the approval workflow. Who reviews and approves expense reports? What is the escalation path for expenses above a certain threshold? Who has final authority for exceptions?
• Address advances and returns. If the company issues travel advances or corporate cards, specify the return process and timeline for excess amounts. This is required for compliance with the accountable plan.

Sample Policy Checklist

Use this checklist as a starting framework. Adapt it to your organization's structure and review it with legal or accounting counsel before finalizing.

• [ ] Policy applies to: [employees / contractors / specify roles]
• [ ] Eligible expense categories are listed with specific inclusions and exclusions
• [ ] Per-category spending limits are defined (hotel nightly cap, meal cap, airfare class)
• [ ] Required documentation is specified for each category
• [ ] Expense reports must be submitted within [X] days of incurring the expense (recommend no longer than 60 days to align with IRS safe harbor)
• [ ] Business purpose must be described on the expense report
• [ ] Receipts required for all expenses above $[X] (this threshold is a company policy decision; confirm with your tax advisor what documentation standard is appropriate for your accountable plan)
• [ ] Approval workflow is defined, including escalation path for high-value claims
• [ ] Process for advances and corporate card reconciliation is documented
• [ ] Process for returning excess advances is documented (recommend within 120 days to align with IRS safe harbor)
• [ ] Non-reimbursable items are listed explicitly
• [ ] Policy has been reviewed for compliance with applicable state law requirements
• [ ] Employees have acknowledged receipt of the policy in writing

Common Expense Reimbursement Mistakes to Avoid

Even well-intentioned programs create compliance exposure when key rules are misunderstood or inconsistently applied. Finance teams can use expense intelligence tools to surface patterns that indicate policy gaps before they become audit exposure. These are the mistakes that come up most often.

Treating the IRS safe harbors as hard deadlines

The 60-day and 120-day figures are IRS safe harbors under the "reasonable period of time" standard, not statutory deadlines. You should use them as internal benchmarks and set shorter windows, but framing them as hard cutoffs in employee communications is imprecise and potentially misleading.

Not having a written policy

Oral policies lead to inconsistent enforcement, disputed claims, and no documented structure. The IRS expects substantiation; your policy is the framework that enables it. A plan can fail the accountable plan test in practice even if the employer's written policy is technically compliant; if employees routinely submit late, documentation is accepted without review, or excess advances are never collected, the arrangement may be treated as non-accountable regardless of what the policy document says.

Mixing personal and business expenses without documentation

Gray area expenses are legitimate. But the business portion must be documented separately, not assumed. Blanket reimbursements for mixed-use items without documentation undermine accountable plan status.

Paying flat allowances and treating them as non-taxable

A flat car allowance or phone stipend paid regardless of actual expenses incurred is generally a non-accountable arrangement and is taxable income. If you want the allowance to be non-taxable, tie it to documented actual expenses.

Ignoring state law

Building a reimbursement process that satisfies only the federal IRS framework may not be enough if you have employees in states with mandatory reimbursement requirements. Review each state's requirements for where you have employees.

Reimbursing entertainment expenses at full value without current guidance

The deductibility rules for business entertainment changed significantly under federal tax law in 2018. Do not assume a historical practice is still compliant. Verify the current rules with a tax advisor before treating entertainment reimbursements as fully deductible.

Letting expense reports age

Accounts payable backlogs, manager approval delays, and year-end reconciliation crunches are common, but they push expense documentation further from the event date, increasing IRS audit risk and complicating the accounting close.