If you have a standalone Medicare drug plan, the premium you pay in January is probably going to look different from the one you paid in December. Not because your plan changed its mind about you, but because a temporary federal cushion that has been holding those premiums down expires on the last day of this year.
Most people will not hear about this until the bill arrives. That is the expensive way to find out.
The subsidy nobody told you about
Back in 2025, Medicare rolled out something called the Part D Premium Stabilization Demonstration. The name is a mouthful, but the mechanics were simple. Prescription drug plan premiums were about to spike because of benefit changes required by the Inflation Reduction Act, so the government stepped in and paid part of the tab.
For 2026, that program knocked a flat $10 per month off standalone drug plan premiums and capped how much any single plan could raise its premium year over year at $50 a month.
On July 28, 2026, the Centers for Medicare and Medicaid Services announced the demonstration is ending on December 31, 2026. CMS said drug plan sponsors now have enough experience with the redesigned benefit to price it on their own, so the program goes back to what the agency calls traditional market conditions.
Translated: the $10 discount goes away, and so does the ceiling on increases. Starting January 1, 2027, whatever your plan wants to charge is what you pay.
What the numbers actually say
Two figures from that CMS release are worth writing down.
The national base beneficiary premium, which is the starting point for calculating what any given plan charges for basic coverage, goes from $38.99 in 2026 to $41.33 in 2027. That is a modest bump, and it is modest on purpose. The Inflation Reduction Act caps growth in that number at 6 percent a year through 2029.
The second figure is the one that should get your attention. The national average monthly bid amount, which is what plans told the government they expect basic drug coverage to cost, is $296.05 for 2027. For 2026 it was $239.27. That is a jump of nearly 24 percent in a single year.
You do not pay the bid amount directly. It sets the size of the government’s subsidy to plans, and the capped base premium absorbs part of the shock. But when plans collectively say their costs are running a quarter higher than last year, and the program that was smoothing over the difference just ended, the gap has to land somewhere. It lands in individual plan premiums, deductibles, and the tier your specific drugs sit on.
Doing nothing is a choice, and it costs money
Here is the part that frustrates me every fall. Medicare drug plans change their formularies, premiums, deductibles, and pharmacy networks every single year, and the enrollment system will happily roll you into the new version of your old plan without asking.
Plenty of people let it happen. KFF found that 69 percent of standalone Part D enrollees did not compare their drug coverage against other plans in their area, and nearly 7 in 10 Medicare beneficiaries overall skipped comparing coverage altogether during a recent open enrollment period. Historically, only about 10 to 13 percent of people in standalone drug plans voluntarily switch in a given year.
In a normal year, coasting costs you a little. In a year when a subsidy disappears and the cap on increases lifts at the same time, coasting could cost real money.
Open enrollment runs from October 15 to December 7, 2026, and anything you change takes effect January 1. CMS plans to publish the full 2027 plan lineup, with actual premiums and copays, in mid to late September.
How to compare plans in about an hour
Watch your mailbox in late September for a document called the Annual Notice of Change. Your plan is required to send it, and it spells out exactly what is moving for next year. Read the premium line, the deductible line, and the drug list. That last one matters most, because a drug moving from a preferred tier to a nonpreferred tier can cost you more than a premium increase ever would.
Then go to the Medicare Plan Finder and enter every prescription you take, with the dose and the pharmacy you actually use. Not approximately. Exactly. The tool prices your specific list against every plan in your ZIP code and shows estimated annual cost, which is the number that counts. A plan with a $0 premium and a $615 deductible can easily beat one with a $30 premium and no deductible, or lose badly to it, depending entirely on which pills you swallow.
Also check whether your pharmacy is in the preferred network. Same drug, same plan, different counter, different price. If you use a mail order pharmacy, price that separately.
If comparing plans on a website is not how you want to spend an evening, every state has free counselors through the State Health Insurance Assistance Program. You can find yours at shiphelp.org. They do not sell insurance and they do not earn commissions.
If the cheapest plan still stings
A few programs exist for exactly this situation, and they go underused.
Extra Help, formally the Low Income Subsidy, pays part or all of your Part D premium and deductible and caps what you pay per prescription. Income and asset limits apply, but they are higher than most people assume, and the Social Security Administration takes applications year round. Medicare Savings Programs, run through your state Medicaid office, can cover your Part B premium, which frees up cash whether or not your drug plan changes.
There is also the Medicare Prescription Payment Plan, which lets you spread your out of pocket drug costs across the calendar year in level monthly payments instead of getting hit with a $900 bill in February. It does not reduce what you owe and it charges no interest or fees. It just smooths the timing, which for anyone on a fixed monthly income is worth something.
And remember the Inflation Reduction Act put a hard annual cap on what you pay out of pocket for covered drugs under Part D. It started at $2,000 in 2025 and sits at $2,100 for 2026, indexed upward each year. Once you hit it, your plan covers 100 percent of your covered prescriptions for the rest of the year. That cap does not go away when the premium demonstration does.
Bank the difference, don’t absorb it
Say you compare plans in October and find one that saves you $22 a month. The temptation is to let that money quietly disappear into groceries. Instead, move it. Set up an automatic transfer from checking to a savings account for the same amount on the same day your Social Security deposit lands. Over a year that is $264 sitting in an account earning interest instead of vanishing into the household budget.
Do the same thing with the Part B premium if a Medicare Savings Program picks it up. Money you were already spending is the easiest money to save, because your budget never learned to miss it.
One last thing about timing. If you check in late September and your Annual Notice of Change shows a premium you can live with, you are allowed to do nothing. Confirming a decision is not the same as ignoring one. Just make sure you looked.
