Hi lopresti,
Preparing and lodging the IAS in QuickBooks Online is the same as preparing your BAS. If you've enabled PAYG Instalments in the GST center you can enter your Income tax installment amount.
Here's how to enable the PAYG INstalments:
- Click on the GST tab.
- Click on the Settings button, and select Tax settings.
- Locate PAYG Instalments, and set the Lodging frequency and Instalment method.
- Click on Save.
If you need to lodge the BAS period say Jan - March, the GST center will show a Prepare IAS button to lodge January IAS, and then after you lodge January IAS, the GST page will show the February IAS period outstanding and Prepare IAS option will show. After you've lodged your IAS, you'll be able to lodge your BAS for the said period.
Also, you can check this link on how to lodge BAS or IAS in QuickBooks Online.
Feel free to post again in the Community if you have questions about QuickBooks Online!