Payment Reminder Before the Due Date: Templates That Get Invoices Paid on Time

Most advice about late invoices starts after the due date. By then you're already chasing. The cheapest reminder you'll ever send goes out a few days before the invoice is due, when nobody is late, nobody is annoyed, and the only job of the email is to make paying easy.

Over eight years of sending invoices to clients of every size, the pre-due reminder is the one habit I'd keep if I had to drop everything else. It catches the invoice that went to the wrong inbox, the PO that was never raised and the approver who's on holiday, while there's still time to fix it without anyone being "overdue".

This guide covers when to send a payment reminder before the due date, what to put in it, templates you can copy, and how it fits into the rest of your follow-up.

Why a reminder before the due date works

Clients rarely pay late on purpose. Far more often, the invoice is stuck somewhere:

• it went to your project contact, who never forwarded it to accounts,
• accounts payable can't process it because it has no PO number or the wrong legal entity,
• it's waiting for an approver who hasn't seen it,
• it's simply scheduled for a payment run after your due date.

None of those problems shows up until you ask. If you ask on day 8 overdue, you find out on day 8 and the fix takes another week or two. If you ask 3 to 5 days before the due date, you find out with time to spare, and the invoice often gets paid on time.

There's also a tone advantage. A reminder before the due date can't be read as chasing, because nothing is late yet. It's a service message, like a dentist confirming your appointment. That makes it much easier to send to clients you're nervous about upsetting.

When to send it

For most invoices, 3 to 5 days before the due date is the sweet spot:

• Early enough that accounts payable can still fit you into the next payment run.
• Late enough that the client doesn't file it as "later" and forget again.

Adjust for your terms:

• Due on receipt or 7 days: None, or a same-day "invoice sent" confirmation
• 14 days: 3 days before
• 30 days: 5 days before
• 60 days or longer: 7 to 10 days before, plus a check at day 30 that the invoice is approved

On long terms, the mid-point check matters more than the reminder. A 60-day invoice that was never approved is still unapproved on day 59. Our post on payment terms that prevent late payment covers how to set terms that don't drift.

What a good pre-due reminder includes

Keep it short enough to read on a phone:

• Invoice number, amount and due date. In the first two lines.
• A payment link or the bank details. The client should be able to pay without opening another email.
• A light check question. "Is there anything you need from me, like a PO number, to process this?" That single line is what surfaces the stuck invoices.
• The invoice attached or linked again. People rarely search their inbox for the original.

What to leave out:

• Any mention of late fees. Nothing is late.
• Apologies. "Sorry to bother you" turns a routine message into a favour.
• Long explanations about your cash flow.

Templates

Standard pre-due reminder

Subject: Invoice #1042 due on 14 March

Hi Sam,

Quick heads-up that invoice #1042 for €1,600 is due on Friday 14 March. You can pay here: [payment link], or by bank transfer using the details on the invoice (attached again for convenience).

If you need anything to process it, a PO number or a different billing address, just let me know and I'll send an updated copy today.

Thanks, Alex

Short version for regular clients

Subject: Invoice #1042, due Friday

Hi Sam, a reminder that invoice #1042 (€1,600) is due on Friday 14 March. Pay link: [payment link]. Thanks!

For larger companies with accounts payable

Subject: Invoice #1042 (PO 88123) due 14 March

Hi accounts team, I'm checking that invoice #1042 for €1,600, against PO 88123, is approved and scheduled for payment by its due date of 14 March. The invoice is attached. If anything is missing on your side, please tell me what you need and I'll send it straight away.

For a new client's first invoice

Subject: Your first invoice, #1042, due 14 March

Hi Sam, since this is our first invoice together, I wanted to check it reached the right person. Invoice #1042 for €1,600 is due on 14 March. Pay link: [payment link]. If invoices should go to someone else in your team, let me know who and I'll send future ones directly.

That last template has saved me more late payments than any other. The first invoice is where routing mistakes happen, and finding out early fixes every invoice after it.

How the pre-due reminder fits the rest of your follow-up

The pre-due reminder is the first rung of a ladder, not the whole thing:

1. Invoice sent the day the work is accepted. See the same-day invoicing habit.
2. Pre-due reminder, 3 to 5 days before the due date.
3. Due-date note, on the day.
4. Overdue follow-ups at around 7 and 14 days.
5. Final notice at around 30 days, with a clear consequence. Our final notice guide has templates.

The reminder ladder and polite escalation scripts go deeper on the later steps.

Mistakes to avoid

Sending it too early. A reminder 3 weeks before the due date just trains the client to ignore you.

Sending it to the wrong person. If your contact isn't the person who pays, copy accounts payable. If you don't know who that is, the pre-due reminder is a good time to ask.

Making the client hunt for the invoice. Attach it or link it again every time.

Using it to renegotiate. Don't use a pre-due reminder to raise a scope question or a rate change. Keep it about this invoice only.

Not tracking replies. If a client answers "we need a PO", that's a task with a deadline. Log it next to the invoice so it doesn't get lost in your inbox.

What to do when the client replies

A reply to a pre-due reminder is good news, even if it's a problem, because you're hearing about it before the due date.

• "We need a PO number." Ask who raises it and when, then send an updated invoice the moment you have it. Our post on purchase order friction explains why this step stalls so many invoices.
• "It's in the next payment run." Ask for the date and note it. If that date is after your due date, decide whether to accept it this time and fix the terms for next time.
• "Can we split it?" Agree dates in writing. See partial payments and installment invoices.
• "Is this right? We expected less." Treat it as a question about the work, not a refusal to pay, and answer it quickly. Our invoice dispute guide helps if it turns into more.

Make the invoice itself easy to pay

A reminder only works if paying is simple. Before you rely on pre-due reminders, check your invoice against our invoice checklist:

• correct legal name and billing address for the client,
• PO number if they use one,
• clear due date (a calendar date, not just "Net 30"; see why calendar due dates beat Net 30),
• a payment link and bank details,
• line items a finance person can approve without asking you.

FAQ

Is it rude to send a payment reminder before the due date?

No. Nothing is late, so it reads as a courtesy, especially when it offers help ("anything you need to process this?"). Most clients appreciate it.

How many days before the due date should I send it?

Three to five days for 14 or 30-day terms. On 60-day terms or longer, also check at the mid-point that the invoice has been approved.

Should I include late fee terms in a pre-due reminder?

No. Keep late fees for overdue reminders, and only if your contract or the law allows them.

Can I automate pre-due reminders?

Yes, and it's worth doing, because the value comes from sending them every single time, not just when you remember. Keep the wording personal enough that it doesn't read like a system notice.

Put the reminders on a schedule

Pre-due reminders work because they're consistent, and consistency is exactly what slips when you're busy delivering work. DueChat puts your invoice due dates on Google Calendar next to the rest of your week, so the pre-due note is hard to forget. After the due date it takes over the chasing: reminder emails on day 7, 14 and 30 past due until the invoice is paid or you pause it, sent from your Gmail, with Stripe checkout on your own account so clients can pay in one click.

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