Turning 65 in 2026 does not automatically mean you should enroll in Medicare on your birthday. Roughly 11,000 Americans turn 65 every day, and a large share of them are still working, covered by a spouse's plan, or holding onto a Marketplace policy they like. The right answer to should I apply for Medicare depends on exactly what other coverage you have, how large your employer is, and whether you are already collecting Social Security. Get it wrong in either direction and the consequences are expensive: apply for Part B when you already have solid employer coverage and you pay for two overlapping insurance plans, while delaying past your Initial Enrollment Period without qualifying coverage triggers a Part B penalty of 10 percent for every 12-month period you waited, permanently, for the rest of your life. Medicare eligibility itself starts at 65 for most people, or earlier for those who receive Social Security Disability Insurance for 24 months or have End-Stage Renal Disease or ALS, and each path carries its own enrollment clock.
Six factors decide whether you should apply now or delay: your current coverage type, your employer's size, whether you are already collecting Social Security, your household income, your prescription drug needs, and whether you contribute to a Health Savings Account. This guide walks through each factor, the exact documents you need to prove employer coverage for a penalty-free delay, the Medicare Savings Programs and Extra Help that can reduce your costs if your income falls under the Federal Poverty Level thresholds shown below, and the state-specific Medigap timing rules that matter once you do enroll. COBRA continuation coverage, retiree health plans, and Affordable Care Act Marketplace plans all feel like real insurance, but none of them count as active employer coverage under Medicare's delay rule, which is the single most expensive misunderstanding people make at 65. Compare your Medicare eligibility date against your employer's exact headcount before you decide to wait, and confirm whether a Medicare Savings Program could make Part B effectively free. Most of the decisions in this guide are permanent once made, so work through the full framework before your Initial Enrollment Period closes.
6 Steps to Get Coverage
Common Mistakes That Cost People Thousands
The five most expensive Medicare enrollment mistakes, most of which are permanent once made:
- Assuming COBRA or retiree health coverage lets you delay Part B without penalty. Neither counts as active employer coverage under the Special Enrollment Period rule, so most people on these plans should enroll in Medicare on time.
- Not confirming your employer has 20 or more employees before delaying Part B. Smaller employers usually require Medicare to become your primary coverage at 65, making a delay costly.
- Continuing HSA contributions after enrolling in Part A. Part A enrollment is retroactive up to 6 months, and contributions made during that look-back window can trigger IRS tax penalties.
- Delaying Part D drug coverage without other creditable coverage. Even one day past the 63-day gap creates a 1 percent per month penalty added to your premium for life.
- Assuming Medicare Advantage enrollment works the same as delaying Part B. Medicare Advantage requires you to already have both Part A and Part B, so delaying Part B also delays your Medicare Advantage eligibility.
Do You Have Qualifying Employer Coverage? Here Is How to Tell
Qualifying employer coverage is the single term that decides whether you can delay Medicare without penalty. Active group health coverage from a current employer with 20 or more employees qualifies. Coverage from a spouse's active employer plan at a 20+ employee company also qualifies, since Medicare's rule looks at either your own or your spouse's current employment. What does not qualify: COBRA continuation coverage, retiree health benefits from a former employer, VA coverage, TRICARE for retirees, or an Affordable Care Act Marketplace plan. Once you or your spouse stop actively working, or your employer drops below 20 employees, that qualifying life event starts the clock on your 8-month Special Enrollment Period, regardless of whether you still have COBRA or retiree coverage available. Ask your HR or benefits department for two things now, even if you plan to delay for years: written confirmation of your employer's size, and Form CMS-L564 (Request for Employment Information), which your employer must sign before Social Security will process your eventual Special Enrollment Period application.
- Qualifies: Active group coverage from your own or your spouse's current employer with 20+ employees
- Does not qualify: COBRA continuation coverage
- Does not qualify: Retiree health benefits from a former employer
- Does not qualify: Individual ACA Marketplace plans
- Does not qualify: TRICARE for Life or VA coverage alone
Medicare Savings Programs and Extra Help If Your Income Is Low
Medicare Savings Programs pay some or all of your Part B premium and cost-sharing if your income falls under certain Federal Poverty Level thresholds, and qualifying for one automatically enrolls you in Extra Help for prescription drug costs. The Qualified Medicare Beneficiary (QMB) program, the most generous tier, pays your Part B premium and eliminates most Medicare cost-sharing entirely for incomes at or under 100 percent of the 2026 Federal Poverty Level. The Specified Low-Income Medicare Beneficiary (SLMB) and Qualifying Individual (QI) programs pay only the Part B premium at higher income tiers. Extra Help, also called the Low-Income Subsidy, caps your Part D drug copays at a few dollars per prescription for incomes up to roughly 150 percent of the Federal Poverty Level. Apply through your state Medicaid agency, called Medi-Cal in California, MassHealth in Massachusetts, or TennCare in Tennessee depending on where you live, for a Medicare Savings Program, or through ssa.gov or that same state Medicaid agency for Extra Help. Both applications are free, year-round, and do not require you to have already enrolled in Medicare.
Medicare Savings Program and Extra Help monthly income guidelines, 2026 (48 contiguous states + DC)| Household size | QMB (100% FPL) | SLMB (120% FPL) | QI (135% FPL) | Extra Help/LIS (approx. 150% FPL) |
|---|
| 1 | $1,350/mo | $1,616/mo | $1,816/mo | approx. $2,015/mo |
| 2 | $1,824/mo | $2,184/mo | $2,455/mo | approx. $2,725/mo |
| 3 | $2,297/mo | $2,752/mo | $3,094/mo | approx. $3,435/mo |
| 4 | $2,770/mo | $3,320/mo | $3,733/mo | approx. $4,145/mo |
| Each additional person | + $473/mo | + $568/mo | + $639/mo | + $710/mo |
Figures include the standard $20/month general income disregard SSA and state Medicaid agencies apply on top of the 2026 Federal Poverty Level. Alaska and Hawaii have higher thresholds. Modest asset limits also apply; confirm current limits with your state Medicaid agency.
Source: HHS ASPE 2026 Poverty Guidelines; CMS/NCOA 2026 Medicare Savings Programs Coverage and Eligibility guidance
State Birthday and Anniversary Rules for Switching Medigap Plans
Federal law guarantees you a one-time 6-month Medigap Open Enrollment window when you first turn 65 and enroll in Part B. After that window closes, a handful of states give you a recurring, no-underwriting opportunity to switch Medigap plans every year, which matters directly to your should-I-apply decision if you expect your health or budget to change. California gives Medigap policyholders a 60-day window beginning on their birthday to switch to an equal-or-lesser plan with any insurer. Oregon runs a similar 30-day-before, 30-day-after birthday window. Missouri instead ties its rule to your policy's purchase anniversary rather than your birthday, with a 30-day-before, 30-day-after window for a same-letter plan switch. Illinois limits its 45-day birthday window to policyholders between ages 65 and 75, and only for a same-issuer switch. If you live outside these states, plan your Medigap purchase carefully during your initial guaranteed-issue window, because most states offer no recurring no-underwriting opportunity afterward.
What Happens If You Enroll Late
Missing your Initial Enrollment Period and any applicable Special Enrollment Period pushes you into the General Enrollment Period, which runs January 1 through March 31 each year, with coverage not starting until July 1 of that year. That gap can leave you uninsured for up to 6 months. On top of the coverage gap, Part B carries a permanent late enrollment penalty of 10 percent for every full 12-month period you were eligible but did not enroll, added to your premium for the rest of your life. At the 2026 standard Part B premium of $202.90 per month, two years of delay adds roughly $40 extra every month, forever. Part D carries a separate 1 percent per month penalty for every month you went without creditable drug coverage after first becoming eligible. Both penalties are calculated by Social Security and Medicare, are non-negotiable, and almost never get waived except in narrow cases like proven employer misinformation.
Frequently Asked Questions
Should I apply for Medicare if I'm still working at 65?
Your answer depends on your employer's size and coverage type. If your employer has 20 or more employees and you have active group health coverage, you can delay Part B penalty-free and take only premium-free Part A, saving the 2026 Part B premium of $202.90 per month until you retire. If your employer has fewer than 20 employees, Medicare typically becomes your primary coverage at 65, and you should enroll in both Part A and Part B during your 7-month Initial Enrollment Period. Confirm your exact employer headcount with HR before deciding, since getting this wrong triggers a permanent Part B late enrollment penalty.
What documents do I need to delay Medicare because of employer coverage?
You need Form CMS-L564 (Request for Employment Information), which your current or most recent employer must complete and sign to confirm your coverage dates and employer size. You will submit this alongside Form CMS-40B (Application for Enrollment in Medicare Part B) when you eventually apply through your Special Enrollment Period. Request these forms from HR while you are still employed, since tracking down a former employer months or years later can delay your application and put you at risk of missing your 8-month enrollment window after coverage ends.
What happens if I miss my Medicare enrollment window entirely?
You have to wait for the General Enrollment Period, which runs January 1 through March 31 each year, and your coverage will not start until July 1 of that year, potentially leaving you uninsured for months. On top of the coverage gap, Part B carries a permanent penalty of 10 percent for every full 12-month period you were eligible but unenrolled, added to your premium for life. Part D carries a similar 1 percent per month penalty. Neither penalty typically gets waived, so tracking your correct enrollment window matters more than almost any other Medicare decision.
Can Medicare coverage be retroactive if I apply late?
Part A can be retroactive up to 6 months from your application date, but not earlier than the first month you were eligible, which matters most for people who delay both Parts A and B while contributing to a Health Savings Account. Part B enrolled during your Initial Enrollment Period starts based on when in the 7-month window you sign up; enrolling in the 3 months before your birthday starts coverage your birthday month, while enrolling later delays your start date. Part B has no retroactive coverage if you enroll late through the General Enrollment Period.
Should I apply for Medicare if I already have COBRA or retiree health coverage?
Yes, in almost every case. Neither COBRA continuation coverage nor retiree health benefits from a former employer counts as active employer coverage under Medicare's delay rule, even though both function like real insurance day to day. If you rely on COBRA or retiree coverage past your Initial Enrollment Period without also enrolling in Medicare, you will face the permanent Part B late enrollment penalty when you eventually sign up. Apply for Medicare on time and then coordinate it with your COBRA or retiree plan, which usually becomes secondary coverage once Medicare starts.
Do state rules affect when I can switch my Medigap plan?
Yes, in a handful of states. California and Oregon give Medigap policyholders a birthday window (60 days and 30 days before/after, respectively) to switch to an equal-or-lesser plan without medical underwriting. Missouri offers a similar 30-day-before, 30-day-after window tied to your policy's purchase anniversary rather than your birthday. Illinois limits its 45-day birthday window to ages 65 through 75. Outside these states, your only federally guaranteed no-underwriting window is the 6 months following your initial Part B enrollment at 65, so plan your first Medigap purchase carefully.
Do I qualify for a Medicare Savings Program or Extra Help based on my income?
You likely qualify if your household income falls under roughly 100 to 150 percent of the 2026 Federal Poverty Level, depending on which program tier applies. The Qualified Medicare Beneficiary (QMB) program, the most generous, pays your Part B premium and most cost-sharing at incomes at or under 100 percent FPL. Extra Help, which caps your Part D drug copays, extends to roughly 150 percent FPL. Modest asset limits also apply. Apply through your state Medicaid agency, since qualifying can make Medicare essentially free even if you initially assumed you could not afford it.
What happens to my HSA if I apply for Medicare?
Enrolling in any part of Medicare, including premium-free Part A, stops you from making further contributions to a Health Savings Account. Because Part A enrollment is retroactive up to 6 months, you should stop HSA contributions at least 6 months before you plan to enroll, or you risk an IRS excess-contribution penalty on the overlapping months. If you are still working past 65 and want to keep contributing to your HSA, you must delay both Part A and Part B, which is only advisable if you have qualifying employer coverage and no immediate need for Medicare benefits.
