Social Security COLA Calculator

Project Social Security benefit growth with COLA over 5, 10, and 20 years.

By Konstantin Iakovlev · Updated September 2026 · Source: SSA — 2026 COLA Fact Sheet

$
%

In 10 Years

$2,455.99/mo

In 20 Years

$3,174.69/mo

COLA Projections

In 5 years$2,160.18/mo ($25,922.19/yr)
In 10 years$2,455.99/mo ($29,471.92/yr)
In 15 years$2,792.31/mo ($33,507.75/yr)
In 20 years$3,174.69/mo ($38,096.24/yr)

Use the Social Security COLA Calculator above to calculate your results. Enter your values and see instant results — all calculations run in your browser.

Disclaimer: This calculator is for informational purposes only and does not constitute tax, financial, or legal advice. Results are estimates based on the information you provide and current rates. Always consult a qualified tax professional or financial advisor for advice specific to your situation.

How It Works

Inflation steadily chips away at fixed income, and Cost-of-Living Adjustments (COLAs) are how Social Security tries to keep pace. This tool projects where your benefit could land across 5, 10, 15 and 20 year horizons once those adjustments compound. The 2026 COLA came in at 2.8% (announced by the SSA on October 24, 2025), while the years beyond it are unknowable in advance — so projections lean on an assumed average, which you can set yourself.

Projection happens year by year. Starting from your current monthly benefit, the tool applies an assumed annual COLA percentage, then repeats the step for each following year using the formula New Benefit = Old Benefit * (1 + COLA Percentage). Stacking those yearly bumps reveals the cumulative effect over whatever time horizon you pick.

Treat every COLA figure here as an estimate; real adjustments swing year to year with the inflation data behind them. These numbers serve long-range planning far better than any immediate financial decision. People routinely underestimate how much even a fraction of a percentage point compounds once it runs across a couple of decades.

Example: Projecting Benefits for a Current Retiree

  1. 1 Input: a current benefit of $1,900 a month and an assumed COLA of 2.6% a year, the calculator's defaults.
  2. 2 Why 2.6%: the 20 COLAs paid from January 2007 through January 2026 averaged about 2.55% a year. The average of every COLA since 1975 is higher, about 3.7%, because of the high-inflation years around 1980, when the adjustments reached 14.3% and 11.2%.
  3. 3 Result: $1,900 × 1.026^5 = $2,160 a month after 5 years, $2,456 after 10, $2,792 after 15 and $3,175 after 20, or $38,096 a year.
  4. 4 Each COLA only matches the rise in the CPI-W, so the larger checks buy roughly what $1,900 buys today. The projection shows the dollar amounts you would receive, not a gain in purchasing power.

Source: SSA — 2026 COLA Fact Sheet · Last updated: September 2026

Frequently Asked Questions

How is the Social Security COLA calculated?
COLA is based on the percentage increase in the Consumer Price Index for Urban Wage Earners (CPI-W) from the third quarter of one year to the third quarter of the next. If there is no increase, there is no COLA.
When does the Social Security COLA take effect?
The COLA is announced in October and takes effect in January of the following year. The increase first appears in the benefit payment you receive in January.
Has Social Security COLA kept up with actual inflation?
Not always. CPI-W may underweight healthcare and housing costs that disproportionately affect retirees. Some advocacy groups push for using CPI-E, an experimental index for the elderly that typically shows higher inflation.

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