A calculator is only one step
Price calculations do not replace bookkeeping or filing software. Making Tax Digital requires digital records and compatible submission software unless an exemption applies. Check current HMRC guidance for the records and digital links relevant to your system.
Map the route from invoice to return
Write down where sales and purchase information first enters your workflow, how it is classified, how totals move between systems and how the return is submitted. This map helps identify manual copying and missing evidence before the filing deadline.
Test with a small sample
Follow one sales invoice, one purchase invoice and one adjustment all the way to the return report. Compare amounts, dates and tax codes at each stage. Investigate differences before assuming that a successful software connection means the numbers are correct.
Keep a clear boundary
Use these calculators for checking arithmetic and learning formulas. Keep your accounting records in your chosen system, and use compatible software for submission. No calculator on this site connects to your HMRC account or submits information on your behalf.
Keep learning
Official sources
Sources checked: 2026-09-26. Check the official guidance for later changes.
Educational information and estimates. These tools do not submit VAT returns or determine the treatment of a specific transaction.