You can include calculated tax in your Item's displayed price in the Store.
Tax Inclusive Pricing is currently supported for Ticket Types and Sessions in 19-R1. It is not supported in versions 18-R2 and lower. Please upgrade to 19-R1 or higher to enable Tax Inclusive Pricing for Ticket Types and Sessions.
Navigate to the Store record you want to apply tax inclusive pricing to.
Click Edit. The Edit Store modal will open.
In the Payment section, check Enable Tax Inclusive Pricing.
Click Save. All items in the store will be updated with the Tax Inclusive Price.
If you want to view the price with tax included, navigate to the Price Rule records for an individual item. Under Details, locate the tax inclusive price in the Tax Inclusive Price field.