FAQ · Updated October 2026
What is a substantiated business expense?
A substantiated business expense is one you can prove: what it was, how much, when, where and why it was for the business. The word comes from US tax rules; here is what it means in practice, without the jargon.
The plain meaning
A substantiated expense is one you can prove: what it was, how much, when, where and why it was for the business. In the US, how reimbursements are treated for tax depends partly on whether they were substantiated and paid under a process the IRS calls an accountable plan. The general idea is simple: a business reason, evidence such as a receipt, a reasonable time to submit, and the return of any amount paid over the actual cost.
The details, including what counts as a reasonable time and which expenses need which evidence, are for your CPA. The process that gets you there is not complicated.
The elements a record usually needs
- Amount. The receipt total, with tax and tip shown where they apply.
- Date and place. When and where it happened.
- Business purpose. A sentence. For meals, who attended and the relationship.
- Evidence. A receipt, or for small amounts a note where your policy allows it.
- Timing. Submitted within the window your policy sets, and paid after approval.
How a process keeps you there
Capture creates the record
A receipt photographed at the counter with the amount, date and merchant read from it is most of the evidence.
A note where it matters
A description-required rule for client meals makes the purpose and attendees part of the record.
A deadline
A submission-window rule enforces "reasonable time" without anyone remembering to check.
Approval before payment
An approver confirms the business purpose; finance pays only approved reports.
This page is general information about running expenses in a business. It is not tax, legal or accounting advice. Check your own obligations with a qualified adviser.
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