Pre-Judgment Interest vs Post-Judgment Interest: What Every Plaintiff Needs to Know
- DB Forensic
- May 11
- 3 min read
When you are involved in a personal injury or compensation matter, the final figure on a settlement or court award is rarely the full story.
Interest can add a significant amount to what you are owed. But not all interest is the same, and the rules that govern it are more specific than most people realise.
Understanding the difference between pre-judgment and post-judgment interest can help you and your legal team make sure nothing is left on the table.
What Is Pre-Judgment Interest
Pre-judgment interest is interest that accrues on a damages amount from the time the loss occurred up to the date judgment is entered.
In New South Wales, it is governed by Section 6.12(8) of the Uniform Civil Procedure Rules 2005 and Section 100 of the Civil Procedure Act 2005.
The prescribed rate is set at 4% above the last cash rate published by the Reserve Bank of Australia before the relevant period commenced. It applies across two periods each year:
1 January to 30 June
1 July to 31 December
As a practical example, for the period from 1 July 2025 to 31 December 2025, the RBA cash rate was 3.85%, giving a pre-judgment interest rate of 7.85%.
This means that a plaintiff who suffered a loss several years ago is entitled to interest on past losses at rates that have varied considerably over that period.
What Is Post-Judgment Interest
Post-judgment interest applies from the date judgment is entered until the debt is paid.
It follows the same structure, but the margin above the cash rate is higher. Post-judgment interest is set at 6% above the last published RBA cash rate.
For the same period from 1 July to 31 December 2025, the post-judgment rate was 9.85%.
This higher rate is intentional. It is designed to encourage prompt payment of court awards. If a defendant delays paying after judgment, the debt grows faster.
Why the Difference Matters
The distinction between these two rates is important for a number of reasons.
First, the amounts can be significant. In matters where several years have passed since the date of injury or loss, pre-judgment interest can add tens of thousands of dollars to a claim. The longer the period and the higher the rate during that period, the greater the impact.
Second, the rates have changed substantially over time. Between 2021 and 2022, rates were at historically low levels, with pre-judgment interest as low as 4.10%. By mid-2023, that figure had risen to 8.10%. This means the timing of a judgment or settlement can affect the total amount of interest significantly.
Third, errors are common. If the wrong rates are applied, or if the periods are incorrectly identified, the final calculation will be wrong. This can disadvantage a plaintiff or create disputes that slow down resolution.
Interest Under the Civil Liability Act
It is also worth noting that a separate interest regime applies under Section 18 of the Civil Liability Act 2002. This provision uses the Commonwealth Government 10-year benchmark bond rate rather than the RBA cash rate.
This rate applies in specific circumstances and is updated twice yearly. For the period from 1 September 2025 to 28 February 2026, that rate was 4.12%.
The distinction between these two frameworks is not always well understood, and applying the wrong one to the wrong matter is a mistake that can undermine an otherwise accurate report.
Where Forensic Accountants Add Value
Calculating interest in litigation is not simply a matter of finding a rate and multiplying it out.
The starting point for pre-judgment interest, the applicable legislation, the correct rate for each period, and the specific heads of damage to which interest attaches all require careful analysis.
At DB Forensic, we regularly prepare and review interest calculations as part of economic loss reports and settlement analysis. We identify the correct framework, apply the right rates across each applicable period, and present the calculations clearly so that lawyers and their clients understand exactly how the figure was reached.
In matters where interest represents a material portion of the overall claim, this level of precision can make a real difference.
Want to Make Sure Your Interest Calculation Is Right
If you are preparing for a settlement or approaching judgment and want confidence that interest has been correctly calculated, it is worth having a forensic accountant review the numbers.
DB Forensic works with legal professionals and their clients across personal injury, workers compensation, and commercial disputes.
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