Late payment fee on an invoice: wording and the math
A short, plain guide to late payment fee invoice, and a tested bot that does the job with your real inputs.
Unofficial, not affiliated with any invoicing, payments or accounting software, OpenAI, Anthropic or xAI.
What you need
- Your invoice: number, client, amount, issue date and payment terms
- Any late fee wording from your contract, word for word
- Payments received so far and how you want to sound
How to do it
- Gather the inputs above in one place.
- Paste them into Duely in ChatGPT, Claude or Grok.
- Read every step it shows. Fix any input that looks wrong and run it again.
- Check every date and amount against your invoice and contract before you send. Late fee rules differ by state and country; this is not legal advice.
Questions
Can i charge a late fee on an invoice?
It depends on your own numbers and the current rules. Duely works it out from what you paste in and shows each step, so you can check it. Check every date and amount against your invoice and contract before you send. Late fee rules differ by state and country; this is not legal advice.
How do i calculate a late fee?
It depends on your own numbers and the current rules. Duely works it out from what you paste in and shows each step, so you can check it. Check every date and amount against your invoice and contract before you send. Late fee rules differ by state and country; this is not legal advice.
What is a normal late fee for invoices?
It depends on your own numbers and the current rules. Duely works it out from what you paste in and shows each step, so you can check it. Check every date and amount against your invoice and contract before you send. Late fee rules differ by state and country; this is not legal advice.
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