How to use these
Read them once, then rewrite them in your own words. A template you paste unchanged sounds like a template, and clients recognise the genre immediately — the giveaway is usually a subject line with the word friendly in it.
What is worth keeping is the structure. Each message is under eighty words, opens with the invoice number and amount, and closes with a question. Everything else is yours.
The five messages
Plain markdown, no branding, no tracking. Placeholders are in {curly braces} so a find-and-replace does most of the work.
# Overdue invoice ladder
Placeholders: {invoice}, {amount}, {due_date}, {client}, {name}, {terms}, {rate}, {date}
---
## 1 — Three days before due
**Subject:** {invoice} — due {due_date}
Hi {name},
Invoice {invoice} for {amount} is due on {due_date}. Attaching it again so it is
near the top of your inbox.
Anything you need from me before then?
---
## 2 — One day late
**Subject:** {invoice} ({amount}) — due yesterdayoverdue-invoice-emails.md · markdown · 1.8 kB
- 1.Replace the placeholders once per client and save the result as a draft, so sending is a decision you make in one second rather than a paragraph you write in ten minutes.
- 2.Keep the subject lines. Threading matters: five messages in one thread reads as a record, five separate threads read as nagging.
- 3.Delete message one for clients who have never been late. It is the only one that can feel presumptuous.
Same message, two ways
The left column is what most people send. The right is the same content with the four edits that matter.
| Element | Usual version | Better version | Why |
|---|---|---|---|
| Subject | Friendly reminder | INV-214 ($2,400) — due yesterday | Finance teams search by number. So do you, in three weeks. |
| Opening | Sorry to chase, but… | Invoice 214 was due on the 3rd. | The apology concedes that asking is rude. |
| Middle | I know things get busy! | Attached again in case it needs re-uploading. | One removes friction, the other removes urgency. |
| Close | At your earliest convenience. | Can you let me know when it is scheduled? | A question has to be answered or deliberately ignored. |
| Sign-off | Thanks so much!! | Thanks, | Exclamation marks scale inversely with authority. |
Why these are short
Length is the tell
A long payment reminder is a nervous one. The extra sentences are almost always doing emotional work — explaining why you are writing, softening the ask, pre-empting an objection nobody made — and every one of them gives the reader somewhere to look other than the question at the end.
There is a practical reason too. Messages three, four and five are increasingly likely to be forwarded, and a forwarded message gets skimmed by someone who was not part of the original conversation and has no context for your tone. Eighty words survive a forward. Three hundred do not; they get summarised in the covering line as the designer is chasing again, which is a much worse version of what you wrote.
The last message is the one people most want to lengthen, because it is the one that feels like it needs justification. It needs the opposite. A final notice that states the date, the consequence and the question is read as a decision already made. The same content with two paragraphs of regret around it is read as an opening position.
Subject lines, ranked by what they do to a triage list
Not tested at scale — this is reasoning about how an accounts-payable inbox is processed, not an experiment. Judge it on whether the reasoning holds.
| Subject line | What happens in the list view | Verdict |
|---|---|---|
| Friendly reminder | No number, no amount, no date. Nothing to file it against. | Worst |
| Invoice attached | Indistinguishable from the original send. Gets threaded and lost. | Poor |
| Following up on my invoice | Reads as a person with a feeling rather than a document with a due date. | Poor |
| INV-214 — due 3 Sept | Number first, date second. Filable without opening. | Good |
| INV-214 ($2,400) — due yesterday | Adds the amount, which decides its position in a payment run. | Best |
| INV-214 — final notice | Only for message five. Used earlier it burns the one escalation you have. | Situational |
Source: Author's reasoning from how invoice inboxes are triaged, not from measurement. Stated as an opinion because that is what it is.
The pattern: everything that helps is a fact about the document, and everything that hurts is a fact about you.
About the templates
Can I use these commercially?
Should I send these from a different address for the last one?
Do reminders work better in the morning?
Or have them sent without you thinking about it
That is the whole product. It does not exist yet, which is why there is a price and a waitlist rather than a signup button.