Interest & Total Due
$82.19
Interest for 60 days at 10%
| Component | Amount |
|---|
| Principal | $5,000.00 |
| Interest | $82.19 |
| Total Owed | $5,082.19 |
Why is this number?
Using the formula: Interest = $5,000 × (10% / 360) × 60 days = $83.33 (approximately, depending on rounding). The actual calculation values are shown in the breakdown.
What does this result mean?
This is the additional amount you are entitled to charge (or owe) beyond the original principal due to the delay in payment, based on the interest rate and days past due you entered.
What should I do next?
Include a clear interest clause in your contracts. Send a demand letter with the calculated amount. If the amount is significant, consider consulting legal counsel about local statutory limits.
Late Payment Interest: Your Rights and Calculations
When a payment is overdue, interest can accumulate quickly. Many contracts, invoices, and legal statutes allow creditors to charge interest on late payments as compensation for the time value of money. This Late Payment Interest Calculator helps you determine the exact amount owed, whether you are a business chasing a delinquent invoice or a consumer facing a penalty.
The standard formula for simple interest is Interest = Principal × Annual Rate × (Days / 360 or 365). Compound interest, which adds interest to the principal at regular intervals, can result in a higher total if the delay is long enough. Most jurisdictions default to simple interest unless a contract specifically provides for compounding. The "Banker's Rule" (360-day year) is widely used in commercial loans and invoice late fees.
Statutory Interest Rates
Many states have a legal interest rate for judgments or late payments. For example, New York's statutory rate is 9%, while California uses 10% for most contracts. Federal judgments use the weekly average 1-year Treasury yield plus a margin. Always check your local laws before applying interest charges. Courts may disallow interest that exceeds usury limits or was not disclosed in the original agreement.
Best Practices for Invoicing
- State the rate clearly: Your invoice or contract should specify the annual interest rate and how it is calculated (simple/compound, 365/360 day basis).
- Send reminders: A friendly payment reminder before adding interest can preserve business relationships.
- Calculate accurately: Use this calculator to avoid undercharging or overcharging, which can lead to disputes.
- Keep records: Document the dates and amounts of each interest calculation.
Late Payment Interest FAQ
How is late payment interest calculated?Interest = Principal × Annual Rate × (Days Past Due / Days in Year). For compound interest, the formula is Principal × ((1 + Daily Rate)^Days - 1).
What is the legal rate of interest on late payments?It varies by jurisdiction. In many U.S. states, the statutory rate is 6-10% per year. For federal judgments, it's based on the Treasury rate plus a margin.
Can I use a 360-day basis?Yes, many commercial loans use a 360-day year for simplicity. This tool lets you choose between 365 and 360 days.
Is compound interest allowed on late payments?Compound interest is generally allowed only if specified in the contract or by statute. Simple interest is the default in most cases.
Does this tool account for partial payments?No, this calculator assumes a single lump-sum overdue amount. For complex scenarios, consult a financial professional.
How do I determine the days past due?Count from the day after the payment was due through the date you are calculating. Use the date pickers or enter the number of days directly.