• Base amount = Tax base + tax bases applied this month to the same tax and partner - non-taxable amount
• Withholding amount = (Base amount - immediately previous amount of the column 'S/ Exceeding $') * row percentage / 100 + row fixed amount ('$' column)
• If the base amount is lower than 0.0 then the withholding is 0.0
• If the withholding amount is lower than the minimum threshold on the tax then the final withholding amount is 0.0