Calculate a Late Charge on an Overdue Invoice
Free late charge calculator. Enter invoice amount, days late, and annual or monthly late fee rate to estimate the charge and total amount owed.
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No signup, no credit card, and no data stored on our servers.
Invoice Details
Number of days past the invoice due date
Standard is 1.5%/month (18%/year). Check your contract or local laws.
Late Fee Calculation
Total Amount Now Owed
$2,536.99
Original invoice + 30-day late fee
Late Fee Charge
$36.99
At 18% annual rate for 30 days
Monthly Interest Accrual
$37.50
1.50%/month on $2,500
Late Fee Timeline
How the fee grows over time at 18% annual rate on a $2,500.00 invoice.
| Days Overdue | Late Fee | Total Owed |
|---|---|---|
| 30 days | $36.99 | $2,536.99 |
| 60 days | $73.97 | $2,573.97 |
| 90 days | $110.96 | $2,610.96 |
Late Payment Notice Template
Copy this into your follow-up email to the client:
Late charge calculator for overdue work
Use this when a client invoice is overdue and you need to calculate a reasonable charge from your written payment terms.
Keep the relationship professional
The calculator also gives you a practical total to include in a payment reminder, so the follow-up is clear without sounding improvised.
Tool guide
Late Charge Calculator: free online workflow
The Late Charge Calculator is built for people searching for late charge calculator, calculate late fee, late fee calculator, and overdue payment charge calculator, and a fast way to calculate the result without a paid download step. It keeps the calculator, generator, or file workflow on the same page as the explanation, so the searcher can read the guidance and use the tool immediately.
Use it when you need a practical answer, export, document, or formatted file quickly. The page is designed as a focused landing page for business operations searches: clear instructions first, the working tool above, FAQs below, and internal links to related tools when the next step belongs somewhere else.
For broader workflows, browse the Business Operations category. That page groups the related tools together so users can move from research to action without returning to search results.
What it helps with
Free late charge calculator. Enter invoice amount, days late, and annual or monthly late fee rate to estimate the charge and total amount owed.
Why it can rank
The page targets specific business operations intent instead of sending every query to the homepage.
Best next step
Use the tool, then compare related business operations tools from the category page if your workflow needs another step.
Frequently Asked Questions
How do I calculate a late charge?▾
Convert your annual or monthly late fee rate into a daily rate, multiply by the number of days overdue, then multiply by the invoice amount. The calculator does this automatically.
Can I charge a late charge if it was not in the contract?▾
It is much harder to enforce a late charge if the original contract or invoice did not disclose the fee. Add late-fee language before work begins.
What is a common late charge rate?▾
Many freelancers use 1.5% per month or 18% per year, but rules vary by location and contract. Check local limits before enforcing a fee.
Should I send a reminder first?▾
Yes. Send a polite reminder before adding fees. Use late charges to enforce agreed terms, not as the first communication.