Missing tax invoices before BAS: how to find them and keep your GST credits
A missing tax invoice defers your GST credit, it does not cancel it. Here is what the ATO rules actually say, where invoices hide for each kind of purchase, and a BAS-week routine to recover them.
If a business purchase over $82.50 has no tax invoice behind it, you cannot claim the GST credit on this BAS. You do not lose the credit. You claim it in a later BAS once the invoice is in hand, and you have four years to do so. That is the rule, and it changes how you should spend the week before lodgement: not scrambling to justify every line, but sorting purchases into "claim now", "claim later" and "no credit here", and then going to get the invoices that are worth getting.
This article covers what the ATO actually requires, where missing tax invoices hide for each type of purchase, how to request one, and a routine for the fortnight before BAS so the same invoices do not go missing every quarter. It is written for owners who lodge quarterly. It is general information, not tax advice; your BAS agent or accountant knows your situation.
What the ATO rules say about a missing tax invoice
Four rules decide what happens to a GST credit when the document is missing. They are all on the ATO's page on when you can claim a GST credit.
Over $82.50, you need a tax invoice. The ATO's wording: "You must have a tax invoice to claim a GST credit for purchases that cost more than A$82.50 (including GST)." At or under $82.50, a receipt, cash register docket or ordinary invoice is enough, and if you have none of those, a record of the supplier's name and ABN, the date, what you bought and what you paid (a diary note counts) will do.
No invoice, no claim yet. On the non-cash (accruals) basis, you cannot claim the credit until you hold the tax invoice. The ATO says to "wait until you receive it before you claim the GST credit, even if this is in a later reporting period."
You can claim it later. An unclaimed credit is not an error. The ATO's own guidance on what counts as a GST error states that "claiming a GST credit on a later BAS because you failed to claim it in an earlier BAS is not a GST error." So you do not revise the old BAS. You add the credit to the next one.
Four years, then it is gone. "A 4-year credit time limit applies to GST credit claims." In practice this means a missing invoice costs you cash flow now, and only costs you the credit itself if nobody chases it for four years. That happens more than you would think, usually to subscriptions nobody owns.
One more rule from the same page that catches people: "When claiming GST credits, make sure your suppliers are registered for GST." If the supplier is not registered, the price did not include GST, and there is no credit to claim however good the invoice looks. You can check registration status on ABN Lookup.
What makes a tax invoice valid
Finding a document is not always the end of it. The ATO's tax invoice requirements are specific. For sales under $1,000 the document must show that it is intended to be a tax invoice, the seller's identity and ABN, the issue date, a description of what was sold including quantity and price, the GST amount (or a statement that the total includes GST where GST is exactly one eleventh), and the extent to which each sale is taxable. For sales of $1,000 or more it must also show the buyer's identity or ABN.
A PDF by email is fine. The ATO is explicit that a tax invoice "doesn't need to be issued in paper form." An eInvoice through the Peppol network also counts, even if the words "tax invoice" do not appear, as long as it carries the mandatory data.
What does not count: a card receipt from a payment terminal, an order confirmation, a bank line, or an "invoice" from an overseas SaaS vendor with no ABN and no GST line. The last one is not a defect in the document. It is usually a purchase with no Australian GST in it, and therefore no credit.
Where the missing invoices actually are
The reason invoices go missing before BAS is rarely a supplier who refused to issue one. It is that the invoice went somewhere the bookkeeping does not look. Each kind of purchase has a typical hiding place.
| What the bank line looks like | Where the tax invoice usually is | What to do |
|---|---|---|
| Monthly card charge from a SaaS or cloud vendor (Google, Microsoft, Adobe, Canva, Xero itself) | In the vendor's billing portal, or emailed to whoever set up the account, often a personal address | Log into the portal once, download the quarter, then set the billing email to a shared address |
| Ad spend (Meta, Google Ads) | Billing section of the ad account; charged in thresholds, so several bank lines map to one or two invoices | Export invoices by date range; match totals across lines, not one to one |
| Marketplace purchase (Amazon, eBay, Bunnings online, Officeworks) | In the order history; the seller may be a third party who is not GST-registered | Check the order's invoice document and the seller's ABN before assuming there is GST in the price |
| Tradie, contractor or freelancer | Sent once by email or text to whoever engaged them, or never sent because nobody asked | Request it; you are entitled to one within 28 days of asking |
| Fuel, parking, hardware, cafe | Paper receipt in a car, wallet or jacket | Photograph it the same day; under $82.50 the receipt is enough, over it you need the tax invoice version |
| Direct debit for insurance, telco, rent, software on annual billing | Emailed at renewal, months before the charge | Search the inbox by supplier name without a date restriction |
| Utilities and council rates | Mailed on paper or emailed as a bill, not always labelled "tax invoice" | Check the document meets the requirements; most utility bills do |
| Overseas vendor charged in USD or EUR | Usually no ABN, no GST | Confirm GST status; if none, there is no credit and nothing to chase |
Two patterns explain most of the gaps. The first is personal inboxes: the account was created with the owner's Gmail two years ago, the invoices still go there, and the bookkeeper has never seen that mailbox. The second is threshold billing on ad platforms, where the bank shows five charges of $200 and the platform issued one invoice for $1,000, so a one-to-one match fails and the line looks undocumented.
The quickest diagnostic is to work from what you expect, not from what you have. List every supplier that should have invoiced you this quarter and check whether each one did. A recurring supplier with no invoice in month two is a gap you can see in October. The same gap found in February, in BAS week, is a scramble.
How to request a tax invoice you never received
The ATO gives you a specific right here: "If a customer asks for a tax invoice, you must provide one within 28 days." Use it early. A request sent in the first week of the quarter after a purchase lands well inside the BAS window. One sent in BAS week does not.
Keep the request short and give the supplier what they need to find the transaction:
Subject: Tax invoice request, [your business name], [date or month]
Hi [name],
Could you send a tax invoice for [description] paid on [date] for [amount]? We need it to claim the GST credit on our BAS. Please include your ABN and the GST amount, and address it to [business name, ABN] so it meets the ATO's requirements.
Thanks, [name]
If 28 days pass with no response and you cannot assemble the missing details from other documents, the ATO page on claiming credits says you "can seek our permission to treat a document as a valid tax invoice." That is a last resort for a real dispute, not a routine step.
If the supplier sends something with the wrong entity name, the wrong amount or a missing ABN, ask for a corrected document rather than editing anything yourself. We covered what to request for each kind of error in what to do when a supplier sends the wrong invoice.
Sorting the quarter: claim now, claim later, or no credit
With the rules above, every bank line with no document behind it falls into one of three buckets. Doing this sort before BAS week turns a vague "we're missing invoices" into a short list of actions.
Claim now. The tax invoice exists and is in hand, or the purchase is $82.50 or under and you have a receipt or equivalent record. These go in the BAS.
Claim later. The purchase included GST, the supplier is registered, and the tax invoice is somewhere you can get it: a portal, a personal inbox, a supplier who has not been asked yet. Do not claim these on this BAS. Note them, chase them, and add the credits to the next BAS when the invoices arrive. Nothing is lost; the four-year clock is the only limit.
No credit. The supplier is not GST-registered, the vendor is overseas with no Australian GST, the purchase is private or relates to input-taxed supplies, or the "invoice" is an order confirmation that will never become a tax invoice. Stop chasing these. The time is better spent on the second bucket.
A worked example makes the stakes concrete. A small agency pays $4,400 a quarter across software, ad platforms and contractors by card. If $2,200 of that has no tax invoice in hand at lodgement, the GST credit on those purchases is one eleventh, or $200, deferred to the next BAS. Deferred twice because nobody chased it, that is $400 of cash sitting with the ATO for six months. Left for four years, it is gone. Small per quarter, and it compounds in exactly the suppliers nobody owns.
A BAS-week routine that does not depend on BAS week
The quarter that ends in December is the one that catches most businesses, because the holiday break sits in the middle of the collection window. The due date for the October to December BAS is 28 February, and the ATO notes that the usual extra time for online lodgement does not apply to this quarter because that due date already includes a one-month extension. The other quarters fall due on 28 October, 28 April and 28 July, with possible extra time if you lodge online or through a registered agent.
The routine below assumes you want to stop doing this under deadline pressure.
- Fix the destinations first. Every vendor portal and SaaS account should bill to one address the bookkeeping can see: a shared invoices mailbox, a forwarding address into your invoice system, or at minimum a label in the owner's inbox that someone else can access. This is a one-off job per supplier and it removes most of the personal-inbox problem permanently.
- Reconcile monthly, not quarterly. Pull the bank statement at the end of each month and match it to the invoices you hold. A missing document found in week five of the quarter has eight weeks of runway before lodgement, which is longer than the 28 days a supplier has to respond.
- Work from the supplier list. Keep a list of recurring suppliers and check each one has invoiced for the month. The absence of an expected invoice is the earliest signal you will get.
- Capture paper the same day. Photograph receipts for fuel, parking and hardware when they happen. A photo sent from a phone to the invoice system beats a shoebox every time, and under $82.50 the receipt is all the ATO needs.
- Request in writing, with a date. Log the date you asked for a tax invoice so the 28-day period is on record.
- Recover the backlog once. If the gaps go back several quarters, a retroactive sweep of the inboxes and portals for the past year will usually surface invoices that were issued and never filed. Anything inside the four-year window can still be claimed on the next BAS.
- Keep what you find for five years. Business.gov.au's record-keeping guidance is that most tax records are kept for five years from the later of when you obtained them or completed the transaction, and digital copies are acceptable. A PDF in a system you can search is a record. A PDF in a departed employee's inbox is not.
Clearing the backlog in one afternoon
If the quarter is already thin on invoices, the fastest recovery is a retroactive scan of the inbox the invoices actually go to. Connect a Gmail, Outlook or IMAP mailbox to Gennai with read-only access, set the date range back to July, and the supplier invoices already sitting there come out as captured documents, including invoices sent as text in the email body with no PDF. That alone usually surfaces a good share of the "claim later" bucket without asking a single supplier for anything, and it is the step to run before the four-year limit becomes a concern on older quarters.
From there the routine runs on its own channels. New invoices are captured as they arrive. Paper receipts go in as a photo through WhatsApp or Telegram, one-off invoices to a private forwarding address. Gennai extracts the accounting-relevant data, flags duplicates across channels and keeps the original document alongside, so the tax invoice is there when the BAS agent asks for it.
The sorting step comes from the bank statement. Upload the quarter as a CSV or spreadsheet and Gennai matches transactions against the captured invoices, updates payment status and lists the bank lines with no document behind them. That list is the "claim later" bucket, produced from the statement rather than from memory. Reviewed invoices export to Xero or QuickBooks Online as purchase-side records, and for Australian batch payments Gennai can generate the ABA file from the invoices marked to pay; the workflow is in ABA files made simple.
What Gennai does not do: connect to your bank, lodge your BAS, or decide what is claimable. It gets the documents into one place and shows you where the gaps are, which is the part of BAS preparation that usually eats the week.