If a variation of the instalment amount is too complex you should seek out a local tax agent to do this for you. (their fee is tax deductible). See how to vary below
How to vary your PAYG instalments | Australian Taxation Office
"When you lodge your tax return, the PAYG instalments you have paid during the year are offset against your tax,...,"
Starting PAYG instalments | Australian Taxation Office
Instalments paid and not used after your tax return has been processed will be refunded.
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