Quick answer
When a customer rejects your invoice, the payment clock usually restarts from the date you resubmit a corrected one, and if you miss the cut-off for the next payment run, a 30-day invoice can quietly become 45 or 60 days. Find the exact reason, fix only that, resubmit before the run's cut-off, and ask accounts payable for the new pay date in writing.
Key points
- Count the cost in payment runs, not days: missing one weekly or fortnightly run adds that whole cycle, and a monthly run adds up to a month.
- Most rejections are fixable in one email: a missing purchase order number, wrong entity name, missing ABN, or no goods-received sign-off.
- A valid tax invoice for sales over $82.50 must carry the words 'tax invoice' and your ABN, and for $1,000 or more, the buyer's identity or ABN.
- Commonwealth agencies aim to pay eligible eInvoices within 5 calendar days and other invoices within 20, with late-payment interest where it reaches $100.
- If the delay will outlast your next pay run or BAS, price a short bridge in dollars before you decide.
The email lands mid-afternoon: “Invoice returned, please resubmit.” You sent it on time, the work is done and the customer’s own team approved it. Now the invoice you were counting on is back at day zero.
What matters next isn’t the rejection itself. It’s the calendar. A rejected invoice costs you whatever stretch of time sits between the original pay date and the next point at which the customer can actually pay the corrected one. This guide helps you count that stretch, shorten it and decide whether to bridge it.
Why does one rejection cost more than one day?
Large customers don’t pay invoices one at a time. They pay in batches, on set days, from an approved list that closes before the run. If your corrected invoice isn’t approved by the cut-off, it waits for the next batch.
| Customer’s payment run | Cost of missing one cut-off |
|---|---|
| Weekly | Up to 7 days |
| Fortnightly | Up to 14 days |
| Monthly (common for large payers) | Up to about 30 days |
Add the days the rejection itself took to arrive, plus the day or two to fix and resubmit, and a 30-day invoice can slide to 50 or 60. That’s the same slow tail the Payment Times Reports Register captures. The regulator’s slow-tail figure for large businesses runs well past typical terms, and a rejected invoice is exactly how an invoice ends up in it. Our guide on how fast big customers really pay explains how to read those numbers.
Do payment terms restart when an invoice is reissued?
In practice, mostly yes. Most large payers treat the invoice date, or the date they received a valid invoice, as day one. A corrected invoice is a new invoice, so the count restarts.
Two things to pin down in writing before you resubmit:
- Which date they’ll count from. If the original was rejected for a customer-side problem (for example, their own PO wasn’t raised), ask whether they’ll honour the original receipt date. Sometimes they will, if you ask.
- Which payment run it will make. Ask for the cut-off date and the pay date, not “as soon as possible”.
Your contract or supplier agreement may already answer this, so check it before you argue.
What are the most common reasons an invoice gets rejected?
Ask accounts payable for the specific reason. Don’t guess and resubmit, because a second rejection doubles the damage. The usual suspects:
- Purchase order mismatch. No PO number, an expired PO, or amounts that exceed the PO value.
- Wrong entity. The invoice names a trading name or the wrong company in a group.
- Tax invoice details. For a sale over $82.50, the ATO requires the words “tax invoice”, your ABN and the GST amount, and for $1,000 or more the buyer’s identity or ABN. See the ATO’s tax invoice requirements.
- No receipt on their side. Nobody signed off the goods or hours, so the system can’t match the invoice.
- Format. Some payers only accept PDF to a specific mailbox, a supplier portal upload or an eInvoice.
- Duplicate flag. You reissued with the same number and their system treated it as a copy.
What’s the fastest sequence to get paid in this run?
Work backwards from the cut-off, in this order.
- Today, within the hour: ask for the rejection reason and the payment-run cut-off. Phone as well as email if the cut-off is within two business days.
- Fix only what was flagged. Changing other details can trigger a fresh review.
- Get the approver on your side. The person who ordered the work can often push a PO amendment or goods receipt through faster than accounts payable can.
- Resubmit through their stated channel, with the PO number in the subject line and the invoice itself.
- Ask for written confirmation of receipt and the pay date.
- Diarise the day before the cut-off to check it’s actually in the run.
The paperwork stopwatch is built for the same idea on the lending side: see what is missing and what each gap costs in time.
Can eInvoicing stop this happening again?
Partly. eInvoicing means your software sends a structured invoice straight into the customer’s system over the Peppol network, so there’s no PDF to be re-keyed or misread. The ATO says many small businesses can already use eInvoicing through their existing accounting software.
For Commonwealth government customers, there’s a payment incentive too. Under the Supplier Pay On-Time or Pay Interest Policy, non-corporate Commonwealth entities should pay eligible eInvoices within 5 calendar days and other invoices within 20, and interest is payable where it reaches $100. For private customers there’s no such rule, so ask what they accept.
What does a rejection cost in dollars?
Illustrative example only, not a real client. A signage business invoices a large retailer $48,000 on 5 March on 30-day terms, expecting payment in early April. The retailer pays suppliers once a month, on the 25th, for invoices approved by the 20th. On 12 March the invoice is rejected because the PO number was missing, and the corrected invoice goes back on 13 March.
| Step | Date | What happens |
|---|---|---|
| Original invoice | 5 March | Expected pay date: about 4 April |
| Rejection | 12 March | Invoice returned |
| Corrected invoice resubmitted | 13 March | Terms restart; due about 12 April |
| Run cut-off | 20 April | Invoice is due before this, so it’s approved for this run |
| Paid | 25 April | About 21 days later than planned |
Had the fix taken until 21 April, it would have missed the cut-off and waited for the 25 May run, adding another month. Meanwhile the business has wages every pay cycle, super within 7 business days of each payday (Payday Super, since 1 July 2026) and a BAS to lodge.
That’s the moment to price a bridge. If the gap is about three weeks on $48,000, compare the total dollar cost of short funding with the cost of what you’d otherwise miss: a supplier early-payment discount, a late fee or a missed pay run. Our guide on supplier discount deadlines shows how to run that comparison in dollars.
How do you stop it happening on the next invoice?
Most rejections are repeats. Spend twenty minutes after this one is paid on a short checklist, and the next invoice goes through first time.
- Keep a one-page “how to invoice this customer” note: legal entity name, billing address, ABN, PO format, approver, accepted channel and run dates.
- Raise the invoice with the PO number as the first line, and check the amount against the PO before sending.
- Get goods-received or timesheet approval before invoicing, not after.
- Send the invoice a few business days before the cut-off, not on it, so there’s room for one fix.
- Look the customer up on the register so you know its typical and slow-tail pay times and can plan the buffer.
When does it make sense to bridge the gap?
Bridging is sensible when three things are true: the invoice is genuinely approved and just stuck in process, the new pay date is after a cost you can’t move, and the dollar cost of the bridge is smaller than the cost of waiting.
If that’s you, smaller amounts can often be handled with unsecured funding sized on your turnover and bank statements, typically $5k to $500k, with same-day funding possible for smaller amounts. For larger gaps, a property-secured loan from $20k to $5m is an option, with $20k to $250k possible the same day and up to $5m possible within 24 to 48 hours. How quickly any funds land depends on documents and timing, and the when funds land page walks through the stages.
If you’d like a real person to look at your numbers, find out where you stand in about 60 seconds.
Ready to see what a short bridge could look like?
A rejected invoice is frustrating because it’s not your cash problem, it’s a paperwork problem that shows up as a cash problem. If you’ve fixed the invoice and the new pay date still falls after a wage run, a BAS or a supplier bill, it’s worth knowing your options before the date arrives, not after.
Making an enquiry takes about 60 seconds, and there’s no credit check when you enquire, so asking won’t touch your credit file. We don’t send your details out to a pile of lenders, so your phone won’t light up with strangers. A real person reads your situation and calls you to talk it through. All we ask is that you fill the form in accurately, including your turnover and what the money is for, so we can match the right option first time.
Frequently asked questions
Do payment terms restart when an invoice is rejected and reissued?
Usually, yes in practice. Most customers count terms from the date they receive a valid invoice, so a corrected invoice starts a fresh count. Check your contract or supplier agreement, and ask accounts payable in writing which date they'll treat as the invoice date.
Why would a big company reject my invoice?
The usual causes are a missing or wrong purchase order number, the wrong legal entity or billing address, a missing ABN or 'tax invoice' wording, amounts that don't match the order, or no goods-received or timesheet approval on their side. Ask for the exact reason code rather than guessing.
Should I issue a credit note and a new invoice, or just edit the invoice?
Follow the customer's process. Many large payers want a new invoice number, with the old one cancelled or credited, so their system doesn't flag a duplicate. Your accounting software can raise a credit note and a replacement quickly, and your accountant can confirm the GST treatment.
What must be on a tax invoice in Australia?
For a taxable sale over $82.50 including GST, the ATO says the invoice must show the words 'tax invoice', your identity and ABN, the date, a description of what was sold, and the GST amount. For $1,000 or more, it must also identify the buyer or show their ABN. Check the ATO's tax invoice page for the full list.
Can eInvoicing get me paid faster?
For Commonwealth government customers, yes: the Supplier Pay On-Time or Pay Interest Policy sets a maximum of 5 calendar days for eligible eInvoices against 20 for other invoices. For private customers there's no such rule, but eInvoices skip manual re-keying, which is where many rejections start.
How do I find out how slow a big customer usually is?
Search the Payment Times Reports Register for the customer. Its typical payment time and slow-tail figure tell you how long a normal invoice and a problem invoice tend to take, which helps you size any gap.
When is it worth borrowing against a rejected invoice?
When the new pay date lands after a cost you can't move, such as wages, super or a BAS, and the dollar cost of bridging is smaller than the penalty or opportunity you'd otherwise lose. Work that comparison out first, then decide.