The Tax Amount field is automatically populated using the selected Tax Code.
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The Tax Amount is calculated by multiplying the rate associated with the selected Tax Code by the line amount. This only occurs if the Taxable Code is set to S.
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This field can be edited for PO-based invoices if you are using the Costpoint Web Integration Console and the Taxable Code is S or U. Otherwise, the field is read-only. Contact your system administrator if you need to edit this field to modify the calculated tax amount.