Late Fee Calculator — Overdue Invoice Interest (% / Flat)
Free late-fee calculator for overdue invoices. Three models: monthly interest %, flat fee per month overdue, or both combined. Defaults to the common 1.5% / month.
Late Fee / Interest Calculator
Late fee charged
$225.00
Total amount owed
$10,225.00
Most jurisdictions cap late-fee interest. India: usual contract rate is 1.5% / month (~18% annually). US: usury caps vary by state; California maxes out at 10% APR for unsecured commercial debt. Check before sending the invoice.
What you can legally charge
Late-fee maximums vary by jurisdiction. India: contracts commonly use 1.5% / month (~18% APR). Most US states cap unsecured commercial debt around 10-18% APR. Always state your late-fee policy in writing on the invoice and in your engagement contract.
How to use the Late Fee / Interest Calculator
Takes about a minute. No signup, no download, your data stays in your browser.
- 1Open the tool. Scroll up to the Late Fee / Interest Calculator above — it loads instantly in your browser, no install needed.
- 2Enter your values. The fields come pre-filled with realistic defaults so you can see how it works — replace them with your own numbers.
- 3Read the result. The output updates instantly. Copy or share it — nothing is uploaded to a server, everything stays on your device.
Frequently asked questions
Common questions about the Late Fee / Interest Calculator.
Is the Late Fee / Interest Calculator free to use?
Yes. The Late Fee / Interest Calculatoron 7BusyBoss is completely free — no signup, no paywall, no usage cap.
Do I need to sign up to use the Late Fee / Interest Calculator?
No. The Late Fee / Interest Calculatorworks instantly in your browser — no account needed. Signing in with Google is optional and only unlocks features like saving favorites and higher AI build limits.
Does the Late Fee / Interest Calculator work on mobile?
Yes. Every tool on 7BusyBoss is mobile-responsive and works in any modern browser — Chrome, Safari, Firefox, Edge — on phones, tablets and desktops.
Is my data safe when I use the Late Fee / Interest Calculator?
Yes. The Late Fee / Interest Calculatorruns entirely in your browser — your inputs never leave your device unless the tool explicitly fetches public data (e.g. currency rates). We don't store the values you type.
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