When Will the 2027 Social Security COLA Be Announced? Key Date, Latest Estimate & Payment Increase

The 2027 Social Security cost-of-living adjustment will be announced on Wednesday 14 October 2026 — 50 days from now, and the same day the Bureau of Labor Statistics publishes the September Consumer Price Index.

Those two things are the same event for a reason. The COLA is not a decision anybody makes; it falls out of a formula written into the Social Security Act, and September’s inflation reading is the last number that formula needs.

When will the 2027 Social Security COLA be announced?

Wednesday 14 October 2026. BLS has the September CPI scheduled for 8:30am that morning, and SSA has announced the COLA on the day of that release in each of the last five years.

The pattern in SSA’s own press release archive is tight:

Why 14 October, and could it move?

It could, and last year it did.

Look again at that table. Four of the five announcements land between the 10th and the 13th of October. The fifth, in 2025, came on the 24th — nearly a fortnight later. That was not SSA changing its mind; the September 2025 CPI was itself published on 24 October, and the announcement followed it the same day.

So the date to watch is really the CPI date. If the September 2026 release holds at 14 October, the COLA comes that morning. If that release slips, expect the COLA to slip with it by roughly the same amount.

How is the COLA actually calculated?

By comparing one three-month average with another. The Social Security Act sets it out: take the average CPI-W across July, August and September, compare it with the average for the same quarter of the last year a COLA took effect, and round the increase to the nearest tenth of a percentage point.

The base for this one is already fixed and public. SSA’s 2025 third-quarter CPI-W figures were 316.349 for July, 317.306 for August and 318.139 for September, averaging 317.265. That is the number the 2026 quarter will be measured against.

And here is the part most coverage skips: only July has been published. Its CPI-W came in at 327.104, up 3.4% on the year. August arrives on 11 September and September on 14 October. Two-thirds of the arithmetic does not exist yet.

One more thing about that index is worth knowing, because it is unusual and it is not an accident. CPI-W is not a retirees’ index. BLS defines its population as households where more than half of income comes from clerical or wage occupations and at least one earner worked 37 weeks or more in the past year — roughly 30% of the US population, and by construction a working one. The adjustment that keeps retirement benefits level with prices is therefore pegged to what wage-earning households buy, not to what retirees buy. That is a long-running criticism of the mechanism rather than a flaw in this year’s number, but it explains why some groups argue for a different index entirely.

What is the latest 2027 COLA estimate?

The most-quoted one is 3.6%, from The Senior Citizens League, published on 12 August 2026. TSCL runs a statistical model each month and its headline that day was that the projection had fallen to 3.6% — a reminder that these numbers move.

Why do these projections wander? Because the underlying reading has. TSCL’s own account of 2026 has the annual CPI-W change starting the year at 2.2%, climbing to 4.4% by May, then falling back to the 3.4% that July recorded. A model fed a series that has doubled and halved inside seven months will produce a different answer each month, and it has.

It is worth seeing what the formula alone produces. Take July’s actual 327.104, hold August and September at that same level, and run SSA’s own calculation:

(327.104 − 317.265) ÷ 317.265 × 100 = 3.1%

So the statutory formula on published data gives 3.1%; the model gives 3.6%. That half-point gap is not a disagreement about the past — it is entirely an assumption about two months nobody has measured. TSCL’s model expects inflation to run higher than the current 3.4% annual CPI-W change; hold it flat instead and you land lower. Neither is a forecast this page endorses.

How much would that add to a monthly payment?

On the average retirement benefit of $1,937.53, the two scenarios come out like this:

Over a year that is the difference between roughly $721 and $837. If you want your own number rather than the average, our 2027 COLA calculator runs both scenarios against whatever you type in.

How does that compare with recent years?

Either scenario would be the largest increase in four years, and both sit close to the long-run middle rather than at an extreme.

Note the 2016 bar. It is zero, and that is not a rendering error — the statute says in as many words that if there is no increase, or the rounded increase is zero, there is no COLA that year. In the fifty years of adjustments since 1975 it has happened exactly three times, and all three are recent: the increases for 2010, 2011 and 2016 were all zero. An adjustment is not guaranteed; it is the output of a subtraction that can come out flat.

SSA noted alongside last year’s announcement that the COLA has averaged about 3.1% over the past decade. The distribution behind that average is lopsided, though: TSCL’s figures put the 2010–2019 average near 1.4%, against about 3.7% across 2020–2025. The quiet decade and the noisy one are different regimes, and the average sits between two things that rarely happen.

When would a 2027 COLA actually reach you?

Not in October. The announcement is just the number.

It is a number with a wide reach: SSA put last year’s increase at 75 million Americans, covering nearly 71 million Social Security beneficiaries and about 7.5 million people receiving SSI.

The increase applies to benefits for December 2026, which are paid in January 2027 — that is why SSA’s actuarial tables index it as the 2026 COLA while its press releases call it the increase for 2027. SSI recipients see it slightly earlier, because the January SSI payment is issued at the end of the preceding December.

SSA begins mailing notices of the new amount in early December, and account holders can read the same notice online instead. Last year the agency set a mid-November deadline for opting out of paper notices, so if you want yours digitally, that switch is worth making before the announcement rather than after.

What else changes at the same time?

Two things, both worth knowing if you are still working or on Medicare.

The taxable maximum — the ceiling on earnings subject to Social Security tax — is announced in the same release, and it moves with average wages rather than with prices. For 2026 it went to $184,500 from $176,100.

Medicare premiums are separate and land later. Last year SSA pointed people to late November for the following year’s Part B figure. That timing matters because Part B is usually deducted straight from a Social Security payment, so the COLA and the premium together decide what actually arrives in the bank — and the second half of that sum is not known on announcement day.