Freelance Late Payment Interest Calculator
Estimate statutory-style late payment interest and compensation on overdue freelance invoices based on invoice value, annual rate and days late.
Overview
Use this Freelance Late Payment Interest Calculator to estimate interest on an overdue invoice and see how a fixed compensation amount could change the total due. Enter your invoice amount, the number of days late and the annual interest rate to get a quick estimate.
How it works
The calculator applies simple interest to the unpaid invoice amount using a daily rate derived from the annual interest rate. The daily rate is the annual rate divided by 365, then multiplied by the invoice amount and the number of overdue days. If you choose to include fixed compensation, that amount is added once to the invoice and interest total.
How to use this calculator
- 1Enter the original invoice amount.
- 2Add the number of days the payment is overdue.
- 3Enter the annual late payment interest rate.
- 4Choose whether to include a fixed compensation amount.
- 5Review the estimated interest, compensation and total due.
Example Calculation
Invoice amount
$1,000
Days late
30
Annual interest rate
8%
Include fixed compensation
true
Fixed compensation amount
$40
Late payment interest
$6.58
For a 1000 invoice that is 30 days late at 8% annual interest, the estimated interest is about 6.58. With 40 fixed compensation included, the total amount due is about 1046.58.
Frequently asked questions
What does this calculator estimate?
It estimates simple late payment interest on an overdue freelance invoice and can also add a fixed compensation amount.
Does this calculator use compound interest?
No. It uses simple daily interest on the original invoice amount unless you apply a different method separately.
Can I use this for any country?
You can use it for a general estimate, but legal entitlement to interest or compensation depends on local laws and contract terms.
What interest rate should I enter?
Use the rate stated in your contract or the relevant statutory late payment rate for your situation.
Why include fixed compensation?
In some places, late payment rules allow a creditor to add a fixed recovery amount alongside interest. This calculator lets you include that if relevant.
Does the total include the original invoice?
Yes. The total amount due combines the original invoice, estimated late interest and any fixed compensation entered.
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Assumptions and warnings
Assumptions
- This calculator uses simple daily interest based on a 365-day year.
- It assumes interest is charged only on the original invoice amount, not compounded.
- Any fixed compensation is added once, not per day or per reminder.
- Results are estimates and may not match the exact rules in your contract or jurisdiction.
Warnings
- This calculator provides an estimate only and is not legal or financial advice.
- Late payment rules and compensation rights vary by country, contract terms and client type.