Every January, millions of retirees in the United States review their updated Social Security payments, expecting that the annual cost-of-living adjustment will help offset rising expenses. In 2026, the Social Security Administration applied a 2.8% cost-of-living adjustment (COLA), reflecting changes in the consumer price index.
For many retirees, this adjustment raised the average monthly Social Security benefit from about $2,015 to roughly $2,071. That translates to an increase of around $56 per month. On paper, the increase appears helpful. However, for many beneficiaries, other deductions and rising costs have significantly reduced the actual benefit they receive.
Two major factors explain this outcome: higher Medicare premiums and income-related surcharges known as IRMAA.
COLA
The Social Security cost-of-living adjustment is designed to help retirees maintain purchasing power as prices rise. The adjustment is calculated annually using inflation data, specifically the Consumer Price Index for Urban Wage Earners and Clerical Workers.
In 2026, the 2.8% adjustment resulted in a modest increase in monthly payments.
| Year | Average Monthly Benefit | Increase |
|---|---|---|
| 2025 | $2,015 | – |
| 2026 | $2,071 | +$56 |
While the increase appears straightforward, the net benefit received by retirees often depends on other deductions applied to their Social Security payment.
Medicare
One of the most immediate reductions to the COLA increase comes from Medicare Part B premiums.
In 2026, the standard Medicare Part B premium rose to $202.90 per month. This represents an increase of $17.90 compared with the previous year.
Because most retirees have their Medicare premiums automatically deducted from their Social Security payments, the higher premium reduces the COLA increase.
For example:
| Item | Monthly Amount |
|---|---|
| Average COLA increase | $56 |
| Medicare Part B increase | -$17.90 |
| Remaining increase | About $38 |
After the premium adjustment, many retirees effectively see only about $38 more per month in their Social Security payment.
In addition, the Medicare Part B annual deductible increased to $283, adding further pressure to health care budgets.
IRMAA
For higher-income retirees, another factor can reduce the benefit increase even further. This is known as IRMAA, or the Income-Related Monthly Adjustment Amount.
IRMAA is an additional charge applied to Medicare Part B and Part D premiums for beneficiaries whose income exceeds certain thresholds.
In 2026, the approximate monthly Medicare Part B premiums by income level are as follows:
| Income Level | Monthly Premium |
|---|---|
| Up to $109,000 | $202.90 |
| $109,001 – $136,000 | $284.10 |
| $136,001 – $163,000 | $394.90 |
| $163,001 – $500,000 | $505.70 |
| Over $500,000 | $689.90 |
For someone in the second IRMAA bracket, the monthly premium increases to $284.10. That is nearly $100 more than the standard premium.
When this higher premium is deducted from a Social Security payment, it can eliminate most or even all of the annual COLA increase.
Income
A detail that surprises many retirees is how IRMAA is calculated. The surcharge is based on income reported two years earlier.
This means that Medicare premiums charged in 2026 are determined using income reported on 2024 tax returns.
As a result, retirees may face higher Medicare costs even if their current income has already decreased.
Several common financial events can trigger higher reported income in a given year, including:
- Roth IRA conversions
- Property sales
- Large withdrawals from retirement accounts
- Required minimum distributions (RMDs)
Even if these transactions occurred only once, they can temporarily place a retiree into a higher IRMAA bracket.
Inflation
Inflation also affects how much the COLA increase actually improves purchasing power.
The Federal Reserve closely monitors the Personal Consumption Expenditures index, commonly known as the PCE indicator. In recent data, core PCE inflation has been around 3.0% annually.
Because this inflation rate slightly exceeds the 2.8% Social Security increase, retirees may find that their purchasing power has not improved significantly.
Health care costs present an additional challenge. Medical services and prescription drugs tend to rise in price faster than general inflation, and retirees typically spend a larger share of their income on these services.
Impact
When these factors are combined, the effect becomes clear. The COLA increase may appear meaningful at first glance, but deductions and rising costs reduce its impact.
A simplified example shows how this works:
| Factor | Monthly Impact |
|---|---|
| Social Security COLA increase | +$56 |
| Medicare Part B premium increase | -$17.90 |
| Possible IRMAA surcharge | Up to -$81 or more |
| Net change for some retirees | Minimal or negative |
For retirees subject to IRMAA, the higher Medicare premium alone can offset the entire Social Security increase.
The result is that many beneficiaries may not experience the financial relief they expected from the annual adjustment. While COLA is designed to protect retirees from inflation, other costs tied to health care and income thresholds can significantly reduce its real-world impact.
FAQs
What is IRMAA in Medicare?
IRMAA is an extra Medicare premium for higher-income retirees.
How much was the 2026 Social Security COLA?
The COLA increase for 2026 was 2.8%.
Why did Medicare reduce the COLA increase?
Higher Part B premiums are deducted from Social Security.
What income determines IRMAA in 2026?
IRMAA in 2026 is based on income reported in 2024.
