Based on the information available in your return, myTax will automatically display some tax offsets and adjustments.
To work out whether you need to select additional items on the Personalise return screen, see:
Credit for interest on early payments
If you wish to claim a credit for interest on early payments, you will need to select 'You are claiming tax offsets, adjustments or a credit for early payment' and then select this item.
If you are unsure if this item applies to you, read credit for interest on early payments.