We can’t always say for sure because the credit reporting agencies (CRAs) develop and calculate their own proprietary credit scores that they then pass along to lenders. However, generally, a refinance application causes your lender to make a hard inquiry at the CRAs to request information about your credit report and history. These hard inquiries can typically cause a temporary drop in your credit score. Your score can also take a hit when you close your old mortgage as it impacts the mix of accounts that the CRAs consider when they calculate your credit score. As you pay off your new (refinanced) loan, your score can go back up assuming you suffer no other adverse impacts to your credit and you responsibly use your existing accounts (e.g., pay your monthly minimum payments for bills/loans on time). Please reach out to credit agencies if you have any questions or if you need more information.