The biggest mistake trades and service businesses make with unpaid invoices is waiting too long to say anything. The longer an invoice sits, the harder it is to collect. A friendly nudge at 3 days past due is normal business. A first contact at 60 days feels awkward for everyone and signals that you don’t take your own payment terms seriously.

Start before the invoice is even late. A brief reminder a day or two before the due date works well. Something like “Just a heads up that invoice #1042 is due on Friday. Let me know if you have any questions.” This isn’t pushy. It’s professional, and it catches issues early like a misplaced invoice or a billing dispute before the payment is actually late.

If the due date passes, follow up within a few days. Keep the tone casual and assume it was an oversight. Most of the time, it was. People get busy. Checks get lost on a desk. A quick phone call or text often resolves it faster than email because it’s harder to ignore and easier to get a straight answer about when payment is coming.

At 14 to 30 days past due, be more direct. State the invoice number, the amount, the original due date, and ask for a specific payment date. This isn’t the time for vague language. You want a commitment, even if it’s a partial payment or a date they can pay in full. If someone gives you a date and misses that too, you know where things are headed.

Beyond 30 days, the tone should shift from reminder to formal request. Put it in writing. Reference your previous attempts to reach them. Mention any late fees outlined in your contract. For contractors and trades businesses working in California, this is also when you should be thinking about your mechanic’s lien rights if applicable. Those deadlines are strict and missing them means giving up real leverage.

Throughout all of this, document every communication. Save emails, note dates and times of phone calls, and keep records of what was agreed to. If you ever need to escalate to a collections agency or small claims court, this paper trail is what makes your case.

The best long-term fix is building follow-up into your invoicing process so it happens automatically. Set up reminders in your accounting software. Track aging receivables weekly instead of guessing who owes what. When you have a clear system, the follow-up feels routine rather than personal, which makes it easier to actually do.

Prevention helps too. Put payment terms in writing before work starts. Require deposits on larger jobs. Accept multiple payment methods so nobody can use “I don’t have my checkbook” as an excuse. The clearer you are upfront, the less chasing you do later.

One thing to keep in mind is that consistent bookkeeping for trades businesses makes collections far easier. When your books are current, you know exactly who owes what and how long it has been outstanding. You are not digging through old emails trying to figure out if someone paid. You just look at the aging report and pick up the phone.