Magento – Magento2 get tax rate on product view page

First of all check if your taxes are set as they should and the rules are applied. During the checkout do you see the right taxes?

Then you can debug by looking at Mage_Tax_Model_Calculation::getRate(), first lines of code are:

        if (!$request->getCountryId() || !$request->getCustomerClassId() || !$request->getProductClassId()) {
            return 0;
        }

Then dig deeper if this is OK.

The following code will:

1. Load a customer address and get the country id e.g. "US" or "DE"
2. Load a collection of all tax rates for that given country

Note that $customer_id should be a relevant customer id and you could use the current logged in customer. Also note that getDefaultBillingAddress is not always set for a customer.

$oCustomer = Mage::getModel('customer/customer')->load($customer_id);
$oAddress = $oCustomer->getDefaultBillingAddress();

/* @var $oTaxRateCollection Mage_Tax_Model_Resource_Calculation_Rate_Collection */
$oTaxRateCollection = Mage::getResourceModel('tax/calculation_rate_collection');
$oTaxRateCollection->addFieldToFilter('tax_country_id', $oAddress->getCountryId());