The Medicare Part D Trap for 2027: Still Working Past 65? Read This.
Sometime around this time of year, your employer's benefits department is supposed to send you a letter.
Most people will skim it — or ignore it entirely.
But that letter, the annual Notice of Creditable Coverage, just became one of the most important pieces of mail you'll receive this year.
Because starting in 2027, the rules behind it are getting stricter, and a lot of people who are “covered at work” are about to discover their prescription drug coverage doesn't count the way they assumed it did.
If you're 65 or older and still on an employer health plan, this one is for you. The penalty for getting it wrong isn't a fine you pay once. It's a surcharge on your Medicare drug premium that lasts for the rest of your life.
Before we go further: healthcare costs are the single hardest line item to get right in a retirement plan, and small coverage mistakes like this one are exactly what a fiduciary planning process is designed to catch.
If you'd like a second set of eyes on your retirement and healthcare-cost strategy, Parkmount offers a free strategy call — no charge, no obligation.
The Short Answer: What Changed for 2027?
The short answer is this: Medicare now requires your employer drug plan to be better for it to count as a reason to delay Part D enrollment.
Under the old test, an employer plan qualified as “creditable coverage” if it was designed to pay, on average, at least 60% of participants' prescription drug costs. Starting with plan years beginning January 1, 2027, that threshold jumps to 73% — and the old 60% test is retired entirely.
According to WTW's 2027 open enrollment compliance briefing, employers relying on the simplified test must re-validate every plan option before the October 15 notice deadline.
Here's why that matters to you personally: if your employer plan fails the new test, the months you spend on it no longer protect you from Medicare's late enrollment penalty.
You could be racking up penalty months right now — while fully believing you're covered.
How the Part D Late Enrollment Penalty Actually Works
Let's get concrete, because the math is what makes this real.
Medicare's formula is simple: 1% of the national base beneficiary premium, multiplied by every full month you went without Part D or other creditable drug coverage.
The result is rounded to the nearest ten cents and added to your monthly Part D premium — permanently. The National Council on Aging's breakdown of the Part D penalty confirms the penalty lasts for as long as you have Part D coverage, even if you switch plans, and that the dollar amount is recalculated each year as the base premium changes.
Walk through a realistic example. Say you work until 68 on an employer plan you never confirmed was creditable for the drug portion. That's 36 months uncovered.
36 months × 1% = a permanent 36% surcharge on your Part D premium. Not for a year — for the entire time you're enrolled in Part D, which for a healthy retiree could be 25 or 30 years. With the 2027 base beneficiary premium at $41.33, that's roughly $14.90 extra every month, and it grows as premiums grow.
It doesn't reset. It doesn't go away once you finally enroll. It's baked into your premium from that point forward — whether or not you take a single prescription.
The 2027 Rule Change Nobody Told You About
Why is this a 2027 story and not just evergreen advice? Because the bar moved.
The Inflation Reduction Act redesigned the Part D benefit — adding the annual out-of-pocket cap and simplifying cost-sharing — which made Medicare's own drug coverage substantially more generous. CMS's old yardstick for measuring employer plans against it, the 2009-era 60% test, no longer reflected reality.
So the test was rewritten: 72% for 2026, 73% for 2027, with the percentage expected to keep rising in future years.
Benefits firm Hylant's advisory to employers puts it plainly: some plans that qualify as creditable today may not qualify in 2027 without design changes — and the test must be run separately for each benefit option, so your company's PPO might pass while its high-deductible plan fails.
And that's the group most at risk: high-deductible health plans, especially paired with an HSA. If your plan makes you pay several thousand dollars out of pocket before it covers prescriptions, that's a tough comparison against a Medicare benefit that caps your annual drug spending at a couple thousand dollars. Not every high-deductible plan will fail — but a meaningful share of plans that passed the old test won't pass the new one.
Here's the uncomfortable irony: the people most likely to be caught are the careful planners — the ones who chose the HSA-eligible plan precisely because they were optimizing taxes and saving diligently. Diligence in one part of the plan created exposure in another. That's how these gotchas work.
Who's Most at Risk (And Probably Doesn't Know It)
This isn't just about traditional employees working past 65. The exposure shows up in places people don't think to check:
Still working past 65 on an employer plan — especially a high-deductible/HSA plan you picked years ago and never re-examined.
Business owners who haven't “formally retired” — if you're on the company plan and past 65, the same rules apply to you.
Executives on phased retirement — reduced hours, same plan, same blind spot.
The spouse on the other spouse's plan — your coverage is only as creditable as their employer's drug benefit. If their plan fails the 73% test, so does your protection.
Anyone whose employer changed carriers or plan designs recently — the
plan that was creditable last year isn't guaranteed to qualify this year. The test is annual.
If none of these describe you — if you're retiring right at 65 with no employer coverage bridging the gap — none of this applies. You just enroll in Medicare as planned and move on. (More on that below.)
"But I Barely Take Any Prescriptions"
This is the objection I hear most, and it's the most dangerous misunderstanding in the whole topic.
The penalty has nothing to do with whether you use prescription coverage. It's based entirely on whether you had qualifying coverage available. Your health status today — excellent, no medications, haven't filled a prescription in years — is irrelevant to the calculation.
This is one of those places in retirement planning where "I'll deal with it when I need it" doesn't just delay the cost. It locks one in permanently, regardless of how healthy you turn out to be. The system doesn't care that you didn't need drugs at 67. It cares that you didn't have creditable coverage at 67.
The Two 10-Minute Checks That Prevent a Lifetime Penalty
The good news: this is entirely preventable, and the fix is genuinely simple once you know what to look for. Two checks — ideally completed before you turn 65, or before your employer coverage ever changes, and revisited any time your employer changes carriers or plan designs.
Check 1: The credibility check. Get written confirmation directly from your employer's benefits department or plan administrator that your specific drug coverage qualifies as creditable under Medicare's standards. This document exists — your employer is required to produce the annual notice — but almost nobody asks for it proactively. Don't rely on what a coworker told you two years ago, and don't rely on last year's letter. Get this year's answer, in writing, for your specific plan option.
Check 2: The continuity check. Make sure there is genuinely no gap between your current coverage and the day you enroll in Part D. Medicare's rule gives you 63 days — go 63 or more consecutive days without creditable drug coverage after your initial enrollment period, and the penalty clock starts. Watch the seams especially carefully around job changes, plan switches, and retirement dates that move. A two-month gap you barely noticed becomes a permanent line item on your premium.
If you catch a problem now, here's the part people find reassuring: the penalty only counts the months you actually went without creditable coverage. It doesn't backdate further once you fix the gap. Every month from today forward that you're properly covered stops adding to the number. One call to your benefits department — made before your Medicare enrollment date — can stop the clock.
Who This Doesn't Apply To
A quick honesty check, because not every reader needs to act on this.
If you're retiring right at 65, with no employer health coverage carrying you past that birthday, none of the above applies to you. You enroll in Medicare — Parts A, B, and D — during your initial enrollment period, and you move on. No creditable-coverage test, no penalty clock, no letter from HR to decode.
This post is for the growing number of people whose retirement doesn't work that way: the 66-year-old still leading a team, the 68-year-old consultant on a spouse's plan, the business owner who never set a "retirement date." If your 65th birthday came and went while you were still on employer coverage, the two checks above are worth ten minutes of your time.
Why This Belongs in Your Retirement Plan, Not Just Your HR File
Here's the framing I want to leave you with: healthcare is the wild card in almost every retirement plan I build. Investment returns you can model. Tax brackets you can plan around. But a coverage gap that quietly becomes a permanent, growing surcharge? That's the kind of thing that only shows up if someone is looking at the whole picture — your work timeline, your employer's plan documents, your Medicare enrollment dates — together.
That's what financial planning actually is, at its core. Not picking investments. Diagnosing the small gaps in a complicated, ever-changing system of taxes, healthcare, and investments before they become expensive. The Part D penalty is one gotcha; there are dozens of others hiding in the same filing cabinet.
If you want to talk through how your healthcare costs — Medicare strategy included — fit into your broader retirement income plan, schedule a free strategy call. We'll look at where you stand and whether planning makes sense at this stage of your life.
And if you're comparing Part D options for 2027, start with Medicare's Plan Finder tool to see actual plans and premiums — then bring what you find to the conversation.
The Bottom Line
Starting in 2027, the definition of "good enough" employer drug coverage gets stricter — 73% instead of 60% — and the plans most likely to fail the new test are the high-deductible plans that careful savers tend to choose.
The penalty for being wrong is 1% of your Part D premium for every uncovered month, added permanently, growing as premiums grow.
But the mistake isn't permanent until the clock runs. Confirm your coverage is creditable, in writing, today. Close any gaps. And then get back to the retirement you're actually planning — with one fewer surprise waiting in it.
The bottom line is simple: a penalty you never see coming is still a penalty you pay — every month, for the rest of your life. Ten minutes of checking today is the cheapest retirement decision you'll ever make.
And if you'd rather not sort through Medicare rules, tax brackets, and withdrawal strategies on your own, that's exactly the work I do.
I'm Joe Boughan, CFP® — a fee-only fiduciary financial planner in South Shore of Boston.
At Parkmount Financial Partners, I help pre-retirees and retirees across the South Shore, Greater Boston, Norwell, Cohasset, and Cape Cod build retirement income plans where details like this get caught early — not after they've turned into permanent costs.
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