Unpaid invoices aren't a personality flaw of your customers. They're a systems problem, and it's mostly on the shop's side. Every fix below shrinks the same gap: the time between "the job is done" and "the customer can pay in ten seconds." Ranked from zero effort to policy change.
The single biggest lever. Payment odds decay with every hour between finished work and delivered invoice. The customer's gratitude is at its peak while the house is cooling down, and it fades to "I'll deal with it later" by the weekend. If your invoices go out "tonight" or "Friday when I do paperwork," fixing this one habit beats everything else on the list combined. (This is FieldForge's whole reason to exist, speak the job, invoice sends itself, but the habit matters more than the tool: however you invoice, do it on site.)
Every barrier between "I should pay this" and "paid" costs you days. A card link in the invoice text means the customer pays from the couch in the time it takes to find their wallet. Yes, card processing costs money: 2.9%+ at most platforms, 1% on FieldForge. But chase-down time, re-billing, and awkward calls cost more.
"We're due on receipt: I'll text the invoice when I'm done; most folks pay right from the link." One sentence at the door. Customers pay slow when nobody told them fast was expected; the ones who bristle at clear terms were going to be your slowest payers anyway.
Nobody enjoys the "just following up on invoice 1042" text, so it doesn't get sent, so the invoice ages. Automation doesn't get embarrassed: a polite reminder on a schedule until the invoice is paid. FieldForge sends these automatically on paid plans, but even doing it manually from a calendar reminder beats doing it never. The tone that works: short, friendly, with the payment link right there.
Any job with real material cost (a changeout, a repipe, a panel upgrade) should collect 30–50% up front. It filters non-serious customers, funds your materials, and turns the final invoice into a smaller, easier yes. Put the deposit on the estimate so it's agreed before work starts.
A "1.5% monthly on balances past 30 days" line on the invoice moves you up the customer's pile without a single confrontation. Check your state's rules on maximum rates, apply it only to serial offenders, and remember its job is to be read, not collected.
Faster collection on an underpriced job is still an underpriced job. If you haven't checked in a while whether your service call fee actually covers the truck roll, run your numbers through our free service call fee calculator, takes about a minute, and the answer surprises most owners.