Medicare Part D

Why 2025 Income Shifts 2027 Medicare Bills in Dearborn

DEARBORN, Mich. — As Medicare's fall Annual Enrollment Period runs through Dec. 7, one detail is tripping up more households than usual: how the income you reported two years ago can quietly raise what you'll pay for Part B and Part D in 2027.

The income question catching Dearborn retirees off guard

The surcharge has a name — the Income-Related Monthly Adjustment Amount, or IRMAA — and for 2026 it kicks in once a single filer's modified adjusted gross income tops $109,000. For married couples filing jointly, the first threshold sits at $218,000. If you're under those numbers, IRMAA doesn't apply to you at all. If you're over, it's worth understanding exactly how it works before you make enrollment decisions.

What IRMAA is, in plain English

Most people pay the standard Part B premium and whatever their Part D plan charges. But if your income is above the thresholds set by Medicare, you pay an extra amount on top — that extra is IRMAA.

A few key points:

• IRMAA is added to both Part B and Part D premiums, separately.
• It's billed by Medicare, not by your drug or Medicare Advantage plan.
• If you have Part D through a Medicare Advantage plan, the Part D portion of IRMAA still applies.
• The surcharge is tiered — the higher your income, the higher the surcharge climbs.

The two-year lookback that surprises people

Here's the part that catches Dearborn readers off guard: Medicare uses your tax return from two years ago to set a given year's surcharge. So your 2027 premiums will be based on the income you reported on your 2025 federal tax return.

That means a one-time bump in income — selling a house, cashing out a retirement account, taking a large Roth conversion, or receiving a severance package in 2025 — can push you into IRMAA territory for 2027 even if your income is much lower now.

The 2026 thresholds to know

For 2026, IRMAA begins at these modified adjusted gross income levels (based on your 2024 tax return):

• Single filers: above $109,000
• Married filing jointly: above $218,000
• Married filing separately: a much lower threshold applies, so check medicare.gov for the current figure.

There are several tiers above those starting points. The exact dollar amount added to your Part B and Part D premiums depends on which tier you fall into. Medicare publishes the full chart on medicare.gov, and the Social Security Administration mails an official determination letter to anyone affected.

If your income has dropped, you can appeal

This is the piece many people miss. If a life-changing event has lowered your income since that 2024 return, you can ask Social Security to recalculate. Qualifying events include:

• Marriage, divorce, or the death of a spouse
• You or your spouse stopped working or cut back hours (retirement counts)
• Loss of pension income
• Loss of income-producing property due to a disaster or other event outside your control

You file Form SSA-44 with documentation. If Social Security agrees, they'll adjust your IRMAA — sometimes eliminating it entirely. Don't just pay a surcharge that no longer reflects your reality.

What else is changing for 2027

While you're looking at the income side, keep the broader 2027 numbers in mind, because they affect how much drug coverage is worth to you:

• Part D out-of-pocket cap: $2,100 in 2026 and $2,400 in 2027. Once your covered drug costs hit that amount, you pay nothing for covered drugs the rest of the year.
• Maximum Part D deductible: $615 for 2026 and $700 for 2027.
• The coverage gap ("donut hole") is gone — replaced in 2025 with a simpler three-phase structure that carries into 2027.
• Medicare Prescription Payment Plan: an optional program that lets you spread your drug costs across monthly payments instead of paying at the pharmacy counter.

Dearborn is in Wayne County, where Medicare beneficiaries can compare 81 Medicare Advantage plans from 16 carriers in 2027, along with stand-alone Part D plans, during AEP. Availability is set at the county level, so your options in Dearborn are the same as elsewhere in Wayne County.

Common mistakes to avoid

• Assuming last year's income means this year's premium. It doesn't — Medicare will look at 2025 for 2027.
• Ignoring the SSA letter. If you get an IRMAA notice, read it. If the income listed is wrong or outdated, you have appeal rights.
• Skipping the Part D review. Even if IRMAA raises your premium, the right drug plan for your medications still matters. Prices, formularies, and pharmacy networks change every year.
• Missing Dec. 7. The Annual Enrollment Period ends that day. After that, most people can only change Medicare Advantage plans (Jan. 1 – March 31, 2027) or wait until next fall.