NerdWallet's award winners are chosen through a rigorous evaluation process involving more than four dozen of our writers and editors. NerdWallet's ratings formulas for credit cards, for example, consider the type of card being reviewed (such as cash back, travel or balance transfer) and the card's rates, fees, rewards and other features. For mortgages, our evaluation includes loan types, loan products, online capabilities, online rate information, customer service and complaints filed with the Consumer Financial Protection Bureau. For more info, see our methodologies.