Ask people what they will spend on housing in retirement and most can give you a number. Ask what they will spend on healthcare and you get a shrug, followed by the most expensive sentence in retirement planning: Medicare will cover it. Medicare is a genuinely good program, and turning 65 will probably cut your premiums compared to private coverage. But it is not free, it is not automatic for everyone, it does not cover the largest risks you face, and it punishes late arrivals with penalties that last the rest of your life. This guide explains the system the way a friend would: what the parts mean, what they cost, which deadlines actually matter, and how to wire all of it into your retirement plan while there is still time to do something about it.
Medicare has four parts, and the letters are the first place people get lost. Here is the whole structure in one table.
The practical takeaway is that there are really only two paths. Path one is Original Medicare: Part A plus Part B, almost always with a standalone Part D drug plan, and usually with a Medigap supplement policy to cap your exposure. Path two is Medicare Advantage: a Part C plan from a private insurer that bundles A, B, and usually D into one plan with its own network and rules. You must pick one path or the other, and as we will see, the choice is harder to reverse than most people realize.
Here is the honest budget conversation. Part A is premium-free for most people, because you prepaid it through payroll taxes over at least 10 years of work. Everything else has a price tag.
Part B's standard premium is roughly $200 a month in 2026, deducted straight from your Social Security check if you receive one, and it tends to rise most years. Part D plans vary widely by region and plan, from very cheap to north of $100 a month, and thanks to recent law your annual out-of-pocket spending on covered drugs is now capped at about $2,000 a year, indexed upward over time. Medigap premiums depend on your state, age, and plan letter, but a common range for a comprehensive policy is roughly $100 to $300 a month. Medicare Advantage plans often charge $0 on top of Part B, which is exactly why their ads are everywhere.
Add it up for one person on the Medigap path: roughly $200 for Part B, perhaps $40 for Part D, perhaps $175 for Medigap, and you are near $415 a month in premiums alone, before dental, vision, hearing, or any care Medicare does not cover. A couple doubles it. Over a 25-year retirement, premiums and out-of-pocket costs together routinely run well into six figures per person, which is why the wave-of-the-hand approach to healthcare in a retirement plan is so dangerous. The number is big, but it is budgetable, and budgetable is the whole game.
Medicare enrollment is built around windows, and the penalties for missing them are unusual in American finance: they are not one-time fees, they are permanent surcharges.
Your Initial Enrollment Period is seven months long: the three months before your 65th birthday month, your birthday month, and the three months after. If you are already receiving Social Security, you are enrolled in A and B automatically. Everyone else has to act.
Miss the window without qualifying employer coverage and two bad things happen. First, you may wait months for coverage to begin through the General Enrollment Period. Second, your Part B premium goes up 10 percent for each full 12-month period you were eligible but not enrolled, and that surcharge applies for the rest of your life. Be five years late and you pay 50 percent extra on every Part B premium, forever. Part D has its own smaller lifetime penalty that accrues monthly. These are not technicalities; hundreds of thousands of people pay enrollment penalties today.
The one big exception: if you or your spouse are still actively working at 65 with group coverage from an employer of 20 or more employees, you can delay Part B penalty-free and enroll through a Special Enrollment Period when the job or coverage ends. Two traps hide inside that exception. COBRA does not count as active employer coverage, and neither does retiree health coverage, so the clock starts when work stops, not when those run out. And if your employer has fewer than 20 employees, Medicare is generally primary at 65 whether you enrolled or not, which can leave you effectively uninsured while believing you are covered.
Here is the deadline that matters more than any other for the rest of your retirement, and it is buried in fine print: your Medigap open enrollment period. For six months starting the month you are 65 or older and enrolled in Part B, insurers must sell you any Medigap policy they offer, at standard rates, regardless of your health. No questions, no underwriting, no exclusions.
After those six months, in most states, the door closes. Insurers can ask about your health, charge you more, or decline you outright. A handful of states guarantee ongoing access, but most do not. This is why the popular advice to try a zero-premium Medicare Advantage plan first and switch to Original Medicare later if you do not like it is so risky. You can always switch back to Original Medicare during an annual enrollment window, but you may not be able to get the Medigap policy that makes Original Medicare financially safe, because by then you might have the very health conditions that made you want to switch. Choose your path at 65 as if it is permanent. For healthy people it technically is not, but you should not count on staying healthy; that is the entire premise of insurance.
Strip away the marketing and the choice looks like this. Medicare Advantage gives you lower fixed costs now: often a $0 premium, plus extras like dental allowances and gym memberships. In exchange you accept a provider network, referral and prior-authorization rules, and an annual out-of-pocket maximum that can run several thousand dollars in a bad year. Original Medicare plus Medigap costs real premium money every month whether you are sick or not, and in exchange you get close to total freedom: any doctor or hospital in the country that accepts Medicare, very little paperwork, and highly predictable costs in a serious illness.
One common framing that holds up well: Medicare Advantage front-loads your savings into the healthy years, while Medigap front-loads your costs to protect the sick years. People who travel between states, split the year between two homes, or want access to specific major medical centers tend to value Medigap's flexibility. People with tight monthly budgets and strong local provider networks often do well in Advantage plans, especially in metro areas with competitive plan markets. There is no universally right answer, but there is a universally wrong process: picking the plan with the best television commercial without reading the provider directory and the drug formulary first.
Because the path choice is so consequential, you should know exactly which doors stay open after 65. Every fall, from October 15 to December 7, you can switch Medicare Advantage plans, switch Part D plans, move from Original Medicare into an Advantage plan, or drop an Advantage plan and return to Original Medicare for the following year. There is also a Medicare Advantage open enrollment window from January 1 to March 31 each year, during which people already in an Advantage plan can change plans once or return to Original Medicare. What none of those windows guarantee is the Medigap policy that makes Original Medicare financially safe, because outside your original six-month window, underwriting applies in most states.
Two trial rights soften this. If you joined a Medicare Advantage plan when you first became eligible at 65, you have 12 months to change your mind and buy a Medigap policy with guaranteed issue. The same protection applies if you dropped a Medigap policy to try an Advantage plan for the first time and want to come back within 12 months. After that first year, you are relying on your health or on living in one of the few states that require insurers to take you. The planning rule that falls out of all this: treat your first year on Medicare as the test drive, and make the keep-or-switch decision before the trial right expires, not after.
If your income in retirement is comfortable, Medicare charges you more for the same coverage. The mechanism is called the Income-Related Monthly Adjustment Amount, or IRMAA, and it adds surcharges to both Part B and Part D premiums above certain income thresholds, starting at roughly $109,000 of modified adjusted gross income for a single filer and roughly $218,000 for joint filers in 2026. At the highest brackets the surcharges can more than triple your Part B premium.
The detail that catches planners off guard is the two-year lookback: your 2026 premiums are set by your 2024 tax return. That turns ordinary retirement moves into premium events. A large Roth conversion at 63, a big capital gain from selling a rental property, or a final-year severance package can all push your Medicare premiums up two years later. Worse, IRMAA is a cliff, not a ramp: crossing a threshold by a single dollar of income triggers the full surcharge for the entire year, for both spouses if you file jointly. The fixes are mostly about timing: spread Roth conversions across more years and watch the thresholds, harvest big gains before the lookback window opens, and remember that qualified charitable distributions from an IRA after age 70 and a half reduce the income that feeds IRMAA. Retirees doing multi-year Roth conversion plans should put the IRMAA thresholds on the same worksheet as the tax brackets, because converting to the top of a tax bracket can quietly sail past a premium threshold that costs more than the bracket saved. If your income genuinely dropped because you retired, married, divorced, or were widowed, you can appeal the surcharge with form SSA-44 and ask Social Security to use your current, lower income instead. Appeals on those grounds succeed routinely; do not pay a surcharge based on a salary you no longer earn.
Now the part of the conversation most Medicare articles whisper: the program's exclusions are where your biggest risks live.
If you are reading this before 65, you have access to the single most tax-favored account in the code for exactly this bill: a health savings account. Contributions are deductible, growth is tax-free, and withdrawals for qualified medical costs are tax-free, including, after 65, Medicare Part B, Part D, and Advantage premiums plus your deductibles and copays. The 2026 contribution limit is $4,400 for self-only coverage, more for family coverage, plus a $1,000 catch-up from age 55.
The play is simple: while working, contribute to the HSA through a qualifying high-deductible health plan, invest the balance instead of spending it, and pay current medical bills out of pocket when you can afford to. Use the calculator below to see what a steady HSA habit becomes by 65. One hard rule: HSA contributions must stop once you enroll in any part of Medicare, and if you enroll in Part A after 65 it can be backdated up to six months, so stop contributions six months before a delayed enrollment to avoid excess-contribution penalties.
Every early-retirement plan has to cross the same bridge: the years between employer coverage and Medicare. The main options are COBRA, which keeps your old plan for up to 18 months at full unsubsidized cost, a marketplace plan through HealthCare.gov, where premium tax credits depend on your income and can be substantial for early retirees living off savings, or coverage through a spouse who is still working. The marketplace route rewards income planning: keeping your taxable income modest in the gap years, for example by spending from cash and taxable accounts rather than big pre-tax withdrawals, can cut your premiums dramatically. Whatever you choose, price this bridge before you set a retirement date. For a 62-year-old couple, three years of pre-Medicare coverage can easily be a five-figure annual line item, and discovering that after you resign is the wrong order of operations.
Finally, the planning step that turns all of this into a budget line. Take the path you are leaning toward and price a full year of it. On the Medigap path from our earlier example, roughly $415 a month in premiums is about $4,980 a year, plus the Part B deductible, modest Part D cost sharing that the law now caps near $2,000 in a heavy year, and out-of-pocket dental, vision, and hearing that commonly run $1,000 to $2,000. Call it roughly $7,000 to $9,000 per person in a normal-to-heavy year, before long-term care. On the Advantage path, premiums may be near zero, but a serious illness can take you to the plan's out-of-pocket maximum of several thousand dollars, so an honest budget carries the average of good and bad years rather than the good-year number the premium suggests.
Then make the number retirement-proof. Healthcare costs have historically grown faster than general inflation, so inflate this line item more aggressively than the rest of your budget in any long-range plan. A couple budgeting $15,000 a year today should not be surprised to need a meaningfully larger figure a decade in, even before any change in health. The retirees who handle this well are not the ones who guessed the future correctly; they are the ones who gave healthcare its own line, its own inflation rate, and its own funding source, then reviewed it annually like any other bill.
Here is the sequence to follow as 65 approaches, starting about a year out.
Medicare rewards people who show up prepared and quietly charges everyone else. None of this is hard once it is laid out; it is just unforgiving of improvisation. Put the enrollment dates on your calendar, decide the Medigap-versus-Advantage question deliberately during your one guaranteed window, manage the income that feeds IRMAA, and fund the gaps the program was never designed to cover. Do those four things and healthcare in retirement stops being a fog and becomes what it should have been all along: a line item, with a number, in a plan you control.
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Find the career your brain was built forMostly no. Part A (hospital coverage) is premium-free for most people who worked and paid Medicare taxes for at least 10 years, but it still has a deductible per benefit period. Part B carries a monthly premium of roughly $200 in 2026, Part D drug plans charge their own premiums, and you will likely want Medigap or Medicare Advantage on top. A realistic planning figure is several hundred dollars per person per month before any care is received.
It depends on the size of your employer. If you have group coverage from an employer with 20 or more employees, you can usually delay Part B without penalty and enroll later through a Special Enrollment Period when that coverage ends. If the employer has fewer than 20 employees, Medicare generally becomes primary at 65 and you should enroll on time. COBRA and retiree coverage do not count as active employer coverage for penalty purposes, which catches many people.
Medigap supplements Original Medicare: you keep nationwide access to any provider that accepts Medicare, and the policy fills most cost-sharing gaps in exchange for a meaningful monthly premium. Medicare Advantage replaces how you receive your benefits with a private plan that typically has a low or zero premium, a provider network, prior authorization rules, and an annual out-of-pocket maximum. Lower fixed costs versus broader access is the core trade.
The big one is long-term custodial care, meaning help with bathing, dressing, and daily living in a facility or at home, which Medicare does not pay for beyond limited skilled-care stays after a hospitalization. Routine dental, vision, and hearing are also excluded from Original Medicare, along with care outside the United States in most cases. These gaps, not premiums, are where the largest retirement healthcare risks live.
IRMAA is an income-related surcharge added to Part B and Part D premiums for higher-income retirees, based on your modified adjusted gross income from two years prior. You can sometimes reduce it by managing taxable income, for example spreading Roth conversions across years, and you can appeal it with form SSA-44 if your income dropped because of a life-changing event such as retirement itself.
Yes, and it is one of the best uses of an HSA. After 65 you can pay Part B, Part D, and Medicare Advantage premiums, plus deductibles and copays, with tax-free HSA dollars. Medigap premiums are the notable exception. Just remember that once you are enrolled in any part of Medicare you can no longer contribute to an HSA, so the funding has to happen before.
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