2027 Medicare Costs: What We Know Now—and What Seniors Are Still Waiting For

Anyone trying to build a retirement budget for next year is dealing with an awkward Medicare calendar: some important 2027 numbers are available, while others are still coming. The Centers for Medicare & Medicaid Services (CMS) has already released several Part D figures and Medicare Advantage payment policies, but final average Medicare Advantage and Part D plan premiums are expected in September. Meanwhile, seniors are still waiting for major 2027 Medicare costs such as the standard Part B premium and deductible that can directly affect monthly budgets. That means estimates circulating online should not automatically be treated as the amount beneficiaries will actually pay. Instead, retirees can track a handful of official indicators now and prepare their budgets for several possible outcomes.

The key is knowing which numbers are final, which are plan-specific, and which are still projections. A CMS payment announcement for insurers, for example, is not the same thing as a beneficiary’s premium, while a national Part D calculation is not necessarily what an individual will pay each month. That being said, here are several things you should be keeping your eye on between now and Open Enrollment.

Watch the Part B Premium, but Don’t Budget From a Projection Yet

The standard Part B premium is one of the biggest 2027 Medicare costs to watch because most beneficiaries pay it every month, including people enrolled in Medicare Advantage. In 2026, the standard premium is $202.90 per month, up from $185 in 2025, while the annual Part B deductible increased from $257 to $283. Medicare’s 2026 Trustees Report, released June 9, provides actuarial projections for future Medicare finances, but projections should not be confused with the final premium announcement. CMS did not announce the final 2026 Part B premium until November 14, 2025, which illustrates why August estimates for the following year can still change.

Okay, but what does Part B cost? 

2026 Part B premium: Official
2027 Part B estimate from actuarial projections: Projection
Final 2027 Part B premium: Not yet announced

Part D Already Offers Some Concrete 2027 Numbers

Prescription coverage is one area where beneficiaries already have meaningful information about 2027 Medicare costs. CMS announced that the 2027 national average monthly bid amount for Part D will be $296.05 and the national base beneficiary premium will be $41.33. The base beneficiary premium is not, however, the premium every Medicare beneficiary will see on a bill because it serves as a starting point in calculating plan-specific basic premiums. Individual Part D premiums vary based on plan bids and other factors, so seeing “$41.33” should not lead someone to assume that will be their monthly prescription premium.

Think of the $41.33 figure as part of Medicare’s premium-calculation machinery, not a nationwide sticker price for Part D plans. Final average Medicare Advantage and Part D premiums and the 2027 plan landscape are scheduled for release in mid-to-late September, making that an important period for retirees to watch.

A Temporary Part D Premium Program Is Ending After 2026

Another change worth watching involves the Part D Premium Stabilization Demonstration, a temporary program CMS introduced for standalone prescription drug plans beginning in 2025 as the redesigned Part D benefit took effect. CMS announced in July that the demonstration will end after 2026, saying plan sponsors now have sufficient experience under the redesigned benefit to develop their 2027 bids under traditional market conditions.

That does not tell an individual beneficiary whether their prescription-plan premium will rise or fall next year. It does, however, give retirees another reason to pay close attention when finalized 2027 plan premiums become available in September rather than assuming this year’s Part D pricing will simply carry forward. Anyone with standalone prescription coverage should compare the actual premium, formulary, pharmacy network, deductible, and expected annual drug spending once 2027 plans become available.

Compare Drug Spending, Not Just Drug Plan Premiums

Monthly premiums are only one piece of what prescription coverage can cost a retiree during a full year. The Part D benefit changed substantially in recent years, including an annual out-of-pocket threshold of $2,100 for covered Part D drugs in 2026, up from the $2,000 threshold established for 2025. CMS has also finalized rules that continue the redesigned Part D structure into 2027 and beyond, including no enrollee cost sharing for covered drugs once the catastrophic phase is reached.

Don’t compare drug plans on premium alone. Formulary placement, pharmacy choice, deductible and cost-sharing could easily matter more to an individual beneficiary than a small premium difference.

A 2.48% Medicare Advantage Payment Increase Does Not Mean Your Premium Is Rising 2.48%

Another number that could easily cause confusion is the 2.48% increase CMS projects in payments to Medicare Advantage plans for 2027. The agency estimates its finalized payment policies will produce an increase of more than $13 billion to Medicare Advantage plans, or 2.48%, before accounting for estimated risk-score trends. That does not mean every beneficiary’s Medicare Advantage premium will rise 2.48%, nor does it guarantee that an individual’s costs will fall by that amount. The number describes projected federal payments to Medicare Advantage plans, not a uniform price change being passed directly to beneficiaries. Plans still determine their offerings, premiums, cost-sharing structures, provider networks, and supplemental benefits within Medicare’s requirements.

Higher-Income Retirees Should Keep IRMAA on Their Radar

Some retirees need to watch another expense that can substantially increase both Part B and Part D costs: the Income-Related Monthly Adjustment Amount, commonly called IRMAA. In 2026, higher Medicare premiums begin when modified adjusted gross income exceeds $109,000 for an individual filer or $218,000 for a married couple filing jointly. Approximately 8% of people with Medicare Part D pay income-related adjustment amounts, according to CMS. Someone who had an unusually high-income year because of a large retirement-account withdrawal, property sale, or other taxable event should therefore pay special attention when the 2027 income thresholds and surcharges are finalized. If Social Security determines IRMAA applies, beneficiaries receive a notice explaining the determination and their appeal rights.

Your Social Security COLA Matters to the Medicare Math

For many retirees, Medicare premiums and Social Security benefits are connected in a very practical way because the Part B premium is often deducted directly from the monthly Social Security payment. The 2026 Social Security cost-of-living adjustment was 2.8%, but the 2027 COLA has not yet been officially announced. That makes it risky to build a January household budget around both an estimated COLA and an estimated Part B premium, since neither final number is available yet. A better exercise is to calculate what your monthly cash flow would look like under several scenarios, such as a $10, $20, or $30 increase in Part B costs.

Put These Medicare Dates on Your Fall Calendar

Several of the numbers retirees need for 2027 planning will become clearer over the next few months. CMS says it expects to release final average Medicare Advantage and Part D premiums along with the 2027 plan landscape in mid-to-late September, giving beneficiaries more information about the plans available for next year. Social Security says the 2027 cost-of-living adjustment will be announced in October, another important number for beneficiaries whose Medicare Part B premiums are deducted from their Social Security payments.

Medicare Open Enrollment then runs from October 15 through December 7, when beneficiaries can make eligible changes to Medicare Advantage and prescription drug coverage for January. The final Part B premium and deductible are another announcement to watch because those figures can directly affect monthly retirement budgets.

Build a Medicare Watchlist Instead of Chasing Every Estimate

Between now and fall, seniors can keep a simple checklist of the 2027 Medicare costs that matter most to their own finances: Part B premiums and deductibles, Part D premiums, drug costs, Medicare Advantage expenses, Medigap premiums, and potential IRMAA surcharges. Medigap deserves separate attention because premiums vary by insurer, plan, and location rather than being set as one nationwide Medicare premium. CMS says it expects to release the final average Medicare Advantage and Part D premiums and plan landscape in September, giving beneficiaries more concrete information before fall enrollment decisions. Until the remaining official rates are published, separating confirmed numbers from estimates is one of the simplest ways to avoid unnecessary worry and bad budgeting assumptions.

Which 2027 Medicare costs are you watching most closely as you plan next year’s retirement budget? How will these impact you? 

Sources: CMS 2027 Part D National Average Monthly Bid Information · CMS 2027 Medicare Advantage and Part D Rate Announcement · CMS 2027 Medicare Advantage and Part D Final Rule · 2026 Medicare Trustees Report · 2026 Medicare Parts A & B Premiums and Deductibles · Medicare Medigap Costs · Social Security COLA Information

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