When is an invoice considered overdue?

An invoice is overdue the day after its due date passes without payment. If the invoice says Net 30 and was issued on June 1, it becomes overdue on July 2. Invoices without a stated due date are harder to enforce always set one.

How do I ask for payment on an overdue invoice politely?

Send a short, friendly email that assumes good faith: reference the invoice number and amount, attach the invoice again, and ask if anything is blocking payment. Most late payments are oversights, and a polite first reminder resolves the majority of them.

Can I charge interest or a late fee on overdue invoices?

Yes, in most countries if the late fee was disclosed on the invoice or in your agreement before the work was done. A typical rate is 1–2% of the invoice amount per month. In the UK, statutory interest of 8% plus the Bank of England base rate applies to late B2B payments.

What should I do if a client never pays an invoice?

Escalate in stages: a final demand letter giving 7 days notice, then a collections agency or small-claims court depending on the amount. Keep every invoice, reminder, and reply a clear paper trail is what wins disputes.

Overdue Invoice? How to Follow Up Politely (With Email Templates)

Getting Paid · 7 min read · Updated June 2026

The short answer: an invoice is overdue the day after its due date passes unpaid. The fix is rarely confrontation it's a calm, consistent reminder sequence: a friendly nudge at 1–3 days overdue, a firmer follow-up at 1–2 weeks, a phone call at 3 weeks, and a final demand at 30 days. Most overdue invoices are paid after the first or second polite reminder.

Why invoices go unpaid (it's usually not malice)

Industry surveys consistently find that the majority of late B2B payments come down to process, not refusal: the invoice went to the wrong inbox, it was missing a PO number, the approver was on leave, or the due date was never clear. That's why your first reminder should assume good faith and why prevention starts with the invoice itself. A complete, clearly dated invoice (see what to include on an invoice) with explicit payment terms gets paid faster.

The overdue invoice follow-up timeline

Day 1–3 overdue friendly nudge. Short email, invoice re-attached, no pressure.
Day 7–14 firm reminder. Restate the amount, the original due date, and ask for a payment date.
Day 21 pick up the phone. A two-minute call moves more stuck invoices than five emails.
Day 30 final notice. State the late fee (if disclosed), and the next step if unpaid in 7 days.
Day 45+ escalate. Collections agency or small-claims court, depending on the amount.

Overdue invoice email templates (copy & paste)

Template 1 friendly first reminder (1–3 days overdue)

Subject: Invoice #1042 quick reminder

Hi [Name],

Just a friendly note that invoice #1042 for $1,250 was due on [date] I've re-attached it here for convenience. If it's already on its way, please ignore this!

Is there anything you need from me to process it?

Thanks,
[Your name]

Template 2 firm follow-up (1–2 weeks overdue)

Subject: Invoice #1042 now 14 days overdue

Hi [Name],

Following up on invoice #1042 for $1,250, due [date] and now two weeks overdue. Could you confirm when payment will be made?

If there's an issue with the invoice or the work, tell me and I'll resolve it straight away.

Best regards,
[Your name]

Template 3 final notice (30 days overdue)

Subject: FINAL NOTICE Invoice #1042, 30 days overdue

Hi [Name],

Invoice #1042 for $1,250 is now 30 days past due despite previous reminders. As stated on the invoice, a late fee of 1.5% per month now applies.

Please arrange payment within 7 days. If I don't receive payment or a response by [date], I'll have to pass this to a collections service which I'd much rather avoid.

Regards,
[Your name]

Can you charge late fees or interest?

Yes if you disclosed it up front. A late fee that first appears on a final notice is hard to enforce; one printed on every invoice ("1.5% monthly late fee on overdue balances") generally is. Typical rates run 1–2% per month. In the UK, the Late Payment of Commercial Debts Act adds statutory interest (8% + base rate) on overdue B2B invoices even without a contract clause. Put the late-fee line in the Terms field of every invoice you send it takes ten seconds in the simple invoice generator.

Prevention: five habits that stop invoices going overdue

Invoice immediately every day between delivery and invoicing adds days to payment.
Use clear due dates "Due July 15, 2026", not just "Net 30".
Number invoices properly missing or duplicate numbers stall approval. Use sequential numbering (our invoice number generator handles the format).
Confirm receipt a one-line "did this reach the right inbox?" catches routing failures a month early.
Track status know what's pending vs paid at a glance. A free Banana Invoice account includes payment tracking and a dashboard.

Frequently asked questions

When is an invoice legally overdue?

The day after the stated due date. If no due date was stated, many jurisdictions apply a default reasonable period (often 30 days from receipt) but relying on defaults makes enforcement slower. Always print a due date.

How many reminders should I send before escalating?

Three written reminders plus one phone call over roughly 30–45 days is the standard sequence. It demonstrates reasonableness if the dispute ever reaches court, and it resolves the vast majority of cases before escalation.

Should I stop working for a client with overdue invoices?

Pause new work once an invoice passes 30 days overdue. Continuing to deliver while unpaid weakens your leverage and increases your exposure and a paused project is often what finally gets finance to act.