Medicare has hard deadlines with permanent penalties attached, and a surcharge that is calculated from a tax return you filed two years earlier. Both of these surprise people who did everything else right.
On this page
Deadlines that bind
The parts, briefly
- Part A, hospital insurance. Premium-free for most people with sufficient work history.
- Part B, medical insurance. Monthly premium, and the part that carries the late enrollment penalty.
- Part D, prescription drug coverage. Also carries a late enrollment penalty.
- Part C, Medicare Advantage. A private plan that replaces Original Medicare and can include drug coverage.
- Medigap, supplemental insurance that pairs with Original Medicare rather than with Advantage.
The enrollment deadline, and the penalty that never ends
Your Initial Enrollment Period runs for seven months: the three months before the month you turn 65, that month, and the three months after.
Miss it without qualifying coverage and the Part B late enrollment penalty is permanent. It is added to your premium for as long as you have Part B, not for a year. Part D has its own separate permanent penalty.
If you are still working at 65 and covered by an employer group health plan based on current employment, you can generally delay Part B without penalty and enroll later through a Special Enrollment Period. Two cautions that catch people:
- Retiree coverage and COBRA are not current employment coverage. They do not protect you from the penalty. The penalty is permanent.
- If you contribute to a health savings account, enrolling in any part of Medicare, including premium-free Part A, ends HSA contribution eligibility. Part A enrollment can also be applied retroactively for up to six months, which can create excess contributions after the fact. Stop HSA contributions in advance of enrolling.
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IRMAA: the two-year lookback
The Income Related Monthly Adjustment Amount is a surcharge on Part B and Part D premiums for higher-income beneficiaries. It is based on your modified adjusted gross income from two years earlier.
Two features make it painful. It is a cliff, not a phase-in: one dollar over a bracket threshold moves you into the higher surcharge for the entire year. And because of the lookback, the income that causes it is income you earned before you retired, or in a one-off year.
| Single | Married filing jointly | Part B each | Part D surcharge |
|---|---|---|---|
| Up to $109,000 | Up to $218,000 | $202.90 | None |
| $109,001 to $137,000 | $218,001 to $274,000 | $284.10 | $14.50 |
| $137,001 to $171,000 | $274,001 to $342,000 | $405.80 | $37.50 |
| $171,001 to $205,000 | $342,001 to $410,000 | $527.50 | $60.40 |
| $205,001 to $500,000 | $410,001 to $750,000 | $649.20 | $83.30 |
| Over $500,000 | $750,000 and over | $689.90 | $91.00 |
Events that regularly trigger an unexpected IRMAA bill two years later:
- Selling a business, or a second property
- A large Roth conversion
- A lump sum pension distribution
- Exercising options or vesting equity in a final working year
- A retirement package or accumulated leave payout
If your income has dropped because of a life-changing event, including retirement itself, you can ask Social Security to use current income instead by filing Form SSA-44. Work stoppage and work reduction are both listed events. If your income dropped because you retired, this form can remove the surcharge.
The Medigap decision has a deadline too
Your Medigap open enrollment period is the six months beginning when you are 65 and enrolled in Part B. During that window you can buy any Medigap policy sold in your area regardless of health.
Outside that window, insurers may use medical underwriting, subject to your state’s rules, which means a Medigap policy can be priced up or declined outright based on your health. New Jersey’s rules on this are specific, and they are the kind of thing worth confirming with the New Jersey Department of Banking and Insurance before a window closes rather than after. Do not let a six-month window lapse on the assumption that you can buy the same policy later.
The practical point: the choice between Medicare Advantage and Original Medicare with a Medigap policy is much easier to make at 65 than to reverse at 72. Switching from Advantage back to Original Medicare later can leave you needing a Medigap policy you may no longer be able to buy on the same terms. Treat the initial decision as more consequential than the annual open enrollment period suggests.
Employer coverage and a checklist
If you have retiree coverage from your employer
North Jersey’s large employers and public systems can provide retiree medical coverage, with eligibility rules of their own. Requirements can include a minimum age, a minimum service period, and being enrolled in the employer’s plan on your last day of active employment.
That last one is an eligibility gate, not a cost decision. Waiving employer coverage for a year in your late fifties, because a spouse’s plan was cheaper, can permanently disqualify you from retiree coverage worth far more.
Check your own employer’s rule before making any coverage change after age 50. See the Atlantic Health System page for a concrete example of how these gates are structured.
A checklist for the year you turn 65
- Mark your Initial Enrollment Period, starting three months before your birthday month.
- If you are still working, confirm in writing whether your coverage is based on current employment.
- Stop HSA contributions before enrolling in any part of Medicare.
- Decide between Advantage and Original Medicare plus Medigap while you have guaranteed issue rights.
- Check whether the income on the tax return from two years ago will trigger IRMAA, and whether Form SSA-44 applies to you.
- Confirm employer retiree coverage rules before changing any plan election.
This page is general educational information and does not account for your circumstances. Premiums, IRMAA brackets, and plan availability change every year, and state rules on Medigap differ. Confirm current figures and your own eligibility with Medicare.gov, the Social Security Administration, and your employer before acting.
Calculator. See which Medicare bracket your income falls in, and how much room is left before the next one. It uses published figures and names its source.
This page is general. Your situation is not.
The enrollment deadline carries a lifetime penalty, the Medigap window closes, and IRMAA is set by a return you filed two years earlier. All three reward acting early. We can cover it in a short conversation, at no charge and with no obligation.
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