I am utilizing an Additional Charge module(Magento model 2.3.4), it doesn’t matter what state I choose on the cart web page, the tax will solely be calculated by Michigan tax fee.

Listed below are the Tax charges,

Right here is the video for higher understanding:- https://nimb.ws/248uAG

Tax is being calculated on,

Tax quantity = (Subtotal+Whole Extrafee)*Tax fee

I am overriding MagentoTaxModelSalesTotalQuoteTax class.

Vendor/ExtraFee/and so on/di.xml

<choice for="MagentoTaxModelSalesTotalQuoteTax" sort="VendorExtraFeeModelSalesTotalQuoteTax" />

Vendor/ExtraFee/Mannequin/Gross sales/Whole/Quote/Tax.php

<?php

 $enabled = $this->helperData->isModuleEnabled();
 if ($enabled) {
            $charge = $this->helperData->getExtrafee();
            $extraFeeTax = 0;
            $subtotal = $quote->getSubtotal();
            if (isset($fee[0])) {
                $charge = $subtotal + $charge;
                $extraFeeTax = ($fee[0] * $charge) / 100;
            } else {
                $classid =$quote->getCustomerTaxClassId();
                $taxRates = $this->_taxModelConfig->getCollection()->getData();

                $logger->data('classid');
                $logger->data($classid);

                $array_rates =array_column($taxRates, 'tax_calculation_rate_id');
                $tax_id = array_search($classid, $array_rates);
                if (isset($taxRates[$tax_id])) {
                    $taxData = $taxRates[$tax_id];
                    $fee = $taxData['rate'];

                    // $logger->data($taxData);
                    $logger->data($fee);
                }
                $charge = $subtotal + $charge;
                $extraFeeTax = ($fee * $charge) / 100;
            }
            $quantity = $quantity + $extraFeeTax;
            $total->setTotalAmount('tax', $quantity);
            $total->setExtraTax($extraFeeTax);
            $quote->setExtraTax($extraFeeTax);
        }

If anybody has any concepts, please let me know.