This is a type of sales tax adopted by many Canadian provinces that combines the traditional Goods and Services Tax (GST) and Provincial Sales Tax (PST) or Quebec Sales Tax (QST) into a single tax amount.

This field is activated via the Settings > Invoice Processing > Capture Profiles > Field Settings. You can also provide formatting and validation settings here.

The HarmonisedSalesTax can be stated on an invoice on top of GST and ProvincialSalesTax/QuebecSalesTax as a tax in its own right. This means that the system needs to capture all three tax components for an invoice to pass.

If the Extract HST Separately setting in the Settings > Invoice Processing > Capture Profiles > Tax Settings > Tax Settings tabs table is selected, the TaxAmount1 field is used for GST and the HarmonisedSalesTax field is used for the harmonized sales tax value.

If the above setting is cleared, the TaxAmount1 field collects the Harmonized Sales Tax value and the HarmonisedSalesTax field is always zero. In addition, if both GST and Harmonized Sales Tax are present on a document, it is routed to the Validation activity so that the tax values can be reviewed and then corrected as necessary.

During invoice amount validation, the values of HarmonisedSalesTax, ProvincialSalesTax or QuebecSalesTax, and the regular tax field, are added together in the background to form the total tax liability of an invoice. During document export, the tax amount is the sum of the regular tax field, the HarmonisedSalesTax, and the ProvincialSalesTax or QuebecSalesTax fields.