Overdue invoice: how to chase payment without burning the relationship

An overdue invoice is one of the most stressful and most common problems in a small service business. You did the work, the client was happy, or at least didn't raise any issues, and the money just hasn't appeared. The instinct for many people is to go quiet and hope it arrives. That instinct is expensive.

Most late payments aren't bad faith. They're admin slippage: the invoice got filed in a mental 'deal with later' folder, or the client assumed direct debit was set up when it wasn't, or the accounts payable person is out on leave. A calm, consistent chase process resolves the majority without drama, and the minority that don't respond tell you something important about the client.

Before you chase: check your end first

Before sending anything, spend two minutes confirming: Did the invoice actually go out? Did you send it to the right email address? Was the due date stated clearly and prominently? Did you include the right payment details? A surprising number of 'late' invoices either never arrived or landed in a spam folder with a vague subject line. Check your sent folder. If you're not using invoicing software, an invoice can easily fall through the cracks on your end too.

Also check: is there an open dispute about the quality of the work? A client who has a grievance about what you did will often use the invoice as a lever, deliberately going slow to avoid a difficult conversation. If that's the situation, the chase process is a prompt for a conversation that needs to happen, not a billing admin problem.

The first reminder: due date or one day after

Send the first reminder the day the invoice falls due or the day after. Tone: friendly, factual, and without apology. You're not in the wrong. You did the work. The money is owed. A polite reminder is not aggressive, it's professional.

"Hi [name], just a quick note, invoice [number] for £[amount] was due today. Please let me know when you're able to process payment, or if you need me to resend anything. Thanks."

That's it. No long recap of the job, no 'I hope this finds you well', no apology for chasing. Short messages get replied to faster. Long ones get deferred. If you're sending it by email, keep the subject line functional: 'Invoice [number], payment due today'.

The second reminder: five to seven days overdue

If there's still no payment or response after five to seven days, send a second chaser. Same tone, calm and professional, but slightly more direct. Introduce the concept of a late fee so there's a clear consequence to continued delay.

"Hi [name], following up on invoice [number], it's now [X] days overdue. The amount outstanding is £[amount]. If there's any issue with the invoice or the work, I'm happy to discuss it. Otherwise I'd appreciate payment by [date]. Late payment fees will apply if it runs past that date."

The late fee mention is important, not as a threat, but as a genuine signal that you have a late payment policy and you're applying it. Whether or not you actually charge one is your decision, but stating it is effective. Many clients pay promptly the moment they see a late fee mentioned, because they'd genuinely rather pay the invoice than pay more.

Understanding your legal rights on late payment

In the UK, the Late Payment of Commercial Debts Act gives you a statutory right to charge 8% above the Bank of England base rate on overdue B2B invoices, plus a fixed compensation fee of £40 (invoices under £1,000), £70 (£1,000–£10,000), or £100 (over £10,000). You don't need to have mentioned late fees on the original invoice, the statutory right exists automatically for business-to-business debts.

For consumer clients (domestic, not commercial), late fees are a contractual rather than statutory matter. Include your late fee policy in your terms and conditions and reference it on every invoice. In the US, late fees are governed by state law and typically need to be disclosed in advance, check your state's rules, but a standard 1.5%/month late fee stated clearly on invoices is acceptable in most states.

The third reminder: 14 days overdue

By day fourteen, you're moving from friendly to formal. Change the communication channel if you've only been emailing, a phone call is significantly harder to ignore than an email, and it often resolves things in a two-minute conversation. Call first, then follow up in writing the same day so there's a paper trail.

• Call and state the situation plainly: 'Invoice [number] for [amount] is now 14 days overdue. I need to understand when I can expect payment.'
• Follow the call with a written message: 'As discussed, payment of £[amount] for invoice [number] is outstanding. I need this settled by [date].'
• Be clear about what happens next: 'If I don't receive payment by [date], I'll need to refer this to a debt recovery service / county court.'

Keep the tone factual throughout. Anger or frustration rarely speeds payment, it gives the client something to argue against and can be used against you if matters escalate. The goal is a paper trail showing you gave clear, reasonable notice before taking further steps.

What to do when they still don't pay

After clear written notice and no response or payment, you have several escalation paths. The right one depends on the amount outstanding and whether the client is a business or a consumer.

• UK Small Claims Court (Money Claim Online): for debts under £10,000, the filing process is online, costs £35–£455 depending on the amount, and a County Court Judgment (CCJ) is a serious credit event for the debtor. Most debtors settle before judgment.
• US Small Claims Court: filing fees are low ($30–$75), limits vary by state (typically $5,000–$10,000), and you don't need a solicitor. Courts are accessible and sympathetic to small service businesses.
• Debt collection agency: takes 15–40% of the amount recovered. Justified for invoices over £500–£1,000 where you've exhausted your own process. The threat of collection is often enough to prompt payment.
• Statutory demand (UK, debts over £750): a formal legal warning that is a precursor to winding-up proceedings for a company or bankruptcy for an individual. Very effective for clear, undisputed debts. Only use it for business debts where you're confident the debt is not disputed.

How to prevent late payment in the first place

The best way to deal with an overdue invoice is to reduce how often they happen. A few habits cut late payment rates significantly, and most of them are simple to implement from the start.

• Invoice the same day the job is done, not at the end of the week
• Require a 25–50% deposit on larger or first-time jobs
• Include a card payment link on every invoice so clients can pay in under a minute
• State your due date explicitly on the invoice, not just your terms
• Include your phone number on the invoice so a confused client can call rather than ignore
• Set up automated reminders, most invoicing software can send these for you

Frequently asked questions

How long should I wait before chasing an overdue invoice?

Chase on the due date or the day after. Waiting a week 'to be polite' is a common mistake that simply adds a week to your payment cycle. A prompt, friendly reminder the day payment is due is professional and expected. Most clients appreciate the nudge, it saves them from a late fee and keeps them in good standing.

What if the client says they never received the invoice?

Resend it immediately with a read receipt if your email client supports it. If you're using invoicing software, send it via the platform again and note the resend date. Don't argue about whether they received it, just resend and confirm a new due date. If this becomes a pattern with the same client, move to PDF attachment plus copy-paste in the body, and consider requiring a deposit on future work.

Can I charge interest on overdue invoices?

In the UK, yes, the Late Payment of Commercial Debts Act gives you a statutory right to claim 8% over base rate on overdue B2B invoices, plus a fixed compensation fee. For consumer clients, you need to have stated a late fee in your terms. In the US, you generally need to disclose your late fee policy in advance, on the invoice itself or in your service agreement, and comply with your state's limits.

Is it worth taking a client to small claims court for a small amount?

For debts over £200–£300, small claims is usually worth it. The filing fee is modest, the process is designed for non-lawyers, and most debtors settle before the hearing date once they realise you're serious. For debts under £100, weigh up the time cost against the likely outcome. The bigger value of small claims for small businesses is the deterrent effect, a client who knows you'll pursue through the courts is less likely to treat you as a soft target in future.