A retiree collecting the average Social Security benefit opened their January 2026 deposit to find roughly $38 more than the month before. Not $56, which is what the 2.8 percent cost-of-living adjustment promised on paper. The difference: a higher Medicare Part B premium, deducted automatically before the money ever reached their bank account.
That $18 gap between the advertised raise and the actual increase has become a familiar sting for the more than 67 million Americans who depend on Social Security. And for retirees watching grocery receipts, utility bills, and pharmacy co-pays climb, an extra $1.27 a day doesn’t stretch far.
How the COLA and the premium increase interact
The Social Security Administration calculated the 2026 COLA at 2.8 percent by comparing the third-quarter 2025 average of the Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W) against the same quarter a year earlier. The formula, set by Section 215(i)(1) of the Social Security Act, is automatic. The SSA estimated the average monthly benefit for all Social Security recipients at roughly $1,976 before the adjustment, putting the gross increase at about $55 per month starting in January. (Individual results vary based on benefit type and earnings history.)
Meanwhile, the Centers for Medicare and Medicaid Services raised the standard Part B premium to $202.90 per month for 2026, up $17.90 from $185.00 in 2025. The annual deductible rose to $283. CMS attributed the increase to projected shifts in health care utilization and pricing, including higher spending on skin substitutes and other outpatient services.
Because the vast majority of Medicare enrollees have their Part B premiums withheld directly from Social Security, the $17.90 increase is subtracted before the deposit lands. A roughly $55 raise on paper becomes approximately $38 in the checking account, or about $456 over the full year.
Smaller benefits absorb a bigger hit
The flat-dollar structure of the Part B premium increase makes it regressive by design. Consider three retirees at different benefit levels:
- A retiree collecting $1,200 per month receives a gross COLA increase of about $34. After the $17.90 premium hike, the net gain is roughly $16, or 53 cents a day.
- At a benefit near the overall average, the gross increase is about $55, netting approximately $38.
- A retiree collecting $3,000 per month sees a gross increase of about $84, keeping around $66 after the deduction.
The same $17.90 takes 53 percent of the lowest earner’s raise but only 21 percent of the highest earner’s. For the roughly one in four Social Security recipients who collect less than $1,200 a month, the COLA barely registers after Medicare takes its cut.
One safeguard does limit the damage. The “hold-harmless” provision under Section 1839(f) of the Social Security Act prevents a Part B premium increase from pushing a beneficiary’s net Social Security payment below the prior year’s level. In practice, the premium hike cannot exceed the dollar amount of the COLA for most enrollees. In 2026, because the average COLA increase comfortably exceeds the premium increase ($17.90), the provision is not a binding constraint for most retirees. It becomes critical in years when the COLA is very small or zero.
The inflation index doesn’t measure what retirees actually spend
The CPI-W tracks spending patterns of working-age urban wage earners and clerical workers, not retirees. The Bureau of Labor Statistics publishes an experimental Consumer Price Index for the Elderly (CPI-E) that gives greater weight to health care costs, reflecting the spending reality of Americans 62 and older. Historically, the CPI-E has run slightly higher than the CPI-W, suggesting the COLA formula may systematically undercount inflation as retirees experience it.
Legislation to adopt the CPI-E for Social Security COLAs has been introduced in multiple sessions of Congress, but as of mid-2026, no bill with significant bipartisan support has advanced. The mismatch remains a structural issue, not a near-term policy fix.
Higher earners face even steeper deductions
The $202.90 standard premium applies only to individuals with modified adjusted gross income at or below $106,000 (or $212,000 for joint filers). Above those thresholds, the income-related monthly adjustment amount (IRMAA) adds surcharges that push Part B premiums as high as $628.90 per month for the highest earners. For retirees in upper IRMAA brackets, the COLA increase can be entirely consumed or even exceeded by the combined premium.
IRMAA determinations are based on tax returns from two years prior, so 2026 premiums reflect 2024 income. Retirees who experienced a qualifying life-changing event, such as retirement itself, divorce, or the death of a spouse, can file SSA Form SSA-44 to request a recalculation based on more current income.
How to verify your actual net increase for 2026
Averages describe the broad picture, but individual results depend on benefit level, filing history, and Medicare plan choices. The most reliable step is to log into a my Social Security account and review the benefit statement reflecting the January 2026 adjustment. That document shows the exact COLA applied to a specific benefit amount and the precise Part B premium deducted, including any IRMAA surcharge.
Retirees carrying Medicare Part D, Medigap, or Medicare Advantage plans should factor those premiums into their net calculation as well. Part B is the most visible deduction because it comes straight out of the Social Security check, but it is not the only health care cost eating into the raise.
For those finding the net increase insufficient, the SSA’s benefits planner page explains how Part B premiums interact with Social Security payments and links to Medicare Savings Programs. Low-income retirees may qualify for state programs that cover part or all of the Part B premium, effectively restoring the full COLA increase to their monthly income. Given that the premium absorbed nearly a third of the average retiree’s raise this year, checking eligibility is worth the 15 minutes it takes.
