You finished the job, cleaned up, sent the invoice — and two weeks later, nothing. If you run a plumbing business, you know the awkward feeling of chasing a customer for money you've already earned. The good news: a short, well-timed reminder email gets most invoices paid without a single phone call.
Why reminder emails work better than phone calls
Most late payments aren't malicious. Your customer got busy, the invoice sank in their inbox, or they simply forgot. A reminder email works because it's low-pressure for both sides: the customer doesn't feel ambushed, and you don't have to make the uncomfortable call. It also creates a paper trail, which matters if the invoice ever becomes a real dispute.
The timing schedule that works
Consistency beats intensity. A single angry email after 45 days does less than four polite ones on a schedule:
- Due date: a friendly note that the invoice is due today.
- 3 days late: a polite follow-up asking if there's any issue.
- 7 days late: a firmer reminder with the payment options laid out.
- 14 days late: a final notice with a clear deadline.
Customers learn quickly whether you follow up. Plumbers who chase consistently get paid first — it's that simple.
Template 1: The friendly nudge (due date)
Subject: Invoice #1042 is due today
Hi Sarah,
Just a friendly note that invoice #1042 for $650 (water heater installation) is due today. You can pay online here: [payment link].
If you've already sent payment, please disregard this — and thank you!
Best,
Mike, Smith Plumbing
Template 2: The polite follow-up (3–7 days late)
Subject: Reminder: invoice #1042 is past due
Hi Sarah,
I wanted to follow up on invoice #1042 for $650, which was due on March 3rd. If there's any problem with the invoice, just reply to this email and we'll sort it out.
Payment options: [payment link] or check by mail.
Thanks,
Mike
Template 3: The final notice (14+ days late)
Subject: Final notice: invoice #1042 remains unpaid
Hi Sarah,
Despite previous reminders, invoice #1042 for $650, due March 3rd, remains unpaid. Please arrange payment within 7 days.
If there is a problem with this invoice, reply to this email so we can resolve it before I have to consider further steps.
Regards,
Mike, Smith Plumbing
Mistakes that keep you unpaid
- Apologizing for asking. "Sorry to bother you, but..." undermines you. You did the work; the money is owed.
- Skipping reminders when things get busy. The moment you stop chasing, your invoice moves to the bottom of the customer's pile.
- No payment link. Every extra step between "I should pay this" and paying costs you days. Put a link in every email.
- Escalating too fast. A legal threat on day 5 burns a customer who probably just forgot.
Put the whole thing on autopilot
The schedule above works — but only if it actually happens. Between jobs, quotes, and callbacks, manual follow-up is the first thing that slips. That's exactly what PayNudge automates: add the invoice once, and polite, escalating reminders go out on schedule until it's paid. Replies come straight to your inbox, so the conversation stays personal.