Free Tool
Late Payment Calculator & Reminder Generator
Enter an invoice amount, how many days it's overdue, and your jurisdiction to estimate the interest owed — then get a ready-to-send, three-stage reminder sequence (friendly, firm, final notice) you can copy and email today.
The US has no single federal statutory interest rate for private B2B invoices — it depends on your state and what your contract or invoice terms say. 1.5%/month (18%/year) is a widely used default; check current rules for your state before invoicing it.
For the reminder emails (optional)
Why the paper trail matters
On r/smallbusiness, a small remodeling business owner described chasing a $14,200 final invoice for two months — "polite emails, then less polite emails, then calls" — while stuck deciding whether legal action was worth the cost of chasing money already owed. In a separate thread, someone who took over billing for a family business found a customer sitting on nearly $200,000 in unpaid invoices going back years; the fix the community converged on was simple but blunt: move that account to pay-on-delivery until the balance was cleared.
Both stories point the same direction: a clear, documented, escalating sequence — sent early, not after months of silence — is what gives you a real paper trail if it ever needs to go further, and it's often what gets you paid before it does.
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Mustard Seed Solutions helps solopreneurs tighten up contracts, terms, and collection workflows so late payment becomes the exception, not the routine.
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