Part D 2027: A $0-Deductible Plan Costing $30 More a Month Wins Only if Your Drugs Cost $480 to $8,160 a Year

medicare part-d prescription-drugs retirement-planning open-enrollment

Medicare open enrollment runs from October 15 to December 7, and for drug plans the 2027 numbers are already set. CMS’s CY 2027 Rate Announcement (April 6, 2026) raises the standard deductible to $700 and the out-of-pocket cap to $2,400. Many plans skip the deductible in exchange for a higher premium. Whether that’s worth it is a clean piece of math.

We used the Part D 2027 calculator to compare two example plans under the standard 25% share: Plan A with the full $700 deductible at $40 a month, and Plan B with no deductible at $70 a month.

The $0-deductible plan wins in the middle

Paying no deductible saves 75% of $700, $525, as long as you’d have spent through it, because after the deductible you’d pay 25% anyway. The extra premium is $360 a year. So Plan B is $165 ahead when your drugs cost enough to use the whole deductible and not so much that both plans hit the cap:

Drug cost per month Plan A ($700 deductible, $40/mo) Plan B ($0 deductible, $70/mo) Cheaper
$0 $480 $840 A by $360
$50 $1,080 $990 B by $90
$100 $1,305 $1,140 B by $165
$400 $2,205 $2,040 B by $165
$625 $2,880 $2,715 B by $165
$800 $2,880 $3,240 A by $360
$1,500 $2,880 $3,240 A by $360

The crossovers are at about $40 a month ($480 a year, where B’s 25% plus premium equals A’s full price plus premium) and $680 a month ($8,160 a year, where B’s share plus premium reaches A’s $2,400 plus premium). Above that, both pay $2,400 for drugs and the cheaper premium wins.

The general rule: compare the extra premium with 75% of the deductible you’d skip, and only if you’ll neither stay under the deductible nor reach the cap.

The payment plan: great for big early costs, not for small even ones

The Medicare Prescription Payment Plan lets you pay your drug costs in monthly installments instead of at the pharmacy, with no interest. The billing rule (42 CFR 423.137) divides what you owe by the months left in the year, so it flattens front-loaded costs and back-loads even ones. Joining in January under Plan A:

Drug cost per month January at the pharmacy January bill with the plan Highest monthly bill December bill
$250 $250 $200 $225 $225
$400 $400 $200 $341 $341
$1,000 $775 $200 $261 $261
$3,000 $1,275 $200 $203 $203

For someone filling a $3,000-a-month specialty drug, the plan turns a $1,275 January, $750 February and $375 March into roughly $200 every month. For someone at $400 a month, it shaves January but leaves a $341 bill in December for drugs bought months earlier. The yearly total is the same either way.

Where this doesn’t apply

  • Copays instead of 25%. Most plans use tiered copays. The comparison still works if you estimate your yearly share in each plan from Plan Finder.
  • Different formularies. A cheaper plan that doesn’t cover your drug, or puts it on a high tier, isn’t cheaper.
  • Extra Help. With the Low-Income Subsidy you have no deductible and small copays, so the deductible trade-off disappears.
  • IRMAA. Higher-income enrollees pay a Part D surcharge on top of the premium; it’s the same for both plans and doesn’t change the comparison. The IRMAA cliff explains when it applies.
  • Joining mid-year. The payment plan divides by the months left, so joining later means larger bills.

What to actually do

  1. In Medicare Plan Finder, enter every drug and pharmacy, then sort by estimated yearly cost, not premium.
  2. For two finalists, put the premium, deductible and your monthly drug cost into the calculator.
  3. If your drugs cost less than about $40 or more than about $680 a month, the lower premium usually wins; in between, check the deductible trade-off.
  4. If you’ll reach the cap in the first few months, ask your plan to enroll you in the Prescription Payment Plan before January.
  5. Budget the year’s drugs and premiums together; how your own costs are rising is easier to see with personal inflation.

Compare your two Part D plans →

Quick answers

What is the Medicare Part D out-of-pocket maximum for 2027?

$2,400, up from $2,100 in 2026, per CMS's CY 2027 Rate Announcement (April 6, 2026). The maximum standard deductible rises from $615 to $700. Once your share of covered drug costs reaches $2,400, covered Part D drugs cost $0 for the rest of the year. Premiums don't count toward it.

Is a $0-deductible Part D plan worth a higher premium?

Only in a middle range of drug costs. Skipping a $700 deductible saves you 75% of it ($525) under the standard 25% share, so a plan charging $30 a month more ($360 a year) comes out $165 ahead if your drugs cost between about $480 and $8,160 a year. Below that you don't use enough of the deductible; above it both plans hit the $2,400 cap and only the premium differs.

Should I join the Medicare Prescription Payment Plan?

If your costs are front-loaded or high enough to reach the cap early, yes: at $3,000 a month of drugs it turns a $1,275 January into $200 and no month above $203, with no interest. For low, steady costs it bills less early and more late; at $400 a month the December bill is $341 against $100 at the pharmacy.

How much do my drugs have to cost to reach the 2027 cap?

Under the standard benefit, $7,500 in the year: the $700 deductible plus $6,800 at 25% ($1,700). That's $625 a month spread evenly.

Want to try it yourself?
Open the interactive simulator and run the numbers yourself.
Open tool →
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