If your accounts convert a supplier’s foreign-currency invoice at a different rate from the invoice’s GST conversion, do not automatically claim the GST amount generated by your ledger. Check the Singapore-dollar tax amount on the valid supplier tax invoice and the input-tax conditions. The accounting entry and GST claim need a clear reconciliation, even where both systems are working as configured.
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Start with the supplier’s tax invoice
IRAS’s foreign-currency guidance says the supplier must state the GST payable in Singapore dollars using its chosen approved exchange-rate source. The customer uses that stated Singapore-dollar GST for its claim, rather than a differently converted amount in its books.
Check the supplier, customer entity, relevant supply and invoice details. A currency difference does not cure another defect in the claim.
Example: two systems produce different tax figures
The supplier states S$123 of GST. Your software’s exchange rate produces S$125. Subject to the claim conditions, do not increase the claim by S$2 solely because the ledger used a different rate. Preserve the invoice and explain the system difference.
Prepare an invoice-to-return bridge
- Original currency, invoice value and date.
- Singapore-dollar GST shown by the supplier.
- Exchange rate and amount used in the ledger.
- Input GST included in the proposed return.
- Any adjustment, credit note or disputed invoice.
Separate tax coding from foreign-exchange and rounding entries. Avoid changing the full expense or payable simply to force the tax control account to match.
What if the invoice omits the Singapore-dollar amount?
Ask the supplier for a properly reviewed correction and have the tax adviser assess the claim. Do not amend the supplier’s original document yourself or invent an exchange-rate note on its behalf.
Imports require their own evidence: IRAS refers to Singapore-dollar amounts on the Customs import permit. Do not substitute a foreign supplier’s commercial invoice for the required import evidence.
Review the return and retain the explanation
Reconcile the final purchase listing to valid documents and the submitted GST return. If an earlier return used the wrong figure, assess the appropriate correction process separately.
Record the cause and control change so the same software setting does not create repeated differences next quarter.
Can the ledger’s rate always determine the GST claim?
No. Check the supplier’s stated Singapore-dollar GST and the applicable conditions.
Should staff edit the supplier’s PDF?
No. Obtain a proper correction where required and preserve the original.
Related guidance
checking the supplier before a GST claim; GST on recovered expenses; supplier credit notes after year end.
Get help with your records and next steps
Our accounting team and tax advisers can help reconcile foreign-currency invoices and review GST reporting. Email [email protected] or WhatsApp +65 8501 7133. Where legal advice is needed, RCS can coordinate assistance through advisers from associated law firms.