Dunning Process: Stages, Letters and Automation (2026)
The dunning process explained: the stages from friendly reminder to final notice, sample dunning letters, failed card payment recovery and how to automate it.
Quick answer: The dunning process is the planned sequence of reminders a business sends to collect overdue payments, moving from a friendly heads-up before the due date to firmer notices and finally a last warning before collections. Good dunning uses set stages, clear wording, a fixed timeline and automation for failed card payments.
Most late invoices are not unpaid because the customer refuses. They are late because the invoice was buried, the card expired or nobody owned the follow-up. A written dunning process fixes the last problem, and it is the cheapest cash flow tool a small business has. This guide explains what dunning means, the stages most businesses use, sample dunning letters for each stage, how failed payment recovery works for subscriptions, and the mistakes that cost you money or customers.
What is dunning?
Dunning is the methodical communication a creditor uses to collect money that is owed. The word has been used for centuries for pressing someone to pay a debt. Today it covers two related jobs:
- Invoice dunning: reminders for unpaid invoices sent to clients who pay by bank transfer, check or card, typical for freelancers, agencies, trades and B2B suppliers.
- Payment failure dunning: automatic retries and card update requests when a recurring card or direct debit payment fails, typical for subscriptions, memberships and SaaS.
Both are part of accounts receivable management. Your accounts receivable aging report tells you who is late, and the dunning process tells you what to do about each bucket. Dunning is not the same as collections: it is your own process for your own invoices, while collections usually means handing the debt to a third party.
What are the stages of the dunning process?
A typical dunning process has five or six stages. The tone starts helpful and becomes more formal, and each stage adds something new: a copy of the invoice, a fee, a deadline or a consequence.
| Stage | Timing | Tone | Main goal |
|---|---|---|---|
| 1. Pre-due reminder | 3 to 7 days before due date | Friendly, helpful | Make sure the invoice reached the right person |
| 2. Due-date notice | On the due date | Neutral | Prompt payment today with a payment link |
| 3. First overdue reminder | 3 to 7 days late | Polite but direct | Find out if something is wrong |
| 4. Second overdue reminder | 14 days late | Firm | Mention late fees and ask for a payment date |
| 5. Final notice | 30 days late | Formal | Set a deadline and state the next step |
| 6. Escalation | 45 to 90 days late | Formal, legal | Demand letter, collections or small claims |
Adjust the timing to your payment terms. A business on net 30 payment terms might send the pre-due reminder on day 25, while one that bills due upon receipt would skip straight to stage 2 or 3.
Stage 1: the pre-due reminder
This is the most underrated message in the sequence. It catches invoices sent to the wrong inbox, purchase order numbers that are missing and approvals that are stuck. It should be short and helpful, with the invoice attached again.
Stages 2 and 3: due and just overdue
Assume good faith. Most customers who pay a few days late simply forgot. Include the invoice number, amount, due date and a one-click payment option. If you add a payment link to the invoice, put the same link in every reminder.
Stages 4 and 5: firm and final
Now you name consequences: the late fee your terms allow, a pause on further work, and the date by which you need payment or a reply. The final notice before legal action should be the only message that mentions collections or court, and only if you are prepared to follow through.
Sample dunning letters for each stage
Copy and adapt these. Replace the bracketed fields with your own details, and keep the invoice attached or linked in every message.
Pre-due reminder
Subject: Invoice [number] due on [date]
Hi [Name], a quick reminder that invoice [number] for [amount] is due on [date]. I have attached a copy in case the first one went astray. You can pay by bank transfer or card using this link: [link]. Thanks, [Your name]
First overdue reminder
Subject: Invoice [number] is now [X] days overdue
Hi [Name], our records show invoice [number] for [amount] was due on [date] and is still open. If you have already paid, please ignore this note and accept our thanks. If something is holding it up, such as a missing PO number, just reply and I will sort it out today.
Second overdue reminder
Subject: Second reminder: invoice [number], [amount] overdue
Hi [Name], invoice [number] is now 14 days past due. As set out in our payment terms, a late fee of [amount or rate] applies from [date]. Please let me know by [date] when we can expect payment. If cash flow is the issue, I am happy to discuss a short payment plan.
Final notice
Subject: Final notice: invoice [number] overdue since [date]
Dear [Name], despite earlier reminders on [dates], invoice [number] for [amount], plus [late fee], remains unpaid. Please pay the full balance of [total] by [date, usually 7 to 10 days away]. If we do not receive payment or a reply by then, we will refer the account to [collection agency or our solicitor] without further notice.
For more wording options, see our full set of payment reminder email templates.
How does dunning work for failed card payments?
Subscription businesses face a different problem: the customer wants to keep paying, but the card fails. Common reasons include an expired card, a replaced card after fraud, insufficient funds or a bank's fraud filter. Dunning for failed payments usually combines three tools:
- Smart retries: the billing system retries the charge on a schedule, such as day 1, day 3, day 5 and day 7, often timed around common paydays. Several processors, including Stripe, offer automatic retry logic.
- Card updater services: Visa and Mastercard run updater programs that can pass new card numbers and expiry dates to merchants who are enrolled through their processor, so some failures never happen.
- Customer emails with an update link: a short message with a secure link to a hosted page where the customer enters a new card, sent after the first failure and repeated before access is paused.
Set a grace period before you suspend service, and make the final message clear about what happens next: paused account, read-only access or cancellation. If you sell recurring payments to small business customers, offering ACH or direct debit as a backup method also reduces failures, because bank accounts do not expire the way cards do.
Worked example: a dunning schedule with real numbers
Maria runs a small bookkeeping firm. She issues invoice INV-2026-0418 for $1,450 on October 1, 2026, on net 30 terms, so it is due October 31. Her terms allow a late fee of 1.5% per month on balances more than 15 days overdue (check that any rate you use is allowed in your state).
| Date | Dunning step | Balance shown |
|---|---|---|
| Oct 26 | Pre-due reminder with invoice attached | $1,450.00 |
| Oct 31 | Due-date notice with payment link | $1,450.00 |
| Nov 6 | First overdue reminder | $1,450.00 |
| Nov 16 | Second reminder, late fee applied ($1,450 x 1.5%) | $1,471.75 |
| Nov 30 | Final notice, deadline Dec 10 | $1,471.75 |
| Dec 11 | Demand letter or collections | $1,471.75 plus any further agreed fees |
In practice, Maria's client replies to the first overdue reminder: the invoice went to a former employee. She resends it to the accounts payable inbox and is paid on November 9. The pre-due and first overdue messages did the work, which is typical. You can set out a clean, numbered invoice like this one in our free invoice generator and attach it to each message.
How to set up a dunning process step by step
- Write down your payment terms. Due dates, accepted methods, late fees and interest must be agreed before work starts and printed on every invoice. Our guide to late payment fees covers what is usually allowed.
- Choose your stages and dates. Use the table above as a starting point and adjust for your terms and customer type.
- Write templates for each stage. Keep each one short, with the invoice number, amount, due date and payment link in the first lines.
- Decide who sends what. Automated messages for early stages, a named person for the second reminder and final notice.
- Automate where you can. Most invoicing software can send scheduled reminders. For card subscriptions, turn on retries and card update emails.
- Log every contact. Note dates, replies and promises to pay. This record matters if you later escalate to a demand letter or court.
- Review monthly. Look at which stage most payments arrive after, and which customers always reach stage 4. Change terms or require deposits for repeat late payers.
Dunning for B2B clients versus consumers
Business customers usually have an accounts payable process. Your reminders should help that process: include the PO number, the supplier name exactly as it appears in their system, and remittance details. Asking "Has this been approved for payment?" is often more useful than repeating the amount.
Consumer customers need simpler messages and more care. In the US, the Fair Debt Collection Practices Act applies mainly to third-party collectors of consumer debts, but some state laws also cover businesses collecting their own debts. Avoid threats you cannot carry out, contact at unreasonable hours and discussing the debt with anyone other than the customer. This is general information, not legal advice.
Common dunning mistakes
- No pre-due reminder. You lose the cheapest chance to fix a wrong address or missing PO.
- Escalating too fast. Threatening collections on day 3 damages relationships with clients who simply forgot.
- Escalating too slowly. Waiting 60 days before the first reminder tells the customer your invoice is low priority.
- Fees that were never agreed. A late fee that first appears in a reminder is likely to be disputed.
- Missing details. Every message should restate the invoice number, amount, due date and how to pay.
- Ignoring replies. A customer raising an invoice dispute needs an answer, not the next automated reminder.
- Forgetting to say thank you. When payment arrives, confirm it. A short thank you for your payment message closes the loop and stops further reminders going out by mistake.
Which dunning metrics should you track?
A dunning process improves when you measure it. You do not need special software: a column in your receivables spreadsheet for the stage each invoice reached is enough to start.
| Metric | How to calculate it | What it tells you |
|---|---|---|
| Paid by stage | Share of overdue invoices paid after each reminder | Which messages work and which can be cut |
| Average days late | Payment date minus due date, averaged | Whether your terms or reminders need changing |
| Recovery rate on failed cards | Recovered failed payments divided by all failed payments | How well retries and update emails work |
| Days sales outstanding | Receivables divided by credit sales, times days in period | Overall collection speed; see days sales outstanding |
| Write-offs | Total balances written off per quarter | Whether escalation starts early enough |
If most late invoices are paid after the first overdue reminder, your process is working and you mainly need to keep it consistent. If many reach the final notice, look upstream: deposits, shorter terms, clearer invoices or a credit check for new customers usually help more than harsher wording.
When dunning is not enough
If the final notice deadline passes, choose the next step based on the amount and your evidence. For larger sums, a formal demand letter for payment is often the turning point. After that, you can use a collection agency for unpaid invoices or small claims court. If the debt is truly uncollectible, record it as a bad debt so your books and taxes reflect reality.
A consistent dunning process works best when the original invoice is clear, so the customer never has a reason to delay. Create professional invoices with due dates, terms and payment details in our free invoice generator: it needs no sign-up and downloads a PDF straight from your browser, ready to attach to every stage of your dunning process.
Frequently asked questions
What does dunning mean in accounts receivable?
In accounts receivable, dunning means the organized series of reminders a business sends to collect money it is already owed. It starts with a polite notice before or on the due date and escalates in tone and consequence if the customer does not pay. The word is old, but the practice is current: almost every subscription company and many service firms run some form of dunning, whether by hand or with software.
How many dunning emails should I send?
Most small businesses use four to six messages over 30 to 45 days: a pre-due reminder, a due-date notice, two or three overdue reminders and a final notice. Fewer than that and customers who simply forgot slip through. Many more than that and the messages start to look like spam and lose their effect. What matters most is that each message adds new information, such as a fee, a deadline or a next step.
Is dunning the same as debt collection?
No. Dunning is the creditor's own reminder process for its own invoices, usually while the customer relationship is still active. Debt collection usually refers to later steps, often by a collection agency or lawyer, once the account is seriously overdue. Third-party collectors chasing consumer debts in the US are covered by the Fair Debt Collection Practices Act, while a business reminding its own customers is generally not, though state laws can still apply.
What is involuntary churn and how does dunning reduce it?
Involuntary churn is when a subscriber is lost because a payment fails, not because they chose to cancel. Expired cards, insufficient funds and bank declines are common causes. Dunning reduces it by retrying the charge on sensible days, using card updater services where available, and emailing the customer a secure link to update their card before access is cut off. Recovering even a share of failed payments protects revenue you already earned.
When should I stop dunning and send an account to collections?
Many businesses set a cut-off between 60 and 90 days past due, after a final notice with a clear deadline has gone unanswered. Before that, check the invoice was received, that there is no dispute and that the amount justifies the cost. Collection agencies usually keep a percentage of what they recover, so for small balances a demand letter or small claims court may be the better next step.
Should dunning messages come from a person or a system address?
Early, friendly reminders can come from a billing address, which keeps things neutral. Later stages work better from a named person, such as the owner or the account manager, because customers are more likely to reply to a person and explain a problem. Whatever the sender, make sure replies reach someone who reads them, because a customer explaining a dispute to an unmonitored inbox will only get angrier.
Can I charge a fee as part of the dunning process?
Yes, if your contract or invoice terms allowed it before the work was done, and the amount complies with state law. A late fee or monthly interest charge should appear in your payment terms, on the original invoice and again in the dunning message where it is first applied. Adding a fee that was never agreed invites disputes and, in some states, can break consumer protection rules.
Do I need dunning software?
Not at the start. A spreadsheet of open invoices, a calendar and a set of saved email templates can run a solid dunning process for a few dozen customers. Software becomes worth it when you have many recurring card payments, because automatic retries and card update links recover failed payments that manual follow-up would miss. Many invoicing and subscription billing tools include reminders at no extra cost.
Invoice Creator Editorial Team
Guides on invoicing, cash flow and small-business finance from Invoice Creator, operated by Next Software Development Company. Content is reviewed for accuracy against the fields our own invoice generator produces.
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