An invoice is an essential starting point for many expense reviews, but it may not explain what the business actually received. When an expense is questioned, connect the supplier's charge to the service or goods, the business purpose and the accounting treatment. The relevant tax conditions still need assessment. A convincing narrative cannot replace missing facts, and a payment alone does not settle deductibility.
Read the request carefully to identify the transactions and periods involved. Build a schedule showing invoice references, amounts, ledger entries and payments. Reconcile credit notes and partial settlements so the figures can be followed without guesswork. Where different taxes are involved, keep their tests separate: supporting an accounting expense does not automatically establish every indirect tax entitlement associated with the same purchase.
Gather the underlying agreement, orders, delivery evidence and correspondence showing the work performed. A consultancy charge might need a report, meeting records or other identifiable output. A goods purchase may need delivery and stock records. Use documents created through the transaction where possible, rather than producing retrospective descriptions that sound precise but cannot be connected to actual events or commercial decisions.
In a hypothetical marketing business, Hacienda asks about an external research invoice. The company supplies the engagement email, research output, project correspondence and evidence that the findings informed a client assignment. These records help explain the service and business connection. They do not guarantee acceptance: the legal treatment, timing and other applicable conditions still require review alongside the evidence presented.
Check for private use, connected suppliers, incomplete invoices or allocations across several activities. Explain any allocation method and preserve the basis used. Avoid presenting a broad statement such as business development as the entire justification. Equally, do not alter the supplier's original document to cure a perceived weakness. Discuss genuine corrections with the supplier and retain the history of any replacement document.
Organise the submission around the authority's questions, with a short factual explanation and an indexed set of attachments. Confirm that amounts agree with the return and books before filing. A focused expense evidence review can identify what is already supported, what needs clarification and how to present the transaction coherently without promising that a particular document will determine the outcome.