Dunning Emails: A Polite Sequence for Overdue Invoices
Chasing money is nobody's favorite job, so many owners put it off until a small overdue invoice becomes a big problem. Dunning emails solve that with a planned, polite sequence of reminders that goes out on a schedule. This guide shows you how to time each message, what to say, and how to stay firm while keeping the client relationship warm.
Key takeaways
- Dunning is the process of reminding customers about unpaid invoices in a planned series of steps.
- A good sequence starts before the due date, stays friendly at first and becomes clearer and firmer over time.
- Every message should include the invoice number, amount, due date and an easy way to pay.
- Decide your final steps in advance, such as pausing work or using a collections route, so you are not making it up under stress.
Most late payments are not dramatic. An invoice landed in the wrong inbox, a manager was on holiday, or the client simply forgot. A clear, kind reminder fixes most of these cases in a day or two. The trouble starts when reminders are irregular, vague or emotional, because then the client does not know what you expect or when.
Early March is a good moment to set this up. Many businesses are closing out the first quarter, and in the UK the tax year ends on 5 April, so tidying up overdue invoices now gives you a clearer picture of your cash and your books.
A quick note: this article is general information, not legal or financial advice. Rules on late fees, interest and debt collection vary by country, state and contract, so check with a qualified professional before charging fees or taking formal action.
What dunning means and why a sequence works
The word dunning simply means asking someone to pay a debt. In practice, it describes a set of reminders that move from gentle to firm as an invoice gets older. Software companies use dunning for failed card payments, but the same idea works for any business that sends invoices.
A sequence works for three reasons. First, it is consistent: every client gets the same treatment, so nobody feels singled out. Second, it removes emotion: you decide the wording once, when you are calm, instead of writing an angry email on a stressful Friday. Third, it creates a record: if you ever need to escalate, you can show exactly what you sent and when.
Pro tip
Write your payment terms on every quote, contract and invoice: the due date, accepted payment methods, and what happens if payment is late. Reminders are much easier when the client already agreed to the terms you are pointing to.
Set up before you send a single reminder
A dunning sequence only works if the basics are in place. Before you write any templates, check these items.
- Clear invoices. Each invoice has a unique number, issue date, due date, itemized work, total amount and your payment details.
- The right contact. Ask every new client who handles invoices. Often it is an accounts team, not the person you work with day to day.
- Simple payment options. The fewer steps it takes to pay, the faster you get paid. A payment link or clear bank details help.
- A tracking list. Use your invoicing tool or a simple spreadsheet to see what is due, overdue and paid, and when each reminder went out.
- Agreed terms. Make sure late fees or interest, if you plan to use them, are written into your contract or terms and allowed where you operate.
Many invoicing and accounting tools can send automatic reminders. Automation is helpful, but read the default wording first and replace anything that sounds robotic or harsher than you intend.
A polite dunning sequence, step by step
The timings below are a starting point. Adjust them to your payment terms and your clients. A sequence for 14-day terms may move faster than one for 30-day terms with a large corporate client.
- A few days before the due date: friendly heads-up. A short note that the invoice is due soon, with the amount and a payment link. This catches lost invoices before they become late.
- On the due date: gentle reminder. Let the client know the invoice is due today. Keep it light and assume good intent.
- About a week overdue: first follow-up. Note that the invoice is now overdue, attach it again and ask if anything is stopping payment, such as a missing purchase order number.
- About two weeks overdue: firmer reminder. State the overdue amount clearly, ask for a payment date, and mention your payment terms.
- About a month overdue: phone call and written notice. Call your contact or the accounts team, then follow up in writing. Explain the next steps if payment does not arrive, such as pausing work or applying agreed late fees.
- Final notice. Give a specific deadline and say exactly what will happen after it. Then follow through.
Common mistake
Threatening consequences you will not carry out. If your final notice says you will pause work or pass the debt to a collections service, be ready to do it. Empty warnings teach clients that your deadlines are optional.
Copyable dunning email templates
Here are templates for each stage. Replace the bracketed parts, and keep your own voice. Short and specific beats long and apologetic.
Before the due date
Subject: Invoice [number] due on [date]
Hi [name], just a friendly heads-up that invoice [number] for [amount] is due on [date]. You can pay here: [payment link or bank details]. Let me know if you need anything from me to process it. Thanks, [your name]
On the due date
Subject: Invoice [number] is due today
Hi [name], invoice [number] for [amount] is due today. I have attached a copy for easy reference. If it is already on its way, thank you, and please ignore this note. Best, [your name]
One week overdue
Subject: Overdue: invoice [number]
Hi [name], I have not yet received payment for invoice [number], which was due on [date]. Could you let me know when I can expect it? If there is anything holding it up, such as a missing PO number or a different billing contact, I am happy to help sort it out. Thanks, [your name]
Two weeks overdue
Subject: Second reminder: invoice [number], [amount] overdue
Hi [name], invoice [number] for [amount] is now two weeks overdue. Under our agreed terms, payment was due on [date]. Please confirm a payment date by [date]. If you would like to discuss a payment plan, reply and we can find something that works. Kind regards, [your name]
Final notice
Subject: Final notice: invoice [number]
Hi [name], despite earlier reminders on [dates], invoice [number] for [amount] remains unpaid. Please pay in full by [date]. If payment is not received by then, we will [pause work on your account / apply late fees as set out in our terms / refer the debt for collection]. I would much prefer to resolve this directly, so please call me on [number] if there is a problem. Regards, [your name]
A dunning schedule template you can copy
Keep a simple tracker so you always know which reminder comes next. Copy this table into a spreadsheet and add one row per overdue invoice. The clients and amounts are made up for illustration only.
| Invoice | Client | Amount (example) | Due date | Last reminder sent | Next step | Next step date |
|---|---|---|---|---|---|---|
| INV-1042 | Example Studio Ltd | £1,250 | 20 February | One week overdue | Two-week reminder | 6 March |
| INV-1047 | Sample Bakery Co | $680 | 1 March | Due date reminder | One-week follow-up | 8 March |
| INV-1031 | Demo Consulting | €3,400 | 31 January | Phone call and written notice | Final notice | 10 March |
Review this list at the same time each week. Ten minutes on a Monday morning is usually enough to send every reminder that is due.
Hypothetical example
Imagine Sam, a freelance copywriter whose invoices often went unpaid for weeks. Sam used to wait until money felt tight, then send an awkward email. After setting up the sequence above, Sam sends a heads-up three days before each due date and a reminder on the day. Most clients now pay on time, and the few who do not get a clear, friendly follow-up. The biggest change is that Sam no longer dreads chasing, because the words are already written.
Tone, timing and keeping the relationship
The goal is to get paid and keep a good client, so tone matters. A few habits help.
- Assume good intent at first. Early messages should sound like help, not blame. Most late payers are disorganized, not dishonest.
- Be specific. Always give the invoice number, amount and date. Vague emails are easy to ignore.
- Ask for a date. "When can I expect payment?" gets a clearer answer than "Please pay soon."
- Pick sensible send times. Weekday mornings tend to work better than late Friday evenings, when emails get buried.
- Pick up the phone. A short, friendly call often unlocks a payment that five emails could not.
- Offer options. If a client is struggling, a written payment plan can bring in money that would otherwise be lost.
Late fees and interest
Rules differ by country. In the UK, the Late Payment of Commercial Debts (Interest) Act lets businesses claim statutory interest on late B2B invoices, set at 8% above the Bank of England base rate. In the US, rules on late fees vary by state and by contract. Either way, state your terms clearly in advance and check the rules where you and your client operate.
When reminders are not enough
A small number of invoices will not be paid through reminders alone. Decide in advance what you will do, so the decision is not made in frustration. Common options include pausing further work, asking for upfront payment on future projects, using a formal letter before action, a collections agency, or a small claims process. Each has costs and rules that depend on where you are, so get advice before you start a formal route.
It is also worth looking at what caused the problem. If the same clients pay late every time, consider deposits, shorter terms or staged payments for them in future.
Your dunning setup checklist
- Put clear payment terms on every quote, contract and invoice
- Confirm the billing contact for each client
- Offer at least one simple, fast way to pay
- Set up a tracker for due and overdue invoices
- Write your templates for each stage of the sequence
- Turn on automatic reminders and edit the default wording
- Block 10 minutes each week to review and send reminders
- Decide your final steps and check the rules where you operate
Frequently asked questions
How many reminders should I send before taking further action?
Many businesses send 4 to 6 messages over about a month, including at least one phone call, before a final notice. Choose a number that fits your terms and your clients, and apply it consistently.
Should I automate dunning emails?
Automation is great for early reminders because it never forgets. For later stages, a personal message or phone call usually works better. Many owners automate the first two or three steps and handle the rest by hand.
Is it rude to send a reminder before the due date?
Not when it is short and friendly. A heads-up before the due date helps clients who lost the invoice or need it approved, and most appreciate it.
What if a client disputes the invoice?
Pause the sequence, listen to the concern and resolve the issue. If part of the invoice is not in dispute, ask for that part to be paid while you work out the rest.
Related reading
The bottom line
Dunning emails turn chasing payments from a dreaded chore into a simple routine. Set clear terms, write your templates once, send them on a steady schedule and keep the tone friendly but firm. Most clients will pay with just a nudge or two.
Set aside an hour this week to write your sequence and build your tracker. The next time an invoice slips, you will know exactly what to send and when.
