How is «discount_tax_compensation_amount» calculated?

discount_tax_compensation_amount is calculated in 4 places.

• If catalog prices entered from Magento Admin do not include tax, then discount_tax_compensation_amount is always 0:
  • Magento\Tax\Model\Calculation<b>AbstractAggregateCalculator::calculateWithTaxNotInPrice()
  • Magento\Tax\Model\Calculation<b>UnitBaseCalculator::calculateWithTaxNotInPrice()
• If catalog prices entered from Magento Admin include tax, then discount_tax_compensation_amount can have a non-zero value:
  • Magento\Tax\Model\Calculation<b>AbstractAggregateCalculator::calculateWithTaxInPrice()
  • Magento\Tax\Model\Calculation<b>UnitBaseCalculator::calculateWithTaxInPrice()

See also:

• How does Magento\Tax\Model\Calculation\AbstractCalculator decide whether to use calculateWithTaxInPrice() or calculateWithTaxNotInPrice() method?

See also:

• How is hidden_tax_amount calculated in Magento 1.x?