Why Boomers Claiming Today Lock In COLA Compounding That Future Retirees May Miss

"A 67-year-old filing for Social Security this spring receives her first check at $2,500 a month. By claiming under today's rules, she has locked in a cost-of-living adjustment (COLA) formula that compounds in her favor for life, whether she realizes it or not. The 2026 cost-of-living adjustment came in at 2.8%, applied to roughly 71 million beneficiaries in January. Every year forward, her benefit adjusts by whatever inflation methodology Congress has on the books. Over 25 years, that compounding can be worth six figures."

"Social Security uses CPI-W, the inflation index for urban wage earners. Each year's COLA stacks on top of the prior year's adjusted benefit. Take a $2,500 starting benefit. Apply a 2.5% average COLA for 25 years and that benefit grows to roughly $4,635 a month by age 92. The same $2,500 with a 2.0% average COLA reaches only about $4,103. Across a long retirement, the difference adds up to roughly $130,000 in lifetime payments."

"Chained CPI has historically run below CPI-W, meaning a formula switch would erode purchasing power with each passing year. That proposal has been floated repeatedly on Capitol Hill, and a change would almost certainly apply prospectively, with proposals aimed at future claimants more aggressively than people already drawing checks. Congress grandfathered current beneficiaries during the 1983 Social Security overhaul, phasing changes in for younger workers. That precedent is the strongest pattern we have, even if it falls short of an ironclad guarantee."

A 67-year-old receiving a first Social Security check of $2,500 a month locks in a COLA formula that adjusts benefits each year using Congress’s inflation methodology. The 2026 COLA was 2.8% and applied to about 71 million beneficiaries. Social Security applies COLA using CPI-W, and each year’s adjustment stacks on the prior year’s benefit. Over 25 years, a 2.5% average COLA can raise a $2,500 starting benefit to about $4,635 per month, while a 2.0% average COLA can raise it to about $4,103. The difference can total roughly $130,000 in lifetime payments. Chained CPI has historically been lower than CPI-W, and changes would likely apply prospectively, with current beneficiaries often protected by grandfathering.

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