The Social Security Administration announced a 3.6% cost-of-living adjustment (COLA) for 2027 on October 14, 2026. The increase will raise Social Security benefits, but the amount that lands in your pocket can also depend on Medicare Part B premiums and, for some people, an income-related surcharge.
That’s why it helps to look beyond the percentage. Your COLA may increase your Social Security benefit, while Medicare costs may also change, and the timing and rules for those changes are not the same.
What the COLA means for your monthly check
A COLA adjusts Social Security benefits to account for changes in living costs. The announced 3.6% adjustment applies to Social Security benefits for 2027.
But a larger benefit amount does not automatically mean your take-home check will rise by the same amount. If your Medicare Part B premium is deducted from your Social Security payment, a change in that premium may affect the amount you receive after the deduction.
How the “hold harmless” protection works
The hold harmless provision is intended to protect most people who receive Social Security and have their Medicare Part B premium deducted from their benefit. In plain English, for people who qualify, a Part B premium increase cannot be greater than their COLA increase in a way that reduces their net Social Security check because of that Part B increase.
That protection can soften the effect of a higher Part B premium. It does not mean every person’s check will rise by exactly 3.6%, or that no other deduction or change can affect the amount deposited.
It also does not apply to everyone. Your Social Security status, how you pay your Part B premium, and whether you pay an income-related surcharge can all matter.
Who may not get the same protection?
You pay Part B directly and haven’t claimed Social Security. If you are enrolled in Part B but are not receiving Social Security benefits, there is no COLA increase to offset a change in your premium. You generally pay the full Part B cost directly, so watch for the official premium information when it is released.
You pay IRMAA. IRMAA is the income-related monthly adjustment amount (a surcharge added to Medicare premiums for some higher-income beneficiaries). It is calculated separately from the standard Part B premium, so a surcharge may change independently of your COLA. The hold harmless provision does not provide the same protection from IRMAA increases.
You are newly enrolling in Part B. People enrolling in Part B for the first time in the coming year may not qualify for hold harmless protection in the same way as someone whose premium was already deducted from a Social Security payment. If you are approaching Medicare enrollment, check your premium and payment arrangements rather than assuming the COLA will limit what you owe.
Your state Medicaid program pays your Part B premium. When a state program covers your Part B premium, the state absorbs the premium change. Your situation is different from someone who has the premium deducted from a Social Security check, so ask the state program or benefits administrator how any change affects your coverage and costs.
Why IRMAA can catch people by surprise
IRMAA is based on income, and Medicare generally uses tax information from two years earlier to determine the surcharge for a given year. That means a financial event from the past can affect what you pay now, even if your income has since changed.
For example, selling a business, receiving a large capital gain, or taking a sizable withdrawal from an individual retirement account (IRA) could move you into a higher income tier for a year. This is one reason people sometimes see a Medicare premium that feels out of step with their current finances.
2027 Part B and IRMAA figures are not final yet
As of October 17, 2026, CMS has not finalized the official 2027 standard Part B premium or IRMAA brackets. CMS is expected to announce the final figures later this fall.
Some available estimates point to a projected standard Part B premium of $209.50 per month. That is a projection, not an official 2027 premium, and not a figure to use as a final estimate of your own costs.
Similarly, some estimates suggest the first IRMAA income threshold could be projected to rise to $112,000 for an individual or $224,000 for a married couple filing jointly. These are projected thresholds, not finalized 2027 brackets. CMS has not confirmed them.
The useful takeaway is the mechanism: your COLA can increase your benefit, your standard Part B premium may change, and an IRMAA surcharge may apply separately based on income. The projected figures can help you understand what is being discussed, but only the final CMS announcement can tell you the official 2027 amounts.
What to do when the official figures are published
When CMS releases the final 2027 Part B premium and IRMAA brackets, compare those official figures with your own situation before drawing conclusions about your check.
You can review updates through Medicare.gov, sign in to your my Social Security account, or call 1-800-MEDICARE. For the COLA announcement itself, see the Social Security Administration’s 2027 release.
If you receive a notice about your benefit or premium, check whether it lists your gross Social Security benefit, the Part B deduction, and any income-related adjustment. Looking at the separate pieces can make it easier to understand why your net deposit may differ from the headline COLA percentage.
Still working past 65? Check your employer coverage rules
If you are still working past 65 and covered by an employer group health plan, Medicare Part B enrollment timing and coordination may work differently. The details depend on your employment and plan situation, so don’t assume that the COLA or a premium change answers whether you should enroll now.
For more on that decision, read our guide, “Do You Really Need Medicare Part B While Still Working? The Truth About Coordination Rules”.
Get help understanding what the changes mean for you
A COLA is welcome news, but your personal outcome depends on more than the percentage. Your Part B payment method, possible IRMAA, and other coverage details can all shape what you actually receive or pay.
Total Benefit Solutions offers free advocacy at no cost to you to help walk through what the COLA and Part B changes may mean for your specific situation. Call (215) 355-2121 or visit www.totalbenefits.net to talk through your questions and next steps.
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