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

Millions of older Americans rely on Medicare to keep healthcare costs manageable. Even so, Medicare carries its own price tag, from deductibles to monthly premiums, and those costs can quietly strain a retirement budget. Most people look forward to enrolling when they turn 65, but that milestone tends to surface an equally important question: should you file for Social Security at the same time?

You become eligible for both programs at 65, yet claiming them together is rarely the only option and often not the best one. The two programs are linked but independent, and treating them separately can be worth thousands of dollars in lifetime benefits. A handful of key rules, understood before you file, can prevent some very costly surprises.

How Social Security Works and Why Waiting Pays Off

Social Security calculates your monthly retirement benefit from your earnings history, but your filing age shapes the final number just as powerfully. The SSA builds your benefit around your highest 35 years of indexed earnings, and that figure grows or shrinks depending on when you claim.

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 30%, leaving you with just 70% of your primary insurance amount for life. That cut is significant: the most recent data from the Senior Citizens League puts the average monthly benefit for retired workers at $2,084 as of June 2026, up from the SSA’s initial January 2026 estimate of $2,071 following the 2.8% cost-of-living adjustment.

The upside of patience is equally concrete. Delaying past FRA increases your benefit by 8% for each additional year you wait, up to age 70. Holding out the full three years beyond FRA adds a 24% total increase, and that larger base compounds with every future COLA. Filing for Social Security while enrolling in Medicare at 65 could lock in a permanently reduced amount, which is precisely why many financial planners treat the two decisions as separate questions.

2026 Medicare Costs and IRMAA Thresholds

Medicare expenses climbed again for 2026, and beneficiaries need to plan accordingly. The standard Part B premium rose to $202.90 per month, a jump of $17.90 from $185.00 in 2025, while the annual Part B deductible increased $26 to $283. For hospital stays, the Part A deductible is $1,736 per benefit period. Taken together, those figures represent one of the larger single-year cost increases beneficiaries have seen in recent years.

Higher earners face an additional layer of cost through the Income-Related Monthly Adjustment Amount (IRMAA). These surcharges begin for individuals with modified adjusted gross income above $109,000, or for joint filers above $218,000, based on tax returns from two years prior. So your 2026 premium is determined by what you reported to the IRS in 2024. One critical detail: IRMAA works as a cliff, not a sliding scale. Crossing a bracket threshold by even one dollar triggers the full surcharge for that tier. At the top income level, total monthly Part B premiums reach $689.90.

For beneficiaries already collecting Social Security, the premium math stings this year. The $17.90 monthly Part B increase consumes roughly a third of the average $56 monthly COLA gain, leaving many retirees with a smaller net purchasing-power gain 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 share.

The HSA Trap and the Earnings Test

If you are still employed at 65, pay close attention to how Medicare enrollment interacts with Health Savings Accounts. Enrolling in any part of Medicare, including premium-free Part A, immediately ends your ability to make further HSA contributions. The only way to preserve those tax-advantaged savings is to delay all Medicare enrollment, provided your employer coverage qualifies as creditable. Confirm that status before making any enrollment decisions, because the HSA door closes the moment you sign up for Part A alone.

Working while collecting benefits before FRA also subjects you to the retirement earnings test. For 2026, the annual exempt amount for those under FRA all year is $24,480. Social Security withholds $1 in benefits for every $2 you earn above that threshold. A 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, and only for the months before your FRA birthday. 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, though the arrangement creates a real cash-flow gap in the meantime.

There is also a notable legislative development on this front. The Senior Citizens’ Freedom to Work Act, introduced in 2026 by Sen. Rick Scott (R-FL) in March and Rep. Greg Murphy (R-NC) in April, would repeal the retirement earnings test entirely. Sen. Tommy Tuberville (R-AL) has joined as a Senate cosponsor. As of September 2026, the measure remains in committee with no floor vote scheduled, so the current rules remain in effect.

How to Sign Up for Medicare Alone

What trips up many people is the enrollment pathway itself: signing up for Medicare runs through the Social Security Administration’s website, not through Medicare directly. You enroll through your “my Social Security” account, the same portal where COLA notices and official correspondence arrive digitally. Crucially, the system allows you to enroll in Medicare without simultaneously filing for Social Security retirement benefits.

If you are still working at 65 with employer-sponsored coverage, you can elect Part A alone as secondary insurance at no cost while keeping your group plan primary. One practical point worth noting: if you enroll in Medicare without claiming Social Security, you pay your Part B premiums directly through a Medicare billing statement or automatic bank withdrawal, rather than having them deducted from a benefit check. That arrangement is straightforward once you know to expect it.

Once you do begin collecting Social Security, Part B premiums shift automatically to a monthly deduction from your benefit payment. Holding off and managing Medicare billing separately in the meantime is both financially sound and administratively simple. The two programs are designed to operate independently, and keeping your enrollment decisions separate gives you meaningful control over one of the most consequential financial choices in retirement.

Editor’s note: This pass updated the average monthly Social Security retirement benefit to $2,084, reflecting the June 2026 actual figure reported by the Senior Citizens League, compared with the SSA’s initial January 2026 estimate of $2,071. It also added Sen. Tommy Tuberville as a Senate cosponsor of the Senior Citizens’ Freedom to Work Act and updated the legislative status of that bill to reflect that it remains in committee with no floor vote scheduled as of September 2026.

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