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2027 COLA Calculatorby plusbeauxjours

2027 Social Security COLA Calculator + $90 Medicare Rebate Checker

See your estimated January 2027 check after the cost-of-living raise and Medicare Part B premium. Free, no signup.

The official 2027 COLA will be announced Oct 14, 2026. Until then, figures use forecasts (3.4%–3.6%).

COLA calculator

The amount before Medicare is taken out. Find it on your 2026 COLA letter or in my Social Security.

2027 COLA (cost-of-living raise)
Is your Medicare Part B premium taken out of your Social Security check?

Standard premium projected by the 2026 Medicare Trustees Report. CMS has not announced it yet.

Used only to show your payment date.

Your January 2027 estimate

Enter your current monthly benefit to see your estimated 2027 raise and deposit.

First payment with the 2027 raise

Choose your birth day to see your date.

From the SSA 2027 payment schedule. Allow 3 mailing days before contacting SSA.

Getting the one-time $90 Medicare payment?

CMS says about 20.8 million Original Medicare Part B enrollees will get a one-time $90 payment around Oct 8, 2026. Members of Congress have questioned whether it is legal, and the timing could change. Check if you qualify →

How to use this calculator

  1. Enter your current monthly Social Security benefit before Medicare. It is the "before deductions" amount on your 2026 COLA notice or in your my Social Security account.
  2. Pick a 2027 COLA. Until SSA announces the real number on October 14, choose a forecast (3.4%–3.6%) or type your own.
  3. Tell us whether Medicare Part B is taken out of your check. The standard 2027 premium is pre-filled; if you pay an income-related premium (IRMAA), enter your own.
  4. Optionally choose the day of the month you were born to see when your first check with the raise arrives.

How the 2027 estimate is calculated

We follow Social Security's rounding rules from 20 CFR 404.313 (opens in a new tab) and POMS RS 00601.020 (opens in a new tab), and do all math in whole cents so there are no rounding surprises:

  1. New benefit = current benefit × (1 + COLA), rounded down to the next lower 10 cents.
  2. Subtract the Part B premium (if it is taken from your check).
  3. Round down to the next lower whole dollar. That is the amount deposited.

Your 2026 deposit is figured the same way using the 2026 standard premium of $202.90, so you can see how much more (or less) will actually land in your account.

Worked example

A $2,000.00 benefit with a 3.5% COLA becomes $2,070.00. Subtract the projected 2027 Part B premium of $209.50 and you get $1,860.50, which rounds down to a $1,860 deposit. In 2026 the same person receives $2,000.00 − $202.90 = $1,797.10, or $1,797. The net raise is $63 a month, even though the gross raise is $70, because the Part B premium also goes up.

Why your SSA letter may differ slightly

Social Security applies the COLA to your primary insurance amount (PIA), the benefit before any early retirement or other reductions, and then reapplies those reductions. Applying the COLA to the amount you receive is a close approximation, usually within a few cents and at most about $1. Tax withholding, Medicare Part D premiums and other deductions are not included. Your official COLA notice, usually available in my Social Security in late November or December, is the final word.

2027 COLA: forecasts vs. official figure

The COLA equals the increase in the average CPI-W for July, August and September 2026 over the same months of 2025 (average 317.265), rounded to the nearest 0.1%. For reference, the 2026 COLA was 2.8%.

2027 COLA estimates
Source2027 COLAStatus
CRFB3.4%Forecast
The Senior Citizens League (opens in a new tab)3.5%Forecast
AARP (opens in a new tab)3.6%Forecast

The September 2026 CPI comes out October 14, 2026 at 8:30 a.m. ET; SSA is expected to announce the COLA the same day.

Medicare Part B premium in 2027

The standard Part B premium is $202.90 a month in 2026. For 2027 the Medicare Trustees Report projects $209.50 Projected. CMS has not announced the real figure yet; it is expected in November. If the premium increase is larger than your COLA raise, the "hold-harmless" rule usually protects your net check, and the calculator will tell you.

When the first 2027 check arrives

The January 2027 payment is the first to include the 2027 COLA. Dates are from the SSA 2027 payment schedule (opens in a new tab).

Social Security payment dates with the 2027 COLA
If you…January 2027 payment
were born on the 1st–10thWednesday, January 13, 2027
were born on the 11th–20thWednesday, January 20, 2027
were born on the 21st–31stWednesday, January 27, 2027
started before May 1997, or get SS + SSIThursday, December 31, 2026
get SSI onlyThursday, December 31, 2026

Frequently asked questions

When will the official 2027 COLA be announced?

The Social Security Administration is expected to announce the 2027 COLA on October 14, 2026, the same day the September 2026 consumer price index (CPI) is released at 8:30 a.m. ET. Until then, this calculator uses independent forecasts of 3.4% to 3.6%.

How much will my Social Security check go up in 2027?

Forecasts range from 3.4% (CRFB) to 3.6% (AARP), with The Senior Citizens League at 3.5%. On a $2,000 monthly benefit, a 3.5% COLA adds $70 before Medicare. For comparison, the 2026 COLA was 2.8%.

How is the Social Security COLA calculated?

The COLA is the percentage increase in the average consumer price index for urban wage earners and clerical workers (CPI-W) for July, August and September, compared with the same three months of the last year a COLA was set. It is rounded to the nearest 0.1%. The 2025 third-quarter average, the base for 2027, was 317.265.

How much will Medicare Part B cost in 2027?

The 2027 premium has not been announced yet; it is expected in November 2026 (CMS has not confirmed a date). The 2026 Medicare Trustees Report projects $209.50 a month, up from $202.90 in 2026. People with higher incomes pay more (IRMAA).

Why is my estimate slightly different from my SSA letter?

Social Security applies the COLA to your primary insurance amount (PIA) before any early-retirement or other reductions, then rounds down to the dime. This calculator applies the COLA to the benefit you enter, so the result can differ by a few cents up to about $1. Deductions such as tax withholding or Medicare Part D are not included. Your SSA COLA notice, usually posted in my Social Security in late November or December, is the final word.

When will I get my first check with the 2027 COLA?

If you were born on the 1st–10th, Wednesday, January 13, 2027; 11th–20th, Wednesday, January 20, 2027; 21st–31st, Wednesday, January 27, 2027. If you started benefits before May 1997 or get both Social Security and SSI, your January payment arrives Thursday, December 31, 2026, because January 3 falls on a weekend. SSI payments with the new rate also arrive Thursday, December 31, 2026.

What is the Medicare "hold-harmless" rule?

For most people who have Part B taken out of their Social Security check, the yearly increase in the Part B premium cannot be larger than their COLA dollar increase, so the net check does not go down. It generally does not protect people who pay IRMAA or who are new to Part B, and it does not matter for people whose premium is paid by Medicaid. If the projected premium increase is bigger than your raise, the calculator shows a note.

Will this calculator update after the official numbers come out?

Yes. We update the COLA after the SSA announcement and the Part B premium after CMS announces it, and record each change with its date on the FAQ & sources page.

More answers, the full source list and our update log are on the FAQ & sources page. Last updated: .