
Still Funding Your HSA After 65? How Medicare's Six-Month Lookback Turns Legal Contributions Into Excess Contributions
Enrolling in Medicare Part A after age 65 backdates coverage up to six months, turning HSA contributions made during that window into excess contributions subject to a 6% yearly excise tax. This guide covers the 2026 prorated limits, the Form 5329 penalty, how to withdraw the excess before the filing deadline, and the six-months-ahead shutdown plan.










