No. As is the case throughout all aspects of the Medicare program, IRMAA rates are determined for an individual, not for a couple. While the combined income of you and your spouse may be used to determine whether you are required to pay IRMAA, what you have to pay is always individual. That means that if you and your spouse are both enrolled in Part B or Part D, then if one person has IRMAA added to their individual premiums, your spouse will have IRMAA added to their individual premiums as well.