Magento 2.3.5 Estimate Shipping should be apply on Subtotal (Incl.tax)

When table-rates looks at the price it always looks at the tax-exclusive price and ignores promotional discounts as well.

Even though if the client wants to calculate based on subtotal with inclusive tax,

create plugin here, Class MagentoQuoteModelQuoteAddress method: requestShippingRates

Manipulate the value of $request->setPackageValue($item ? $item->getBaseRowTotal() : $this->getBaseSubtotal());

Thanks

found this:

vendormagentomodule-taxModelSalesTotalQuoteCommonTaxCollector.php Line 596FF

$address = $shippingAssignment->getShipping()->getAddress();

$address->setBaseSubtotalTotalInclTax($baseSubtotalInclTax);

$address->setSubtotal($total->getSubtotal());

$address->setBaseSubtotal($total->getBaseSubtotal());

removed

$address->setSubtotal($total->getSubtotal());

$address->setBaseSubtotal($total->getBaseSubtotal());

Hope it will work for you.