In 2026, Social Security beneficiaries received a 2.8% cost-of-living adjustment. This was higher than the COLA from the year prior but significantly below some of the other adjustments in the post-pandemic era.

COLAs are critical to the financial security of seniors who rely on Social Security for income, as the value of benefits would continually decline without adjustments to blunt the impact of inflation. Since these adjustments help seniors make ends meet, retirees are often eager for news about the upcoming COLA they'll collect.

Recently, retirees got a major update on the COLA estimates for 2027. Here are the current estimates, along with some details on why the numbers have changed.

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This is the new estimate for the 2027 COLA

According to Mary Johnson, an independent Social Security analyst, retirees could be on track for a Social Security COLA of 4.7% or higher in 2027, while The Senior Citizens League (a senior advocacy group) is predicting a 3.8% increase next year.

These predictions are considerably higher than earlier estimates. Johnson, for example, had predicted a 1.2% COLA based on January data, but her estimates have been inching up throughout the year.

COLA estimates are surging for a simple reason. Bureau of Labor Statistics data released in June showed a 4.2% year-over-year increase in the Consumer Price Index for All Urban Consumers (CPI-U) in May.

This number will not be part of the official COLA formula, which is calculated using third-quarter data from the Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W). But it still indicates that inflation is likely to remain persistently high, leading to retirees getting a big benefits bump.

A big COLA isn't necessarily all it's cracked up to be

News of a bigger boost to Social Security benefits isn't necessarily something retirees want -- even if receiving more money is rarely a bad thing.

The problem is that the benefits bump is tied directly to inflation levels that remain well above the Federal Reserve's 2% target rate. High inflation can wreak havoc on the finances of retirees who depend on income from retirement plans, which are often invested conservatively.

Few retirees end up better off with a bigger Social Security payment, while their 401(k) or IRA distributions lose buying power. But that's exactly what often happens when prices rise rapidly. Retirees should hope that the latest inflation numbers -- the highest in three years -- are outliers caused by soaring energy prices due to overseas conflict, and that they end up with a much smaller raise in the end.

Otherwise, their wallets may take a hit even as their Social Security checks get bigger.