The 2027 Social Security cost-of-living adjustment is shaping up to be a repeat of this year’s — and that’s not good news. On April 10, 2026, the Senior Citizens League (TSCL) released its latest COLA projection, estimating a 2.8% increase for 2027 — identical to the 2026 adjustment. For the average retired worker, that translates to roughly $56.69 more per month, pushing the average benefit from $2,024.77 to $2,081.46. On paper, that sounds like progress. In practice, it barely moves the needle.
The Medicare Part B Problem
Here’s where the math gets brutal. Effective January 1, 2026, the Centers for Medicare & Medicaid Services raised the standard Medicare Part B premium from $185.00 to $202.90 per month — a 9.7% jump, or $17.90 more per month, automatically deducted from Social Security payments. That single increase consumed nearly a third of the 2026 COLA before most retirees saw a dime of it.
Run the numbers. A retiree with a $2,000 monthly benefit gained $56 from the 2026 COLA but lost $17.90 to the Part B premium hike — leaving a net gain of just $38.10 per month. According to NCPSSM’s analysis, the effective COLA, after Medicare, was closer to 1.9%, not 2.8%. For beneficiaries at the lower end of the income scale — those receiving $640 or less per month — the “hold harmless” provision prevents Social Security checks from shrinking, but that’s a floor, not a raise.
This is the third consecutive year the Part B premium has outpaced the COLA. The 2026 premium increase of 9.7% was more than three times the 2.8% COLA. In 2025, the premium rose 5.8% against a 2.5% COLA. In 2024, premiums climbed 6% against a 3.2% COLA. It’s a pattern, not an anomaly.
“Medicare Part B premiums consistently overtaking Social Security COLAs degrades American seniors’ quality of life over time. Our members constantly tell us that they feel like their benefits aren’t keeping up, and this is a great example of that experience in action.”
— Shannon Benton, Executive Director, Senior Citizens League
A COLA Measured by the Wrong Yardstick
The COLA is calculated using the Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W) — a measure built around working-age households, not retirees. Seniors spend a disproportionate share of their income on healthcare and housing, two categories that have consistently inflated faster than the CPI-W. An alternative index, the CPI-E (Consumer Price Index for the Elderly), weights these categories more accurately and would have produced a higher COLA in seven of the last 10 years. TSCL estimates that a retiree who left the workforce in 1999 would have received roughly $5,000 more in lifetime benefits under the CPI-E formula.
“With every COLA increase, senior citizens fall just a little bit further behind. Seniors spend money on different things in different amounts than the general population, and the continued use of the CPI-W keeps the trend moving in the wrong direction.”
— Drew Powers, Founder, Powers Financial Group
TSCL research shows Social Security’s purchasing power has already eroded by 20% since 2010. To restore what’s been lost, the average retiree benefit would need to increase by $370 per month — roughly $4,440 per year — above and beyond any future COLAs.
How Far Off the 2027 Estimate Could Be
The April projection is an early read, not a locked number. Independent analyst Mary Johnson puts the 2027 COLA at 3.2%, higher than TSCL’s current estimate. TSCL’s own COLA Watch page has floated a figure as high as 4.0% if energy-driven inflation accelerates. Corey Briggs, Director of Wealth Planning at Plaza Advisory Group/Steward Partners, flags potential upward pressure from tariffs and federal tax cuts. Martha Shedden of the National Association of Registered Social Security Analysts expects inflation to land somewhere between 2.4% and 3%, with the COLA likely coming in closer to the low end of that range.
The SSA calculates the official COLA using average CPI-W data from July, August, and September 2026, compared to the same three months in 2025. The official announcement is expected in mid-October 2026, with any adjustment taking effect in January 2027.
What Retirees Should Watch For
Between now and October, monthly CPI-W releases are worth tracking — each reading will shift COLA estimates in real time. Retirees subject to IRMAA surcharges — individuals earning over $109,000 annually — already face Part B premiums ranging from $284.10 to $689.90 per month in 2026, meaning any COLA gain is further compressed for this group. The Medicare Part B annual deductible also rose to $283 in 2026, up $26 from 2025.
For retirees who rely entirely on Social Security, the bottom line is straightforward: a 2.8% COLA, minus a 9.7% Part B premium increase, does not preserve purchasing power. The official 2027 number drops in October — that’s the figure to plan around.
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