An expense report is the document an employee submits to account for business expenses, either to be reimbursed for money they paid themselves or to justify charges on a company card. Each line usually has a date, merchant, category, amount and business purpose, with the receipt attached and a project or cost center to charge.
A typical flow: the employee submits, the manager approves the business purpose, finance checks receipts against the policy, and the reimbursement goes out by payroll or ACH.
Why it matters
The expense report is what connects a card swipe or a receipt to a business reason. It is also how an employer shows that reimbursements meet the IRS accountable plan rules, which keep them out of taxable wages.
Example
Priya attends a trade show in Chicago (illustrative): $412 for the hotel, $86 for meals and $45 for rideshares, $543 in total. Her manager confirms the trip was approved, finance checks the hotel receipt against the lodging policy, and she is reimbursed by ACH. Mileage is usually paid at a per-mile rate; if you use the IRS standard mileage rate, check the current figure.
Common pitfalls
- Missing or unreadable receipts, accepted "just this once".
- Duplicates. The same receipt submitted twice, or a card charge also claimed as out of pocket.
- Rubber-stamp approvals. Managers approve without opening the lines.
- Late submissions. Reports filed months later can fall outside the accountable plan's reasonable period.
- Personal items mixed in with business ones.
This is general information, not tax advice.