The payment deadline trick that saved my last retainer

I used to just send invoices and hope for the best, but after getting ghosted on $2,800 from a web dev project, I tried adding a 5 day late fee notice right in the invoice footer. Last month, a client who usually goes silent for weeks paid within 48 hours of me referencing that notice in a follow-up. It wasn't the threat that worked, it was the specific date I put in bold, like 'invoice due July 10, late fee kicks in July 15'. Anyone else find that a hard deadline with a number attached beats any friendly reminder?

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aaronroberts11h ago

My last big invoice had the same problem until I added a late fee line that said 2% per week after the 15th. The client paid on the 14th, which was the first time in six months they hit a date I gave them. I also started putting the invoice number in the subject line of every reminder email, so they could find it without digging. The key for me was making the late fee amount real, like $40 on a $2,000 invoice, not some vague warning. That number makes them do the math themselves, and that does more than any polite nudge ever did.