Social Security's 2027 raise is 3.6%. It isn't a raise.

Nobody at Social Security picks the COLA. A formula does. The SSA averages the CPI-W, the inflation index for urban wage earners and clerical workers, across July, August, and September, compares that average to the same quarter a year earlier, and rounds to the nearest tenth of a percent. That's the whole calculation. Your 2.8% for 2026 came out of exactly two numbers: a third-quarter 2024 average of 308.729 against a third-quarter 2025 average of 317.265.

So the 3.6% getting quoted right now rests on one month of data. July's CPI-W came in at 3.4% year over year, part of a report where overall prices rose 0.1% on the month and 3.4% on the year. August and September still have to land. SSA announces the real figure on October 14, and it almost certainly won't be exactly 3.6%.

Your employer raises your pay for the work you're about to do. The COLA runs the other direction. It measures prices that already went up, then adjusts your check starting the following January.

Look at the timing on a real purchase. Something that got more expensive last October is priced into the third-quarter 2026 average, so the compensation for it shows up in your January 2027 payment. That's 15 months of paying the higher price out of the old benefit. Across a full year of rising prices, the money that covers them always arrives after you've spent it. That lag is the actual complaint, and it's why the Senior Citizens League's director talks about seniors losing purchasing power while they wait instead of arguing about the size of the percentage.

Part B premiums come out of the Social Security payment before it's deposited. You don't write a check, you just get a smaller one. The standard premium is $202.90 a month in 2026, with a $283 annual deductible on top. The Medicare Trustees project $209.50 for 2027, a 3.25% increase.

Both of those are projections, and CMS sets the real premium in the fall. But take them at face value and $6.60 of that $69.75 disappears before you see it. Close to a tenth of the raise, gone to one line item, in a year where the Trustees expect an unusually mild premium increase.

$2,007.28 a month works out to roughly $24,100 a year. That's the average retired-worker benefit if 3.6% holds. And it's indexed to stay level against a basket of prices, which tells you what Social Security is for. It's built to keep you from falling behind, not to move you forward.

There's a wrinkle in which basket. CPI-W tracks the spending of wage earners and clerical workers, by definition. Retirees buy a different mix, weighted more toward medical care. Even a perfectly executed COLA is matching someone else's shopping cart. So treat that $24,000 as a floor that stays roughly flat in real terms for the rest of your life, and size your own savings to cover everything above it. A retirement plan that counts on the COLA outrunning your costs is counting on something the formula was never built to do.