If you or a parent lives on Social Security, the number that matters most each year isn't the stock market — it's the cost-of-living adjustment. And the 2027 estimate just got interesting, because it moved down on genuinely good inflation news. Let me translate the percentage into what actually lands in a bank account.
Key Takeaways
- The 2027 COLA is estimated at 3.6% (AARP) to 3.8% (The Senior Citizens League) as of mid-July 2026, with independent analyst Mary Johnson at 3.7%.
- At 3.8%, the average benefit rises about $73.62 a month — from $1,937.53 to $2,011.15.
- The official number comes in October 2026, based on July–September CPI-W.
- A Medicare Part B premium increase can quietly eat part of the raise.
- A bigger COLA also nudges a key trust fund's insolvency date slightly closer, per CRFB.
The number, and who says what
Three trackers have weighed in as of mid-July 2026, all pointing the same direction but landing on slightly different numbers:
| Source | 2027 COLA estimate | As of |
|---|---|---|
| The Senior Citizens League (TSCL) | 3.8% | July 14, 2026 |
| AARP | 3.6% | July 2026 |
| Mary Johnson (independent analyst) | 3.7% | July 2026 (down from 4.7% the month before) |
| Actual 2026 COLA (for comparison) | 2.8% | January 2026 |
The estimates cooled from spring highs — some had reached 4.2%–4.7% — because June's CPI-W came in softer than expected. This is a rare case where lower inflation is a mixed blessing: better for your grocery bill, but it shrinks next year's raise.
How the number actually gets calculated
None of these estimates are guesses in the "vibes" sense — they're forecasts of a specific, mechanical formula the SSA has used since 1975:
How the number actually gets set
From CPI-W to your check, in 5 steps
CPI-W collected for Jul, Aug, Sep
The Bureau of Labor Statistics measures inflation for wage earners over the third quarter
Averaged and compared to the prior year
This year’s Q3 average vs. last year’s Q3 average
The % increase becomes the COLA
Rounded to the nearest 0.1% — this is the only input, by law
SSA announces the official number
Always in October, for the following January
Applied to benefits starting January
Automatic — no application needed
Every estimate you see before October — 3.6%, 3.7%, 3.8% — is a forecast of step 3, made before steps 1–2 are even complete for Aug/Sep.
What 3.8% is worth in dollars
Percentages are abstract; dollars aren't. Per TSCL's July 14 estimate, if a 3.8% COLA took effect today, the average retirement benefit would rise $73.62 a month, from $1,937.53 to $2,011.15.
Interactive · estimate your 2027 raise
What your COLA is actually worth
2027 COLA scenario
At a 3.8% COLA, your benefit would rise to $0.00/mo — a raise of $73.63/mo, or $0.00/mo net of the Medicare Part B increase you set above.
Illustrative only — the SSA doesn't announce the official 2027 COLA until October 2026, and the 2027 Medicare Part B premium isn't finalized until around November 2026. Not financial advice.
Why this number carries so much weight
This isn't a rounding error for most recipients. Per Congressional Research Service data cited by AARP and SSA reliance studies, most beneficiaries lean on Social Security for a large share of their household income:
Three in five beneficiaries get at least half their income from that check, and roughly one in seven get nearly all of it. That's why a 0.2-point swing in the estimate — 3.6% vs. 3.8% — isn't academic: for the 90%+ group in particular, it's close to their entire raise for the year, full stop.
The Medicare Part B catch
Here's the part the headline number hides. For most retirees, the Medicare Part B premium is deducted straight from the Social Security check. The 2026 Medicare Trustees Report projects the standard 2027 Part B premium at around $209.50/month, up from $202.90 in 2026 — a projection, not a final number. CMS doesn't announce the actual 2027 premium until around November 2026, and past projections have missed (the 2022 premium, for example, was projected at $158.50 but finalized at $170.10).
Don't budget the full 3.8%. Budget the raise minus your expected Medicare premium increase. For lower benefit amounts, the Part B bump can eat a meaningful slice of the COLA — and the real number won't be locked in until November.
The uncomfortable trade-off
A larger COLA helps recipients now but strains the system. The nonpartisan Committee for a Responsible Federal Budget (CRFB) estimated in May that a 3.8% COLA in 2027 would add roughly $300 billion to Social Security's fiscal shortfall over the next decade and advance a key trust fund's projected depletion date by about three months, from late 2032. CRFB separately estimates that hitting that insolvency date without Congressional action would force an automatic ~25% across-the-board benefit cut. That's not a reason to root against your own raise — but it's the honest context.
Here's What I'd Actually Do
- Treat the estimate as a range, not a promise. Plan around 3.6%–3.7%, and treat anything higher as upside. The official number is October.
- Net out Medicare. Calculate raise minus expected Part B increase for your real spendable change — and don't assume $209.50 is locked in.
- If you're not yet claiming, don't let COLA math rush you. Delaying benefits still raises your base far more than any single year's COLA.
- Revisit your withdrawal rate. A higher COLA slightly reduces how much you must pull from savings — recalculate once the official number lands.
Planning retirement accounts alongside Social Security? See Roth IRA vs Traditional IRA and Trump Account vs 529 Plan for the tax side of the picture.
Frequently Asked Questions
Sources & References
- 1.Congress Reintroduces Social Security 2100 Act as This Year's COLA Projection Holds at 3.8% — The Senior Citizens League, 2026-07-14
- 2.Social Security COLA Preview: Will 2027 Benefits Go Up? — AARP, 2026-07-14
- 3.A Higher 2027 Social Security Raise Could Add $300 Billion to the Program's Shortfall — AOL / CRFB analysis, 2026-07
- 4.Social Security recipients could get a nearly 4% cost-of-living adjustment, forecasters say — CBS News, 2026-07-14
- 5.Medicare's 2027 Part B Premium Is Projected to Push Past $215 a Month — 24/7 Wall St. (citing 2026 Medicare Trustees Report), 2026-07-07
- 6.Consumer Price Index Summary — June 2026 (CPI-W basis) — U.S. Bureau of Labor Statistics, 2026-07-14
- 7.Income from Social Security — Pension Rights Center (citing CRS/SSA reliance data), 2026