Hi @JJKiendday,
You'll receive your payment reference number (PRN) after you lodge your SGC statement, as a dedicated account will be created. You should be able to find your PRN through your ATO online services for businesses. If you've previously lodged SGC statements, then you'll use the same PRN as last time.
Regarding interest, the nominal interest component is calculated from the first day of the quarter to the:
- later of the quarterly due date, or
- date the quarterly SGC statement is received by us.
This means if you lodge your SGC statement after the due date, nominal interest will continue to accrue until the date you lodge the statement. Once you become liable to pay SGC, nominal interest accrues and by law cannot be reduced or waived.
You can minimise the general interest charge (GIC) that accrues on any outstanding SGC by making your payment straight away after lodging your statement.