How to handle a non-paying customer: the 5-step sequence that actually collects

Industry-wide data: an invoice past 30 days has a 79% collection probability. Past 90 it drops to 47%. Past 180 it's under 25%. The difference between contractors who get paid and contractors who don't isn't who they invoice. It's the cadence they run when an invoice goes past due.

Most contractors handle non-paying customers in one of two ways. Either they send a stern letter at 60 days and then let it sit until they give up at 120, or they call the customer angrily at 45 days, get a brush-off, and then never follow up. Both lose more money than the alternative.

Here's the sequence that actually works. Run it on every overdue invoice without exception. The discipline is more important than any individual touch.

The 5-step sequence

Day 1 (the day after due date): friendly automated reminder

The invoice is one day late. Send an automated email + text:

Hi [Name], quick reminder that invoice #[1234] for $[amount] was due yesterday. If you've already paid, ignore this. If not, you can pay online here: [link]. Thanks!

Tone is conversational, not accusatory. About 35-45% of overdue invoices pay within 48 hours of this touch — most weren't malicious, just forgot.

Why automated: if you call personally on day 1 you've used your highest-leverage touch on the easiest case. Save the personal touches for the harder ones.

Day 7: same friendly text + a quick call

One week past due. Re-send the text with a slightly different framing:

Hi [Name], following up on invoice #[1234] — was there an issue with the service or the invoice itself? Happy to help resolve. Pay link: [link]

THEN call the customer. Voicemail or live, leave a 30-second message:

Hi [Name], this is [Your Name] from [Company]. Just following up on the invoice from [date] — wanted to see if everything was OK with the service. Give me a ring back at [number] when you get a chance.

Don't mention the dollar amount or the lateness on the call. The text already did that. The call is to surface any unspoken issue — if the dishwasher you fixed is leaking again, you need to know now, not in a small-claims filing 8 months from now.

About 25-30% of remaining unpaid invoices clear within a week of this touch. Half because the customer pays, half because they raise an issue you can fix in 20 minutes.

Day 21: the "is something going on?" personal email

Three weeks past due. Send a one-paragraph personal email (or SMS if you don't have a strong email channel):

Hi [Name], Following up one more time on invoice #[1234] for $[amount] from [date]. Haven't heard back from my previous notes, which is unusual — just wanted to check in to see if something's going on. If there's a hardship situation, let's talk about a payment plan. If there's an issue with the work, I'd much rather hear it now than later. Otherwise, please let me know when I can expect payment. Thanks, [Your Name]

Two patterns this touch surfaces:

Genuine hardship: customer offers to pay in installments. Almost always worth saying yes — a $1,200 invoice paid $200/month for 6 months is way better than $0 collected and a write-off.
Dispute they never raised: customer says "I wasn't happy with how the install looked" or "you charged me for a part you didn't replace." This is GOOD news to surface — you can either fix it and complete the collection, or settle for a partial payment.

About 15-20% clear at this touch.

Day 45: the formal demand letter

If the previous 3 touches didn't resolve it, escalate. Send a paper letter (USPS, not just email — paper letters get attention emails don't) on letterhead:

Dear [Name],

Invoice #[1234] for $[amount] for services performed on [date] at [address] remains unpaid 45 days past its due date.

Despite [number] previous outreach attempts (texts on [dates], call on [date], email on [date]), we have not received payment or a response with a payment plan.

This is a formal request for payment in full within 14 days. If payment is not received by [date], we will [option A: send to collections] [option B: file a mechanic's lien] [option C: pursue in small claims court].

If you have a dispute about the work performed, please respond in writing within 7 days outlining the specific issue.

Sincerely, [Your Name] [Company Name]

Match the threat to your actual ability + willingness to follow through. A mechanic's lien is leverage if you can actually file one (state laws vary, deadlines are tight — usually 60-120 days post-completion). Small claims court is leverage if the amount is under your state's small claims limit and you'll actually show up. Don't bluff a remedy you won't pursue — customers can tell.

About 30-40% of remaining unpaid invoices clear at this touch. Paper letters have a psychological weight that emails and texts lack.

Day 60: execute the remedy

If you said you'd file a mechanic's lien, file it. If you said you'd send to collections, send it. If you said you'd pursue small claims, pursue it.

The discipline here is everything. Customers who don't pay learn quickly which contractors actually follow through vs. which ones threaten and then disappear. The shops with the highest collection rates have a reputation in their community that if the demand letter goes out, the next step happens.

Realistic remedy outcomes:

Mechanic's lien: ~65-80% collection rate, but the timing is sensitive (most states require filing within 60-120 days of work completion). Useful for residential jobs over $1,500.
Collections agency: 35-55% collection rate, you pay 25-50% commission on what they collect. Worth it for invoices over $800 you'd otherwise write off.
Small claims court: ~70% win rate if you have signed work orders + photos + invoice, but collecting the judgment afterward drops to 40-60%. Best for invoices $500-$5,000 (varies by state limit).

What NOT to do

Three patterns that look like collection discipline and aren't:

Yelling at the customer on day 30. Feels good, costs you the relationship, doesn't speed up payment. Customers in genuine hardship retreat further when shamed. Customers playing the slow-pay game laugh.

Resending the same invoice every 3 days. Becomes invisible noise after the second one. The escalating cadence above is much harder to ignore — each touch is a different mode.

"I'm sending you to collections" as an empty threat. Customers can tell. The threat works exactly once per customer per lifetime; if you bluff it, you've burned the leverage.

The write-off decision

Some invoices won't ever pay. Knowing when to stop is its own discipline. The honest math: by day 180, your expected recovery is under 25% of face value, AND every hour you spend chasing it has an opportunity cost. For invoices under $500, write off at day 90. For invoices $500-$2,500, write off at day 150 if you've completed steps 1-5 and the remedy didn't collect. For invoices over $2,500, the math usually supports continuing past day 180 — the absolute dollar value justifies the additional time.

Write-offs aren't failures. They're a cost of doing business with the upside that the customer becomes someone you don't have to work for again.

The system that automates the discipline

The hardest part of running this cadence is remembering to run it. The shops that collect 90%+ of invoices have one of three setups:

CRM auto-reminders that send the day-1 and day-7 texts automatically and surface day-21 / day-45 touches as tasks on the dispatcher's screen.
Bookkeeper running the calendar as part of weekly AR review.
Spreadsheet + Friday morning ritual where the owner reviews every overdue invoice and triggers the next touch manually.

Whichever you pick, the system is the entire game. The collection rate gap between "we have a system" and "we wing it" is roughly 25-35 percentage points on the same customer base. That's the difference between $15K/year and $45K/year of net collections on a 200-invoice book.

Set the cadence once. Run it on every invoice. The number will move within a quarter.