You can add tax charges (GST, VAT) to your ticket sales. Below is the detailed instruction to add the tax to the ticket type.
Go to My Events>>Edit Event>> Setup>> Invoice & Tax>> Tax Settting.

Open the Tax Collection icon to setup Tax collection on event ticket sales.
And fill in the following details.
Tax Name: Choose which kind of tax you want to collect (GST or VAT)
Tax Rate: Specify the rate of the tax in percentage
Tax Registration No.: Your corporation's tax registration number
Tax Calculation Options: Choose whether the tax is exclusive or inclusive of the ticket price.

Select the ticket type you want to apply the tax.
Notes: You can choose more than one ticket or choose all the tickets type
Click on Save Changes to save all the setups
Below image is the tax-inclusive ticket price (in which the tax charge is included in the ticket price) that appeared on the registration site.
Below image is the tax-exclusive ticket price (to which the tax charge is added on top of the ticket price) that appeared on the registration site.