Order tax rounding issue

In /vendor/magento/module-sales/view/adminhtml/templates/order/create/totals/tax.phtml

 <td class="admin__total-amount">
     <?= /* @noEscape */ $block->formatPrice($block->getTotal()->getValue()) ?>
 </td>

I would like to found getTotal function to fix rounding issue, I’m using canadian tax and there’s 2 taxes for Quebec for example:

Taxe:   5.9825$ 
T.V.Q. (9.975%) 3.985014$
T.P.S. (5%) 1.997501$

I like to change function that calculate total tax, so i will add the 2 taxes with rounded values
I searched in all Magento files
i found those

./vendor/magento/module-sales/Api/Data/ShippingInterface.php:47: public function getTotal(); ./vendor/magento/module-sales/Model/Order/ShippingBuilder.php:105: private function getTotal() ./vendor/magento/module-sales/Model/Order/Shipping.php:32: public function getTotal() ./vendor/magento/module-sales/Block/Order/Totals.php:271: public function getTotal($code) ./vendor/magento/framework/Search/Response/QueryResponse.php:89: public function getTotal(): int ./vendor/magento/magento2-base/setup/src/Magento/Setup/Model/Installer/Progress.php:77: public function getTotal() ./vendor/magento/module-multishipping/Block/Checkout/Overview.php:292: public function getTotal() ./vendor/vertex/sdk/src/Services/Quote/Response.php:145: public function getTotal() ./vendor/vertex/sdk/src/Services/Quote/ResponseInterface.php:115: public function getTotal(); ./vendor/vertex/module-tax/Api/Data/LogEntryInterface.php:101: public function getTotal(); ./vendor/vertex/module-tax/Model/Data/LogEntry.php:141: public function getTotal() ./setup/src/Magento/Setup/Model/Installer/Progress.php:77: public function getTotal()