The Average 67-Year-Old’s Income Looks Safe Until It Crosses the IRMAA Line

The median full-time American worker earned $1,235 a week in the first quarter of 2026, an annual run rate near $64,000. Per capita disposable personal income was about $68,359 in the same quarter. Against the first 2026 IRMAA threshold of $109,000 for single filers and $218,000 for joint filers, most retirees look comfortably clear of any Medicare surcharge. CMS estimates that income-related Part B adjustments affect roughly 8% of people with Medicare Part B, which sounds like a narrow slice until you start counting the events that can push an otherwise ordinary income year well above the line.

The real danger is the trip wire. A household can sit safely below the threshold in a normal year, then cross it because of one unusual income event: a Roth conversion, a home sale, a severance payment, or a large IRA withdrawal. The Medicare surcharge typically lands two years later, well after the tax year that triggered it is already closed.

The Two-Year Lookback Most Retirees Forget

Medicare generally uses modified adjusted gross income from your tax return two years prior. The Social Security Administration makes the IRMAA determination using IRS data, which means your 2024 return drives your 2026 premium, your 2025 return drives 2027, and your 2026 return drives 2028. By the time the surcharge appears as a deduction from a Social Security check, the income event behind it is old news.

MAGI for IRMAA equals your AGI from Form 1040 line 11 plus tax-exempt interest from line 2a. That add-back catches people who assume their municipal bond income is invisible to Medicare. Tax-exempt interest counts toward the threshold exactly the same way a wage does.

What Crossing the First Line Actually Costs

For a 2026 single filer with MAGI between $109,000 and $137,000, the Part B premium jumps from the standard $202.90 to $284.10, a surcharge of $81.20 a month. Part D adds another $14.50 a month on top of whatever the drug plan charges. Combined, that is $95.70 a month, or $1,148.40 a year, per person. A married couple where both spouses are enrolled pays roughly $2,297 a year at the first tier.

That arithmetic operates as a cliff, not a phase-in. Cross the $109,000 threshold by a single dollar and the full surcharge for both Parts B and D applies immediately, with no gradual ramp. That is real money measured against an average household budget: average annual expenditures for all consumer units were $78,535 in 2024, and the 2026 Social Security COLA was 2.8%. A first-tier IRMAA hit can erase a meaningful slice of that annual benefit increase, especially for a couple paying the surcharge twice.

The brackets escalate quickly from there. At $500,000 single or $750,000 joint, the Part B premium climbs to $689.90 a month, with Part D adding $91.00.

The Events That Push Average Households Over

A 67-year-old living on Social Security and modest withdrawals rarely approaches the line. The crossings typically come from income events that are taxable, controllable, or simply badly timed:

• A Roth conversion done in a year that already includes a full year of wages or self-employment income.
• The sale of a long-held home where the taxable gain remains large after the $250,000 single or $500,000 joint home-sale exclusion.
• A first Required Minimum Distribution, which now starts at age 73 (or 75 for those born in 1960 or later), stacked on top of pension and Social Security income.
• A severance package or deferred compensation payout in the year of retirement.

The Survivor Trap

The most consequential version of this problem surfaces when a spouse dies. A surviving spouse may still file jointly for the year of death, but will eventually file as single, and the single IRMAA thresholds are roughly half the joint ones. Income often falls after a death, but not always by half, so the bracket can shift faster than the household budget does.

What SSA-44 Will and Will Not Fix

Form SSA-44 lets the Social Security Administration consider a lower IRMAA amount when a qualifying life-changing event has reduced income. The qualifying events include marriage, divorce or annulment, death of a spouse, work stoppage, work reduction, loss of income-producing property, loss of pension income, and certain employer settlement payments. The form cannot reverse a voluntary income event. A Roth conversion or voluntary home sale that raised MAGI is generally not appealable through SSA-44, no matter how large the resulting surcharge.

One planning nuance carries real weight here: the One Big Beautiful Bill Act created a new $6,000 “senior bonus” deduction for taxpayers age 65 and older, available for tax years 2025 through 2028. The deduction is a below-the-line item, appearing on Form 1040 after the AGI line, which means it does not reduce AGI and cannot reduce MAGI for IRMAA purposes. Households close to the threshold should not treat this deduction as a buffer. There is an additional wrinkle: the deduction begins phasing out for single filers with MAGI above $75,000 and for couples above $150,000. A retiree whose income is already near the $109,000 IRMAA threshold is likely well into that phase-out range, meaning the senior deduction may already be partially or fully unavailable.

What To Do Before the Lookback Closes

• If you are planning a Roth conversion, optional IRA withdrawal, or property sale, model the 2026 MAGI before December 31 and compare it against the current IRMAA thresholds. Splitting controllable income across two tax years can sometimes keep both years under the first tier, but required distributions must still be taken on schedule.
• If a qualifying life-changing event has cut your income, file SSA-44 promptly with documentation such as proof of work stoppage, a death certificate, or a divorce decree. Do not wait for the two-year lookback to catch up on its own if your current income is already lower.
• If your household income sits within $20,000 of an IRMAA bracket and you control the timing of withdrawals, a fee-only advisor who runs tax-aware retirement income models may be worth consulting before the December cutoff. The goal is to price the tax savings and the Medicare surcharge within the same calculation.

The Surcharge Is Avoidable Only Before the Year Ends

IRMAA is not aimed at average retirees, but average retirees can still trigger it in an unusual income year. Legislation introduced in July 2026 (H.R. 9709, the Medicare Premiums Reduction Act of 2026) would eliminate the surcharge for the first two tiers of filers, covering single filers between $109,000 and $171,000 and couples between $218,000 and $342,000. Rep. Tom Kean (NJ-07), who introduced the bill, estimates it could save affected individuals up to $241 a month. That proposal has been referred to the House committees on Energy and Commerce and Ways and Means, but it has not been enacted, and the current rules remain in force. The key is timing. Before a conversion, sale, severance payout, or large withdrawal closes the tax year, run the MAGI number and price the Medicare bill that may arrive two years later.

Editor’s note: This revision added the phase-out range for the One Big Beautiful Bill Act senior bonus deduction ($75,000 single / $150,000 joint MAGI), clarified the deduction as below-the-line and therefore unable to reduce MAGI for IRMAA calculations, added the bill number H.R. 9709 for the Medicare Premiums Reduction Act of 2026, and included the legislation’s potential monthly savings figure of $241 for individual filers per Rep. Kean’s press release.

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