Your 2028 Medicare Premium Is Being Written Now by the Income You Create Before December 31.

Your 2026 retirement decisions - such as Roth conversions, capital gains, or RMDs - will influence your 2028 Medicare premiums. These calculations use a two-year lookback period, meaning the income you create before December 31 will determine your premiums in 2028. Crossing the $137,000 single filer threshold adds a $1,736 surcharge to your Medicare Part B and D premiums annually.

A widow switching from a joint to a single filing can jump two IRMAA tiers with the same income. The SSA cannot undo voluntary income events like Roth conversions. Financial professionals often prioritize sales over wealth creation, but fiduciary advisors are legally obligated to put your interests first. Advisor.com's tool can connect you with vetted fiduciaries in just three minutes.

For example, a 66-year-old Ohio widow plans to convert $90,000 to a Roth in December. This conversion, along with her pension, investment income, and taxable Social Security, will factor into the 2026 return that Social Security uses to set her 2028 Medicare premiums. The exact cost is still unknown but crossing the income threshold could make this decision one of her most impactful in retirement.