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Claiming GST on business expenses: receipts and records
A GST-registered business in Singapore can claim back the GST it pays on business purchases as input tax, if the claim is supported by the right documents. Most problems at review are record-keeping problems: faded receipts, no supplier GST number, no business purpose, the same receipt counted twice. This guide covers the record-keeping side.
Written by Kyn Technology Pte Ltd (UEN 202622080C), which builds expense and receipt software. This is not tax advice. IRAS sets the rules on what is claimable and what documents are required, and those rules change. Check IRAS guidance, or ask your tax agent, before relying on any point here.
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Input tax basics
GST charged by a GST-registered supplier on a purchase is input tax to the buyer. A GST-registered buyer can claim it in the GST return, subject to IRAS conditions. Three points hold in every case:
- The business making the claim must be GST-registered.
- The purchase must be for the business.
- The claim must be supported by valid documents, normally a tax invoice.
Everything beyond that, including which expense types are excluded, how to treat mixed business and personal use, imported services, and the exact fields a tax invoice must show, is set by IRAS. This guide points to where those rules apply rather than restating them.
Nine record-keeping steps
1. Confirm the business is GST-registered
Only a GST-registered business can claim input tax. If the business is not registered, GST paid on purchases is part of the cost and cannot be claimed back. Check the registration date too: purchases made before registration follow separate rules, set out by IRAS.
2. Get the right document at the point of purchase
Input tax claims need supporting documents, normally a valid tax invoice, or in some cases a simplified tax invoice or receipt. A card slip or a bank statement line on its own is generally not enough. When paying, ask for the tax invoice. Check IRAS guidance for which document is required in which situation.
3. Check the receipt shows the supplier’s GST details
A tax invoice from a GST-registered supplier shows the supplier’s GST registration number and the GST charged, along with other details IRAS specifies. If a receipt has no GST registration number, the supplier may not be registered, and there may be no GST to claim. Do not estimate GST from the total.
4. Record the business purpose
Input tax is claimable on purchases made for the business. Note the purpose on every expense: client, project or reason. Where a purchase is partly personal, the business share needs to be worked out. IRAS also lists expense types where input tax cannot be claimed. Check IRAS guidance before claiming on vehicles, entertainment, staff benefits or anything with a personal element.
5. Keep the image with the record
Store the receipt image, or the original PDF invoice, attached to the expense record. Thermal paper fades. A clear photo taken on the day is the record you will rely on if IRAS asks.
6. Record GST separately from the cost
Record each expense as the amount before GST plus the GST amount. Cost reporting then reflects what the business actually bears, and the GST total for the period can be checked against the receipts behind it.
7. Treat foreign-currency purchases consistently
Overseas suppliers usually do not charge Singapore GST, and imported services and goods have their own rules. For your books, convert foreign amounts to SGD on a consistent basis and keep the source of the rate. Check IRAS guidance on the exchange rates acceptable for GST purposes.
8. Remove duplicates before the period closes
The same purchase often appears twice: a card slip and an itemised receipt, or a photo uploaded by two people. Review likely duplicates before preparing the return. A claim counted twice is an error, whatever the cause.
9. Review the period and keep the records
Before each GST return, review the period’s expenses: missing documents, missing supplier GST numbers, unclear purpose, duplicates. Keep the records for the period IRAS requires; IRAS sets record-keeping periods for businesses, so confirm the current requirement on the IRAS website.
Receipt checklist
Check each receipt or invoice for:
- Supplier name.
- Supplier GST registration number.
- Date of the invoice or receipt.
- Description of what was bought.
- Total amount, and the GST amount or a statement that GST is included.
- Your business name, where IRAS requires it for the document type.
- A legible image stored with the expense record.
- A note of the business purpose.
This list is a practical check, not the legal definition of a tax invoice. Confirm the required fields against IRAS guidance for full and simplified tax invoices.
What software can and cannot do
Can
- Read merchant, date, total and GST from a receipt photo. In one Singapore expense product KYN built, 30 receipts were read in 17 seconds.
- Flag receipts with no supplier GST registration number.
- Hold likely duplicates for review; the same product accepts bulk uploads of up to 100 receipts.
- Convert foreign-currency receipts to SGD at the charge-date rate.
- Show expenses before GST, with GST held separately, on a tax review screen, and export CSV for the accountant.
Cannot
- Decide whether an expense is claimable. That depends on IRAS rules and the facts of the purchase.
- Judge business purpose. A person records it.
- File the GST return. That stays with the business or its tax agent.
See expense, receipt and GST automation for how KYN builds this, and bank reconciliation automation for matching expenses to bank lines.
Official sources
The Inland Revenue Authority of Singapore publishes the rules on GST registration, input tax claims, tax invoices, disallowed expenses and record keeping at iras.gov.sg. Where this guide and IRAS differ, IRAS is correct.
Frequently asked questions
Can a business that is not GST-registered claim GST on expenses?
No. Only GST-registered businesses can claim input tax. For an unregistered business, GST paid is part of the cost of the purchase.
Is a credit card slip enough to claim GST?
Generally no. Input tax claims are supported by a tax invoice or, in some cases, a simplified tax invoice or receipt. A card slip usually lacks the supplier GST details. Check IRAS guidance for the document required in your case.
What if the receipt has no GST registration number?
The supplier may not be GST-registered, in which case no GST was charged and there is nothing to claim. Do not estimate GST from the total. Ask the supplier for a tax invoice if you believe GST was charged.
Can I claim GST on purchases that are partly personal?
Only the business portion can be considered, and some expense types are excluded entirely. IRAS sets these rules. Check IRAS guidance or ask your tax agent.
How long do I need to keep receipts?
IRAS sets a record-keeping period for businesses. Confirm the current requirement on the IRAS website, and keep clear images, since thermal receipts fade.
Does receipt-scanning software make my claims compliant?
No. It makes records complete and easy to review. Whether each claim is valid depends on IRAS rules and the facts, decided by you or your tax agent.