If you rely on Social Security, the single most important number in your budget for next year is being decided right now — and it just moved against you. As recently as mid-June, independent forecasters were penciling in a 2027 cost-of-living adjustment (COLA) as high as 4.7%. Then the June inflation report came in cooler than expected, and the estimates fell fast. As of late July 2026, the Senior Citizens League pegs the 2027 COLA at 3.8%, analyst Mary Johnson at 3.7%, and AARP at 3.6%. That's still a meaningful raise. But between how the raise is calculated and how Medicare claws part of it back, the number that actually hits your account will be smaller than the headline — and it's worth understanding exactly how before the final figure is announced in October.
Why the estimate dropped — and why it isn't final yet
The COLA isn't a guess or a political decision; it's a formula. By law, Social Security compares the average CPI-W — the Consumer Price Index for Urban Wage Earners and Clerical Workers — for July, August and September against the same three months a year earlier. Whatever that year-over-year change works out to becomes the raise. Nothing before July counts, and nothing after September does either.
That's why the estimate has been sliding. Earlier in 2026, inflation was running hot enough to support a forecast near 4.7%. But the June CPI-W came in up just 3.5% from a year earlier, and cooler inflation means a smaller adjustment. The forecasters simply updated their models to match the new data.
The practical takeaway: today's 3.6%–3.8% range is an educated projection, not the real number. The July CPI-W report is due August 12, and the Social Security Administration won't announce the official 2027 COLA until mid-October, once September's data is in. A hotter-than-expected August or September could nudge it back up; another cool month could pull it lower still.
What a 3.7% raise adds to the average check
Run the middle-of-the-range estimate against the average benefit and the gross math is straightforward. The average retirement benefit is about $1,937.53 a month. A 3.8% COLA would add roughly $73.62, pushing it to about $2,011.15 — the first time the typical check would clear $2,000. A 3.6% raise lands closer to a $70 increase; at 3.7%, figure on about $72.
Your own number will differ from the average, and the direction is simple: the bigger your current benefit, the bigger the dollar raise, because the same percentage is applied to a larger base. Someone collecting $3,000 a month sees more than double the dollar increase of someone collecting $1,400 — even though the percentage is identical.
The reason to care about the exact figure isn't vanity. It's that a fixed-income budget is built on that monthly number, and a $70 swing across twelve months is more than $800 a year. Knowing whether to plan around $70 or $79 matters when every line item is tight.
The Medicare Part B bite that shrinks the raise
Here's the part that catches people off guard every year: the COLA is the gross raise, not the net one. For most retirees, the standard Medicare Part B premium is deducted directly from the Social Security check before it's paid — so a premium increase eats into the raise automatically.
And Part B is going up. The standard premium is projected to rise to roughly $218.60 in 2027, from $202.90 in 2026 — an increase of about $15.70 a month. Stack that against a projected $74 gross COLA and the net gain shrinks to about $58 a month. In other words, close to a fifth of the average raise is absorbed by Medicare before it ever reaches you.
There is a floor, though. The 'hold harmless' provision bars your standard Part B premium increase from exceeding your dollar COLA in a given year — so for most beneficiaries, a rising premium can't actually push the net check below what it was the year before. It can flatten your raise, but it can't reverse it. (Hold harmless doesn't cover everyone — notably those new to Medicare, higher earners paying income-related surcharges, and a few other groups — so check your own status.)
Three things worth checking before October
- Your gross-to-net gap. Take your current monthly benefit, add your projected COLA (try 3.7% as the middle estimate), then subtract about $15.70 for the expected Part B increase. That net figure — not the headline percentage — is what your 2027 budget should be built on.
- Whether hold harmless applies to you. If you're new to Medicare in 2026 or 2027, pay an income-related Part B surcharge (IRMAA), or have premiums paid by Medicaid, the standard protection may not shield you the same way. Confirm which bucket you're in.
- Your tax exposure. A raise can quietly push more of your benefit into the taxable range if your combined income crosses the $25,000 (single) or $32,000 (married filing jointly) thresholds — figures that haven't been indexed for inflation in decades, so each COLA pulls more retirees over the line.
Don't build your 2027 budget on the headline
When the official COLA is announced in October, resist planning around the percentage. Convert it to your own dollar figure, subtract the Part B premium change, and only then update your budget. The net number is almost always $15–$20 a month lighter than the raise the headlines celebrate.
A 3.6%–3.8% COLA would be a solid raise by historical standards — bigger than the 2.5% retirees got for 2025 — and enough to lift the average check past $2,000 for the first time. But the headline percentage and the money that actually lands in your account are two different numbers, separated by a rising Medicare premium and, for some, a bigger tax bill. The official figure arrives in mid-October, after the July, August and September inflation data is final. Between now and then, the smartest move is to run your own net-check math so the announcement confirms a plan you've already made — rather than dictating one you haven't. To estimate how your benefit and cost-of-living adjustments compound over a full retirement, run the numbers through the LoanPal Social Security Benefits Estimator.
