How to add GST in invoice on web?

To create GST invoice, or to add GST in invoice, please follow the steps below:

The product should be added with tax.
If the tax is included in product, then only invoice will be created with tax.

To add product with tax,

Step 1: Please go to Products & Services.

Step 2: Click on +New Item.

Step 3: Enter product level details, including Tax/GST percentage.

Step 4: Click on Add Item.

Once the product added with GST, please refer to the below article to create an GST invoice by adding the same product added with GST.