The final premium could still change, but a projected $850 annual boost could give retirees a valuable opportunity to strengthen their finances. Here's how to take full advantage.Retirees could keep most of the projected raise after a potential Medicare increase. The standard Part B premium is currently $202.90 per month (6), but it's projected to reach $209.50 (7) in 2027. If both estimates hold, roughly $64 of the $71 monthly COLA boost would remain after the additional Part B cost.Slower inflation is wel ...