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You finished the job weeks ago. The invoice went out. The money hasn't arrived. Most late payments aren't caused by difficult clients — they're caused by invoices that leave a question unanswered. A missing due date, a purchase order reference nobody included, or bank details buried in a footer all give the person paying you a reason to set your invoice aside and deal with it later.
The good news is that these problems are easy to spot once you know what to look for. Seven mistakes cause most of the delay, and each one has a straightforward fix.
"Payment within 30 days" sounds clear until you ask: 30 days from what? The invoice date, the day the client received it, or the end of the month? Ambiguity is an invitation to delay.
Replace it with a specific date. "Payment due 15 August 2025 (14 days from invoice date)" leaves nothing to argue about. State the method you accept and the currency, and include a named contact for queries. If the client has a question about the amount, you want them to reach you rather than simply not pay.
Payment terms: 14 days. Due date: 15 August 2025. Pay by BACS using the details below. Queries about this invoice: contact the name and email shown at the top.
Large clients often push for 45 or 60 days. That's a commercial conversation, not an invoicing error — but agree it before the work starts, and if you're unsure what you can charge for late payment, ask your accountant.
If you're VAT registered, your invoice needs to show your VAT number and the amount of VAT charged. Leave it off and a VAT-registered client may not be able to reclaim the VAT, which gives them a good reason to leave your invoice pending until you send a corrected copy. If you're not registered, don't charge VAT and don't show a number — that mistake causes real trouble in the other direction.
Then check the arithmetic. A wrong line total, a subtotal that doesn't match the lines above it, or conflicting figures in words and numbers will all get an invoice bounced straight back. Add the lines up again before you send, rather than trusting a glance.
Some clients need extra references: a purchase order number, a job code, a site address. Ask before you begin. For anything unusual — work for a client overseas, or under the Construction Industry Scheme — check the current rules or ask your accountant.
Plenty of invoices are paid late because they never reached the right person. Sending to a general enquiries inbox, or to the manager who hired you rather than the accounts team, adds days or weeks to the process.
At the start of a job, ask three questions: who should invoices be sent to, what reference should appear on them, and does the client have a portal or a preferred format? Note the answers on the client record so you never have to ask twice. Send the invoice as a PDF, too — a spreadsheet or a photo of a paper invoice rarely survives an accounts payable system intact.
Duplicate numbers, unexplained gaps and recycled templates cause confusion on both sides. If the client's system already holds an invoice numbered 0042, yours will look like a duplicate even when it's for entirely different work.
Pick one format and stay with it: INV-2025-0412, where 2025 is the year and 0412 is a sequential number. Never reuse a number, and never leave a gap you can't explain. Then keep a simple log of the date sent, the date due, the amount and any chasing. It takes minutes when it's tidy and hours when it isn't.
Update your template once rather than editing each invoice by hand. Last month's date and an old bank account are two of the most common errors on a recycled invoice, and both make a client pause.
Payment details buried in a grey footer, no account name, a stray digit in the sort code, no reference to quote: any one of these forces someone to contact you, and that usually happens after they've moved on to something else.
Put the payment details somewhere obvious and make the amount payable unambiguous. If you accept more than one currency or method, say which one applies to this invoice. Include a payment reference so you can match the money to the invoice when it lands.
Bank details also need protecting. Invoice fraud is common: a criminal intercepts an invoice, then emails the client pretending to be you with new account details. Tell clients in writing that you won't change bank details by email alone — and if your details do change, confirm them by phone using a number the client already holds.
The most expensive mistake is silence. If you don't follow up until the invoice is three weeks overdue, you've given away every chance of catching a problem early. Often there was no problem at all — your invoice is simply sitting in a queue, waiting for approval that nobody has chased.
Diarise a simple schedule. Check the invoice arrived a few days after sending it. Send a short, friendly reminder on the due date, then a week later, then a firmer one a fortnight after that. Keep the tone polite but factual, quote the invoice number and the amount, and log every contact so you're never relying on memory.
If a client repeatedly pays late, change the arrangement rather than the chasing. Ask for a deposit or staged payments on the next job. And if you're considering charging interest or claiming compensation for late payment, remember that the UK rules are specific and that a heavy-handed approach can cost you a client — check the current position or ask your accountant first.
None of this takes long once it becomes a habit. Businesses that get paid on time usually treat invoicing as part of the job rather than an afterthought.
Photo: hudsoncrafted / Pixabay
