The Most Common Invoicing Mistakes (and How to Avoid Them)
Every invoicing mistake is a delay to payment. And every delay to payment is a cash flow problem waiting to happen.
The good news is that most invoicing mistakes are simple to fix once you know what to look for.
Mistake 1: Invoicing Late
This is the most common and most costly mistake. Many businesses finish a job and then wait days — or even weeks — to send the invoice.
Your payment clock does not start until the invoice is sent. If your terms are 30 days and you wait a week to invoice, you have effectively given yourself 37-day terms.
Fix: Invoice the same day work is completed. Make it a non-negotiable habit.
Mistake 2: Unclear Payment Terms
"Payment due within 30 days" is vague. 30 days from when? From invoice date? From receipt? From end of month?
Ambiguous terms create delays because clients can legitimately interpret them differently. They also make it harder to follow up on overdue invoices.
Fix: Use a specific due date on every invoice. "Payment due by [date]" is clearer than "Net 30."
Mistake 3: Sending to the Wrong Person
In many businesses, the person who approves the work and the person who processes invoices are different. If your invoice goes to the project manager but the accounts team does not receive it, it will sit unprocessed.
Fix: Ask your contact upfront: "Who should I send invoices to?" and get the accounts payable email address directly.
Mistake 4: Missing Information
Invoices with missing details get kicked back and delayed while information is gathered. Common omissions include:
- Purchase order (PO) number — many large businesses require this
- ABN or NZBN
- GST details
- Bank account details for payment
- Description of work specific enough to match the client's records
Fix: Create a checklist of required fields for each major client and tick it off before sending.
Mistake 5: No Follow-Up Process
Sending an invoice and then hoping for payment is not a strategy. Invoices get buried in inboxes. Payment runs get missed. Without a follow-up process, overdue invoices stay overdue.
Fix: Set up automated reminders in your accounting software. A reminder at due date, and again at 7 days overdue, catches most delays without manual effort.
Mistake 6: Making It Hard to Pay
If a client has to figure out how to pay you, they will often delay until they get to it. Do not make them hunt for your bank details or call you to ask how to process the payment.
Fix: Include full payment details on every invoice. If possible, include a direct payment link.
When Good Invoicing Is Not Enough
Even a perfect invoicing process does not guarantee clients will pay on time. Some clients have long payment terms as policy. Some pay slowly regardless of your reminders.
For situations where you need the cash before the client pays, FundTap advances funds against your outstanding invoices — within hours. You have sent the invoice. The work is done. FundTap gets you the money without the wait.
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