Why Plumbers Write Off $20K+ Per Year in Unpaid Work (And How to Fix It)

Most plumbing contractors know they have some uncollected invoices sitting out there. What they often don't know is just how much it adds up to. If you run a plumbing business with 3–5 crews and you're doing residential and light commercial work, you're almost certainly losing $20,000–$40,000 per year in invoices that were worked but never fully collected.

That's not speculation. According to data from the Commercial Collection Agency Association (CCAA) and credit insurer Atradius, the construction and trades sector has some of the highest rates of late payment and write-offs among service industries — with SMB contractors in the $500K–$2M revenue range consistently reporting 8–12% of annual revenue as uncollected.

Why Plumbers Specifically Struggle with Collections

The nature of plumbing work creates specific collection challenges that other service businesses don't face in the same way.

Emergency work creates ambiguous expectations. When a pipe bursts at 11pm, a customer calls frantically and you show up and fix it. That's a great service — but it also means there was no upfront estimate, no signed work order, and often no clear understanding of what the final bill would be. When that invoice arrives a few days later, some customers experience sticker shock and become slow or reluctant payers.

Multi-visit jobs create billing complexity. A large re-pipe or bathroom plumbing renovation involves multiple visits over days or weeks. If you don't have a clear billing milestone structure, customers may feel like they're being nickel-and-dimed or may dispute the final number against their expectations from an initial quote.

Small jobs are easiest to ignore. A $150 faucet repair or a $300 drain clearing — nobody's dispatching a collection agency over those. So they sit in the receivables ledger, get followed up on once or twice, and eventually get written off. But those small amounts add up fast.

The Real Math Behind a $20K Write-Off

Let's put specific numbers on it. Consider a plumbing operation doing $1M in annual revenue:

• At a 10% uncollected rate (low end for the industry), that's $100K in invoices that go out.
• If 20% of those get fully paid after extended follow-up, you recover $20K.
• The remaining $80K is written off — but you've already absorbed the labor and material cost for that work.
• At a 40% gross margin, those $80K of lost invoices represent $32K in out-of-pocket cost on top of the lost revenue.

The figure you see on paper ($80K written off) understates the real damage. The actual hit to the business includes the margin erosion, the opportunity cost of working jobs that never paid, and the admin time spent chasing invoices that ultimately went nowhere.

4 Systems That Actually Fix the Problem

1. Collect a deposit before emergency dispatch

For after-hours emergency calls, require a credit card on file before dispatching. You don't have to charge it upfront — but having it collected means you can complete the transaction without a follow-up billing cycle. Many plumbing dispatch platforms support card-on-file workflows natively.

2. Send invoices with a payment link, not just a number

A paper invoice or PDF attached to an email creates friction. The customer has to write a check, log into their bank, or call in a card. Every extra step reduces conversion. A payment link embedded in the invoice email — one click to a secure payment page — removes that friction entirely and measurably improves same-day payment rates.

3. Build a 5-touch follow-up sequence and actually run it

Research consistently shows that most late-paying customers aren't malicious — they're busy and disorganized, just like you are. They need reminders. The CCAA data suggests the average delinquent account requires 5–7 contacts before resolution, but most contractors give up after 1–2.

A 5-touch sequence over 30 days significantly outperforms ad-hoc follow-up. The touches should be professional but increasingly direct: friendly reminder → second reminder with payment link → phone call → firm notice → final notice before escalation.

4. Automate the sequence so it actually happens

The reason most plumbing businesses don't run a proper follow-up sequence isn't because they don't know they should — it's because the office is overwhelmed with scheduling, customer service, and administrative work. A follow-up sequence only works if it runs reliably on every invoice, every time.

Automation solves this. When an invoice goes 1 day past due, the first reminder triggers automatically. When it hits day 7, the second one goes out. No manual tracking, no forgotten invoices, no skipped follow-ups because the office manager was out sick.

What Good Collections Actually Looks Like

A plumbing business with a well-run collections process typically achieves a 90%+ collection rate on invoices within 60 days. That means less than 10% of your revenue ends up in write-offs — compared to the industry average of 8–12% that never comes in.

The difference between a 90% collection rate and a 75% collection rate on $1M of revenue is $150,000. That's a second truck. That's a new hire. That's taking a real salary out of the business instead of scraping by.

Collections isn't a nice-to-have back-office function. It's one of the highest-leverage activities in your business.