Overdue Invoice: How to Handle Late Payments Step by Step

Quick answer: An overdue invoice is any invoice still unpaid after its due date. To handle it, first confirm the client received a correct invoice, then send a polite reminder, follow up by phone, and agree a firm payment date. If payment still doesn't arrive, apply any agreed late fees or statutory interest, pause further work, send a final notice, and escalate to collections or a small claims court as a last resort.

This guide gives you a practical timeline for dealing with an overdue invoice, what to check before you chase, how statutory interest works in the UK and EU, and how to decide when to escalate. If you need to reissue or resend the invoice, our free invoice generator lets you recreate a clean PDF in minutes.

What makes an invoice overdue?

An invoice becomes overdue the day after its due date passes without full payment. That sounds obvious, but many overdue invoices start with vague terms. "Net 30" without a calendar date, or no terms at all, leaves room for argument. Where nothing was agreed, some laws fill the gap: in the UK and the EU, business-to-business payments generally default to 30 days after the invoice or delivery. Our guide to invoice payment terms shows how to set terms that are hard to misread.

Step 1: Check your own side first

A surprising number of overdue invoices are not late at all from the client's point of view; they are stuck. Before chasing, check:

• Delivery: did the invoice reach the right accounts payable address, not just your day-to-day contact?
• Accuracy: are the billing entity, amount, tax and line items correct?
• References: did you include the required PO number or supplier ID?
• Approval: has the work been signed off, or is something still under review?
• Disagreement: has the client raised any concern? If so, treat it as an invoice dispute rather than a late payment.

If anything is wrong, fix it and reissue promptly. A corrected invoice resets the conversation in your favor.

A practical timeline for an overdue invoice

When	Action	Tone
3 days before due	Friendly heads-up with the invoice attached	Helpful
1 day overdue	Polite reminder asking for a payment date	Neutral
7 days overdue	Second reminder plus a phone call to accounts payable	Firm but friendly
14 days overdue	Escalate to your main contact or a manager; mention agreed late fees	Firm
30 days overdue	Pause further work if your contract allows; apply late fees or interest	Formal
45 days overdue	Final notice with a deadline and the next step you will take	Formal
60+ days overdue	Collection agency, demand letter or small claims court	Formal

Adjust the timeline to the size of the invoice and the relationship. For wording at each stage, use our ready-made payment reminder emails rather than writing from scratch.

Worked example: a $3,200 invoice due 30 September

A marketing consultant invoices $3,200.00 on 31 August 2026, due 30 September 2026. Here is how the follow-up might run:

1. 27 September: courtesy email with the invoice attached and the payment link.
2. 1 October: reminder: "Invoice INV-2026-0144 for $3,200.00 was due yesterday. Could you confirm when payment is scheduled?"
3. 7 October: call to accounts payable. They say the invoice was never approved because it went to the wrong inbox. The consultant resends it to the correct address.
4. 9 October: the client confirms payment in its 15 October payment run.
5. 15 October: payment arrives; the consultant sends a receipt and updates the client's billing email for next time.

The phone call was the turning point. Emails are easy to ignore; a short, friendly call usually surfaces the real problem.

Late fees and statutory interest

Whether you can add charges depends on your contract and local law. Our detailed guide to late payment fees covers how to set them up; here is the short version for statutory rights:

• United Kingdom: under the Late Payment of Commercial Debts (Interest) Act 1998, businesses can generally claim interest at 8% above the Bank of England base rate on late business-to-business payments, plus fixed compensation of £40, £70 or £100 depending on the debt size. This applies to sole traders too; see invoicing as a UK sole trader.
• European Union: the Late Payment Directive gives businesses a right to interest of at least 8 percentage points above the European Central Bank reference rate, plus a minimum of €40 compensation, implemented through each country's own law.
• United States: there is no general federal rule for business invoices. Late fees and interest depend on your contract and state law, including usury limits.

These rights usually apply to business customers, not consumers. Check the current rules or speak to an adviser before you claim.

What to say when you call about an overdue invoice

Calls feel awkward, but they resolve more overdue invoices than any email. Keep the call short, specific and friendly. A simple structure:

1. Identify yourself and the invoice: "Hi, this is Sam from Brightline Studio. I'm calling about invoice INV-2026-0144 for $3,200, which was due on 30 September."
2. Ask an open question: "Can you see it in your system, and is there anything holding it up?"
3. Solve what you can on the spot: resend the PDF, confirm the PO number, or give the bank details again.
4. Ask for a date: "When is your next payment run, and can this be included?"
5. Confirm in writing: send a two-line email the same day summarizing what was agreed.

Note who you spoke to, the date and what they promised. If the promised date passes, your next contact can refer to it directly, which is much harder to brush off than a generic reminder. Keep the same calm tone even on the third call; staying professional protects the relationship and makes your position stronger if the invoice ever goes further.

One security point: if someone at the client asks you to confirm or change bank details during a call they initiated, or by email, verify through a number you already have before sending anything. Fraudsters sometimes target suppliers chasing overdue payments, because the pressure to get paid lowers people's guard.

Payment plans and partial payments

If a client is struggling rather than refusing, a payment plan can recover more than a confrontation. Put any plan in writing with amounts and dates, and confirm that missing an instalment makes the full balance due. Issue a receipt for each payment and track what is left. A partial payment now is often worth more than a full payment that never comes.

When you agree a plan, decide in advance how any late fees or interest will be treated. Many businesses waive them as long as every instalment arrives on time, which gives the client a strong reason to stick to the schedule. Keep further work on hold, or on upfront payment terms, until the balance is cleared.

When to escalate

Escalation makes sense when the client stops responding, keeps missing promised dates, or disputes the invoice without a real reason. Your options, in rough order:

• Final notice stating the amount, the deadline and the action you will take next.
• Collection agency working for a fee on what it recovers. Our guide to sending an invoice to collections explains how it works.
• Demand letter from a lawyer, which often prompts payment on its own.
• Small claims court for smaller amounts, within your jurisdiction's limits.

For freelancer-specific tactics, including contract wording that helps next time, read what to do when a client is not paying an invoice.

Prevent the next overdue invoice

• Agree payment terms and late fees in writing before you start.
• Invoice immediately after delivery and use real due dates.
• Take deposits on large projects.
• Offer easy ways to pay, such as a card link alongside bank transfer.
• Review an accounts receivable aging report every week so nothing slips past 30 days unnoticed.

Resend your overdue invoice today

If your overdue invoice needs correcting or resending, rebuild it in the invoice generator, keep the original invoice number and dates, and choose a layout with a prominent amount due, such as the Bold invoice template. A clear, correct invoice is the fastest route to getting paid.