late payment calculator: A late payment calculator helps you find out how much extra money you owe when a payment is late.
You just enter the original amount, the due date, and the interest rate. The calculator then shows the total amount you need to pay, including the late fees or interest.
Late Payment Interest Calculator
Under the Prompt Payment Act, if a federal agency pays a vendor late, it has to pay interest. From July to December 2025, the interest rate is 4.625% per year.
Formula:
\( \text{Interest} = P \times \left( \frac{r}{360} \right) \times d \)where:
- P = invoice amount
- r = yearly interest rate
- d = number of days the payment is late
Statutory Interest on Overdue Invoices
In the U.S., the Prompt Payment Act Requires Federal Agencies to Pay Interest if They Pay Bills Late. The Interest Starts the Day After the Payment Due Date. The Secretary of the Treasury Decides the Interest Rate, and It Is Published in the Federal Register. Some States Have Laws That Limit How Much Interest or Late Fees Can Be Charged. For Most Federal Contracts, the Interest Adds Up Daily Until the Full Payment Is Made.
Prompt Payment Interest Rates (US / UK / Canada)
In the U.S., the prompt payment interest rate is 4.625% for July to December 2025.
In Canada, the “payment on due date” interest rate is about 5.73% for November 2025.
In the U.K., businesses can charge 8% above the Bank of England’s base rate as statutory interest on late payments.
Late Invoice Fee Calculator
A Late Invoice Fee Calculator helps add extra charges to invoices that are paid late. In the U.S., this is usually done by applying either a percentage or a flat fee based on the payment terms.
formula:
\( \text{Late Fee} = \text{Invoice Amount} \times \text{Late Fee Rate} \)Overdue Payment Penalties & Interest Calculator
Under the Prompt Payment Act (31 U.S.C. § 3902), U.S. federal agencies must pay interest on late vendor invoices. Interest begins the day after the payment due date and continues until the bill is paid. The current federal prompt payment interest rate (for July–December 2025) is 4.625%. If a payment remains unpaid for more than 30 days, the penalties may compound monthly. Some federal agencies, like the Department of Health and Human Services (HHS), use different interest rates for overdue debts.
Late Payment Charges for Business Invoices
Businesses should clearly state late-fee terms in their contracts. The amount of the fee depends on the state, and some states set a maximum limit. Usually, late fees are 1–2% per month on the overdue amount.
For example, Wisconsin limits late fees to 1% per month (12% per year).
Under the Federal Prompt Payment Act, government agencies must pay interest to vendors if payments are late — the current rate is about 4.625% (July–December 2025).
How to Use a Late Payment Calculator for Small Business
Enter your invoice amount, number of days overdue, and agreed interest rate.
Use this formula to find the interest:
Check your state laws, since some states limit how much interest you can charge. Make sure your contract clearly includes late fee or interest terms. Then, create a new invoice that shows the added interest or late fee.
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FAQ about the late payment calculator
How do I calculate interest on a late payment?
Interest = Principal × Annual rate × (Days late ÷ 365). Use invoice amount, agreed rate, and days overdue to compute interest.
What is the statutory interest rate for late invoices in the UK, US, or Canada?
In the UK, the statutory interest for late invoices is 8% above the Bank of England base rate; in the US, there is no uniform rate for private invoices, though the federal Prompt Payment Act sets 4.625% for government payments; in Canada, there’s no specific commercial rate, but the legal maximum interest is 60% per year.
Can I legally charge late payment fees for overdue invoices?
Yes — if your invoice terms allow it or statutory law applies. Check the contract & local/state law first.
How many days until a payment is considered late?
A payment is generally considered late 30 days after the invoice date in the UK, while in the US and Canada, it depends on the contract, though 30-day terms are commonly used.
What’s the difference between prompt payment interest and statutory interest?
Prompt payment interest (US) is for late payments under the Prompt Payment Act. Statutory interest (UK) is a legal rate (base rate + 8 %).
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