As you are now gaining tax deductions from your investment, rather than waiting until the end of the financial year to receive a refund, you are able to reduce the tax that your employer deducts from your salary each time you get paid.
To do this you need an accountant to prepare a tax variation, which is submitted to the ATO. Once the ATO advises you of your new taxable rate, you can give this to your employer and they will reduce the amount of tax they are witholding accordingly.