2026 is the second year of the most significant Part D redesign in the program's history — and it's saving real money for people on expensive medications.
Here's what Part D actually costs this year, the new $2,100 out-of-pocket cap, and why the cheapest premium is almost never the cheapest plan.
2026 Part D Costs at a Glance
| Cost Component | 2026 Amount |
|---|---|
| Average Monthly Premium | $64.96 (industry estimate) |
| Base Beneficiary Premium | $38.99 (used for IRMAA + late-penalty math) |
| Maximum Annual Deductible | $615 (many plans charge less or $0) |
| Initial Coverage — your share | 25% on covered drugs after deductible |
| Out-of-Pocket Maximum (NEW) | $2,100 — then plan pays 100% |
| Late Enrollment Penalty | 1% of base premium per month delayed, for life |
The $2,100 Cap Changes Everything for Expensive Drugs
Once you spend $2,100 on covered drugs in 2026, your plan covers 100% of those drugs for the rest of the year. No more "donut hole," no more catastrophic-phase coinsurance. This single change is saving people on specialty medications thousands of dollars a year.
You can also opt into the new Medicare Prescription Payment Plan, which spreads your out-of-pocket drug costs evenly across the months remaining in the year — so a $1,200 January copay doesn't have to be paid in January.
The Three Cost Phases in 2026
| Phase | What You Pay | Ends When |
|---|---|---|
| 1. Deductible | 100% of drug costs up to plan's deductible (max $615) | Plan deductible is met |
| 2. Initial Coverage | 25% of covered drugs (plan pays 75%) | You hit $2,100 in OOP costs |
| 3. Catastrophic | $0 for covered drugs | End of plan year |
The IRMAA Surcharge on Part D
If your modified adjusted gross income (MAGI) from two years ago was above the IRMAA thresholds, you'll pay an extra surcharge added to your Part D premium — billed by Medicare, not the plan.
| 2024 MAGI (Individual) | 2024 MAGI (Joint) | Extra Part D / month in 2026 |
|---|---|---|
| ≤ $109,000 | ≤ $218,000 | $0 |
| $109,001 – $137,000 | $218,001 – $274,000 | $14.50 |
| $137,001 – $171,000 | $274,001 – $342,000 | $37.50 |
| $171,001 – $205,000 | $342,001 – $410,000 | $60.40 |
| $205,001 – $499,999 | $410,001 – $749,999 | $83.30 |
| ≥ $500,000 | ≥ $750,000 | $91.00 |
Why Cheapest Premium ≠ Cheapest Plan
Meet Linda — The $9 Premium That Cost $1,400 More
Linda picked the $9.40/month Part D plan because it was the cheapest in her ZIP code. She takes four medications, including a brand-name blood thinner.
Her brand-name drug wasn't on that plan's preferred formulary. She paid $187/month for it instead of the $42 she would've paid on a $32-premium plan that covered it as a Tier 3 drug.
By year's end she'd paid $113 in premiums and $2,244 in extra copays. The plan with the $32 premium would have totaled about $384 + $504 — saving her over $1,400.
What to Check Every October
- Read your Annual Notice of Change (ANOC). It tells you exactly what's changing for next year — premium, deductible, formulary, tiers.
- Re-check every drug. A medication can move tiers, get dropped from the formulary, or get a new prior-authorization requirement.
- Re-check your pharmacy. Preferred-pharmacy networks change. Costco, Walmart, and mail-order tiers shift year to year.
- Compare total annual cost. Premium + deductible + estimated copays — not premium alone.
The late enrollment penalty is permanent
Run a free Part D plan check for 2026.
We'll compare every plan in your ZIP code against your actual medications and pharmacy — and show you the cheapest total annual cost, not just the cheapest premium.
Book a free call