Invoice Accuracy Checklist
An accurate invoice gets paid faster and creates fewer disputes. Run through this checklist before every invoice leaves your desk.
What this checklist covers
- Catch common errors before an invoice goes out
- Make sure every line item is correct and priced right
- Confirm the customer and payment details are accurate
- Reduce queries, short-pays and disputes
- Build a repeatable pre-send routine for your team
5 min
Before you start
The cheapest invoice error to fix is the one you catch before sending. A wrong figure, a missing line or the wrong bank details can stall payment for weeks while the customer queries it, so a two-minute check pays for itself. Before you begin, have the original quote, purchase order or job sheet in front of you so you can match what you are billing against what was agreed.
Set yourself up to check against a source, not from memory. If you reuse a previous invoice as a template, treat every field as suspect until you have confirmed it against this job.
Check who and what you are billing
Start with the basics that decide whether the invoice is even valid for this customer:
- The customer's correct legal or trading name, spelled exactly as they use it
- The right billing contact and email address
- Any purchase order or reference number the customer requires
- The correct delivery or service address where relevant
- That this is the right entity — a head office and a branch can be different payers
Getting the payer wrong is one of the most common reasons an invoice is rejected on receipt, so do not rush this step.
Check the numbers line by line
Now work down the detail of the invoice:
- Confirm each line item describes what was actually supplied
- Check quantities against the job sheet, timesheet or delivery note
- Verify the unit price or rate matches the quote or agreed rate
- Re-add the subtotal rather than trusting a copied figure
- Confirm any GST is applied correctly and the total reconciles
- Check discounts, deposits already paid and credits are deducted
If the total looks surprising in either direction, stop and find out why before sending.
Check the payment and admin details
Finally, confirm the parts that let the customer actually pay you:
- The invoice number is unique and follows your sequence
- The issue date and due date are both shown and correct
- Your payment terms are stated clearly
- Your bank details, BSB and account number are right
- Any payment link or reference for matching is included
Wrong bank details are worse than a wrong total — money can end up in the wrong account. Double-check them against your master record, not a copied invoice.
Common mistakes
A few errors come up again and again. Avoid these:
- Copy-paste carryover — leaving a previous customer's name, PO or figures on a reused template
- Stale rates — billing last year's price after a rate rise
- Forgotten deposit — invoicing the full amount when a deposit was already paid
- Missing PO — omitting a reference the customer's system requires to pay
Build the check into your process with a consistent template. Our free invoice tools set out the standard fields so nothing gets dropped, and if accuracy slips are already costing you payments, a free debt appraisal can help you see where invoices are stalling.
Key takeaways
- Always check the invoice against a source document, not from memory.
- Confirm the payer, the line items and the bank details before sending.
- Wrong bank details and missing PO numbers stall payment more than wrong totals.
- A consistent template makes the accuracy check fast and repeatable.
Frequently asked questions
How long should an accuracy check take?
Once you have a routine and a consistent template, a couple of minutes per invoice. The time is repaid many times over by avoiding queries and re-issues.
Should a second person check invoices?
For high-value invoices, a second pair of eyes catches errors the author misses. For routine invoices, a good template and a checklist are usually enough.
What is the most common invoice error?
Carryover from a reused template — an old name, reference or figure left in place. Treat every field as suspect when you copy a previous invoice.
Work the checklist, then get paid
Use the free Invoice Generator, then let Merion recover anything that goes unpaid — commission-only.