Guide
How to write an expense report that gets approved
An expense report has one job: get you reimbursed without a round of follow-up questions. Most rejections are not about the spending — they are about the documentation. Write the report so an approver who knows nothing about your trip can say yes in two minutes.
What every expense report needs
- Who, when, where: your name, the reporting period, and the business purpose in one or two lines up top.
- Itemized expenses: date, vendor, amount, payment method, and category for every line. See our expense categories list for standard categories.
- Receipts attached to each line: not in a pile at the end — matched to the expense they prove.
- Business purpose per line: the "why" for anything non-obvious. "Dinner with client" is obvious; "Dinner, $180" is not.
- Totals and currency: subtotals by category, a grand total, and converted amounts for foreign spending.
- Policy flags: anything over a limit or outside policy, disclosed upfront with an explanation — not discovered by the approver.
Document as you go
The best expense report is written during the trip, not after it. Photograph every receipt the moment you get it — paper fades, gets lost, and goes through washing machines. Jot the business purpose on the photo or in a notes app while you still remember who was at the dinner. A week later, that $64 lunch receipt is a mystery; in the moment, it takes ten seconds to annotate. Many expense tracking methods make this nearly automatic.
The business-purpose sentence
This is the line that decides approvals. "Meal" gets questioned; "Working dinner with Acme Corp procurement team to finalize Q4 order" gets approved. The formula: what + who + business reason. For recurring internal costs (software, mileage), one clear purpose line covers the category. For client entertainment and travel, write it per expense — approvers and auditors both look here first. The categories you reference should match your bookkeeping setup — see our small business chart of accounts setup guide.
Common rejection reasons
| Rejection reason | How to prevent it |
|---|---|
| Missing receipt | Photograph receipts immediately; attach each to its line |
| No business purpose | Write what + who + why for every non-obvious expense |
| Wrong category | Use the company's category list, not your best guess |
| Personal items mixed in | Split shared bills; never bury personal spending |
| Over policy limits | Disclose and explain upfront, or get pre-approval |
| Late submission | Submit within the policy window — late reports get extra scrutiny |
| Math errors | Let the template total; double-check foreign currency conversions |
Foreign currency and conversions
Record the original amount and currency for every foreign expense, then the converted total using the rate from the transaction date (your card statement's rate is the safest source). Note the rate you used. Approvers cannot verify a converted total without the original — and auditors definitely will ask.
Submitting like a professional
Submit on time, in the company's template, with everything attached. Add a one-line summary at the top: total, period, and anything unusual. If you are over a limit or claiming something odd, explain it before the approver has to ask — a flagged-and-explained exception gets approved faster than a discovered one. And keep a copy: save the submitted report and receipts for at least the tax-retention period in your jurisdiction. The report's title matters too — see our guide on expense report titling systems for naming conventions that keep archives searchable.
Key takeaway: approvers say yes to reports they can verify in two minutes. Itemize everything, attach every receipt, explain the why — and disclose exceptions before they are discovered.
Per diems vs actual expenses
Some companies skip line-by-line reporting for travel meals and incidentals, paying a fixed daily allowance (per diem) instead. If your company uses per diems, do not report actual meal receipts for those days — claiming both is double-dipping and a classic audit flag. Know which expenses fall under the per diem (usually meals and incidentals) and which still need actuals (lodging, airfare, client entertainment). When in doubt, ask finance before the trip, not after — the answer determines how you document everything.
FAQ
What if I lost a receipt?
Submit a signed lost-receipt declaration with the date, vendor, amount, and business purpose. Most policies allow this occasionally — but "occasionally" is the operative word.
How detailed should the business purpose be?
One sentence with what, who, and why. Enough that a stranger — or an auditor in two years — understands the business reason.
Can I combine multiple trips in one report?
Only if your policy allows it. Separate reports per trip are cleaner and get approved faster, because the approver can verify one story at a time.
Should I report expenses below the receipt threshold?
Yes — report everything, receipt or not. Thresholds waive the receipt requirement, not the reporting requirement.
How long should I keep expense records?
At least as long as your tax authority requires (often several years). Digital copies are fine in most jurisdictions — check your local rules.