How to Handle Medicare While Still Working

More than 11 million Americans now work past their 65th birthday, and Medicare is one of the most confusing parts of doing so. The rules around Medicare and employer coverage are written in a way that creates expensive mistakes, including lifelong penalties of 10 percent per year added to your premium for as long as you live. Understanding the basics before you turn 65, or as soon as possible after, can save you thousands of dollars and a lot of stress. The Medicare and You handbook from the federal government runs 120 pages. This guide walks through the parts that matter most for working seniors in plain English.

Medicare has four parts. Part A covers hospital stays and is free for most people once you have worked enough quarters. Part B covers doctor visits and tests and costs $185 a month in 2026 (more if your income is higher). Part C is Medicare Advantage, a private plan that bundles A, B, and often D. Part D covers prescription drugs and costs $0 to $80 a month depending on the plan and your income. Medigap (Supplemental) is a private add-on that pays the gaps Part B leaves behind. If you keep working past 65 and your employer offers good health insurance, you may delay Part B and Part D without penalty as long as the employer plan is "creditable coverage" through an employer with 20 or more workers. If the employer has fewer than 20 workers, Medicare becomes your main insurance at 65 whether you enroll or not, and missing the enrollment window leads to a lifetime penalty.

The biggest mistake working seniors make is one of two opposite errors. Error one: signing up for Medicare Part B and Part D when employer coverage is already good, paying double premiums for years. Error two: skipping Medicare Part B entirely while working for a small company under 20 workers, leaving a gap that turns into denied claims, then triggering a 10 percent penalty per year of delay added to the Part B premium for life. The right answer depends on three numbers: your age, the size of your employer, and the quality of your employer health plan. Walking through these three numbers in order with a free Medicare counselor (called a SHIP counselor, free in every state) is the single best investment of two hours you can make.

One fact that surprises many people: if you have a Health Savings Account (HSA) through your employer and you enroll in any part of Medicare, including the free Part A, you must stop contributing to the HSA right away. The IRS does not allow HSA contributions once you have Medicare. If you plan to keep working and keep funding an HSA, you must delay Part A enrollment too. To delay Part A, you must also delay claiming Social Security retirement benefits, because anyone claiming Social Security at 65 is automatically enrolled in Part A. This three-way connection between Social Security, Medicare Part A, and your HSA trips up tens of thousands of working seniors each year. The steps below walk through the decisions in order.