Medicare Costs and Penalties in Washington — What You'll Actually Pay

How much does Medicare cost per month in Washington?

In 2026, the standard Part B premium is $202.90/month. Part A is usually $0 if you or your spouse paid Medicare taxes for at least 10 years. A standalone Part D drug plan in Washington runs about $20–$60/month. A Medicare Supplement plan in Washington typically runs $230–$350/month depending on age, plan letter, and carrier — see Plan G vs Plan N in Washington for the most popular options compared. Some Medicare Advantage plans in Washington have $0 monthly premiums, but be aware of why Medicare Advantage plans sometimes cost more than you think.

What is the Part B late enrollment penalty?

If you don't enroll in Part B when first eligible — and you don't have qualifying employer coverage — your premium goes up 10% for every 12 months you delayed. The penalty is permanent. It's added to your Part B premium for as long as you have Part B. Find out more about what happens if you miss your Medicare enrollment window.

What is the Part D late enrollment penalty?

If you go 63 days or more without creditable drug coverage after your Initial Enrollment Period, you'll pay a Part D penalty: 1% of the national base beneficiary premium for every month you went without. In 2026 that base is approximately $36.78. The penalty is added to your Part D premium for life.

Are Medicare premiums higher if I have higher income (IRMAA)?

Yes. If your modified adjusted gross income from two years ago is over the threshold (in 2026, around $106,000 for single filers / $212,000 joint), you'll pay an IRMAA surcharge on Part B and Part D premiums. The higher your income, the higher the surcharge — it can more than double your Part B premium at the top brackets.

Late enrollment penalty examples

*Examples assume 2026 standard Part B premium. Actual penalties scale with future premiums and your years on Medicare.

2026 Medicare costs at a glance

These are Medicare's own costs. They don't include long-term care, which Medicare largely doesn't cover and which is far more expensive. For a detailed breakdown of what nursing home, assisted living, and in-home care actually costs in Western Washington, see the LTC costs page.

Washington's hidden advantage for Medicare Supplement costs

Washington uses community rating for Medicare Supplement plans, meaning your premium is based on the plan you choose, not your age. In most states, premiums rise every year as you get older. In Washington, a 75-year-old can pay the same rate as a 65-year-old for the same plan.

Washington is also one of only a handful of states where you can switch Supplement plans any time of year with guaranteed issue — no medical underwriting. Most states lock you in after your initial enrollment window.

This changes the risk calculation for Washington residents significantly. Choosing a plan and later deciding it's not right for you doesn't have to be permanent here.