Your Social Security deposit came in lower this year, right after you heard the Medicare Part B premium went up, and now you're wondering if that's even allowed. For most people it isn't. A rule called hold harmless keeps a rising Part B premium from shrinking your net Social Security check. If yours dropped anyway, you're probably in one of four groups the rule leaves out.
In This Guide
- Key Takeaways
- What the Hold Harmless Rule Actually Does
- How the Math Works in a COLA Year
- Who Hold Harmless Doesn't Protect
- What to Do If Your Check Went Down
- How the Groups Compare
- Frequently Asked Questions
- Learn More
What the Hold Harmless Rule Actually Does
Most people pay their Part B premium the easy way: it comes straight out of the monthly Social Security payment before the money ever hits the bank. So when the premium goes up, the natural worry is that your deposit will go down. Hold harmless is the rule that stops that from happening.
It comes from Section 1840(f) of the Social Security Act, and here's what it promises: for a protected beneficiary, a rise in the Part B premium cannot make your net Social Security benefit payment shrink from one year to the next.U.S. Social Security Administration. (n.d.). How the Hold Harmless Provision Protects Your Benefits — Social Security Administration (SSA blog). ssa.gov. Retrieved Jul 24, 2026, from https://www.ssa.gov/blog/en/posts/2020-11-30.html Your check either stays the same or goes up. It doesn't fall because Part B got more expensive.
The rule has one important condition built in. It only applies to people who have their Part B premium deducted from a Social Security benefit and were enrolled in both for the year in question.U.S. Social Security Administration. (n.d.). How the Hold Harmless Provision Protects Your Benefits — Social Security Administration (SSA blog). ssa.gov. Retrieved Jul 24, 2026, from https://www.ssa.gov/blog/en/posts/2020-11-30.html If there's no Social Security check for the premium to come out of, there's nothing for the rule to protect. That's the thread running through the four groups below.
How the Math Works in a COLA Year
The protection is tied to your Social Security cost-of-living adjustment, the annual raise that keeps benefits roughly even with inflation. In a year with a positive COLA, the dollar increase in your Part B premium can't be bigger than the dollar increase in your Social Security check.U.S. Social Security Administration. (n.d.). How the Hold Harmless Provision Protects Your Benefits — Social Security Administration (SSA blog). ssa.gov. Retrieved Jul 24, 2026, from https://www.ssa.gov/blog/en/posts/2020-11-30.html If the premium would rise more than your raise, hold harmless caps the premium increase so your net payment lands flat instead of dropping.
And in a year with no COLA at all? Then there's no raise to absorb the increase, so for the protected group the premium effectively can't go up beyond the prior year's level.U.S. Social Security Administration. (n.d.). How the Hold Harmless Provision Protects Your Benefits — Social Security Administration (SSA blog). ssa.gov. Retrieved Jul 24, 2026, from https://www.ssa.gov/blog/en/posts/2020-11-30.html The protection only does its job when a COLA exists and is large enough to cover the premium bump.
Who Hold Harmless Doesn't Protect
The rule covers most beneficiaries, but not everyone. The Centers for Medicare & Medicaid Services (CMS) names four groups that aren't subject to hold harmless, and any of them can be billed the full premium increase.U.S. Social Security Administration. (n.d.). How the Hold Harmless Provision Protects Your Benefits — Social Security Administration (SSA blog). ssa.gov. Retrieved Jul 24, 2026, from https://www.ssa.gov/blog/en/posts/2020-11-30.html If your check went down, this is where to look.
You Enrolled in Part B for the First Time This Year
Hold harmless compares this year's premium to last year's. If you're brand new to Part B, there's no prior-year premium to hold you at, so you pay the current standard rate.U.S. Social Security Administration. (n.d.). How the Hold Harmless Provision Protects Your Benefits — Social Security Administration (SSA blog). ssa.gov. Retrieved Jul 24, 2026, from https://www.ssa.gov/blog/en/posts/2020-11-30.html
You Pay the High-Income Surcharge (IRMAA)
If your income is high enough to trigger the income-related monthly adjustment amount, you're outside the protection.U.S. Social Security Administration. (n.d.). How the Hold Harmless Provision Protects Your Benefits — Social Security Administration (SSA blog). ssa.gov. Retrieved Jul 24, 2026, from https://www.ssa.gov/blog/en/posts/2020-11-30.html For 2026, IRMAA kicks in above $109,000 for a single filer or $218,000 for a joint filer, based on your 2024 tax return.Centers for Medicare & Medicaid Services. (2026). 2026 Medicare Parts A & B Premiums and Deductibles. cms.gov. Retrieved Jul 23, 2026, from https://www.cms.gov/newsroom/fact-sheets/2026-medicare-parts-b-premiums-deductibles
You're Not Collecting Social Security Yet
Some people sign up for Medicare at 65 but delay Social Security to grow a larger benefit later. With no Social Security check in play, Medicare bills you for Part B directly, and there's no deposit for hold harmless to guard.U.S. Social Security Administration. (n.d.). How the Hold Harmless Provision Protects Your Benefits — Social Security Administration (SSA blog). ssa.gov. Retrieved Jul 24, 2026, from https://www.ssa.gov/blog/en/posts/2020-11-30.html
Medicaid Pays Your Part B Premium
If you're a dual-eligible beneficiary, such as someone in the Qualified Medicare Beneficiary program, your state Medicaid program pays the premium through a Medicare Savings Program.U.S. Social Security Administration. (n.d.). How the Hold Harmless Provision Protects Your Benefits — Social Security Administration (SSA blog). ssa.gov. Retrieved Jul 24, 2026, from https://www.ssa.gov/blog/en/posts/2020-11-30.html The full increase can be billed, but Medicaid absorbs it, so your own Social Security check isn't the thing taking the hit.
What to Do If Your Check Went Down
Start by figuring out which bucket you're in. If you're new to Part B, paying IRMAA, not yet drawing Social Security, or a dual-eligible, a lower net check after a premium increase is expected, not a mistake, because hold harmless doesn't reach those four groups.U.S. Social Security Administration. (n.d.). How the Hold Harmless Provision Protects Your Benefits — Social Security Administration (SSA blog). ssa.gov. Retrieved Jul 24, 2026, from https://www.ssa.gov/blog/en/posts/2020-11-30.html
If none of those fit you and your deposit still dropped, hold harmless says the premium alone shouldn't have caused it, so something else changed. A new IRMAA determination based on a higher-income tax year, a change to a Part D drug plan premium you have withheld, or a tax-withholding election can all move the number. The Social Security Administration can walk you through your benefit statement line by line and tell you exactly what was deducted and why. Your annual Social Security COLA notice, mailed each December, also spells out next year's premium deduction before it takes effect.
How the Groups Compare
| Your situation | Protected by hold harmless? | What that means for you |
|---|---|---|
| Premium deducted from your Social Security check, enrolled last year, standard premium | Yes | A premium increase can't drop your net check in a COLA year |
| New to Part B this year | No | You pay the current standard premium |
| Pay IRMAA (higher income) | No | You can be billed the full increase |
| Not yet collecting Social Security | No | Medicare bills you directly; nothing to protect |
| Dual-eligible, Medicaid pays your premium | No | The state pays; your check isn't reduced anyway |
Frequently Asked Questions
Does hold harmless mean my Part B premium never goes up?
No. It caps how much your premium can rise in a given year to the dollar amount of your COLA, so your net check doesn't fall. In a year when your raise is bigger than the premium increase, you'll pay the full increase and still see a higher deposit. The protection is about your check not dropping, not about freezing your premium forever.
If I was protected last year, am I automatically protected this year?
Not automatically. Hold harmless is judged year by year, and it reaches you only if your Part B premium is deducted from a Social Security benefit and you were enrolled in both across the years being compared.U.S. Social Security Administration. (n.d.). How the Hold Harmless Provision Protects Your Benefits — Social Security Administration (SSA blog). ssa.gov. Retrieved Jul 24, 2026, from https://www.ssa.gov/blog/en/posts/2020-11-30.html If you cross into one of the four unprotected groups, by starting to owe IRMAA or by no longer having the premium withheld from a check, the protection stops applying even though it covered you in an earlier year.
I pay IRMAA. Am I protected at all?
No. People who pay the income-related surcharge are one of the four groups outside hold harmless, so you can be billed the full premium increase even in a COLA year. If your income has since dropped because of a life event like retirement, you can ask Social Security to reconsider the IRMAA determination.
Learn More
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The information on Brevy.com is for educational purposes only and is not a substitute for professional legal, financial, or medical advice. Rules vary by state and program and change frequently. Always verify with the relevant agency or a qualified professional. Brevy is not a law firm, financial advisor, or healthcare provider.