Family Law Interest Calculator

Help with the 3 key inputs above
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Date From: The date from which interest accrues (Calculator starts from 1 July 2010)
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Amount: This is the Australian dollar value amount of the judgment which is subject to the interest calculation.
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How the Family Law Interest Calculator works:
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Interest is calculated using the following methodology contained in the Family Law Rules 2004 Rule 17.03 Rate of Interest being:
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1. in respect of the period 29 March 2004 to 30 June 2010. This calculator does not use the Family Law rate prior to 1 July 2010.

2. from 1 July 2010, in respect of the period from 1 January to 30 June in any year – the rate that is 6% above the cash rate last published by the Reserve Bank of Australia before that period commenced, and

3. from 1 July 2010, in respect of the period from 1 July to 31 December in any year – the rate that is 6% above the cash rate last published by the Reserve Bank of Australia before that period commenced

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Family Law interest is calculated by reference to the Reserve Bank of Australia Cash Rate plus 6% calculated in six month periods. Interest is calculated on a simple basis (not compounding).
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The Family Law Interest Calculator has been updated to include the RBA Cash Rate up to 30 June 20254. Next Update: 1 July 2025