The Social Security Administration has confirmed a 3.6% cost-of-living adjustment for 2027. It begins with benefits payable in January 2027 for nearly 72 million Social Security beneficiaries, and with the December 31, 2026 payment for about 7.3 million Supplemental Security Income (SSI) recipients.
It is the largest COLA in four years - the biggest since the 8.7% raise for 2023, and well above the 2.8% for 2026.
Below is the arithmetic behind it, what it adds to a real monthly check, and the part Medicare is projected to take back.
How the number was reached
The COLA is not a forecast or a policy decision. It is a formula written into law: the average CPI-W (the consumer price index for urban wage earners and clerical workers) for July, August and September, measured against the same three months a year earlier, rounded to the nearest tenth of a percent.
| Jul | Aug | Sep | Average | |
|---|---|---|---|---|
| 2025 | 316.349 | 317.306 | 318.139 | 317.2647 |
| 2026 | 327.104 | 328.481 | 330.654 | 328.7463 |
That works out to 3.619%, which rounds to the official 3.6%. We computed it ourselves from the Bureau of Labor Statistics data series rather than copying a headline, and it matches the SSA announcement exactly.
September decided it. The CPI-W jumped 2.173 points from August to September - a 0.66% rise in a single month, the largest of the three counting months. Here is exactly what September needed to print for each possible outcome:
| September CPI-W | Official COLA |
|---|---|
| Below 329.046 (a flat September was 328.481) | 3.4% |
| 329.046 to 329.997 | 3.5% |
| 329.998 to 330.948 (actual: 330.654) | 3.6% |
| 330.949 or higher | 3.7% |
A completely flat September would have produced 3.4%. Even a repeat of August’s rise would only have reached 3.5%. Inflation picked up in September, and that pushed the raise to 3.6%.
If you see “3.9%” quoted, that is not the COLA. The CPI-W rose about 3.9% over the twelve months to September, and some posts are already repeating that as the raise. The COLA uses a three-month average against a three-month average, which is why it is 3.6%.
What it adds in dollars
SSA publishes its own estimates of average monthly benefits before and after the raise, payable in January 2027:
| Beneficiary | Before 3.6% COLA | After 3.6% COLA | Monthly increase |
|---|---|---|---|
| All retired workers | $2,095 | $2,170 | +$75 |
| Aged couple, both receiving benefits | $3,238 | $3,355 | +$117 |
| Aged widow(er) alone | $1,936 | $2,005 | +$69 |
| All disabled workers | $1,642 | $1,701 | +$59 |
| Disabled worker, spouse and one or more children | $2,970 | $3,077 | +$107 |
| Widowed mother and two children | $3,932 | $4,074 | +$142 |
For the average retired worker, that is about $75 more a month, or roughly $900 over 2027.
Why you will see slightly different dollar figures elsewhere. Before the announcement, most estimates (including ours) used SSA’s July 2026 statistical snapshot, which put the average retired-worker benefit at $2,085.98. SSA’s own January 2027 estimate is a little higher at $2,095, because the average keeps rising as new, higher-earning retirees join. Other outlets quote the average across all beneficiaries, which is lower again. None of these is wrong; they answer different questions. Every figure above is SSA’s own.
What Medicare takes back
Most retirees have their Medicare Part B premium deducted straight from their Social Security check, so the premium increase eats part of the raise before it reaches the bank.
The 2027 Part B premium has not been announced yet - SSA says Medicare’s 2027 figures will come from Medicare, and CMS normally sets the premium in November. The standard premium is $202.90 a month in 2026. The 2026 Medicare Trustees Report projects $209.50 for 2027, an increase of $6.60 (3.25%). Treat that as a projection.
On that projection, here is the average retired worker’s check:
| 2026 | 2027 | Change | |
|---|---|---|---|
| Gross monthly benefit | $2,095.00 | $2,170.00 | +$75.00 |
| Medicare Part B premium (2027 projected) | $202.90 | $209.50 | +$6.60 |
| Net in the bank | $1,892.10 | $1,960.50 | +$68.40 |
Some private forecasters expect a higher 2027 premium, in the $216 to $219 range. If they are right, the Part B increase would be $13.10 to $16.10, and the average net raise would be about $59 to $62 a month instead of $68.
Two groups see different math: higher-income beneficiaries pay income-related surcharges (IRMAA) on top of the standard premium, and people whose Part B premium is paid by a Medicare Savings Program keep the whole raise.
What else changes in 2027
SSA’s 2027 fact sheet, released alongside the COLA:
| 2026 | 2027 | |
|---|---|---|
| Maximum taxable earnings (Social Security) | $184,500 | $192,300 |
| Earnings limit, under full retirement age all year | $24,480 | $25,560 |
| Earnings limit, the year you reach full retirement age | $65,160 | $67,920 |
| Earnings needed for one quarter of coverage | $1,890 | $1,970 |
| SSI federal payment, individual | $994 | $1,029 |
| SSI federal payment, couple | $1,491 | $1,544 |
| Substantial gainful activity (non-blind) | $1,690 | $1,770 |
| Maximum benefit, worker retiring at full retirement age | $4,152 | $4,188 |
- The wage base came in higher than projected. The Trustees had projected $190,200; the official figure is $192,300. If you earn above it, the extra $7,800 of capped earnings means up to $483.60 more Social Security tax for an employee in 2027 (6.2% of $7,800), or twice that if you are self-employed.
- The earnings test still works the same way: under full retirement age all year, SSA withholds $1 for every $2 you earn above $25,560; in the year you reach full retirement age, $1 for every $3 above $67,920, counting only earnings before the month you reach full retirement age.
- Full retirement age is 67 for anyone born in 1960 or later. Unchanged, and not affected by the COLA.
How the forecasters did
In the versions we tracked on September 16, after the August data: TSCL estimated 3.5%, Mary Johnson 3.5%, CRFB 3.4% and AARP 3.6%. Only AARP’s 3.6% landed exactly. The difference was September, which rose more than the other forecasts assumed. Our estimate post published the September print behind each forecast - 330.474 for exactly 3.6% - and the actual came in at 330.654.
The honest context
A COLA is not a raise. It tries to stop a fixed income from losing ground, and it is backward-looking by design: it compensates for prices that already went up, arriving up to fifteen months after some of that inflation happened.
What is different this year is the Medicare side. In several recent years the Part B premium rose faster than the COLA and swallowed much of the increase. On the Trustees’ projection, the 2027 premium rises 3.25% while benefits rise 3.6%, so most of this raise should actually reach the bank. That stays a projection until CMS announces the real premium.
If you are still years from claiming, the retirement calculator shows how much you may need on top of Social Security, and the 4% rule guide explains how a portfolio and a COLA-adjusted benefit work together.
FAQ
When does the 2027 COLA start?
With benefits payable in January 2027 for Social Security beneficiaries. SSI recipients get the increase starting with the payment on December 31, 2026.
Why is the COLA 3.6% when inflation was reported at 3.9%?
Because they measure different things. The 3.9% figure is the twelve-month change in the CPI-W to September. The COLA compares the average of July, August and September 2026 with the same three months of 2025, which gives 3.6%. Headline inflation in the news is usually CPI-U, a different index again.
Do I have to do anything to get it?
No. It is applied automatically. SSA says COLA notices will be available online in late November 2026 in the Message Center of your my Social Security account, and mailed notices follow in December.
Will my Medicare premium eat the whole increase?
Not on current projections. For the average retired worker, the raise is $75 a month and the projected Part B increase is $6.60, leaving about $68 more in the bank each month. If CMS sets the premium at the higher end of private forecasts, the net raise is closer to $59 to $62. CMS normally announces the 2027 premium in November.
Is 3.6% a big COLA?
It is the largest in four years. The COLA was 2.8% for 2026, 2.5% for 2025 and 3.2% for 2024. The last bigger one was the 8.7% raise for 2023.
Sources
- Social Security Administration, COLA information for 2027, October 14, 2026 (ssa.gov/cola): the 3.6% COLA, beneficiary counts, payment timing, the taxable maximum, earnings limits and the online notice timing
- Social Security Administration, 2027 COLA fact sheet, October 14, 2026: estimated average benefits before and after the COLA and every 2026-vs-2027 figure in the tables above
- Bureau of Labor Statistics, CPI-W series CWUR0000SA0, retrieved October 14, 2026; the third-quarter averages, the 3.619% unrounded COLA and the September thresholds were computed from that series
- BLS CPI release schedule (bls.gov/schedule/news_release/cpi.htm): September 2026 CPI published October 14, 2026, 08:30 ET
- CMS, 2026 Medicare Parts A and B premiums fact sheet: 2026 standard Part B premium of $202.90
- 2026 Medicare Trustees Report (CMS Office of the Actuary): projected 2027 standard Part B premium of $209.50, intermediate assumptions; still a projection until CMS announces the premium
