I’m 65 and Signing Up for Medicare. What Happens if I’m Not Ready for Social Security?

Millions of older Americans depend on Medicare to make healthcare affordable. Even so, Medicare brings its own costs that can stretch retirement budgets, from deductibles to monthly premiums. Most seniors look forward to enrolling when they turn 65, but that milestone raises an important question: should you claim Social Security at the same time?

You are eligible for both at 65, yet claiming them together is not always the right move. Understanding how these programs work independently can save you thousands in lifetime benefits, and knowing a few key rules before you file can prevent some costly surprises.

How Social Security Works and Why Waiting Pays Off

Social Security calculates your monthly retirement benefit using your earnings history, but your filing age plays an equally critical role. The SSA bases your benefit on your highest 35 years of indexed earnings, and that figure can shrink or grow significantly depending on when you choose to file.

Claiming before full retirement age (FRA) permanently reduces your benefit. For anyone born in 1960 or later, FRA is 67. File at 62 and your monthly payment drops by a full 30%, leaving you with just 70% of your primary insurance amount for life. That is a meaningful reduction given that the average retired worker collects $2,071 per month after the 2026 cost-of-living adjustment, up from $2,015 the prior year.

Filing for Social Security while enrolling in Medicare at 65 could lock in that reduction permanently. The flip side is more encouraging: delaying past your FRA increases your benefit by 8% for each year you wait, up to age 70. Hold out the full three years beyond FRA and you pocket a 24% total increase, and that larger base compounds with every future COLA adjustment.

2026 Medicare Costs and IRMAA Thresholds

Medicare expenses climbed again for 2026, and beneficiaries need to budget carefully. The standard Part B premium now stands at $202.90 per month, an increase of $17.90 from $185.00 in 2025, while the annual deductible rose $26 to $283. For hospital stays, the Part A deductible is $1,736 per benefit period.

Higher earners face an additional cost layer through the Income-Related Monthly Adjustment Amount (IRMAA). These surcharges kick in for individuals with modified adjusted gross income above $109,000 or joint filers above $218,000, based on income from two years prior. One important detail: IRMAA operates like a cliff system, meaning crossing a threshold by even one dollar triggers the full surcharge for that tier. At the top income bracket, total monthly Part B premiums can reach $689.90.

For beneficiaries already collecting Social Security, the premium math is especially pointed this year. The $17.90 per month Part B increase eats up roughly a third of the average $56 monthly COLA gain, leaving many retirees with a net purchasing power increase smaller than the headline 2.8% figure suggests. For those still working and weighing when to file, that squeeze reinforces the case for delaying Social Security to maximize the baseline benefit before Medicare costs take their bite.

The HSA Trap and Earnings Test

If you are still employed at 65, pay close attention to how Medicare enrollment affects Health Savings Accounts. Once you enroll in any part of Medicare, including premium-free Part A, you lose the ability to make further HSA contributions. To preserve those tax-advantaged savings, you must delay all Medicare enrollment, provided your employer coverage qualifies as creditable. Confirm that it does before making any enrollment moves, because the door closes even if you sign up for Part A alone.

Working while collecting benefits before FRA also subjects you to the retirement earnings test. For 2026, the limit for those under FRA all year is $24,480. Social Security withholds $1 in benefits for every $2 you earn above that threshold. A separate, more generous limit applies in the calendar year you actually reach FRA: the threshold rises to $65,160, with only $1 withheld per $3 of excess earnings. The test disappears entirely the month you hit FRA. Withheld dollars are not permanently lost; the SSA recalculates your benefit at FRA to credit back the months of reduction, but the arrangement creates a real cash-flow squeeze in the meantime.

There is also a notable legislative backdrop. A bicameral Republican bill, the Senior Citizens’ Freedom to Work Act introduced in 2026 by Sen. Rick Scott (R-FL) in the Senate and Rep. Greg Murphy (R-NC) in the House, would repeal the retirement earnings test entirely. The proposal has been referred to committee but has not yet advanced, so the current rules remain in effect for now.

How to Sign Up for Medicare Alone

What confuses many people about signing up for Medicare is that the process runs through the Social Security Administration’s website. You enroll via your “my Social Security” account, the same portal where COLA notices and other official correspondence now arrive digitally. Crucially, the system lets you enroll in Medicare without filing for Social Security at the same time.

If you are still working at 65 with employer-sponsored coverage, you can elect Part A alone as secondary insurance at no cost. One practical point: if you enroll in Medicare without claiming Social Security, you pay your Part B premiums directly through billing or automatic bank withdrawal rather than having them deducted from a benefit check.

Once you do start Social Security, Part B premiums are automatically deducted from your monthly benefit. But if you do not yet need the Social Security income, holding off and managing Medicare separately is a straightforward and financially sound approach. The two decisions are linked but independent, and treating them that way gives you more control over one of the most consequential choices in retirement planning.

Editor’s note: This pass corrected the description of the Senior Citizens’ Freedom to Work Act from “bipartisan” to “bicameral Republican,” reflecting that both Sen. Rick Scott (R-FL) and Rep. Greg Murphy (R-NC) are Republicans. It also added context on IRMAA’s cliff-system structure and clarified that earnings-test withheld dollars are recouped through a benefit recalculation at FRA rather than a lump-sum refund.

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