What Should an Expense Reimbursement Form Include?

An expense reimbursement form looks like simple paperwork, but it's quietly doing two jobs. It gets your team paid back for what they spent, and it creates the record that keeps those payments tax-free for everyone. Skip the form, or build it wrong, and reimbursements can turn into taxable wages, an expensive surprise for a routine task.

This guide covers what belongs on the form, the reimbursement process, the accountable-plan rules that make reimbursements tax-free, and how to record it all correctly in your books.

Key takeaways

• An expense reimbursement form collects the details needed to repay a business expense.
• The form is also the substantiation that an IRS accountable plan requires.
• Under an accountable plan, reimbursements aren't taxable income to the employee or subject to payroll tax.
• Without an accountable plan, reimbursements are treated as taxable wages.
• Every reimbursement should be recorded in the correct expense category, not lumped together.

What an expense reimbursement form is

An expense reimbursement form is the document an employee, or owner, submits to be paid back for a business expense they covered personally. It captures what was spent, why, and the proof, then routes it for approval and payment.

On the surface it's an administrative tool. Underneath, it's a compliance document. The IRS treats reimbursements as taxable income unless the business runs a proper accountable plan, and the form is how you meet that plan's substantiation requirement. Good paperwork here is the difference between a tax-free reimbursement and a taxable one.

That's why the form matters more than it looks. It's not just about getting the number right; it's about proving the expense was legitimate and business-related.

What to include on the form

A useful reimbursement form captures everything needed to approve, pay, and substantiate the expense. Here are the fields to include.

The business purpose and receipts are the fields that carry the compliance weight. A form that lists amounts without explaining why each was a business expense, or without receipts, doesn't satisfy the substantiation an accountable plan needs.

The reimbursement process

A form is only as good as the process around it. A clear, consistent flow keeps reimbursements fast, fair, and compliant.

1. Employee incurs the expense. They pay for a legitimate business cost out of pocket and keep the receipt.
2. Submit the form. The employee completes the reimbursement form, itemises the expenses, states the business purpose, and attaches receipts.
3. Review and approve. A manager checks the expenses against policy and confirms documentation before approving.
4. Reimburse. The business pays the employee, ideally as a separate payment clearly marked as a reimbursement, not mixed into wages.
5. Record it. The bookkeeper posts each expense to the correct category, so the reimbursement lands in the books accurately.

Setting a submission deadline, such as within 30 or 60 days, keeps this from turning into a year-end pile of stale receipts.

Accountable vs non-accountable plans: the tax rule

This is the part that turns a form into real money. Whether reimbursements are tax-free depends entirely on whether your business runs an accountable plan, as defined by IRS Publication 463.

An accountable plan must meet three requirements. The expense must have a business connection, meaning it's a legitimate deductible business cost incurred for the employer. The employee must adequately substantiate it within a reasonable time, which is exactly what the reimbursement form and receipts do. And the employee must return any excess advance within a reasonable time.

Meet all three, and the reimbursement isn't taxable income to the employee and isn't subject to payroll tax for either side. Fail them, and you have a non-accountable plan, where reimbursements are treated as taxable wages, reported on the W-2, and subject to payroll taxes.

Since the 2017 tax law removed most employees' ability to deduct unreimbursed business expenses, an accountable plan matters more than ever.

How to record reimbursements in your books

Recording matters as much as paying. A reimbursement isn't a lump of "miscellaneous" spending; it's a set of real business expenses that happened to be paid personally first.

When you record the reimbursement, break it into its actual categories: mileage, meals, and supplies, so each cost lands where it belongs on your profit and loss.

This keeps your business expense categories accurate and preserves the deductions. Tools like Finlens keep that categorisation consistent as reimbursements are recorded, so the deductions hold up.

Treat the reimbursement itself as what it is: repaying the employee, recorded through your accounts payable process or a direct payment, not as additional wages. Small out-of-pocket reimbursements sometimes overlap with petty cash, so decide which system handles what.

Best practices

A few habits keep reimbursements clean and compliant. Put your accountable plan in writing and make it available to everyone, so the rules are clear and consistently applied.

Require receipts and a business purpose for every expense, set a submission deadline, and pay reimbursements separately from payroll so they're never confused with wages. Define approval thresholds: routine expenses approved by a manager, larger ones by a department head, so oversight scales with the amount.

Finally, keep the documentation. The IRS scrutinises reimbursement substantiation, so retained forms and receipts are your protection if anyone ever asks. Clean records also make the reimbursed expenses easy to verify against your deductible expenses at tax time.

Conclusion

An expense reimbursement form is a small document with an outsized job. It gets your people paid back, and, just as importantly, it's the substantiation that keeps those reimbursements tax-free under an accountable plan.

Build the form to capture the business purpose, itemised amounts, and receipts; run a clear submit-approve-pay-record process; and put your accountable plan in writing. Meet the IRS's three requirements and everyone comes out ahead: the employee isn't taxed on being paid back, and the business keeps the deduction without extra payroll tax.

Then record each reimbursement to its real expense categories rather than a catch-all line. Do that, and reimbursements stay a routine, compliant part of running the business instead of a tax problem hiding in your books.

Frequently asked questions

What should an expense reimbursement form include?

It should capture the employee's name, the date of each expense and of submission, the business purpose, itemised expenses with categories and amounts, attached receipts, the total to be reimbursed, and an approval signature. The business purpose and receipts are essential, since they provide the substantiation an accountable plan requires.

Are expense reimbursements taxable?

It depends on your plan. Under an IRS accountable plan, reimbursements aren't taxable income to the employee and aren't subject to payroll tax. Under a non-accountable plan, they're treated as taxable wages, reported on the W-2 and subject to payroll taxes. The form and substantiation are what make a plan accountable.

What is an accountable plan?

An accountable plan is a reimbursement arrangement that meets three IRS requirements: the expense has a business connection, the employee substantiates it within a reasonable time, and any excess advance is returned within a reasonable time. Meeting all three keeps reimbursements tax-free for both the employee and the business.

What is the difference between an accountable and non-accountable plan?

An accountable plan meets the IRS substantiation and business-connection rules, so reimbursements are tax-free. A non-accountable plan doesn't, so reimbursements are treated as taxable wages, added to the employee's W-2 and subject to payroll taxes. The difference is documentation: receipts, business purpose, and timely reporting.

Do I need receipts for expense reimbursements?

Yes, in almost all cases. Receipts are part of the substantiation an accountable plan requires, and without them a reimbursement may be treated as taxable income. The IRS generally requires documentation for expenses, with specific rules for items like lodging, so require a receipt for every line on the form.

How do I record an expense reimbursement in accounting?

Record each reimbursed cost to its actual expense category, such as travel, meals, or supplies, so your profit and loss stays accurate and the deductions are preserved. Treat the payment to the employee as repaying them, not as wages. Avoid lumping reimbursements into a single miscellaneous line.

How quickly should employees submit expenses for reimbursement?

Set a clear deadline, commonly within 30 to 60 days of the expense. The IRS requires substantiation within a reasonable time for an accountable plan, and a defined window keeps receipts current, prevents a year-end backlog, and makes reimbursements easier to review and record accurately.

Can business owners reimburse themselves through an accountable plan?

Yes. Owners and shareholders who are also employees can be reimbursed under an accountable plan, including for costs like a home office, as long as the same rules are met: business connection, substantiation, and return of excess advances. This is a common, tax-efficient way for owners to recover business costs paid personally.