US Social Security COLA 2028 Projection Calculator

The Social Security COLA projection calculator is a free, browser-based tool that estimates what your monthly benefit will be in 2028 by applying a projected cost-of-living adjustment to the amount you receive today. Enter your current benefit and a COLA assumption, and it returns your new monthly and annual totals. For reference, the 2026 COLA was 2.8%.

The Cost-of-Living Adjustment is announced each October by the Social Security Administration, based on the change in CPI-W from the third quarter of the previous year to the third quarter of the announcement year. It takes effect the following January. Recent adjustments: 2026 was 2.8% (announced 24 October 2025, worth about $56 a month to the average retiree), 2025 was 2.5%, 2024 was 3.2% and 2023 was 8.7%. Over the last decade the COLA has averaged roughly 3.1%, which is a more sensible starting assumption than either the 8.7% spike or a low outlier year. The 2028 figure will be announced around October 2027. Source: SSA — 2026 COLA announcement.

When the 2027 COLA Will Be Announced

Before 2028 comes into view there is a nearer date that matters: the 2027 COLA is announced in October 2026, and it is calculated from the change in CPI-W between the third quarter of 2025 and the third quarter of 2026 — July, August and September figures, published by the Bureau of Labor Statistics. Those months are being measured right now, which is why projections firm up sharply through the autumn and why any 2028 number is necessarily a rougher estimate: it depends on a CPI-W window that has not started yet. Treat a 2028 projection as a planning range rather than a figure to budget to the dollar, and re-run it once the 2027 COLA is confirmed. If CPI-W falls year over year the adjustment is floored at 0% — benefits are never reduced by a negative COLA.

How COLA Is Calculated

Formula: ((Q3 average CPI-W current year - Q3 average prior year) / Q3 prior year) × 100. CPI-W = Consumer Price Index for Urban Wage Earners and Clerical Workers (subset of CPI-U). BLS publishes monthly; SSA averages Jul-Sep. If sum is negative, COLA = 0%.

What COLA Applies To

Retirement benefits, disability (SSDI), survivors, SSI federal rate. NOT applied to Medicare premiums or Part D — those have their own adjustments. COLA also adjusts taxable wage base (2025: $168,600 → 2026: ~$175K projected) and quarter-of-coverage threshold.

2028 COLA Projection

Trustees' Report projects 2.4-2.7% long-term COLAs. Current Fed inflation target 2%. Recent: 2026 = 2.5%, 2027 projected 2.7-3.0%. 2028 likely 2.5-3.0% absent major inflation shock. Energy, food, and rent components drive variance.

Why a 2028 COLA Projection Moves Every Month

A 2028 projection is not a forecast of inflation in 2028. It is an estimate of what the CPI-W index will read in the third quarter of 2027 compared with the third quarter of 2026, because that single quarterly comparison is the entire formula. Two things follow. First, the number moves as each monthly CPI-W release lands: an estimate published in the spring is built almost entirely on assumption, and it tightens month by month as real July, August and September readings replace guesses. Second, inflation outside that window does not reach the figure at all — a sharp price rise in February that has cooled by July never appears in the adjustment, which is why a year that felt expensive can still produce a modest COLA. Treat any 2028 number you see now, including the one you calculate here, as a planning range rather than a figure to budget against, and re-run it after each CPI-W release. The 2027 adjustment is announced first, in October 2026, and it also raises the base your 2028 percentage will be applied to. Source: U.S. Bureau of Labor Statistics — Consumer Price Index. Updated 2026-09-18.

Tax Impact of COLA

Higher SS benefit may push more into provisional income brackets (50% or 85% of benefit taxed). Federal max SS taxation = 85%. State varies — 13 states tax SS to some degree. Plan QCDs or tax-loss harvesting in COLA years to offset.

Social Security COLA History and the 2028 Projection Range

The most useful input for a 2028 projection is the actual run of past adjustments, because it shows how wide the realistic range is. Announced COLAs, per the SSA cost-of-living adjustment record:

• 2026 — 2.8% (announced 24 October 2025)
• 2025 — 2.5% · 2024 — 3.2% · 2023 — 8.7% (the post-pandemic inflation spike)
• 2022 — 5.9% · 2021 — 1.3% · 2020 — 1.6% · 2019 — 2.8%
• 2018 — 2.0% · 2017 — 0.3% · 2016 — 0.0% (no adjustment at all)

Two things fall out of that list. First, the ten-year mean is roughly 3.1%, which is the default this calculator suggests. Second, the spread runs from 0.0% to 8.7%, so a single-number 2028 forecast is false precision. Run three scenarios instead. On a $2,000 monthly benefit: a 2.0% COLA adds $40 a month ($480 a year), 3.0% adds $60 ($720 a year), and 4.0% adds $80 ($960 a year). Budget to the low case and treat anything above it as headroom, because the CPI-W window that sets the 2028 figure does not open until July 2027.

Last updated September 2026. Sources: SSA Cost-of-Living Adjustment, BLS CPI-W Data.