Iran war driving COLA estimates up from 1.7% to 4.2%: Senior Citizens League raised 2027 COLA prediction from 2.8% to 3.9% after April's CPI-W increase, while independent analyst Mary Johnson lifted forecast to 4.2% (was 1.7% just months earlier) — driven by Trump's late February attacks on Iran that led to closure of Strait of Hormuz, stymying 20 million barrels of petroleum per day and causing fuel prices to soar.

4.2% COLA would add $87.41 to average monthly check: Based on April average payout of $2,081.16, the 4.2% increase would be 4th largest raise in 36 years, topped only by 5.8% (2009), 5.9% (2022), and 8.7% (2023) — disabled workers would see $68.66 increase, survivor beneficiaries $68.27.

But Social Security dollar lost 20% purchasing power from 2010 to 2024: CPI-W tracks pricing pressures on working-age individuals under 62, not seniors, so it "doesn't accurately account for the costs that matter most to seniors, such as shelter and medical care services" — Medicare Part B premium jumped 5.9%, 5.9%, and 9.7% in last three years, often offsetting COLA, and "one historically large cost-of-living adjustment isn't going to reverse more than a decade of purchasing power declines."

High-income retirees face progressive surcharges on top of standard Medicare premiums: Income-Related Monthly Adjustment Amount (IRMAA) is based on your 2025 tax return (two-year lookback) — projected 2027 thresholds start at $112,000 for singles/$224,000 for married couples filing jointly, with surcharges ranging from $87.40 Part B + $15.40 Part D (first tier) up to $524.60 Part B + $96.40 Part D (highest tier over $500,000/$750,000).

IRMAA is a "cliff" not a bracket — one dollar over costs thousands: Unlike progressive income tax where only money in a bracket is taxed at that rate, IRMAA defaults your entire surcharge to the higher tier if you cross by even $1 — crossing from first tier to second tier by just $1 in 2025 income means estimated extra $1,233.60 to $7,452 annually per person in 2027 ($2,467.20 to $14,904 for married couples).

Standard premium covers only 25% of Medicare costs — IRMAA shifts more to you: Without IRMAA, government subsidizes 75% of Part B program costs; IRMAA systematically reduces this subsidy based on income tiers, forcing higher earners to cover 35% to 85% of actual program costs — eligibility based on Modified Adjusted Gross Income (MAGI = AGI + tax-exempt interest income like municipal bond interest).

$186 billion in improper payments across 64 programs, up $24 billion from prior year: Government Accountability Office found 15 federal agencies made massive overpayments in fiscal year 2025, with 82% being overpayments (not underpayments) — Medicare responsible for largest share at $57 billion, followed by Medicaid ($37 billion), Earned Income Tax Credit ($21 billion), and SNAP food stamps ($10 billion).

Total overpaid since 2003: $3 trillion, with dramatic pandemic spike: Actual total could be much higher — "dramatic uptick during pandemic years of 2020-2023, when new programs were quickly developed and existing programs were rapidly expanded, leading to significantly greater risk of fraud and improper payments."

GAO made 10 recommendations in 2022 — only 1 acted on by April 2026: These are "just the mistakes that the government caught — usually not outright fraud" — comes as JD Vance fraud task force seeks to pressure states including New York to root out fraud sources or risk losing federal funding.