Issue
The bank interest amount is not showing at G3 of the Activity Statement Report.
Explanation
The Interest amount is an Input Taxed Supply.
For interest received by the SMSF, it is reported both at G1 (Total Sales) and G4 (Input Taxed Sales) and not at G3 (GST Free Sales).
For bank interest paid by the SMSF or bank fees charged to the fund, these are reported at G11 (Non-capital purchases) and G14 (Purchases without GST in the price).
For further clarification you can refer to the ATO website for information on Common BAS errors - Business Portal: General problems and solutions.