Add the numbers for your scenario.
01Freelance & Business toolCalculated result
Late Fee Calculator
Interest and fees on an overdue invoice.
100% FreeRuns instantlyNo watermark
- 1Enter detailsAdd the numbers for your scenario.
- 2CalculateVootkit updates the result instantly.
- 3ReviewCheck totals, notes and breakdowns.
Private by designProcessed on your device where possible.
Works on any deviceDesktop, tablet and mobile browsers.
No installationOpen the page and start working.
Always free coreUse the free plan for everyday tasks.
How to use Late Fee Calculator
Vootkit updates the result instantly.
02Check totals, notes and breakdowns.
03Copy the answer into your workflow.
04Your files stay private
Your work is processed locally in your browser where possible and is never added to a Vootkit upload library.
Learn more about privacyCharging interest on an overdue invoice is usually less about the money than about the signal — an invoice that costs nothing to ignore is the one that gets paid last.
What Late Fee Calculator does
Calculates interest on an overdue amount from an annual rate and the days outstanding, defaulting to 2,500 at 45 days.
The daily rate is the annual rate divided by 365, so the charge accrues gradually rather than arriving as a lump on day one.
How it accrues
| Invoice amount | Default 2,500 |
|---|---|
| Days overdue | Default 45 |
| Rate | Annual percentage |
| Daily rate | Annual ÷ 365 |
| Returns | Interest accrued and the new total |
| <strong>Must be agreed</strong> | <strong>In your terms, before the work</strong> |
| Statutory rights | Some jurisdictions allow interest by law |
| Not | Legal advice |
Detailed steps
- Check your contract states a late-payment charge — see the tip.
- Enter the amount, days overdue and rate.
- Reference the clause when you send the updated invoice.
Worth knowing
The clause has to exist before the invoice does. Adding interest that was never in your terms is generally unenforceable and reads as opportunistic, which damages the relationship you are trying to preserve. Put a late-payment term in your standard contract once and it covers every client afterwards — several jurisdictions also grant statutory interest on commercial debts even without a clause, which is worth checking locally.
Frequently Asked Questions
Can I charge interest without it being in the contract?
Often not by contract, but some jurisdictions grant a statutory right to interest on late commercial payments regardless. Check your local position — in several countries that statutory rate is higher than most people would have written into their terms.
What rate is reasonable?
Commonly a base rate plus a margin, and some jurisdictions specify the formula. An unreasonably high rate risks being treated as a penalty and struck out entirely, which leaves you with nothing.
Should I actually charge it?
Judgement. Its main value is deterrent — clients who know interest accrues pay sooner. Many businesses state the term, invoke it rarely, and find the stating alone does the work.
What if they still do not pay?
Escalate in writing with a clear deadline, then consider formal recovery. Interest keeps accruing but does not compel anyone; the letter that says what happens next is what usually moves things.
Is Late Fee Calculator free?
Yes. The Vootkit free plan includes 5 tool runs a day. Upgrade to Vootkit Pro for unlimited daily use, an ad-free workspace and saved workflows.
Are my files uploaded?
No. Late Fee Calculator runs entirely in your browser — your file is processed on your own device and never sent to a server. There is nothing for us to store or delete.
Do I need to install anything?
No. Late Fee Calculator works in any modern browser on desktop, tablet or phone. Open the page and start.
How often can I use it? Is there a daily limit?
On the free plan you get 5 tool runs a day. When you reach the limit you'll see a prompt to upgrade, and it resets the next day. Vootkit Pro removes the cap entirely for unlimited daily use.
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This tool processes everything locally in your browser. You can disconnect from the internet after the page loads and it will still work.