US guide · Updated November 2026
Accountable plans: US expense reimbursement rules and records
An accountable plan is an employer's reimbursement arrangement that meets IRS requirements for business expenses, supporting records and the return of excess payments. Qualifying reimbursements are excluded from employees' wages for federal tax purposes. The arrangement has to work in practice: calling a payment a reimbursement, or approving a report, is not enough on its own.
What are the three accountable-plan requirements?
| Requirement | What it means |
|---|---|
| Business connection | The expense is an allowable business expense incurred while performing services as an employee. |
| Substantiation | The employee provides sufficient details and supporting evidence within a reasonable period. |
| Return of excess payments | The employee returns any amount above the substantiated expenses within a reasonable period. |
Qualifying payments are not subject to federal income-tax withholding, or to Social Security, Medicare and federal unemployment taxes. Payments under a nonaccountable arrangement are generally treated as wages.
Have your accountant review your arrangement and payroll treatment, including any state tax requirements that apply.
An expense policy and an accountable plan serve different purposes
Your expense policy explains what employees may spend, what needs approval and how to submit a report. An accountable plan concerns the federal tax treatment of the reimbursement arrangement. A policy can support that arrangement, but spending limits and manager approval do not replace the requirements to substantiate expenses and return excess payments.
For example, "hotels require manager approval" is a spending rule. "Employees must document the trip and return unused advances" addresses a different responsibility. Review both together so employees get one consistent set of instructions.
What do the 30, 60 and 120 days mean?
The IRS regulations provide timing safe harbors: periods that are treated as reasonable when their conditions are met.
| Action | Fixed-date safe harbor |
|---|---|
| Provide an advance | No more than 30 days before the expense is paid or incurred |
| Substantiate the expense | Within 60 days after it is paid or incurred |
| Return an excess amount | Within 120 days after the expense is paid or incurred |
These periods are measured from the expense, not from the manager's approval date or the payroll date. They are safe harbors, not the only reasonable periods; circumstances can matter.
An alternative is the periodic statement method: the employer sends statements at least quarterly, and the employee substantiates or returns outstanding amounts within 120 days of the statement.
These are not employer payment deadlines. Set your reimbursement schedule separately, taking account of the employment obligations that apply, and tell employees both their submission deadline and when the business expects to pay.
What records should employees provide?
- The date and amount.
- The merchant or destination.
- What was purchased.
- The business purpose.
- Receipts or other supporting evidence where required.
- Travel details, business mileage or the business relationship, depending on the expense.
Record the details promptly. A receipt can establish the purchase but may not explain its business purpose, and a payment statement alone may not be enough.
For internal review, also identify the employee, the project or cost center, and whether the employee or the company paid. That helps finance code the expense and avoid reimbursing a company-paid purchase.
How should you handle an unused advance?
Consider an employee who receives a $600 advance for a business trip and submits $520 of supported expenses. Under an actual-expense arrangement, finance reconciles:
| Record | Amount |
|---|---|
| Advance paid | $600 |
| Supported expenses | $520 |
| Amount to return | $80 |
Record the return of the $80 and link it to the advance and the expense report. Do not close the advance just because the manager approved the trip expenses.
This is an illustrative actual-expense example. Mileage and per diem arrangements can have different substantiation and excess-payment rules.
What happens when the requirements are not met?
If an employee does not substantiate a paid amount or return an excess within a reasonable period, the affected amount generally becomes subject to employment taxes. The regulations specify the payroll timing for that treatment.
A failure by one employee does not automatically make every other employee's reimbursements taxable. An arrangement that does not require substantiation or the return of excess amounts is a broader problem.
Give finance and payroll a documented escalation process. Outstanding items should have an owner, a follow-up date and a recorded decision, not sit indefinitely as "awaiting receipts".
Can we use a fixed allowance instead?
A fixed payment should not automatically be treated as a tax-free reimbursement. Ask your accountant to distinguish a flat allowance from a qualifying mileage or per diem arrangement.
Also avoid replacing salary with a payment labeled "reimbursement". IRS Revenue Ruling 2012-25 addresses arrangements that recharacterize wages as expense payments, including where employees receive substantially the same pay whatever their business expenses.
For any allowance arrangement, document:
- What costs it covers.
- How the amount is calculated.
- What the employee must substantiate.
- How unused or excess amounts are handled.
- How payroll treats amounts that do not qualify.
Put the arrangement into a practical written policy
Federal accountable-plan treatment does not depend on having a document titled "Accountable Plan", and IRS guidance describes an arrangement that is not necessarily written. A written policy is still the best way to apply the requirements consistently. Have your adviser review one that covers:
Covered expenses
Eligible business costs, and the personal spending that is excluded.
Supporting records
Required details, receipts and expense-specific evidence.
Submission timing
Employee deadlines, and how late reports are reviewed.
Advances
Who approves them, and who tracks outstanding balances.
Excess amounts
How and when employees must return them.
Missing documents
Replacement requests, alternative evidence and review.
Payroll treatment
Who decides when an amount needs taxable treatment.
Responsibilities
What employees, managers, finance and payroll each do.
Review the policy when your workforce, payment methods or expense arrangements change.
Common mistakes
- Treating approval as tax substantiation. A manager may confirm a trip happened without checking that the records are complete. Make the manager's review and finance's review explicit.
- Letting advances disappear into expense reports. Track the original advance, the supported expenses and any balance returned.
- Applying the timing rules from the wrong date. Keep the expense date visible to reviewers. A late approval should not silently reset the employee's documentation timeline.
- Using "reimbursement" as a payroll label without review. The label should reflect the treatment your accountant approved. It does not establish eligibility by itself.
- Treating software as the accountable plan. Software can collect records, flag missing information and keep approvals. Your business still has to operate the arrangement and resolve exceptions.
How Reimgo supports the supporting records
Capture receipts while the details are fresh
Employees send receipts on WhatsApp, forward them by email or capture them in the app. Reimgo creates a draft, with the expense date kept, for the employee to check.
Keep the purpose with the expense
Employees add a description, category and project or cost center. Your policies can require a note, require a receipt above an amount, and flag late submissions.
Review with the evidence attached
Approvers and finance see the expenses and receipts together. The report history records each decision and note.
Mileage at the IRS standard rate
Employees enter the business miles and Reimgo applies the IRS standard mileage rate for the date of the trip.
Link reports to reimbursement records
Finance prepares batches of approved reports. After payment through payroll or the bank, finance records the payment details in Reimgo.
Export records for your accountant
Download expense lines and reports as CSV or Excel, and report PDFs with the receipts attached.
Reimgo does not track cash advances or returned excess amounts today, so record those in your accounting or payroll system. Your finance team and accountant remain responsible for the tax treatment and for operating the arrangement. Using Reimgo does not make an arrangement an accountable plan.
Questions about accountable plans
What is an accountable plan?
A reimbursement arrangement that meets three IRS requirements: a business connection, substantiation of expenses within a reasonable period, and return of excess payments within a reasonable period. Qualifying reimbursements are excluded from employees' wages for federal tax purposes.
Is an accountable plan the same as an expense policy?
No. An expense policy explains the company's spending and submission rules. An accountable plan is a reimbursement arrangement that meets the IRS requirements. The policy can document how the arrangement operates.
Does the IRS require a written accountable plan?
A written plan is not, by itself, a federal qualification requirement. Documenting the arrangement is still useful, and employment or other rules may make written policies important. Have your adviser check what applies to your business.
Does every expense require a receipt?
Not necessarily. IRS Publication 463 has documentary-evidence exceptions, including certain expenses below $75 other than lodging, and transportation where a receipt is not readily available. The expense still has to be substantiated, and your company may require more documentation.
Can reimbursements be paid through payroll?
Yes. The payment channel does not decide the tax treatment. Identify reimbursement amounts separately when a payment also includes wages.
Does the 60-day rule mean we can wait 60 days to reimburse employees?
No. It is a safe harbor for substantiation, not permission to delay payment. Use the reimbursement schedule and employment requirements that apply to your employees.
Can Reimgo decide whether a reimbursement qualifies?
No. Reimgo organizes the expense records and the reimbursement workflow. Your accountant determines the tax treatment, and your business must operate the arrangement accordingly.
Sources and review date
- IRS Publication 15, Employer's Tax Guide: accountable and nonaccountable reimbursement arrangements.
- IRS Publication 463, Travel, Gift, and Car Expenses: substantiation and supporting records.
- Treasury Regulation 1.62-2: requirements, timing safe harbors and employment-tax treatment.
- IRS Publication 5137, Fringe Benefit Guide: accountable arrangements explained.
- IRS Revenue Ruling 2012-25: recharacterizing wages as reimbursements.
Sources checked: 10 November 2026. Rules change, and this guide summarises them in plain words. Check the official text before you rely on any point.
This guide gives general information about federal reimbursement tax rules, not tax or legal advice. Have a qualified adviser review your arrangement and any state requirements that apply.
Keep the evidence with every expense
Capture receipts, collect the business purpose and keep approvals with the report your finance team reviews.