This guide provides an operating framework, not legal, financial, safety, medical, licensing, or regulatory advice. Adapt it to your business and local requirements.
Collect the terms up front
Put the net terms and any deposit right on the estimate, and have the customer sign it before any work starts. Once that is in writing, the end-of-job argument mostly disappears. The answer lives on the paper, not in someone's memory. A quick yes at the estimate beats a debate on the final invoice.
Capture payment at booking, charge on completion
Grab a card or an ACH authorization at booking, hold it, and run the final charge the day the work passes its check. Nobody enjoys chasing a mailed invoice. They go to the wrong address. They sit on a desk for two weeks. Once the money is already set to move, the why-is-this-not-done asks vanish, and the job closes clean.
Send one friendly reminder before it's due
A single heads-up the day before the due date catches most past-due calls before they happen. Name the amount. Name the deadline. Give one obvious way to pay. It reads as helpful, not pushy, and it spares your staff the phone tag twice a day.
Set a fixed cadence for follow-up
Handle a late balance on a fixed rhythm, so nobody improvises based on mood. A call at ten days, a written notice at thirty, then escalate. Predictable is fair. Fair is easier to defend, to the customer who is late for a reason and to the one who is not.
Debrief write-offs monthly
At the end of each month, list whatever got written off and the reason attached to each entry. The pattern shows you exactly which terms to tighten, and one excuse keeps showing up in different coats. That monthly debrief converts a pile of small losses to a single, fixable decision about how the next job gets sold.