AI agents for business finance: what they can and can't do
What AI agents can do in bookkeeping, close, collections and compliance today, where a person must stay in charge, and how to judge a product.
The short answer
An AI agent can send polite, well-timed reminders, log every contact, and work out the statutory interest and fixed compensation the Late Payment of Commercial Debts (Interest) Act 1998 allows on business-to-business debts. What it should not do alone is charge interest to a valued client, threaten legal action or start a claim; those decisions affect relationships and need a person.
Your rights on a late business invoice
When one business pays another late in the UK, the Late Payment of Commercial Debts (Interest) Act 1998 gives the supplier a right to statutory interest and fixed compensation, unless the contract sets out a substantial alternative remedy. It applies to business-to-business sales, not to sales to consumers. If no payment date was agreed, the law treats payment as due 30 days after the customer received the invoice or the goods or services, whichever is later.
| What you can claim | Amount |
|---|---|
| Statutory interest | 8% a year above the Bank of England reference rate |
| Fixed compensation, debt under £1,000 | £40 |
| Fixed compensation, £1,000 to £9,999.99 | £70 |
| Fixed compensation, £10,000 or more | £100 |
| Reasonable recovery costs | Can be claimed where they exceed the fixed sum |
The reference rate is the Bank of England base rate on 31 December for debts that became overdue in January to June, and on 30 June for July to December. The government has also introduced the Small Business Protections Bill, which would limit payment terms and give the Small Business Commissioner new powers. At the time of writing it was still before Parliament and not law, so check the current position before relying on it.
Why invoices go unpaid, and what an agent changes
Most late payments in small firms are not disputes. The invoice went to the wrong inbox, the purchase order number was missing, the client's payment run happens monthly, or nobody followed up. Chasing is dull, awkward and easy to postpone, which is why it suits an agent.
- It checks the invoice is complete before sending: purchase order number, correct legal entity, payment details, due date.
- It sends reminders on a schedule you set, in your tone, and stops the moment a payment lands.
- It reads replies and sorts them: promise to pay, query, dispute, out of office.
- It routes a query about the work to the person who did it, and a dispute to you.
- It keeps a dated log of every contact, which matters if you later go to court.
Prevention helps as much as chasing. An agent can check new clients before work starts, confirm who approves invoices on their side, and make sure your payment terms and the right to statutory interest are stated on every invoice. Clear terms at the start make the later conversation easier.
A sensible chasing sequence
- Three days before the due date: a short note that the invoice is due, with the payment details.
- Seven days overdue: a friendly reminder, attaching the invoice again and asking whether anything is holding it up.
- Fourteen days overdue: a firmer message naming the amount and asking for a payment date.
- Twenty-one days overdue: the agent stops and raises a decision to you, with the history, the client's value to the business and the interest that could be claimed.
- After your decision: a statement of statutory interest and compensation, a call from you, a pause, or a formal letter before action drafted for your approval.
The agent's job at step four is to give you the facts in one place, not to escalate on its own. Many owners choose not to charge interest to a long-standing client who pays reliably but slowly; others add it routinely. Both are business decisions.
A worked example: a 45-day-late invoice
This is an illustrative example using an assumed reference rate of 4%. A small IT support firm in Manchester invoiced a client £4,800 on 30-day terms. Payment arrives 45 days after the due date. Statutory interest is 12% a year (8% plus 4%), so the daily interest is £4,800 × 12% ÷ 365, about £1.58, and 45 days comes to about £71. Because the debt is between £1,000 and £9,999.99, fixed compensation is £70. The firm could claim about £141 on top of the invoice.
The agent works this out and shows it to the owner alongside the client's payment record over the past year. The owner decides to waive it this time but tells the client future late payments will attract interest. The agent records the decision and the message.
When a person must step in
- Any genuine dispute about the quality or scope of the work.
- A client in financial difficulty, insolvency or administration, where the rules change.
- Sole trader customers, where the Pre-Action Protocol for Debt Claims sets specific steps before court.
- Any threat of legal action, a letter before action or a county court claim.
- Large or strategically important clients, whatever the amount.
If a larger business repeatedly pays you late, the Office of the Small Business Commissioner can look into complaints from small suppliers. An agent can assemble the evidence pack; you decide whether to file it.
Where Pryme fits
The Pryme Sales agent holds receivables alongside the pipeline and drafts follow-ups that cite the thread they came from, while the Finance agent matches payments as they land so chasing stops the moment a client pays. Pryme invoicing issues the invoice from the same account in GBP, USD, EUR or NGN. Anything beyond the cadence you set comes to you. For more on the process, read AI for accounts receivable and Cash flow forecasting with an AI agent.
Questions people ask
Can I charge interest on a late invoice in the UK?
For business-to-business debts, usually yes: the 1998 Act allows statutory interest at 8% above the Bank of England reference rate, unless your contract has a substantial alternative remedy.
Can I add a late payment fee to a consumer invoice?
The 1998 Act does not apply to consumers. Any charge must be in your agreed terms and be fair under consumer law. Take advice.
Will automated reminders annoy my clients?
They can if they are badly timed or rude. Set the tone and cadence yourself, stop reminders when a client replies, and let the agent escalate to you rather than keep sending.
Are the new late payment rules in force?
Not yet. The Small Business Protections Bill, which would cap payment terms and strengthen the Small Business Commissioner, was still before Parliament at the time of writing. Check GOV.UK for the current position.
Sources
- Late commercial payments: charging interest and debt recovery · accessed Oct 2026
- Late Payment of Commercial Debts (Interest) Act 1998 · accessed Oct 2026
- Office of the Small Business Commissioner · accessed Oct 2026
- UK government ploughs ahead with late payments bill (ICAEW, May 2026) · accessed Oct 2026
This article is general information, not financial, legal or tax advice. Products described are provided under the terms on this site and are subject to regulation and eligibility.