Social Security COLA: How Your Benefits Keep Up with Inflation

In October 2025, the Social Security Administration released a single number that would determine how 75 million Americans' checks changed in January: 2.8% [1].

That's the 2026 Cost-of-Living Adjustment. On an average benefit of $1,927, it works out to about $54 extra per month. Not bad, right? Until you subtract the $17.90 increase in Medicare Part B premiums that gets deducted from the same check. That leaves $36.06 in actual additional spending power.

For a program designed to protect retirees from inflation, the COLA has a quiet problem: it consistently fails to keep up with the things retirees actually spend money on.

30-Second Summary: The Social Security COLA is an annual benefit increase based on the CPI-W (a measure of inflation for urban wage earners, not retirees). The 2026 COLA is 2.8%, but after Medicare premium increases, the average net benefit increase is about $36/month. Since 2010, Social Security benefits have lost roughly 20% of their purchasing power because healthcare and housing costs outpace the CPI-W.

How COLA Is Calculated

The formula is specific and mechanical. No committee decides the number. No politician sets it.

The SSA compares the average Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W) during the third quarter of the current year (July, August, September) to the same quarter of the most recent year in which a COLA was determined [2].

If the CPI-W went up, benefits go up by the same percentage. If it went down or stayed flat, benefits stay the same. They never decrease.

For 2026:

• Q3 2025 CPI-W average vs. Q3 2024 CPI-W average = 2.8% increase [1]
• Applied to benefits payable starting January 2026
• SSI payments adjusted starting December 2025

You don't need to apply. It happens automatically. Your January check (which arrives in February, since Social Security pays one month behind) reflects the new amount.

The 2026 COLA in Real Dollars

Here's what the 2.8% COLA actually means for different benefit levels:

The SSA rounds down to the nearest dime. These increases look reasonable on paper. The problem appears when you subtract what Medicare takes.

The Medicare Premium Squeeze

For the average retiree, here's the real math:

Medicare premiums consumed 33% of the COLA. For lower-income retirees with benefits below average, the percentage is even higher.

There is a safety valve: the Hold Harmless provision prevents your net Social Security check from actually declining due to Part B increases [3]. If the premium hike exceeds your COLA, the premium increase is capped at your COLA amount. But this provision doesn't apply to beneficiaries who pay IRMAA surcharges, new enrollees, or those who don't have premiums deducted from Social Security.

Why COLA Doesn't Feel Like Enough

The CPI-W measures inflation for "urban wage earners and clerical workers." That's a population of working-age people who spend money very differently from retirees.

Retirees spend more on:

• Healthcare (which has risen faster than general inflation for decades)
• Housing (especially property taxes and maintenance)
• Prescription drugs (before the IRA cap, costs were rising 5-10% annually)

Retirees spend less on:

• Gasoline (less commuting)
• Clothing (fewer work wardrobes)
• Technology (which often gets cheaper)

The CPI-W weights all these categories based on how working-age people spend. Healthcare might be 8% of the CPI-W basket but 15% of a retiree's actual budget.

The Bureau of Labor Statistics publishes an experimental index called CPI-E (for the elderly) that weights spending patterns for people 62 and older [4]. The CPI-E has consistently run higher than the CPI-W by about 0.2 to 0.3 percentage points per year. That sounds small, but over 20 years of retirement, it compounds into a significant gap.

The Senior Citizens League found that Social Security benefits lost roughly 20% of their purchasing power between 2010 and 2024 [5]. A grocery basket that cost $100 in 2010 costs roughly $140 today. Social Security benefits haven't kept the same pace, mainly because healthcare costs dragged the average retiree's real spending higher than the CPI-W reflects.

If that frustrates you, good. It should.

A Surprise About COLAs and Delaying Benefits

Here's something that surprises even financial advisors: COLAs are applied to your Primary Insurance Amount starting at age 62, whether or not you've filed for benefits [6].

If you turn 62 in 2026 but plan to delay claiming until 70, every annual COLA between now and then still gets applied to your PIA. When you finally claim at 70, your benefit reflects eight years of COLA increases plus your delayed retirement credits. You don't miss out on inflation adjustments by waiting.

This is a common concern: "If I don't take benefits at 62, I'll miss eight years of COLAs." False. The COLAs compound on your base benefit regardless. Delaying still works.

For more on why delaying can be your most powerful retirement move, see our article on when to claim Social Security.

Historical COLA Context

COLAs have been automatic since 1975. Before that, Congress voted on ad hoc increases. Here are some notable years:

The 10-year average is approximately 2.6% [7]. The 8.7% COLA in 2023 was the largest since 1981, driven by post-pandemic inflation that hit groceries and energy especially hard.

Zero-COLA years are painful. In 2010 and 2011, benefits didn't increase at all, but the costs of living for retirees (groceries, utilities, property taxes) kept rising. Those two flat years did permanent damage to purchasing power that subsequent COLAs never fully recouped.

Is COLA Taxable?

The COLA itself isn't separately taxed. But it increases your gross Social Security benefit, which can push more of your total benefit into the taxable range.

Social Security benefits become taxable when your "combined income" (AGI + nontaxable interest + half your SS benefits) exceeds $25,000 (single) or $32,000 (joint). Up to 85% of benefits can be taxable above $34,000/$44,000 [8].

These thresholds haven't been adjusted for inflation since 1993.

Every COLA increase pushes more retirees above them. In effect, COLA raises can create a stealth tax increase: you get a bigger check, more of it becomes taxable, and your net gain is smaller than the headline number suggests.

For help managing how retirement income sources affect your tax bracket, see our guide on tax-efficient withdrawal strategies.

Your Next Move

1. Check your January notice. The SSA mails a notice in December showing your new 2026 benefit amount, including the COLA increase and any Medicare premium changes. If you didn't receive one, check your my Social Security account at ssa.gov.

2. Don't count on COLA to keep pace. Budget for real-world cost increases that exceed the official number. Healthcare costs, in particular, tend to outpace COLA by 2-4 percentage points in many years.

3. Build your own inflation hedge. Treasury I-Bonds, TIPS, and a high-yield savings account at Marcus or Ally Bank can supplement Social Security's imperfect inflation protection.

4. Watch the tax trap. If you're near the taxation thresholds ($25k/$32k combined income), a COLA increase could push more of your benefits into the taxable range. Run the numbers with our compound interest calculator to project your total retirement income.

5. Stay engaged. Congress periodically considers switching from CPI-W to CPI-E or another measure. Such a change would affect every future COLA. The political fight over Social Security's future is, in part, a fight about how inflation is measured.

References

1. Social Security Administration. (2025). Cost-of-Living Adjustment (COLA) Information for 2026. SSA.gov. https://www.ssa.gov/cola/
2. Congressional Research Service. (2025). Social Security: Cost-of-Living Adjustments (94-803). Congress.gov. https://www.congress.gov/crs-product/94-803
3. Congressional Research Service. (2025). Social Security: The Hold Harmless Provision. Congress.gov. https://www.congress.gov/crs-product/94-803
4. Bureau of Labor Statistics. (2025). Consumer Price Index. BLS.gov. https://www.bls.gov/cpi/
5. The Senior Citizens League. (2024). 2024 Loss of Buying Power Study. SeniorsLeague.org. https://seniorsleague.org/assets/TSCL-LOBP-Report-2024.pdf
6. Hartford Funds. (2025). Social Security COLA and Delayed Benefits. HartfordFunds.com.
7. Social Security Administration / Nasdaq. (2023). Average COLA Over the Last 10 Years. Nasdaq.com. https://www.nasdaq.com/articles/heres-the-average-social-security-benefit-cola-over-the-last-10-years
8. Internal Revenue Service. (2025). Publication 915: Social Security and Equivalent Railroad Retirement Benefits. IRS.gov. https://www.irs.gov/forms-pubs/about-publication-915