Go to the
Configuration menu > → System Values: Basic > → Tax Rates.
Click the Add button on top of the Tax Rates table. You will be directed to the Add Tax Rate page.
In the Name field, provide the name of the new tax rate.
In the Tax Percentage Value field, provide the value of the new tax.
Decide whether this tax rate should be Active and thus selectable.
Decide whether this tax rate should be marked as a Preferred Item and thus appear on top of the drop-down lists.
Decide whether this tax rate should be a Default one.
Click the Save button.
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