I am trying to override the shipping tax amount for the for the checkout, eg:

enter image description here

I have created some custom shipping methods which are pulling in from Shipper HQ but I would like to change the VAT rate being used to calculated shipping. At the moment it's set to the standard 20% but I need to change it so that the Shipping Excl. Tax field will reflect the calculated VAT according my custom VAT rate, if that makes sense?

I have tried to manually change the shipping_tax_amount using the following code in the \Magento\Quote\Model\Quote\Address model:

foreach ($shippingRates as $shippingRate) {
    $rate = $this->_addressRateFactory->create()->importShippingRate($shippingRate);
    if (!$item) {

    if ($this->getShippingMethod() == $rate->getCode()) {
        if ($item) {
        } else {

            /** @var \Magento\Store\Api\Data\StoreInterface */
            $store = $this->storeManager->getStore();
            $amountPrice = $store->getBaseCurrency()
                ->convert($rate->getPrice(), $store->getCurrentCurrencyCode());


        $found = true;

But the values don't seem to change if try put an order through again re-calculating shipping rates etc.

I'd be really grateful for some help with this one. Cheers guys!

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