Usually, the supplier remains responsible for GST on its taxable supply. An incorrect invoice does not automatically transfer that GST debt to the customer, and a supplier’s failure to remit GST does not by itself cancel the customer’s input tax credit (ITC). The supplier should correct a defective tax invoice, while the recipient separately checks whether its acquisition is creditable and whether it has adequate evidence.
The result changes with the facts: what was supplied, whether GST was charged, what the documents show, whether the problem existed when the transaction was reported, and whether a later event created an adjustment. The guidance below applies to Australian GST and should be checked against the current legislation and Australian Taxation Office (ATO) rulings for the relevant period.
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The two GST questions that must not be confused
Every disputed invoice raises two separate questions:
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- Recipient entitlement: Can the customer treat its acquisition as creditable and claim an ITC?
The supplier’s GST liability is not normally shifted to the recipient merely because an invoice contains a typo, the supplier has not paid its BAS debt, or the supplier becomes insolvent. The recipient’s ITC is tested under its own requirements, including the nature of the acquisition, its business use and the records it holds.
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For a creditable acquisition, ATO ruling GSTR 2000/3 describes the ITC as generally corresponding to the GST payable by the supplier, with apportionment where the acquisition is only partly creditable. That is a general rule, not a guarantee that every invoice dispute produces an ITC.
Invoice versus tax invoice: why the distinction matters
An ordinary invoice notifies a payment obligation. A tax invoice is a document containing the information required by the GST law for a taxable supply. As the ATO puts it in GSTR 2013/1, paragraph 67:
“An invoice is a document notifying an obligation to make a payment, whereas a tax invoice is a document that contains the information about a taxable supply required by the GST Act.”
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A document can therefore be commercially valid for requesting payment but still be inadequate evidence for an ITC. GSTR 2013/1 identifies defects such as a transposed legal name or ABN, an incorrect price, or a missing ABN or issue date. The error must be assessed against the information required for the particular taxable supply; not every formatting mistake has the same consequence.
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The $75 low-value threshold
For a taxable supply of $75 or less, a supplier generally does not have to issue a tax invoice (unless a higher amount is specified by regulation), subject to the applicable rules. A recipient claiming an ITC in an exception case still needs records that show what was acquired, from whom, the consideration and the business purpose. The threshold does not turn a private purchase into a creditable acquisition.
What the supplier should do when the tax invoice is wrong
Supplier correction is the ordinary route for an error that existed in the original document. A supplier that discovers missing or incorrect information can cancel the defective document and issue a replacement containing the required information, as described in GSTR 2013/1.
Supplier correction workflow
- Identify the defect. Compare the document with the actual supply, the supplier’s ABN and legal identity, the price, the issue date and the GST treatment.
- Decide whether the underlying transaction was taxable. A corrected document cannot fix an incorrect decision about whether GST applied; the supply itself must be analysed.
- Cancel or clearly supersede the defective document. Keep an audit trail showing the original document, the reason for correction and the replacement.
- Issue the corrected tax invoice. Make the supplier and transaction details consistent with the underlying records and show the GST treatment accurately.
- Correct the supplier’s reporting if necessary. If the supplier reported the wrong GST amount, deal with that as a GST error under the ATO’s correction rules rather than silently changing records.
If the customer requests a tax invoice, the supplier generally must provide one within 28 days of the request. That obligation is not removed merely because the supplier has assigned the right to receive a payment stream to another party.
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Ask in writing for a corrected tax invoice and describe the exact discrepancy. Preserve the original invoice, the request, the supplier’s response, purchase orders, contracts, delivery evidence and proof of payment. Those records help establish what was actually supplied if the replacement document arrives later or the supplier stops trading.
Can a recipient claim an ITC without a perfect tax invoice?
A recipient generally needs to hold a tax invoice when attributing an ITC, but GSTR 2013/1 describes limited alternatives. Missing information may be clearly ascertainable from another document issued by the same supplier. In specified circumstances, a tax invoice is not required, including certain low-value taxable supplies. A recipient can also ask the Commissioner to exercise discretion to treat a document as a tax invoice.
Evidence routes when information is missing
- Another supplier document: A contract, statement or related document may supply the missing information if, taken together, the documents clearly establish the required facts.
- Commissioner discretion: The recipient may request that the Commissioner treat the document as a tax invoice. This is a case-specific discretion, not an automatic entitlement.
- Statutory exception: Where the law does not require a tax invoice, retain records that still demonstrate the acquisition and the amount of GST relevant to the claim.
Do not invent missing details or infer GST solely from a total price. If the document says no GST was charged, or the supply may be GST-free or input taxed, resolve the supply’s treatment before claiming.
Practical recipient test before lodging a BAS
- Confirm that the purchase was made in carrying on the enterprise and is not private or domestic.
- Determine whether the supply was taxable, GST-free or input taxed.
- Check whether the supplier was required to be registered and whether GST was actually charged or otherwise payable.
- Match the amount claimed to the GST component and apportion any mixed business/private or taxable/input-taxed use.
- Check that a tax invoice or a recognised exception supports the attribution period.
What if the supplier defaults, becomes insolvent or does not remit GST?
Supplier default creates a collection problem for the supplier and an evidence problem for the recipient, but it does not create one universal ITC result. Separate the following questions:
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- Did the supplier make a taxable supply and become liable for GST?
- Did the recipient receive a creditable acquisition and meet the evidence requirements?
- Was GST charged, or did the supplier treat the supply as non-taxable?
- Did a later event change the transaction, or was the original reporting wrong?
Supplier charged GST but failed to pay it
If the supply was taxable, the supplier generally remains the party responsible for reporting and paying the GST. Non-remittance alone does not transfer the supplier’s GST debt to the customer. A recipient should not cancel a properly supported ITC merely because it hears that the supplier has cash-flow problems; it should, however, retain evidence that the supply was genuine, taxable and used for a creditable purpose.
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Conversely, an ITC is not created simply because an invoice has a line labelled “GST”. The recipient must satisfy the normal creditable-acquisition and documentation requirements, and the amount may need apportionment.
Supplier charged no GST and later was no longer required to pay
ATO Interpretative Decision ATO ID 2008/16 is a narrow fact pattern, not a general insolvency rule. On the facts considered, a GST-registered recipient acquired what would otherwise have been a taxable supply, but the supplier treated it as non-taxable, charged no GST and later was no longer required to pay GST because of the statutory time limit discussed in that decision. The result was that no ITC was available.
That conclusion should not be extended to every supplier insolvency, late BAS or unpaid tax debt. The decision itself warns readers to check whether the cited provisions have changed. Establish the supplier’s actual GST treatment and the current law before relying on this example.
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An unpaid customer invoice does not automatically cancel GST or an ITC. GSTR 2004/4 discusses Division 21 bad-debt adjustments for entities accounting on a basis other than the cash basis. Eligibility depends on the party claiming, its accounting basis, the relevant period and the statutory conditions. A business using the cash basis has different timing rules from a business using a non-cash basis; do not apply a bad-debt adjustment without checking those facts.
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Correction or adjustment: use the transaction timeline
The key distinction is whether the amount was wrong when it was reported or whether a later event changed a transaction that was correct at the time.
GST error
A GST error is an amount that was wrong when lodged. Examples include transposing the GST amount, using the wrong price from the outset or treating a taxable supply as GST-free in the original reporting period. The supplier or recipient must use the applicable ATO correction method for that error; relabelling it as a later adjustment does not change its character.
Adjustment event
An adjustment event occurs after the original treatment was correct and a later event changes the consideration or the GST consequences. Returns, cancellations, discounts, refunds or changes in the extent of creditable use can require an adjustment and, where applicable, an adjustment note. GSTR 2013/2 explains adjustment events and adjustment notes, including supplier obligations in the circumstances covered by that ruling.
Excess GST passed on to a customer
The ATO states that excess GST passed on to a customer is treated as payable on a taxable sale unless the supplier reimburses the customer. After reimbursement, the supplier may be able to claim a decreasing adjustment. The supplier should document the reimbursement and the related adjustment rather than simply deleting the original GST entry.
To classify a problem, write a short chronology: what the parties agreed, what document was issued, what each party knew when it lodged its BAS, and what happened afterward. That chronology usually reveals whether the remedy is a corrected tax invoice, a GST-error correction or an adjustment.
Scenario comparison
| Scenario | Who made the mistake or faced the change? | Likely treatment | Immediate action |
|---|---|---|---|
| Supplier’s ABN or legal name is transposed | Supplier; defect existed when issued | Corrected or cancelled and reissued tax invoice | Request replacement; retain both documents and correspondence |
| Price or GST amount was wrong from the start | Supplier or recipient reporting error | Correct the underlying GST error and document the reason | Reconcile contract, delivery and accounting records before correcting the BAS |
| Price reduction, return or cancellation after a correct sale | Later event changed consideration | Adjustment event; adjustment note may be required | Record the date and nature of the later event and adjust in the proper period |
| Supplier charged GST but did not remit it | Supplier default | Supplier generally remains liable; recipient’s ITC is a separate evidence question | Keep proof of the taxable acquisition and monitor requests from the ATO or administrator |
| Supplier charged no GST and treated a potentially taxable supply as non-taxable | Supplier’s GST treatment | ITC outcome depends on the actual facts; ATO ID 2008/16 produced no ITC on its narrow facts | Do not self-assess GST from the total price; obtain advice and verify the current law |
| Customer simply has not paid an invoice | Debtor default; no later change to the supply by itself | No automatic cancellation of GST or ITC; Division 21 may apply only if conditions are met | Check accounting basis, timing and bad-debt requirements |
Action checklist for recipients
- Freeze the disputed claim. Do not increase an ITC merely because the invoice total appears to include GST.
- Compare documents. Match the invoice to the contract, purchase order, delivery record and payment evidence.
- Ask the supplier for correction. State the missing or incorrect item and request a tax invoice within the applicable 28-day period.
- Check alternative evidence. Determine whether another supplier-issued document clearly supplies the missing information or whether a statutory exception applies.
- Classify the timing. Decide whether the defect existed at lodgment or a later event changed a previously correct transaction.
- Apportion the claim. Remove private, domestic or input-taxed use and claim only the creditable portion.
- Preserve an audit file. Keep the original invoice, replacement, emails, contracts, calculations and payment records together.
Action checklist for suppliers
- Keep a version-controlled record of every invoice cancelled and reissued.
- Make the corrected document refer clearly to the original so the customer does not claim twice.
- Reconcile the corrected GST amount to the BAS in which the error is fixed.
- Issue adjustment notes when a later event changes consideration and the rules require one.
- Respond to tax-invoice requests even if receivables have been assigned or an external administrator is collecting payments.
- Tell affected customers how a reimbursement or adjustment changes any GST they were charged, rather than leaving them to infer the treatment.
When professional advice is warranted
Escalate the issue to a registered tax adviser when the supplier is insolvent, the transaction is high-value, the supply mixes taxable and input-taxed activities, the parties disagree about whether GST was charged, or a statutory time limit may have expired. Keep the factual chronology and all documents available; the answer often turns on what each party knew at the reporting date.
Australian GST rulings and interpretative decisions have different legal status and fact scope. GSTR 2013/1, GSTR 2000/3, GSTR 2004/4, GSTR 2013/2 and ATO ID 2008/16 should be read with the current consolidated legislation and current ATO guidance before a material BAS correction or insolvency decision is made.
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