Post Judgment Interest Calculator
Calculate post-judgment interest owed on legal judgments and court awards based on principal amount, annual interest rate, start date, and end date.
Understanding Post-Judgment Interest
Post-judgment interest is interest that accrues on a legal money judgment or court award from the date the judgment is officially entered until the date the debt is fully paid or settled. Statutory post-judgment interest rates are set by federal or state laws to compensate judgment creditors for delayed payment.
How Post-Judgment Interest is Calculated
Most jurisdictions compute post-judgment interest on a simple daily interest basis using a 365-day year convention:
$$\text{Daily Interest} = \frac{\text{Principal Judgment Amount} \times \text{Annual Statutory Rate}}{365}$$ $$\text{Total Accrued Interest} = \text{Daily Interest} \times \text{Total Accrual Days}$$When compounding applies, the total accrued interest over $t$ years is calculated as:
$$\text{Total Amount} = P \times \left(1 + r\right)^t$$ $$\text{Compounded Interest} = \text{Total Amount} - P$$Key Factors in Legal Judgment Interest
Several factors influence the total post-judgment payout amount:
- Principal Judgment Amount: The core monetary damages awarded by the court.
- Statutory Rate: The statutory interest rate prescribed by applicable state or federal law (e.g., US Federal post-judgment rate based on weekly 1-year constant maturity Treasury yield).
- Accrual Period: The exact calendar days elapsed between court entry and full settlement.
For general financial interest calculations, check out our Simple Interest Calculator and Compound Interest Calculator.
Frequently Asked Questions
What is the federal post-judgment interest rate?
Under 28 U.S.C. Section 1961, the US Federal post-judgment interest rate is equal to the weekly average 1-year constant maturity Treasury yield for the calendar week preceding the date of the judgment.
Does post-judgment interest compound?
In US federal courts, post-judgment interest compounds annually. In state courts, rules vary: some state laws mandate simple interest, while others require annual compounding.
When does post-judgment interest start accruing?
Post-judgment interest typically begins accruing on the date the court clerk enters the judgment into the official judicial record.
Can post-judgment interest rates change over time?
In most jurisdictions, the post-judgment interest rate is fixed at the rate in effect on the date of judgment entry for the entire duration of the debt payoff.
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