Social Security 2027 COLA: Official Announcement Date, Prediction Projections and Increase Details

Millions of Americans receiving Social Security will learn the size of their 2027 cost-of-living adjustment (COLA) on Wednesday, 14 October 2026, with the latest projection suggesting benefits could rise by 3.6%.

The Senior Citizens League (TSCL), a nonpartisan seniors' advocacy group, released its latest forecast on 12 August after new inflation figures became available.

The estimate is 0.8 percentage points higher than the 2.8% COLA beneficiaries received for 2026, although the final figure could still change before October.

Social Security beneficiaries received a 2.8% increase for 2026, which the Social Security Administration estimated would add about $56 (£41.08) per month to the average retirement benefit. Nearly 71 million Social Security beneficiaries received that adjustment beginning in January 2026.

The question now is whether inflation over the remaining months used in the calculation will keep the 2027 increase near 3.6%.

Social Security 2027 COLA Currently Projected at 3.6%

TSCL's latest forecast puts the 2027 cost-of-living adjustment at 3.6%, down from its 3.8% projection in July.

According to TSCL, if a 3.6% COLA were applied to the average benefit figure used in its modelling, a monthly payment of $1,937.53 (£1,421.28) would increase by $69.7 (£51.16) to $2,007.28 (£1,472.44).

Those figures should not be confused with SSA's official average retired-worker benefit. SSA estimated that the average retired-worker benefit payable in January 2026 would rise from approximately $2,015 (£1,478.00) to $2,071 (£1,519.08) following the 2.8% COLA.

The 3.6% forecast also remains just that — a forecast. Two months of data used in determining the final adjustment were still outstanding when TSCL published its August estimate.

If the projection holds, the 2027 COLA would exceed the increases of 2.8% in 2026, 2.5% in 2025 and 3.2% in 2024.

How the 2027 Social Security COLA Is Calculated

This section needs the biggest factual correction from the original draft. The Social Security Administration does not calculate the COLA using interest rates or unemployment, nor does it simply track cumulative inflation throughout the entire year.

Federal law bases the adjustment on the Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W). For the 2027 adjustment, the government will compare the average CPI-W during July, August and September 2026 with the average for the same three months in the previous year. The percentage increase, if any, determines the COLA.

TSCL may use broader economic information when producing forecasts before all three months of CPI-W data are available, but those projections are separate from the statutory formula SSA ultimately uses.

July's CPI-W showed a year-over-year increase of 3.4%, according to TSCL. August inflation data are scheduled for release on 11 September, followed by September data on 14 October.

That final September release will provide the last piece of information needed to calculate the 2027 COLA.

When Will the 2027 COLA Be Announced?

The official 2027 COLA is expected on Wednesday, 14 October 2026. TSCL identifies that as SSA's announcement date, while the Bureau of Labor Statistics has scheduled its September Consumer Price Index release for 8.30am Eastern Time that morning.

The increase will apply to Social Security benefits beginning in January 2027. Supplemental Security Income (SSI) is also adjusted using the COLA.

For comparison, the 2026 increase raised the maximum federal SSI payment to $994 (£729.05) per month for an eligible individual and $1,491 (£1,093.65) for an eligible couple. Exact 2027 SSI amounts will not be known until the COLA is finalised.

What Would a 3.6% COLA Mean for Beneficiaries?

The effect will depend on each person's existing benefit rather than providing everyone with the same dollar increase.

For retirees, the increase is intended to prevent Social Security benefits from losing purchasing power as consumer prices rise.

However, a larger COLA does not necessarily mean recipients will feel substantially better off. The adjustment reflects higher prices that beneficiaries have already faced, rather than representing an increase in their underlying purchasing power.

Forecast Could Still Change Before October

There is still considerable uncertainty surrounding the final number. TSCL's projection stood at 3.8% in July before falling to 3.6% following the latest inflation data.

That movement illustrates why beneficiaries should avoid treating any current projection as guaranteed. There is also a notable difference between short-term forecasts and the government's longer-term assumptions.

The 2026 Social Security Trustees Report's intermediate assumptions projected a 2.7% COLA payable in January 2027, although that estimate was produced using longer-term economic assumptions rather than the latest monthly inflation data.

For beneficiaries, the dates that matter now are 11 September, when August CPI data are scheduled for release, and 14 October, when September's figures are due and the official 2027 COLA is expected to become known. Until then, 3.6% remains one prominent projection rather than the official increase.