Medicare Part D 2027: Deductible, Out-of-Pocket Cap and Base Premium

Name: Medicare Part D 2027: Deductible, Out-of-Pocket Cap and Base Premium
Creator: QuantCalc
License: https://creativecommons.org/licenses/by/4.0/

The official 2027 Part D figures from CMS beside 2026: the deductible, the out-of-pocket cap, the national base premium and the income surcharge on top.

For 2027, the Medicare Part D standard deductible is $700 (up from $615), the annual out-of-pocket cap is $2,400 (up from $2,100), and the national base beneficiary premium is $41.33 a month (up from $38.99). All three are official CMS figures. Your own premium is set by your plan.

Official Every figure on this page is published by the responsible agency; none is a projection.

Part D figures, 2026 and 2027 — CMS, CY 2027 Rate Announcement (6 April 2026), Part D benefit parameters table; CMS, Medicare Part D 2027 National Average Monthly Bid Amount Information (28 July 2026)
Figure	2026	2027
National base beneficiary premium (monthly)The yardstick for the late-enrollment penalty; not what any plan charges	$38.99	$41.33
National average monthly bid amountEnrollment-weighted average of plan bids; sets the government subsidy	$239.27	$296.05
Standard deductible (maximum a plan may charge)Plans may set a lower deductible, or none	$615	$700
Annual out-of-pocket threshold (cap)After this, you pay $0 for covered drugs for the rest of the year	$2,100	$2,400

Base premium and average bid: CMS, Medicare Part D 2027 National Average Monthly Bid Amount Information (28 July 2026) for 2027, CMS, Annual Release of Part D National Average Bid Amount (28 July 2025) for 2026. Deductible and cap: CMS, CY 2027 Rate Announcement (6 April 2026), Part D benefit parameters table. The cap counts your deductible, copays and coinsurance on covered drugs; it does not count premiums or drugs your plan does not cover. CMS publishes average plan premiums for 2027 with the plan landscape in late September.

Part D IRMAA: the income surcharge

If your modified adjusted gross income from two years earlier is above the first threshold, you pay a monthly Part D surcharge on top of your plan premium. These are the 2026 tiers (from your 2024 return), from QuantCalc’s tax constants, which follow the CMS 2026 notice. The 2027 thresholds are indexed to CPI-U and published in the autumn; our projection is on 2027 IRMAA brackets (projected) →

Part D IRMAA surcharge, 2026 (per person, per month)
Single MAGI	Joint MAGI	Surcharge
$109,000 – $137,000	$218,000 – $274,000	+$14.50
$137,000 – $171,000	$274,000 – $342,000	+$37.50
$171,000 – $205,000	$342,000 – $410,000	+$60.40
$205,000 – $500,000	$410,000 – $750,000	+$83.30
$500,000 or more	$750,000 or more	+$91.00

Your 2027 Part D late-enrollment penalty

Full months without Part D or other creditable drug coverage

Counted from the end of your Initial Enrollment Period. Gaps of fewer than 63 days in a row do not count.

Paid tool Medicare costs are set by income you report two years earlier, so the real decision is which years to take income — a Roth conversion, a large IRA withdrawal, a sale — and how far to go before an IRMAA tier makes the next dollar cost more. The Roth Conversion Planner in Personal PRO works that schedule year by year: the conversion in each year, the federal and state tax it costs, and the IRMAA tier that year’s MAGI sets two years later, beside the same years with no conversions. A planning tool, not advice: the numbers move when your assumptions do. Plan my conversions around IRMAA — Personal PRO ($49) → See what is included →

Your Part D surcharge is set by your income two years earlier. QuantCalc runs your whole retirement — Social Security, withdrawals, taxes, Medicare surcharges — year by year.

Run the free tax-aware simulation →

Common questions

What is the Medicare Part D deductible for 2027?

$700, the maximum a standard Part D plan may charge, up from $615 in 2026 (CMS, CY 2027 Rate Announcement (6 April 2026), Part D benefit parameters table). Many plans charge less, or no deductible.

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

$2,400, up from $2,100 (CMS, CY 2027 Rate Announcement (6 April 2026), Part D benefit parameters table). Once your out-of-pocket spending on covered drugs reaches it, you pay nothing more for covered drugs for the rest of 2027.

What is the Part D base beneficiary premium for 2027?

$41.33 a month, from $38.99 in 2026; the national average monthly bid is $296.05 (CMS, Medicare Part D 2027 National Average Monthly Bid Amount Information (28 July 2026)). It is the yardstick for the late-enrollment penalty, not the premium any plan charges.

Does Part D have an income surcharge?

Yes. Above the IRMAA thresholds you pay a monthly Part D surcharge, from $14.50 to $91.00 per person in 2026. See the projected 2027 IRMAA brackets.

Sources

Every figure on this page is read at build time from one dataset and was checked against the text of the documents above on September 24, 2026. Every figure with its source: JSON. QuantCalc is calculation software, not tax, legal or benefits advice.

Medicare open enrollment 2026 dates → 2027 IRMAA brackets (projected) → 2027 Part B premium → Late-enrollment penalty calculator →

Your Part D surcharge is set by your income two years earlier — see the whole picture in the free planner →