2027 Social Security COLA: Latest Estimate & Impact
2027 Social Security COLA: The Latest Estimate and What It Means for Your Check
The official 2027 cost-of-living adjustment won't be announced until mid-October, but independent trackers have been updating their projections all summer as new inflation data comes in. Here's where the estimate stands now, and what it would mean in real dollars.
As of the August 2026 estimate from The Senior Citizens League, the 2027 Social Security cost-of-living adjustment is projected at 3.6%, with AARP's independent estimate close behind at 3.5% — both down from earlier-2026 projections that had run closer to 3.8%–3.9%. Neither figure is official. The Social Security Administration calculates the real number from third-quarter (July–September) CPI-W inflation data and announces it in mid-October 2026. If 3.6% holds, the average retired-worker benefit (roughly $2,084 in 2026) would rise by about $75 a month — though a chunk of that gets absorbed if Medicare Part B premiums, currently $202.90 a month, rise again for 2027 as they have in most recent years.
Every year follows roughly the same pattern: nonprofit advocacy groups and financial firms start publishing COLA estimates in the spring based on partial-year inflation data, those estimates shift as new monthly CPI reports come in, and the actual number doesn't exist until the Social Security Administration's official announcement in mid-October. 2026 has followed that pattern closely — and the estimate has been trending down since midyear, not up.
1. The Latest Estimate, and Why It Keeps Moving
The Senior Citizens League (TSCL), a nonpartisan advocacy group that has tracked COLA estimates for decades, projected a 2027 COLA of 3.6% based on data through July 2026, released in its August 12, 2026 estimate. That's down from a projection closer to 3.8%–3.9% earlier in the year, as inflation data came in cooler than initially expected over the summer. AARP's independent projection around the same time landed close by, at approximately 3.5%.
Both are estimates, not commitments, and both will almost certainly move again before October. The COLA is set entirely by actual, finalized Consumer Price Index data for July, August, and September — months that, as of early September 2026, aren't fully reported yet. Anyone budgeting around a specific COLA number this early should treat it as a planning range, not a locked figure.
2. How the COLA Is Actually Calculated
The Social Security COLA formula is set by statute and hasn't changed in decades: it's based on the percentage increase in the average Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W) for the third quarter of the current year, compared to the average CPI-W for the third quarter of the last year a COLA was determined. If there's no increase, there's no COLA — a scenario that has occurred a handful of times in the program's history, most recently in 2010, 2011, and 2016.
The use of CPI-W specifically, rather than CPI-E (an experimental index designed to better reflect elderly consumers' spending) or the broader CPI-U, is a long-running point of criticism from advocacy groups, discussed further below.
3. Recent COLA History
| Year | COLA | Context |
|---|---|---|
| 2023 | 8.7% | Reflected the 2022 inflation surge, largest COLA since 1981 |
| 2024 | 3.2% | Inflation cooling from its 2022 peak |
| 2025 | 2.5% | Continued cooling, near pre-pandemic norms |
| 2026 | 2.8% | Confirmed, effective checks paid starting January 2026 |
| 2027 | ~3.5%–3.6% (estimate) | Official figure due mid-October 2026 |
4. The Medicare Part B Offset
For the roughly 70% of Medicare beneficiaries who have their Part B premium deducted directly from their Social Security check, a rising COLA doesn't translate one-for-one into a rising check. The standard Medicare Part B premium for 2026 is $202.90 a month, and it has increased in most recent years — meaning part of any 2027 COLA increase is likely to be absorbed by a higher Part B premium before the beneficiary ever sees it.
5. The Buying-Power Debate
Even when the COLA outpaces headline inflation in a given year, advocacy groups argue the underlying formula still leaves retirees behind over time. The Senior Citizens League's annual buying-power study has estimated that Social Security benefits buy roughly 86 cents worth of goods and services for every dollar they bought in an earlier baseline year, attributing the gap primarily to CPI-W's underweighting of healthcare costs relative to what older beneficiaries actually spend.
This is part of why some advocacy groups have pushed for years to switch the COLA formula from CPI-W to CPI-E, an experimental index the Bureau of Labor Statistics has published since the 1980s that's designed to better track spending patterns of Americans 62 and older. No such change has been enacted as of 2026, and any switch would require an act of Congress.
6. COLA Impact Calculator
This calculator estimates the dollar impact of a given COLA percentage on your own benefit, with an option to account for a possible Medicare Part B premium increase. Use the slider to test different COLA scenarios as new estimates are published between now and October.
🧮 2027 COLA Impact Calculator
Educational estimate only — the SSA's official COLA is not yet announced
✅ Key Takeaways
- The 2027 COLA is estimated at roughly 3.5%–3.6% as of August 2026, but remains unofficial until the SSA's mid-October announcement.
- The COLA is calculated from Q3 CPI-W data comparing this year's July–September average to last year's, per a formula unchanged for decades.
- Recent COLAs: 8.7% (2023), 3.2% (2024), 2.5% (2025), 2.8% (2026, confirmed).
- Rising Medicare Part B premiums typically offset part of any COLA increase for beneficiaries who have it deducted from their check.
- Advocacy groups argue the CPI-W-based formula understates retirees' real cost-of-living increases, particularly for healthcare.
7. Frequently Asked Questions
As of the August 2026 estimate from The Senior Citizens League, the 2027 Social Security cost-of-living adjustment is projected at 3.6%, down from earlier 2026 projections that had run closer to 3.8%–3.9% before cooling. AARP's independent estimate around the same time projected 3.5%. Both figures remain estimates until the Social Security Administration's official announcement, expected in mid-October 2026.
The Social Security Administration typically announces the official COLA in mid-October, based on the U.S. Bureau of Labor Statistics' Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W) data for July, August, and September. The 2026 COLA of 2.8% was announced in October 2025 following this same schedule, and the 2027 announcement is expected on a similar timeline.
The COLA is based on the percentage increase in the average CPI-W for the third quarter (July, August, September) of the current year compared to the average CPI-W for the third quarter of the last year in which a COLA was determined. If there is no percentage increase, no COLA is applied for that year, though this has only happened a handful of times in the program's history.
For most beneficiaries who have Medicare Part B premiums deducted directly from their Social Security check, yes, at least partially. The Medicare Part B premium for 2026 is $202.90 per month, and it has historically risen most years, which reduces the net increase in a beneficiary's take-home check even when the COLA itself is positive.
The Senior Citizens League's annual buying-power study has found that Social Security benefits have lost a meaningful share of their purchasing power since 2010, estimating benefits buy roughly 86 cents worth of goods and services for every dollar they bought in earlier comparison years. The study attributes this gap to the COLA formula's CPI-W basis not fully capturing the specific spending patterns, particularly higher healthcare costs, that older beneficiaries face.
Recent annual COLAs were 8.7% for 2023 (reflecting the 2022 inflation surge), 3.2% for 2024, 2.5% for 2025, and 2.8% for 2026. The 2027 COLA remains a projection until the SSA's official October 2026 announcement, with recent estimates clustering between roughly 3.5% and 3.6%.
8. Update Archive
Financial Tools & Official Resources
📎 Sources & External References
- Social Security Administration — Cost-of-Living Adjustment (COLA) Information, ssa.gov/oact/cola, accessed September 2026.
- U.S. Bureau of Labor Statistics — Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W), bls.gov/cpi.
- The Senior Citizens League — 2027 COLA estimate and annual Social Security buying-power studies, seniorsleague.org, August 2026.
- AARP — 2027 Social Security COLA coverage and estimate tracking, aarp.org.
- Centers for Medicare & Medicaid Services — 2026 Medicare Part B premium and deductible announcement, cms.gov.