US Social Security COLA Calculator: Benefit Increase After the Adjustment
Work out the cost-of-living adjustment (COLA) on a US Social Security benefit — the percentage increase and the monthly dollar rise — when the annual COLA takes effect.
Adjust the inputs and select Calculate for a full breakdown.
Compare Common Scenarios
How the numbers shift across typical situations for this calculator:
| Scenario | COLA | Monthly increase |
|---|---|---|
| $2,000 to $2,064 (3.2% COLA) | 3.20% | 64 |
| $1,800 to $1,857.60 (3.2%) | 3.20% | 57.6 |
| $2,500 to $2,712.50 (8.5% high-inflation year) | 8.50% | 212.5 |
| $2,000 to $2,026 (1.3% low-inflation year) | 1.30% | 26 |
How This Calculator Works
Enter your current monthly benefit and your new benefit after the COLA. The calculator finds the percentage adjustment and the monthly dollar increase. Multiply the monthly increase by 12 to see the annual difference. To work out a new benefit from a known COLA percentage, multiply your current benefit by (1 + COLA%).
The Formula
Percentage Change
Old is the starting value, New is the ending value
Worked Example
A benefit rising from $2,000 to $2,064 a month is a 3.2% COLA — $64 more a month, or $768 a year. The Social Security COLA is the annual cost-of-living adjustment the Social Security Administration applies to benefits to keep pace with inflation. It's based on the change in a specific inflation index (the CPI-W) measured over a set period, announced each autumn, and applied to benefits starting in January. The COLA also generally applies to SSI payments.
Key Insight
The Social Security COLA is one of the most-watched annual numbers for retirees, and a few details affect what you actually see. The adjustment is tied to inflation — specifically the change in the CPI-W (Consumer Price Index for Urban Wage Earners and Clerical Workers) from the third quarter of one year to the next — so a high-inflation year produces a larger COLA and a low-inflation year a small one (or, rarely, zero, since the COLA can't be negative). The Social Security Administration announces it in October and applies it to benefits beginning the following January. The important catch this calculation doesn't show: the Medicare Part B premium is usually deducted directly from Social Security benefits, and if that premium rises (as it often does), it can offset part — occasionally most — of the COLA, so the net increase a beneficiary sees in their deposit can be smaller than the gross COLA suggests. There's also a 'hold harmless' provision that protects most beneficiaries from a Part B premium increase exceeding their COLA in dollar terms. For planning, the COLA helps benefits keep up with inflation, but because the CPI-W weights spending differently than seniors' actual costs (especially healthcare), some argue it understates retirees' true inflation. This calculator shows the gross COLA percentage and monthly increase; to estimate your real take-home change, subtract any rise in your Medicare Part B premium from the COLA increase. Use it to translate a known benefit before-and-after into the adjustment, or apply a published COLA percentage to your current benefit to project the new amount.
Frequently Asked Questions
How is the Social Security COLA calculated here?
Subtract your old monthly benefit from the new one, divide by the old benefit, and multiply by 100. From $2,000 to $2,064 is a 3.2% COLA — $64 more a month ($768 a year). To project a new benefit from a known COLA, multiply your current benefit by (1 + COLA%).
What determines the Social Security COLA?
It's tied to inflation — specifically the change in the CPI-W (a wage-earner consumer price index) from the third quarter of one year to the next. A high-inflation year produces a larger COLA; a low-inflation year a small one. The COLA can't be negative, so benefits never drop due to it.
When is the COLA announced and applied?
The Social Security Administration announces the COLA in October each year, and it's applied to benefits starting the following January. It generally also applies to SSI payments. So the figure you hear in autumn shows up in your benefit deposits the next year.
Why might my actual increase be smaller than the COLA?
Because the Medicare Part B premium is usually deducted from your Social Security benefit, and if that premium rises it offsets part of the COLA — sometimes most of it. So the net increase in your deposit can be smaller than the gross COLA. A 'hold harmless' rule protects most beneficiaries from a Part B rise exceeding their COLA in dollars.
Does the COLA fully keep up with retirees' costs?
It's designed to track inflation via the CPI-W, but that index weights spending differently than many seniors' actual costs — particularly healthcare, which seniors use more. Some argue this understates retirees' true inflation, so even with the COLA, purchasing power can erode over time relative to a retiree's real cost of living.
Related Calculators
Methodology & Review
The adjustment is the change between the new and old monthly benefit divided by the old benefit, multiplied by 100. It compares your benefit before and after the COLA; it does not account for the Medicare Part B premium typically deducted from the benefit, which can offset part of the increase.
Written by Ugo Candido · Last updated May 22, 2026.