When creating an invoice, it doesn't automatically detect GST and IGST. I have to individually add 18% IGST or 9% each SGST

Hi sai-cochoa-in!

Thanks for reaching out to us. Allow me to help you in creating invoices and assigning the correct tax.

QuickBooks Online allows you to select a Place of Supply when creating an invoice. This is where the goods are delivered and used to determine if the transaction is inter or intra-state. 

We also need to verify the GST registration type. Go to the Sales menu, select Customers, then click the customer's name. Click the Edit button and you'll see the GST registration type drop-down.

Aside from your business location, the Place of Supply and the GST registration type are the factors you need to consider regarding which rate type you will see in transactions. You'll want to make sure that they are set up correctly. Please check these articles to understand more about how to manage your GST and IGST in QuickBooks Online:

• How do I apply IGST on my invoices? 
• Know more about GST registration type for customers in QuickBooks 
• How to apply GST registration type for customers and suppliers

Lastly, I added these articles if you need detailed steps in running GST-related reports and to answer other GST queries:

• GST reports in QuickBooks 
• How GST impacts QuickBooks users

You can always reply here if you have more questions about taxes. If you have other concerns like how to record a certain transaction or run a specific report, let me know. I'm here to help.