Use AI to chase invoices, reduce late payments, and get paid faster

Getting paid is the most important thing your business does. Not winning work, not delivering it brilliantly, not getting great reviews. Getting paid. Because none of the rest matters if the money doesn't arrive.

Late payment is endemic in the UK. Legislation exists to address it (the Late Payment of Commercial Debts Act entitles you to charge 8% above the Bank of England base rate on overdue invoices, plus fixed compensation fees). Very few small businesses exercise this right because they worry about damaging client relationships.

AI and automation let you chase professionally, consistently, and without any of the awkwardness. Here is how.

The psychology of getting paid

The businesses that get paid fastest are the ones that make payment feel expected, normal, and easy. That means:

Clear payment terms on every invoice
Automated reminders that go out regardless of how much you like the client
A professional tone that is firm without being aggressive

When a reminder comes from a system rather than you personally, it removes the social awkwardness entirely. Most clients appreciate the clarity.

Writing payment reminder emails with Claude

You need three templates: a gentle first reminder, a firmer second reminder, and a formal final notice. Write them once with Claude and use them forever.

Prompt to copy:

"Write three invoice payment reminder emails for a UK business. Payment terms are 30 days from invoice date. Email 1 (7 days overdue): polite and friendly, assume the invoice may have been missed. Email 2 (14 days overdue): firmer tone, reference the invoice again clearly, mention payment terms, ask for payment by a specific date. Email 3 (30 days overdue): formal tone, state that the account is significantly overdue, mention the Late Payment of Commercial Debts Act and the right to charge interest, give a final deadline of 7 days before further action is considered. All emails should include placeholders for: [client name], [invoice number], [invoice date], [amount due], [your business name], [payment link or bank details]. UK English."

Here is what the three emails typically look like:

Email 1 (7 days overdue):

Subject: Invoice [number] - gentle reminder

Hi [Name],

I hope you are well. I just wanted to drop a quick note as invoice [number] for [amount] dated [date] appears to be outstanding. Our payment terms are 30 days, so this was due on [due date].

If payment has already been made, please ignore this message. If not, you can pay by bank transfer to [details] or via the link below.

Do let me know if you have any questions.

Many thanks, [Your name]

Email 2 (14 days overdue):

Subject: Invoice [number] - payment now 14 days overdue

Hi [Name],

I am writing to follow up on invoice [number] for [amount], which was due on [due date] and remains outstanding.

I would be grateful if you could arrange payment by [date, 7 days from this email]. If there is a query or problem with the invoice, please let me know and I will resolve it quickly.

Payment can be made by bank transfer to [details].

Kind regards, [Your name]

Email 3 (30 days overdue):

Subject: Invoice [number] - final notice before further action

Dear [Name],

Invoice [number] for [amount] is now 30 days overdue. Despite two previous reminders, payment has not been received.

Under the Late Payment of Commercial Debts (Interest) Act 1998, we are entitled to charge interest at 8% above the Bank of England base rate on all overdue amounts, along with fixed compensation fees. We have not applied these charges yet but reserve the right to do so.

We require payment of the full outstanding amount of [amount] by [date, 7 days from now]. If payment is not received by this date, we will consider further action to recover the debt.

Please contact me urgently if there is a dispute regarding this invoice.

Yours sincerely, [Your name]

Automating reminders with Zapier

Manual chasing is unreliable. You forget, you feel awkward, you send it three days late. Automation is consistent.

Set this up in Zapier:

Zap 1: 7-day reminder

Trigger: Invoice sent in Xero, QuickBooks, or FreeAgent
Action: Wait 7 days
Check: Has invoice status changed to "Paid"? If yes, stop. If no, send Email 1.

Zap 2: 14-day reminder

Trigger: Same invoice sent
Action: Wait 14 days
Check: Paid? If no, send Email 2.

Zap 3: 30-day reminder and task

Trigger: Same invoice sent
Action: Wait 30 days
Check: Paid? If no, send Email 3 AND create a task: "Escalate overdue invoice [number] for [client]."

This runs automatically for every invoice. You send the invoice. Everything else is handled.

Drafting escalation letters

If 30 days of automated reminders hasn't worked, you need something more formal. This might be a letter before action (the formal step before small claims court) or a referral to a debt recovery service.

Prompt to copy:

"Write a formal letter before action for a UK business. The debtor is [company name]. Invoice number: [number]. Amount outstanding: [amount]. Original due date: [date]. We have sent reminders on [dates]. Under the Late Payment of Commercial Debts Act, we are entitled to add interest of 8% above base rate plus compensation. Please write a professional letter giving 14 days to pay before we consider court action via the UK small claims process. Include that we will claim costs if we proceed to court. Formal UK legal-style language but not overly legalistic."

Send this via email and post. Keep a record of when it was sent.

The small claims court in England and Wales handles claims up to £10,000. Filing costs start at £35. Most clients pay before it gets to that stage.

The faster payment habits

Three habits that get invoices paid faster:

Invoice on the day work is completed, not the end of the month.
Include payment links directly in the invoice where possible.
State payment terms prominently on the invoice, not buried in small print.

Combined with automated reminders and AI-drafted chasers, these habits will meaningfully improve your cashflow within a month.