Why was the 2027 Social Security COLA 3.6%?
The 2027 Social Security COLA was 3.6 percent because the number is a formula, not a decision. Legislation enacted in 1973 made Social Security raises automatic, and since 1983 each year's COLA has been the percentage rise in the average CPI-W for July, August and September over the third quarter of the last year in which a COLA took effect, rounded to a tenth of a percent, with no increase at all in a year the index does not rise. The 2026 COLA of 2.8 percent set the base. July's CPI-W came in 3.4 percent above a year earlier, August's index was 328.481, and September's 330.654 completed the three readings, so Social Security could announce the result on October 14: 3.6 percent, about $75 a month on the average retirement benefit, from January 2027. What pushes the other way is not the formula but what is deducted from the check, and what is left to pay from: the Medicare Part B premium rose almost 10 percent for 2026, and the trustees report the retirement trust fund runs dry in late 2032, after which they project about 78 percent of benefits would be payable without legislation.
Trace the chain
The formula
- 1The lawRegulatory
Legislation enacted in 1973 makes Social Security increases automatic cost-of-living adjustments
Until then every benefit increase was a separate act of Congress. The 1972 and 1973 Social Security amendments tied benefits to the Consumer Price Index instead, so that from 1975 the raise would follow measured inflation rather than a vote. The Social Security Act's section 215(i) still carries the formula.
Social Security Administration, Office of the Chief Actuary ·
Legislation enacted in 1973 provides for cost-of-living adjustments, or COLAs. With COLAs, Social Security and Supplemental Security Income (SSI) benefits keep pace with inflation.
Why it matters here. The 1973 legislation made COLAs automatic, while the formula in the next entry determines whether inflation produces an increase and by how much.
How the Social Security COLA Is Set: From the 1973 Law to the Third-Quarter CPI-W Formula
- 2The formulaRegulatory
COLAs move to December: the third-quarter CPI-W becomes the yardstick, announced each October
From 1983 the adjustment has applied to benefits payable for December, paid in January. Under the formula a COLA equals the percentage increase in the average CPI-W for the third quarter of the current year over the average for the third quarter of the last year in which a COLA took effect, rounded to the nearest tenth of a percent, with no COLA if the index did not rise. That is why the September CPI-W release each October settles the number.
Social Security Administration, Office of the Chief Actuary ·
A COLA effective for December of the current year is equal to the percentage increase (if any) in the CPI-W from the average for the third quarter of the current year to the average for the third quarter of the last…
Why it matters here. The third-quarter CPI-W formula means that the COLA in the next entry fixed the base quarter every reading of the following year is measured against.
How the Social Security COLA Is Set: From the 1973 Law to the Third-Quarter CPI-W Formula
The 2026 reading
- 3The baseAnnouncement
2026 COLA is 2.8%, about $56 a month; taxable maximum rises to $184,500
Benefits for 75 million people rose 2.8 percent from January 2026, the first COLA of the Bisignano era, with SSI increases from December 31. The agency noted the decade's average COLA had been about 3.1 percent, and asked people who wanted their COLA notice online only to opt out of paper by November 19. Much of the raise for Medicare enrollees would be absorbed by the Part B premium increase announced three weeks later.
Social Security Administration ·
The Social Security Administration (SSA) announced today that Social Security benefits, including Old-Age, Survivors, and Disability Insurance (OASDI), and Supplemental Security Income (SSI) payments for 75 million…
Why it matters here. The 2026 COLA precedes July, the first of the three CPI-W readings used to set the next adjustment.
Social Security's Next Raise: From the 2.5% COLA to the 2027 Announcement
- 4July CPI-WReport
July CPI-W at 3.4%: the Senior Citizens League trims its 2027 COLA forecast to 3.6%
With the first of the three months that set the COLA in hand, the Senior Citizens League lowered its projection from 3.8 to 3.6 percent, still the largest raise since 2023, worth about $70 a month on the average benefit; independent analyst Mary Johnson cut hers to 3.4 percent from 4.7 percent in June and AARP said 3.5 percent. Inflation had swung from 2.2 percent in January to 4.4 percent in May before easing, with oil prices about 24 percent above a year earlier.
The Senior Citizens League ·
TSCL predicts that Social Security’s 2027 Cost of Living Adjustment (COLA) will be 3.6 percent, which is 0.8 percentage points higher than this year’s COLA of 2.8%.
Why it matters here. July was the first of the three third-quarter CPI-W readings, so the next entry's August result supplied the second input to the annual average.
Social Security's Next Raise: From the 2.5% COLA to the 2027 Announcement
- 5August CPI-WReport
BLS reports an August CPI-W index of 328.481
The Consumer Price Index for Urban Wage Earners and Clerical Workers increased 3.5 percent over the 12 months to August, to an index level of 328.481 (1982-84=100). The Military Officers Association of America put the August reading 3.5 percent above the 317.265 COLA baseline.
U.S. Bureau of Labor Statistics ·
The Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W) increased 3.5 percent over the last 12 months to an index level of 328.481 (1982-84=100).
Why it matters here. August was the second of the three third-quarter readings, leaving only the next entry's September index before the formula could be applied.
Social Security's Next Raise: From the 2.5% COLA to the 2027 Announcement
- 6September CPI-WUpdate
BLS reports September CPI-W index of 330.654
The U.S. Bureau of Labor Statistics reported that the CPI-W rose 3.9 percent over the preceding 12 months. The September CPI-W index was 330.654 on a 1982–84=100 basis.
U.S. Bureau of Labor Statistics ·
The Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W) increased 3.9 percent over the last 12 months to an index level of 330.654 (1982-84=100).
Why it matters here. September's CPI-W index completed the third-quarter data used by the statutory formula, so SSA could announce the final 2027 adjustment in the next entry.
Social Security's Next Raise: From the 2.5% COLA to the 2027 Announcement
- 7Official 2027 COLAAnnouncement
The 2027 COLA is 3.6 percent, worth $75 a month to the average retiree
Social Security announced a 3.6 percent cost-of-living adjustment for 2027, which it said would raise the average retirement benefit by $75 a month. Nearly 72 million beneficiaries see it from January 2027 and about 7.3 million SSI recipients from 31 December 2026, 76 million people in all. The taxable maximum rises to $192,300 and the earnings limit for workers under full retirement age to $25,560. The figure follows the September CPI-W, released the same morning.
Social Security Administration ·
The Social Security Administration (SSA) today announced a 3.6 percent benefit increase for 2027.
Why it matters here. SSA's official 3.6 percent benefit increase provides the benchmark against which the next counter-entry shows how Medicare deductions can reduce what reaches a beneficiary's check.
Social Security's Next Raise: From the 2.5% COLA to the 2027 Announcement
What pushes back
- 8Medicare Part B
Medicare Part B premium for 2026 jumps almost 10% to $202.90, eating into the COLA
CMS set the standard Part B premium at $202.90 a month for 2026, up $17.90 from $185, with the deductible rising to $283, citing projected price changes and higher use of services. For a retiree on the average benefit the premium increase took roughly a third of the $56 COLA, because Part B premiums are deducted from Social Security checks.
Centers for Medicare & Medicaid Services ·
On November 14, 2025, the Centers for Medicare & Medicaid Services (CMS) released the 2026 premiums, deductibles, and coinsurance amounts for the Medicare Part A and Part B programs, and the 2026 Medicare Part D…
What it pushes against. The Part B premium is deducted from the same check and rose almost 10 percent for 2026, so whatever the COLA turns out to be, the net raise deposited is smaller.
Social Security's Next Raise: From the 2.5% COLA to the 2027 Announcement
- 9The trust fund
2026 trustees report: retirement fund depleted in late 2032, combined funds still 2034; 75-year gap widens 16%
The trustees moved the retirement fund's depletion to the fourth quarter of 2032, one quarter earlier, with 78 percent of benefits payable, and held the combined funds at 2034 with 83 percent payable. Reserves dropped $160 billion in 2025 to $2.56 trillion and the 75-year actuarial deficit grew from 3.82 to 4.42 percent of payroll, driven by lower fertility and immigration assumptions and the 2025 tax law. Bisignano called on lawmakers and the agency to work together. The Medicare trustees' report released the same day projected the 2027 Part B premium at $209.50.
Social Security Administration ·
The OASI Trust Fund reserves are projected to become depleted in the fourth quarter of 2032, with 78 percent of benefits payable at that time.
What it pushes against. The trustees report the retirement fund depleted in late 2032 with 78 percent of benefits payable, the ceiling any raise sits under without legislation.
Social Security's Next Raise: From the 2.5% COLA to the 2027 Announcement
Changes to this chain
- Proposal #218 rejected (catalyst:2026-10-14 via publish:fed-rate-path-2025-2026): Same catalyst as #217, which was applied. #217 also inserts the September CPI-W reading that completes the third-quarter average, the one step the settled COLA actually needs; #218 leaves it out.
- Settled: September CPI-W release and the official 2027 COLA announcement (2026-10-14)
- Proposal #217 accepted (catalyst:2026-10-14 via publish:social-security-2027-cola): question: Why was the 2027 Social Security COLA 3.6%?; alias: Why is the 2027 Social Security COLA expected to be about 3.5%?; answer: The 2027 Social Security COLA was 3.6 percent because the automatic statutory formula compares the average CPI-W for July, August and September with the average for the third quarter of the last year in which a COLA took effect, rounding the percentage change to one decimal place. The 2.8 percent COLA for 2026 was the last adjustment in effect before this comparison. BLS reported a September CPI-W index of 330.654, completing the third-quarter readings, and Social Security announced the 3.6 percent adjustment on October 14, saying it would add about $75 a month to the average retirement benefit. Medicare premiums can reduce the net amount in a beneficiary's check, and the trustees' separate projection that the retirement trust fund would be depleted in late 2032 does not change the COLA formula.; alias: What will the 2027 Social Security COLA be?; replace step 4: [cause] July CPI-W -> social-security-2027-cola#383: July was the first of the three third-quarter CPI-W readings, so the next entry's August result supplied the second input to the annual average.; remove step 5: Warsh's interim assessment is no longer needed to explain a COLA that has been officially set by the statutory CPI-W calculation.; remove step 6: The scheduled releases and expected announcement have passed and are superseded by the final CPI-W reading and official COLA.; replace step 8: [cause] Official 2027 COLA -> social-security-2027-cola#2146: SSA's official 3.6 percent benefit increase provides the benchmark against which the next counter-entry shows how Medicare deductions can reduce what reaches a beneficiary's check.; remove step 9: The competing pre-announcement projection is superseded by SSA's official result.; insert after 7: [cause] September CPI-W -> social-security-2027-cola#2153: September's CPI-W index completed the third-quarter data used by the statutory formula, so SSA could announce the final 2027 adjustment in the next entry.
- Proposal #18 accepted (verify:v5): why of step 3 -> The 2026 COLA precedes July, the first of the three CPI-W readings used to set the next adjustment.; why of step 7 -> The August CPI-W result added another reading before the next entry's 3.5 percent TSCL forecast.; why of step 8 -> TSCL forecast a 3.5 percent COLA, and the next entry records AARP's 3.6 percent projection based on August CPI figures.; why of step 9 -> AARP projected a 3.6 percent COLA based on August CPI figures; the next counter-entry shows that Part B deductions can reduce the net gain from any COLA.
- Proposal #12 rejected (verify:v3): Applied through the seed: step 1 no longer promises a raise, the beef step is out, AARP has its own sourced step, the formula wording in the answer is corrected
Timelines in this chain
- How the Social Security COLA Is Set: From the 1973 Law to the Third-Quarter CPI-W Formula
- Social Security's Next Raise: From the 2.5% COLA to the 2027 Announcement
- The Fed's Rate Path: From the 2024 Cuts to Warsh's First Meetings
A chain is written by the editor from entries already published on the timelines above, each of which was read against its source before publication. The chain changes when those entries do. Data and terms.