Adjustment.php

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<?php
namespace Magento\Tax\Pricing;

use Magento\Framework\Pricing\Adjustment\AdjustmentInterface;
use Magento\Framework\Pricing\SaleableInterface;
use Magento\Tax\Helper\Data as TaxHelper;

class Adjustment implements AdjustmentInterface
{
    const ADJUSTMENT_CODE = 'tax';

    protected $taxHelper;

    protected $catalogHelper;

    protected $sortOrder;

    public function __construct(TaxHelper $taxHelper, \Magento\Catalog\Helper\Data $catalogHelper, $sortOrder = null)
    {
        $this->taxHelper = $taxHelper;
        $this->catalogHelper = $catalogHelper;
        $this->sortOrder = $sortOrder;
    }

    public function getAdjustmentCode()
    {
        return self::ADJUSTMENT_CODE;
    }

    public function isIncludedInBasePrice()
    {
        return $this->taxHelper->priceIncludesTax();
    }

    public function isIncludedInDisplayPrice()
    {
        return $this->taxHelper->displayPriceIncludingTax() || $this->taxHelper->displayBothPrices();
    }

    public function extractAdjustment($amount, SaleableInterface $saleableItem, $context = [])
    {
        if ($this->taxHelper->priceIncludesTax()) {
            $adjustedAmount = $this->catalogHelper->getTaxPrice(
                $saleableItem,
                $amount,
                false,
                null,
                null,
                null,
                null,
                null,
                false
            );
            $result = $amount - $adjustedAmount;
        } else {
            $result = 0.;
        }
        return $result;
    }

    public function applyAdjustment($amount, SaleableInterface $saleableItem, $context = [])
    {
        return $this->catalogHelper->getTaxPrice(
            $saleableItem,
            $amount,
            true,
            null,
            null,
            null,
            null,
            null,
            false
        );
    }

    public function isExcludedWith($adjustmentCode)
    {
        return $this->getAdjustmentCode() === $adjustmentCode;
    }

    public function getSortOrder()
    {
        return $this->sortOrder;
    }
}