How to Add sales tax in Customer Invoice

i want to add 16% sales tax in Customer Invoice please guide how to add tax in Sales Invoice

Read this section of the guides
Tax Codes: Create and use tax codes | Choose between tax-exclusive and tax-inclusive prices | Work with multi-component custom tax codes | Reverse charge VAT (Value Added Tax) | Make tax codes inactive | Adjust tax accounting for partial personal use

and
Business Localization: Add localized settings and features | Update localizations and report transformations

@Muhammad_Usman_Rana, almost any question you might ask, especially as a new user, is already answered in the Guides. They should be your first resource.

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