Summary
A payment reminder email names the invoice number, amount and due date in the subject line, opens with a one-line reminder, and gives a direct payment link. The tone climbs from friendly before the due date to a firm final demand at 30 days overdue. The 12 templates below cover every step, as emails and as posted letters.
- Subject line: Lead with the invoice number and status, for example 'Reminder: invoice #1234 is due on 14 July', so the reader can act from the inbox preview alone.
- Timing ladder: Send a pre-due nudge 3 to 5 days before the due date, a note on the due date, then follow-ups at roughly 3, 7, 14 and 30 days overdue.
- The fix for consistency: Paidnice sends every reminder on schedule for Xero and QuickBooks businesses, and that consistency is why customers see half as many late invoices in the first 30 days.
The ladder below runs from a friendly pre-due reminder to a strong letter for outstanding payment, with the tone rules, the timing, and what you can legally add to an overdue invoice. Reminders work best when they sit on top of clear payment terms up front. It also helps to check how a large customer pays before you chase them, so you know what to expect.
When should I send the first payment reminder?
Send the first payment reminder 3 to 5 days before the invoice is due, not after it is overdue. A pre-due note catches the invoice that never reached accounts payable, the PDF sitting in a busy inbox, and the approval stuck on someone's desk, before any of them costs a day of cash.
After that, one reminder on the due date, then follow-ups at roughly 3, 7, 14 and 30 days overdue. Four to six touches in total. A late invoice is rarely a refusal to pay, so the early reminders stay friendly and the tone only turns firm once two or three have gone unanswered. Once email stops working, a posted overdue payment letter and then a final demand carry more weight than a tenth email.
What does each step of a reminder ladder do?
Our analysis of invoice data from over 1,000 Paidnice customers shows what each step of a reminder ladder does:
| Question | What our data shows | What to do |
|---|---|---|
| Will the customer pay on the due date? | Only about 13% of paid invoices are paid on the due date itself. More arrive in the week after it (about 19%). | Send a reminder 3 to 5 days before the due date. |
| Does an overdue reminder work? | On the day an overdue reminder goes out, about 12% of those invoices get paid. With no reminder, only about 4% do. | Send the first overdue reminder the day after the due date. |
| How many follow-ups does it take? | An overdue invoice takes 2 to 3 follow-ups on average to get paid. 8 in 10 are paid by the fourth follow-up. | Plan four follow-ups after the due date before you escalate to a posted letter. |
| Do later reminders still help? | Yes. 45% of overdue invoices get paid within 7 days of a first reminder, and 26% with no reminder. For a second reminder it is 39% and 26%, and for the 3rd to 8th it is 28% to 33% and 21% to 26%. | Keep the ladder running. Do not stop after one reminder. |
| Which day should a reminder go? | 35% of overdue reminders sent on Monday or Tuesday are paid within 3 days, and 25% of those sent Wednesday to Friday. Inside the same business the gap is about 6 percentage points. | Schedule overdue reminders for Monday or Tuesday where you can. |
How we measured this Original data
- Each reminder is compared with overdue invoices on the same number of days overdue that got no reminder.
- Some invoices without a reminder are held back from chasing on purpose, so read the first row as a strong short-term response.
- Part of the Monday gap comes from the weekend, which a Thursday reminder must wait through.
- Each figure is released with its full method: when customers actually pay, our reminder data, how many reminders it takes, whether each reminder still helps and the best day to send.
How to write a payment reminder email
A payment reminder email states the invoice number, the amount and the due date in its first two sentences, gives a direct payment link, and asks for one clear action by one clear date. Five principles:
- 1
Open warmly
A friendly first line keeps the relationship intact, especially early on.
- 2
State the point quickly
Name the invoice, the amount, and the due date in the first two sentences.
- 3
Remove friction
Add a direct payment link so paying takes seconds, not a login hunt.
- 4
Give one clear next step
Tell the reader exactly what to do and by when.
- 5
Leave the door open
Invite a reply if there's a query or a problem, so a silent delay becomes a conversation.
The templates below put these into practice. Copy the one that matches where the invoice sits, fill in the brackets, and send.
Copy-and-paste payment reminder templates
Twelve ready-to-use emails and letters, from a friendly pre-due nudge to a strong final demand. Fill in the brackets, copy, and send.
1. Pre-due reminder (email)
Send 3-5 days before the due dateSubject: Reminder: invoice #[Invoice Number] is due on [Due Date] Hi [Client's Name], Just a friendly reminder that invoice #[Invoice Number] for [Amount] is due on [Due Date]. You can view and pay it here: [Payment Link] If anything looks off or you have a question, reply to this email and we'll sort it out. Thanks, [Your Name], [Your Company]
2. Due-date reminder (email)
Send on the due dateSubject: Invoice #[Invoice Number] is due today Hi [Client's Name], A quick note that invoice #[Invoice Number] for [Amount] is due today, [Due Date]. You can pay it in a moment here: [Payment Link] If you've already sent payment, thank you, and please ignore this note. Best, [Your Name], [Your Company]
3. Polite overdue reminder (email)
Send 1-3 days overdueSubject: Invoice #[Invoice Number] is now overdue Hi [Client's Name], Our records show invoice #[Invoice Number] for [Amount], due on [Due Date], is now a few days overdue. We know these things slip through, so this is just a gentle nudge. You can settle it here: [Payment Link] If there's a problem with the invoice or the timing, let us know and we'll be glad to help. Best regards, [Your Name], [Your Company]
4. Payment follow-up email
Send 5-7 days overdueSubject: Following up on invoice #[Invoice Number] Hi [Client's Name], I'm following up on invoice #[Invoice Number] for [Amount], which was due on [Due Date] and is still showing as unpaid. Could you confirm when we can expect payment? You can also pay straight away here: [Payment Link] If it has already been actioned, apologies for the duplicate note. Happy to help if anything is holding it up. Best regards, [Your Name], [Your Company]
5. Firm overdue reminder (email)
Send 14-21 days overdueSubject: Action needed: invoice #[Invoice Number] is 14 days overdue Hi [Client's Name], Despite our earlier reminders, invoice #[Invoice Number] for [Amount], due on [Due Date], remains unpaid and is now 14 days overdue. Please arrange payment within 7 days using the link below: [Payment Link] If there is a reason for the delay, please reply today so we can agree a way forward. We'd like to resolve this without it affecting our working relationship. Best regards, [Your Name], [Your Company]
6. Final notice (email)
Send 30+ days overdueSubject: Final notice: invoice #[Invoice Number] is now [Days] days overdue Hi [Client's Name], This is a final reminder that invoice #[Invoice Number] for [Amount] is now [Days] days overdue. We have not received payment or a response to our previous emails. Please pay the full amount within 7 days, by [Final Date], using this link: [Payment Link] If payment is not received by then, the account may be passed to collections and a late fee or statutory interest may be applied. We would much rather settle this directly with you, so please get in touch if there is an issue. Best regards, [Your Name], [Your Company]
7. Overdue payment letter (formal)
Posted letter, 14-30 days overdue[Your Company] [Your Address] [Email] · [Phone] [Date] [Client's Name] [Client's Company] [Client's Address] Dear [Client's Name], Re: Overdue invoice #[Invoice Number] We are writing regarding invoice #[Invoice Number] for [Amount], issued on [Invoice Date] and due for payment on [Due Date]. As at the date of this letter, payment remains outstanding. We would be grateful if you could arrange payment of the full amount within 7 days of receiving this letter. Payment can be made by [Payment Method], quoting invoice #[Invoice Number] as the reference. If you have already made this payment, please accept our thanks and disregard this letter. If there is a query or difficulty, please contact us on [Phone] or [Email] so we can help resolve it. Yours sincerely, [Your Name] [Your Title], [Your Company]
8. Strong letter for outstanding payment (final demand)
Posted letter, 30+ days overdue[Your Company] [Your Address] [Email] · [Phone] [Date] [Client's Name] [Client's Company] [Client's Address] Dear [Client's Name], Re: Final demand for payment of invoice #[Invoice Number] Despite our previous reminders, invoice #[Invoice Number] for [Amount], due on [Due Date], remains unpaid and is now [Days] days overdue. This letter is a formal final demand for payment of the full outstanding balance of [Amount]. Please make payment in full by [Final Date], a period of [Number] days from the date of this letter, to [Payment Method] quoting reference #[Invoice Number]. If payment is not received by that date, we reserve the right to: - apply late payment fees and statutory interest on the overdue amount; - refer the debt to a collections agency; and - commence recovery proceedings to recover the sum due, together with interest and costs. We would prefer to resolve this matter directly and amicably. If you are experiencing difficulty or believe this amount is not due, please contact us in writing within [Number] days so we can discuss it. Yours sincerely, [Your Name] [Your Title], [Your Company]
9. Partial payment reminder (email)
When a part-payment is receivedSubject: Balance due on invoice #[Invoice Number] Hi [Client's Name], Thank you for your part-payment of [Partial Amount] towards invoice #[Invoice Number]. A balance of [Remaining Amount] is still outstanding. You can clear the remaining balance here: [Payment Link] Please let us know if you'd like to arrange a short payment plan for the rest. We're happy to help. Best regards, [Your Name], [Your Company]
10. Payment received confirmation (email)
As soon as payment arrivesSubject: Payment received for invoice #[Invoice Number] Hi [Client's Name], Thank you, we've received your payment for invoice #[Invoice Number]. For your records: Invoice: #[Invoice Number] Amount paid: [Amount] Date received: [Date] We appreciate your business and look forward to working with you again. Best regards, [Your Name], [Your Company]
11. Thank-you for on-time payment (email)
When paid on or before the due dateSubject: Thank you for your prompt payment Hi [Client's Name], Thank you for paying invoice #[Invoice Number] on time. We really appreciate it, prompt payment helps us keep doing our best work for you. If there's anything we can help with, just let us know. Best regards, [Your Name], [Your Company]
12. Short payment follow-up (SMS or quick email)
A one-line nudge any time after dueHi [Client's Name], a quick reminder that invoice #[Invoice Number] for [Amount] is now overdue. You can pay it here: [Payment Link]. Thanks, [Your Company].
Looking for a system to automate these?
Copying templates works, but sending the right one on time for every invoice is the hard part. Paidnice runs the whole sequence for you:
- Reminders sent automatically before and after the due date
- Late fees and interest applied the moment an invoice is overdue
- The firmer accounts escalated with a formal letter
- Every message from your own domain, on your schedule
Works with Xero and QuickBooks, across email, SMS and letters.
Try Paidnice for free
How do I write a strong letter for outstanding payment?
A strong letter for outstanding payment, also called a final demand, states the invoice number, amount and due date, notes that earlier reminders went unanswered, and demands the full balance by a firm date 7 to 14 days out. It is the step that follows unanswered polite reminders and follow-up emails, usually sent by post or as a formal PDF attachment, which signals that the matter is now serious. A final demand letter of demand should still be professional, never threatening, and it should:
- Reference the invoice and history. State the invoice number, amount, original due date, and that earlier reminders went unanswered.
- Make a clear demand. Ask for the full outstanding amount, not a part-payment.
- Set a firm deadline. Give a specific final date, commonly 7 to 14 days from the letter.
- Explain what happens next. Note that you may apply late fees or statutory interest, refer the debt to collections, or begin recovery proceedings if payment is not received.
- Offer a way out. Invite the customer to get in touch if they are in difficulty or dispute the amount.
You'll find a ready-to-use strong letter for outstanding payment and a formal overdue payment letter in the template library above, under the Letters filter. Paste either into your letterhead, fill in the brackets, and save it as a PDF or Word document to send.
Should I send an overdue payment letter or an email?
Send email reminders first, from the pre-due nudge to about 30 days overdue, and switch to a posted overdue payment letter once email has gone unanswered or you are heading toward a formal demand. Here is when each one wins:
| Email reminder | Posted letter | |
|---|---|---|
| Best for | The first reminders, from pre-due to about 30 days overdue | A formal final demand, or when emails are ignored |
| Speed | Instant, easy to automate and track | Slow, but creates a paper trail |
| Tone signal | Routine follow-up | This is now serious |
| Cost and effort | Effectively free | Postage and time |
| When to use it | Invoice 0 to about 30 days overdue, customer still responsive | 30+ days overdue, no email response, or before legal action |
A formal overdue payment letter, followed by a final demand, shows you have acted reasonably and given fair warning, which matters if the debt is ever disputed.
What can I legally add to an overdue invoice?
An overdue invoice can carry a late payment fee where your payment terms allow one, and statutory interest where the law provides it, such as the Bank of England base rate plus 8% on UK commercial invoices. Two common additions:
- Late payment fees, where your terms allow them. Our guide on how much you can charge in late fees covers the limits.
- Statutory interest. In the UK, businesses can charge interest at the Bank of England base rate plus 8% on overdue commercial invoices. Work out the figure with our UK statutory interest calculator, or use the late payment interest calculator for other situations.
State any fee or interest clearly in your terms and on the invoice, so it is fair and expected rather than a surprise.
What mistakes cost you money when you send reminder templates?
Three habits make a good template collect less.
Saving the firm templates for 30 days overdue. Of invoices 7 days overdue, 1 in 5 is still unpaid 180 days after the due date. At 30 days overdue it is 2 in 5, and at 90 days 3 in 4. Fix: send template 3 at 1 to 3 days overdue and template 4 at 5 to 7 days.
Source: our analysis of invoice data from over 1,000 Paidnice customers. See when an overdue invoice becomes bad debt.
Sending a one-invoice template to a customer with several overdue. 47% of overdue invoices from a customer with nothing else overdue get paid within a week of a reminder, and 21% without one. If the customer has 4 or more overdue invoices, it is 24% with a reminder and 22% without.
Fix: send one statement that lists every open invoice, or phone them.
Source: our analysis of invoice data from over 1,000 Paidnice customers. See when reminders stop working.
Keeping on sending to an address that bounces. When a reminder bounces, the invoice is twice as likely to be unpaid 75 days after its due date (about 13%, against 6%). Fix: when a reminder bounces, get a working address by phone, or send template 7 as a posted letter.
Source: our analysis of invoice data from over 1,000 Paidnice customers. See warning signs of a late payer.
What if the customer still does not pay?
When the full ladder of reminders and a final demand bring no response, pause new work for that customer, phone them, and then choose between a collections agency, small claims, or a write-off. In that order:
- Pause new work for that customer until the account is settled.
- Make a phone call. A direct conversation often unlocks a payment that emails could not.
- Consider a collections agency. Choose one that treats your customer respectfully, since it reflects on you.
- Take legal advice before issuing proceedings, to weigh the cost against the amount owed.
Most invoices never reach this point if the earlier reminders are consistent and on time.
Be realistic about the end of the road. Reminders and a final demand resolve the large majority of overdue invoices, but not all of them. Past a certain point, an email is not the tool; the choice becomes a collections agency, small claims, or accepting the write-off. And for a genuinely small balance, the answer is that your time is worth more than the effort of collecting it. Knowing when to stop is part of running accounts receivable (AR) well.
For the native-versus-app decision, see Xero invoice reminders vs a credit control app: what changes.
Payment reminder FAQs
A strong letter for outstanding payment, often called a final demand, should reference the invoice number, amount, and original due date, note that earlier reminders went unanswered, and demand the full amount by a firm deadline (usually 7 to 14 days). State clearly what happens next if payment is not received, such as late fees, statutory interest, collections, or recovery proceedings, and offer the customer a chance to get in touch if they are in difficulty. Keep it professional and factual, never threatening. There is a ready-to-use template in the library above under the Letters filter.
An email reminder is fast, links straight to payment, and is right for the first several follow-ups. A posted overdue payment letter carries more weight and creates a formal paper trail, which is useful for larger amounts, for accounts that are ignoring email, and before involving a collections agency or taking legal steps. Many businesses use emails first, then escalate to a formal letter and a final demand.
Send one reminder before the due date and three to four after it across the first 30 days, then escalate: a pre-due reminder 3 to 5 days before the due date, a note on the due date, then follow-ups at roughly day 7, day 14 and day 21 to 30. If there is still no response after about 30 days, move to a statement, the late fee and a final demand, and consider collections after 60 days. The invoice escalation ladder sets out each rung by day.
Make each reminder self-contained: the invoice number, the amount due, the original due date (or how many days overdue it is), a direct payment link or clear instructions, and your contact details. That way the customer can act without digging through old emails.
Open warmly, name the invoice, amount and due date in the first couple of sentences, and ask a simple question such as when payment can be expected. Add a payment link, assume good faith ("apologies if this has already been actioned"), and invite a reply if something is holding it up. The payment follow-up template above follows this structure.
Send a final demand once your earlier reminders and follow-ups have gone unanswered, typically around 30 or more days overdue. It should be the last step before collections or legal action, give a firm final deadline, and set out the consequences of non-payment clearly.
Often yes, where your terms allow. In the UK, businesses can charge statutory interest at the Bank of England base rate plus 8% on overdue commercial invoices; you can work out the amount with the UK statutory interest calculator. For other situations, use the late payment interest calculator. State any fee or interest in your terms so it is fair and expected.
Both, in sequence. Be friendly before and just after the due date, professional in the first week or two overdue, firmer beyond that, and reserve a formal final tone for 30+ days. Even firm reminders should stick to facts and next steps rather than emotion, and avoid anything that reads as a threat.
Yes, and it is the most reliable way to stay consistent. Tools like Paidnice connect to Xero and QuickBooks and send your reminders on schedule, apply late fees automatically, and escalate overdue accounts, so the right message goes out at the right time without manual effort.
Mid-week mornings tend to work best. Aim for Tuesday to Thursday, around 10 to 11am or early afternoon in the customer's time zone, and avoid weekends, holidays, and very early or late hours when emails are easy to miss.
How do I automate payment reminders?
Payment reminders are automated by connecting dunning software to your accounting system, so each invoice gets the right template on the right day without anyone watching the ledger. Paidnice automates the whole sequence for businesses on Xero and QuickBooks: it sends your email and SMS reminders on schedule, applies late fees and interest when an invoice goes overdue, and escalates the few accounts that need a firmer touch, so you can stay consistent without living in your outbox.
“It's the debt collection system I've been looking for, for the last 15 years.”
Free to start. Connects to Xero and QuickBooks in minutes.
Paidnice features in this article
About the editorial team
Denym started Paidnice in 2022 after customers paying late left his own business short on payroll. He has led it to $1 billion collected on time across more than 1 million invoices, and writes about credit control, late fees and getting paid on Xero and QuickBooks.
App of the Year