Definition
A tax invoice is a formal invoice issued by a GST or VAT registered supplier that contains the specific information the tax authority requires to support an input tax credit claim by the customer. It is distinct from a simple receipt, a sales invoice, or a credit card statement. Each tax authority sets out the mandatory fields and the thresholds at which simplified versions become acceptable.
What a tax invoice means in practice
For a bookkeeper, the tax invoice is the foundation of every input tax claim. Without one, the VAT or GST reclaim is at risk on audit. The most common compliance failure pattern is identical across jurisdictions: the supplier provided a till receipt or a credit card slip rather than a proper tax invoice, the bookkeeper claimed the input tax anyway, the audit later disallows it.
The two-job workflow is straightforward. At capture time, confirm the document carries the mandatory fields for your jurisdiction. If it does not, request a proper tax invoice from the supplier before claiming the input tax. Most receipt-capture tools surface a “missing tax invoice” flag that highlights these at the point of capture, when fixing them is cheap.
A practical example: an Australian SMB pays AUD 1,200 to a marketing agency. The agency emails a PDF with the words “Tax Invoice” prominent, the agency’s ABN, the date, a brief description, the GST amount (AUD 109.09), and the total. Because the sale is above AUD 1,000, the buyer’s identity is also required: this invoice shows the SMB’s business name. The bookkeeper captures it, codes the GST, and claims the AUD 109.09 input tax credit on the next BAS.
How tax invoices work by country
Australia
The ATO requires tax invoices to carry seven specific details for sales under AUD 1,000 and eight for sales above. The “Tax Invoice” label must be prominent. The supplier’s ABN is mandatory. For sales of AUD 82.50 or less, a regular receipt is sufficient (no tax invoice needed) but the supplier must provide one within 28 days if requested. Peppol-network eInvoices satisfy the rule without the literal “Tax Invoice” label.
United Kingdom
HMRC operates three invoice tiers. Simplified VAT invoice covers totals up to 250 inclusive of VAT and requires only the supplier details, supply date, description, total, VAT rate, and VAT registration number. Modified VAT invoice is the retailer variant above 250 showing VAT-inclusive amounts per line. Full VAT invoice is the default above 250 and adds the buyer’s name and address, sequential invoice number, separate VAT amount, and supply quantity per line. The full requirements are in VAT Notice 700/21.
New Zealand
The April 2023 GST reforms renamed “tax invoice” to “taxable supply information,” and removed the legal requirement for the words “Tax Invoice” to appear on the document. Old “Tax Invoice” documents continue to comply. Three thresholds apply: under NZD 200 (till receipt is sufficient), NZD 200-1,000 (intermediate fields), above NZD 1,000 (full fields including buyer details).
Canada
The CRA operates three tiers under the Input Tax Credit Information Regulations. Tier 1 (under CAD 100): supplier name, date, total. Tier 2 (CAD 100-499.99): adds supplier GST/HST registration number, GST/HST amount, status indication for mixed supplies. Tier 3 (CAD 500+): adds buyer name, description of goods/services, payment terms. The CRA’s “no receipt no deduction” rule means lost or illegible documentation kills the input tax credit; credit card statements alone never qualify.
Singapore
IRAS section 7.1.4 mandates the words “Tax Invoice” prominently, the supplier’s name and address and GST registration number (format M2-1234567-K), the customer’s name and address, a description, quantity, amount excluding GST, the GST rate, the GST amount as a separate line, and the total including GST. Cash discounts and breakdowns of exempt or zero-rated supplies must also be shown separately where they apply.
Related terms
The tax invoice is the foundation document for input tax recovery across the regimes:
- VAT, GST, and HST are the three indirect-tax regimes a tax invoice supports.
- Input VAT and input tax credit are the amounts you reclaim on the back of the tax invoice.
- A plain invoice lacks the mandatory tax fields and cannot support an input tax claim.
- A proforma invoice is a quote-stage document with no tax-recovery force.
See also
For the jurisdiction-specific lifecycle (registration, returns, MTD, calculator), see the UK VAT and MTD guide, the AU GST and BAS guide, the CA GST and HST guide, or the SG GST guide.
FAQ
See the answered questions above for tax-invoice vs invoice, supplier-refusal scenarios, and why card statements do not qualify.