BLS to Release July CPI-W on Aug. 12 as 2027 Social Security COLA Tracks 3.8%

Q: Why might your past financial decisions trigger unexpected surcharges that quietly drain your upcoming 2027 Social Security benefits?

Your 2027 Social Security increase could be quietly reduced because Medicare’s high-income surcharges, known as IRMAA, are based on your 2025 tax return, not what you earn in 2027. That two-year lookback means past financial moves can come back to affect you later. A Roth conversion, a large IRA withdrawal, big capital gains from investments, taxable profit on a home or property sale, or even tax-exempt municipal bond interest can raise your modified adjusted gross income enough to trigger IRMAA. If that happened in 2025, you may pay higher Medicare Part B and Part D premiums in 2027, with those extra costs often deducted directly from your Social Security check. The surprise is worsened by the “cliff” structure of IRMAA. Going just $1 over a threshold can push you into a higher bracket and add hundreds or even thousands of dollars a year in surcharges. For 2027, projected thresholds are expected to rise somewhat with inflation, but they will still apply based on 2025 income. So a one-time income spike from a past decision can reduce how much of your 2027 COLA you actually keep. For retirees, that means the headline COLA may overstate the real gain. Higher standard Medicare premiums alone can eat into the increase, and IRMAA can take an even bigger bite for higher-income beneficiaries. If your income later fell because of retirement, divorce, or the death of a spouse, you may be able to ask Social Security for a new determination using Form SSA-44.

3 articles · Updated · Yahoo Finance · Aug 7

Aug. 12 will bring the first of three 2026 CPI-W readings that feed directly into the 2027 Social Security cost-of-living adjustment, giving retirees their first firmer estimate for next year.
The COLA is based on third-quarter CPI-W changes from a year earlier, so July's figure is only an early input; the final adjustment will not be set until the September reading is released on Oct. 14.
TSCL currently estimates the 2027 COLA at 3.8%, up 1 percentage point from the 2026 adjustment.
A 3.8% increase would add about $79 to the average $2,084 monthly retirement benefit recorded in June 2026, though higher Medicare Part B premiums could offset part of that gain.
Social Security recipients will get personalized COLA notices in December showing their net benefit after Part B deductions, a key figure for final 2027 budgeting.