A reliable return starts with consistent recording throughout the period. Scattered invoices and inconsistent branch treatment cannot be fixed simply by checking the tax total on the last day. Build a working file in which each figure can be traced to a ledger and document.
Where do errors typically arise?
- Recording a transaction in the wrong period without checking its treatment.
- Duplicating an invoice or omitting a credit or debit note.
- Combining branch reports without resolving duplication and differences.
- Assuming every tax amount on a purchase invoice is deductible without checking conditions.
- Manually changing the return working file without a corresponding audit trail in the books.
A practical pre-filing review
Reconcile sales and purchase totals to the general ledger, then investigate exceptions: large amounts, unusual changes and missing evidence. Record the reason for each difference, its resolution and who approved it.
If an error is found after filing
The authority provides a service to amend a previously filed return, with reasons, supporting documents and revised financial information. Confirm the appropriate procedure and retain submission evidence. Do not assume that an amendment automatically removes regulatory consequences.
Prof Accountant helps organise return working papers and reconciliations and identify exceptions requiring specialist review, within an agreed scope and responsibilities.
Official sources
Sources reviewed: 2026-11-03. Apply requirements according to the entity’s circumstances and the rules in force when action is taken.