How much is the Part D penalty?

Part D Late Enrollment Penalty

How much is the Part D penalty?

The cost of the late enrollment penalty depends on how long you went without Part D or creditable prescription drug coverage.

Medicare calculates the penalty by multiplying 1% of the "national base beneficiary premium" ($34.70 in 2025) times the number of full, uncovered months you didn't have Part D or creditable coverage. The monthly premium is rounded to the nearest $.10 and added to your monthly Part D premium.

The national base beneficiary premium may change each year, so your penalty amount may also change each year.