With the Social Security Administration’s 2027 cost-of-living adjustment announcement just weeks away, retirees are entering the last stretch of 2026 with a raise that has already been outrun by the forces working against it.

The 2.8% COLA that took effect in January lifted the average retired worker’s monthly benefit from roughly $2,015 to $2,071 in the SSA’s initial estimate.

The actual average has since climbed further. As of July 2026, the average retired-worker benefit stood at $2,085.98, according to the SSA’s Monthly Statistical Snapshot.

Medicare premiums surged past the raise, inflation caught up by spring, and the tax code and a decade of eroded purchasing power are still working against the check.

For the 44% of retirees who depend on Social Security for their entire income, according to the Senior Citizens League, the headline amount is only part of the story. What survives deductions and rising costs determines whether the check actually covers the bills.

Medicare’s 9.7% premium hike consumed nearly a third of the raise

The standard Part B premium rose to $202.90 a month in 2026, a $17.90 increase from $185, the Centers for Medicare and Medicaid Services announced. 

Even against the higher July average of $2,085.98, the Part B premium still represents 9.7% of the monthly check.

The jump ranks as the second-highest Part B premium increase in program history, trailing only the $21.60 rise in 2022, independent Social Security analyst Mary Johnson told Yahoo Finance.

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Part B premiums are deducted directly from Social Security checks before each deposit arrives. That means $17.90 of the average $56 raise, roughly 32%, vanished before it reached a single bank account.

The Part B annual deductible also climbed $26, from $257 to $283, adding another layer of out-of-pocket cost before coverage begins. 

As a share of the average annual Social Security benefit, Part B premiums reached an all-time high of 9.4% in 2026, the Boston College Center for Retirement Research reported.

Purchasing power erosion sits behind 2026 Social Security raise

The 2026 adjustment arrived against a longer backdrop of declining real value. Benefits have shed 13.7% of their purchasing power since 2016, the Senior Citizens League concluded in its 2026 Loss of Buying Power study.

The problem is structural. The Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W), which sets the annual adjustment, tracks working-age spending, the Bureau of Labor Statistics confirmed. 

Retirees spend disproportionately on healthcare, a category that consistently outpaces broad inflation. An alternative index, the CPI-E, designed to reflect elderly spending patterns, has been proposed for years but never adopted.

The tax code compounds the problem, dragging more retirees into taxable-benefit territory with every cost-of-living raise.

The provisional income thresholds, $25,000 for single filers and $32,000 for joint filers, have not changed since 1984, according to the SSA.

Above those levels, up to 50% of benefits become taxable; above $34,000 for single filers and $44,000 for joint filers, up to 85% do.

Because the thresholds never move but benefits do, each COLA pushes more retirees into taxable-benefit territory, enlarging tax bills as it lifts checks.

“Our research shows that the average senior gets by on less than $2,000 a month,” Shannon Benton, the Senior Citizens League’s executive director, noted in a statement to 401(k) Specialist.

Social Security’s 2026 raise may look helpful, but years of inflation and unchanged tax thresholds continue eroding retirees’ purchasing power.Maskot / Getty Images Inflation has outrun the 2.8% adjustment since spring 2026

The 2.8% raise was calculated using third-quarter 2025 price data, but inflation has since exceeded that level. The CPI-W rose 3.4% year over year in July 2026, the Bureau of Labor Statistics reported. 

Retirees have been absorbing price increases faster than their benefits grew since March, when annual inflation reached 3.3%.

Among categories that weigh heaviest on older households, the mismatch is starker. Outpatient hospital care costs climbed 5.8% year over year through July, the Bureau of Labor Statistics reported.

Douglas Ornstein, a TIAA Wealth Management director, warned in comments to Forbes Advisor that small annual gaps between benefit increases and actual costs compound fast.

“Some critical costs, healthcare in particular, have risen faster than 2.8% over the past year, which means the purchasing power of that benefit continues to erode over time,” Ornstein said.

For retirees on fixed incomes, even modest gaps between their cost of living and their benefit adjustments can compound meaningfully over a long retirement.

The lag is built into the formula itself, since every cost-of-living adjustment reflects the previous year’s prices.

2027 Social Security COLA projection points to familiar tradeoff

The Senior Citizens League now projects a 3.6% cost-of-living adjustment for 2027, which would add roughly $75 a month to the average check.

Johnson estimates 3.4%, AARP forecasts 3.5%, and the Social Security Administration will announce the official figure on Oct. 14, 2026.

A larger raise would provide some relief, but Medicare costs are projected to climb again. The 2026 Medicare Trustees Report projects the standard Part B premium at $209.50 for 2027, a 3.25% increase. 

Private forecasters estimate the actual 2027 premium at $216 to $219, citing a pattern of Trustees underestimating final costs in recent years, 24/7 Wall St reported.

If the premium lands at the higher end of that range, the gap between the raise and the deduction narrows considerably.

Where the 2027 COLA leaves retirees before it arrives

The October 14 announcement will confirm whether the 2027 raise clears the projected Part B premium, a spread as narrow as $6 a month if forecasters are right. 

Each COLA continues to lift more retirees across the 1984-era taxation thresholds, expanding tax bills even as it lifts checks. 

Medicare Open Enrollment runs from Oct. 15 to Dec. 7, 2026, the annual window when 2027 premiums become available for Medicare Advantage and Original Medicare plans. 

In households for which Social Security is the sole income source, the gap between benefit adjustments and healthcare inflation can be significant. That gap may determine whether supplemental income becomes necessary.

Related: 2027 Social Security COLA: These 3 Months Will Decide Your Raise

This story was originally published by TheStreet on Aug 31, 2026, where it first appeared in the Retirement section. Add TheStreet as a Preferred Source by clicking here.