IRRRL stands for Interest Rate Reduction Refinancing Loan. You may see it referred to as a “Streamline” or a “VA to VA.” Except when refinancing an existing VA guaranteed adjustable rate mortgage (ARM) to a fixed rate, it must result in a lower interest rate. When refinancing from an existing VA ARM loan to a fixed rate, the interest rate may increase.
No appraisal or credit underwriting package is required by VA. You should be aware, however, that lenders may require an appraisal and credit report anyway.
A certificate of eligibility is not required. Your lender can use the VA’s e-mail confirmation procedure for interest rate reduction refinance in lieu of a certificate of eligibility.