![\"A](\"https:\/\/www.newsbeep.com\/ie\/wp-content\/uploads\/2026\/07\/shutterstock-516986203-huge-licensed-scaled.jpg\")
\t<\/p>\n\t\t<\/p>\n
\u00a9 Thomas Andreas \/ Shutterstock.com<\/p>\n
Margaret retired from a hospital nursing career at 66 with a defined-benefit pension of about $55,000, a 403(b) and IRA worth roughly $780,000, a taxable brokerage account, and a Social Security benefit near $30,000. She timed her Part B enrollment perfectly, chose Original Medicare with a Plan G supplement<\/a>, and never missed a deadline. This spring, her Social Security statement showed a new deduction line she had never seen before. Her Part B premium had jumped from the standard rate to something much larger, and her Part D plan<\/a> tacked on its own surcharge. She had crossed an IRMAA threshold<\/a> two years earlier without knowing it.<\/p>\n Only about 8% of Medicare Part B enrollees pay any IRMAA surcharge. But Margaret\u2019s situation is common among single retirees with a mid-career pension plus a healthy 403(b).<\/p>\n How the Tier 2 Cliff Works<\/p>\n IRMAA uses a two-year income lookback. The premium Margaret pays in 2026 keys off her 2024 tax return: adjusted gross income from Form 1040 line 11, plus tax-exempt interest from line 2a. Municipal bond income that felt tax-free still counts. The brackets are cliffs. One dollar over a threshold moves a beneficiary into the next tier for the entire year.<\/p>\n For a single filer in 2026, the tiers look like this:<\/p>\n 2024 MAGI (single) $109,000 or less $109,001 to $137,000 $137,001 to $171,000 (Tier 2) $171,001 to $205,000 Margaret\u2019s 2024 tax return showed her $55,000 pension, the taxable portion of her Social Security (roughly 85% of the benefit), and a $60,000 IRA withdrawal she took to renovate her kitchen and pay off her car. Add it up and her MAGI cleared $137,000 by a few thousand dollars. That single step into Tier 2 replaced her standard $202.90 Part B premium with $405.80 per month, and layered a Part D IRMAA surcharge on top of her drug plan premium. On an annual basis, the Part B piece alone runs into the low four figures. Had she stayed under $137,000, she would have paid the lower Tier 1 surcharge of $81.20 per month instead.<\/p>\n Married couples get roughly double the single-filer brackets. When one spouse dies, the survivor files single the following year, and the same household income can trigger IRMAA or jump a tier without anything else changing. Margaret is already single, so she lives inside those tighter brackets every year. A pension that would sit comfortably under the joint threshold pushes a single filer close to Tier 1 before any IRA withdrawal is added.<\/p>\n What Margaret Can Do Now<\/p>\n The 2024 return is closed. The 2025 return determines her 2027 premium, and 2026 income determines 2028. Both are still in play.<\/p>\n Manage Withdrawals to the Cliff. Model this year\u2019s projected MAGI against the $137,000 Tier 2 line and the $109,000 Tier 1 line. A large one-time purchase funded with a taxable IRA draw can cost more in IRMAA surcharges over the next two years than the interest on a short bridge loan. If projected MAGI sits within about $20,000 of the next tier, a fee-only advisor who models Medicare surcharges alongside tax brackets can price whether a partial Roth conversion in a lower-income year saves money against the two-year IRMAA hit it creates. Margaret should consider drawing from the taxable brokerage first and keeping the 403(b) spigot barely cracked until the pension-plus-Social-Security math is back under the Tier 1 line.<\/p>\n
\nPart B surcharge (monthly)
\nTotal Part B premium<\/p>\n
\n$0.00
\n$202.90<\/p>\n
\n$81.20
\n$284.10<\/p>\n
\n$202.90
\n$405.80<\/p>\n
\n$324.60
\n$527.50<\/p>\n
\nPlan for QCDs Once RMDs Begin. Required minimum distributions<\/a> start at age 73 for Margaret. Qualified charitable distributions<\/a> from an IRA (available at 70\u00bd) satisfy RMDs without adding to MAGI, so a charitably inclined retiree can shave IRMAA exposure at the same time.<\/p>\n