Higher-income retirees pay a Medicare surcharge called IRMAA that can add hundreds of dollars a month to Part B and Part D.
Most retirees expect to pay a standard Medicare premium and leave it at that. But for higher-income households, Medicare tacks on an extra charge with an unfamiliar name and a real bite. It is called the income-related monthly adjustment amount, or IRMAA, and at the top of its scale it can add hundreds of dollars…