Identify the period required by the file
Start with the customs, VAT, tax, accounting, or professional instruction that governs the calculation. Record the HMRC month or period required by that instruction instead of treating every tax file as the same workflow.
Match the period to the supported HMRC dataset
HMRC publishes monthly exchange rates for customs-value work and identifies when each monthly set applies. Select the supported dataset and date or period that match the file, then confirm that the proof bundle is ready.
Keep the proof with the calculation
Attach the signed proof PDF to the schedule, declaration, workpaper, or accounting record that used the rate. Keep the filing context and the reason for choosing the period in the business file.
The proof adds a consistent source and period record, digital signature, document id, payload hash, and public verification path. It does not replace the underlying filing or professional conclusion.
Separate evidence from advice
HMRC remains the source of the rate data. FXProof is not affiliated with or endorsed by HMRC and does not decide whether the selected rate or period is correct for a particular filing.
HMRC source and period
Review the supported HMRC source, date or period semantics, readiness, and non-affiliation note.
Open HMRC source pageSee the document
Inspect the static HMRC proof sample and the verification fields passed to a reviewer.
View HMRC proof sampleTax file workflow
See how to keep exchange-rate evidence with a tax schedule or workpaper without treating it as tax advice.
Open tax use caseCustoms and VAT workflow
See where source, period, proof, and filing context fit in a customs or VAT file.
Open customs and VAT use caseQuestions
Does this guide say which HMRC month I must use?
No. Follow the instruction or professional advice governing the file. FXProof documents the supported HMRC dataset and period you selected.
Is the FXProof PDF issued by HMRC?
No. HMRC publishes the underlying exchange-rate data. FXProof independently issues and signs the source-attributed proof PDF.
Can the proof replace a customs, VAT, or tax workpaper?
No. Keep the proof with the workpaper or declaration that explains the calculation and filing context.