Quick answer: Social Security COLA calculator: a 3.5% increase would add about $35 a month for each $1,000 of a current gross Social Security benefit. The 3.5% figure is a non-government estimate—not the official 2027 cost-of-living adjustment (COLA). The final amount depends on the third-quarter CPI-W data, including September, which BLS has scheduled to release on October 14, 2026.
Updated September 27, 2026. This is an illustrative calculation, not an SSA benefit quote or personalized financial advice.
2027 Social Security COLA calculator: estimate a 3.5% scenario
Multiply your current monthly benefit by 0.035, then add the result to your current benefit. These examples assume a 3.5% adjustment and exclude Medicare premiums, tax withholding, and other deductions.
| Current monthly benefit | Illustrative monthly increase | Estimated gross benefit |
|---|---|---|
| $1,000 | $35.00 | $1,035.00 |
| $1,250 | $43.75 | $1,293.75 |
| $1,500 | $52.50 | $1,552.50 |
| $2,000 | $70.00 | $2,070.00 |
| $2,085.98 | $73.01 | $2,158.99 |
| $2,500 | $87.50 | $2,587.50 |
The $2,085.98 baseline is SSA’s July 2026 average monthly benefit for retired workers. Applying 3.5% gives an illustrative increase of about $73.01. It is not a prediction of any individual’s payment.
Is the 2027 Social Security COLA officially 3.5%?
No. As of September 27, 2026, SSA has not announced the 2027 COLA. The Senior Citizens League (TSCL), an advocacy organization, projected 3.5% in a September 11 update. Other forecasters may differ because their assumptions and update dates differ. Only the statutory calculation using completed third-quarter CPI-W data determines the official adjustment.
The latest completed official CPI-W reading is for August: the index was 328.481, up 0.4% over the month on a not-seasonally-adjusted basis and 3.5% over 12 months. That annual CPI-W rate is useful context, but it is not the COLA formula by itself.
How Social Security calculates a COLA
SSA compares the average CPI-W for July, August, and September of the current year with the average for the third quarter of the last year in which a COLA took effect. For the 2027 adjustment, September 2026 is the final missing month. If the calculation produces an increase, the statutory rules round the result to the nearest one-tenth of a percentage point.
BLS scheduled its September 2026 CPI release for October 14 at 8:30 a.m. Eastern Time. The CPI-W figure completes the quarter’s data. Verify SSA’s official determination directly after the final CPI-W data are available; do not treat a forecast, an online calculator, or CPI-U as the final answer.
Why your take-home amount may differ
- The estimate may change: September CPI-W is not yet available, so 3.5% remains a scenario.
- Your base benefit is individual: claiming history, benefit type, and SSA adjustments affect the amount used.
- Deductions can change: Medicare premiums, tax withholding, and other deductions can affect the net deposit.
- Rounding matters: the table uses simple 3.5% arithmetic; SSA calculates the official COLA under the law.
For the latest CPI-W context and October timing, see our 2027 Social Security COLA and CPI-W guide and August CPI-W update. We will distinguish the official result from estimates when September data arrive.
What to watch next
- Confirm the September CPI-W release and reference month on BLS.gov.
- Check July, August, and September CPI-W—not just the CPI-U headline.
- Look for SSA’s official calculation before changing a household budget.
- Apply the final percentage to your own gross benefit, then account for deductions separately.
Frequently asked questions
How much would a 3.5% COLA add to a $2,000 benefit?
In a simple gross-benefit scenario, 3.5% of $2,000 is $70, producing an illustrative monthly amount of $2,070 before deductions.
When will the official 2027 COLA be known?
The September CPI report is scheduled for October 14, 2026, at 8:30 a.m. ET. Verify the SSA’s official determination after final CPI-W data are available.
Does a 3.5% CPI-W increase mean the COLA must be 3.5%?
No. The annual CPI-W rate and Social Security COLA use different calculations. The COLA compares third-quarter average index levels across the relevant years.
Primary sources and methodology
- SSA: How the COLA is calculated
- SSA: Monthly Statistical Snapshot, July 2026
- BLS: Consumer Price Index, August 2026
- BLS: 2026 release schedule
- TSCL: September 11, 2026 projection
Disclosure: Educational information only; not individualized retirement, tax, or investment advice. The 3.5% examples are scenarios, not a guarantee or official benefit notice.