A Social Security rule called the hold harmless provision keeps a Medicare Part B premium increase from shrinking a benefit payment, but the Social Security Administration’s own explainer lists who falls outside it: people enrolling in Part B for the first time, people who pay an income-related monthly adjustment amount, dual eligibles whose premium Medicaid pays, and people whose premium is not deducted from their benefit. No 2027 Part B premium or cost-of-living adjustment has been published, so none of the four groups can yet see how much of an increase reaches them.
Two tools for an IRMAA surcharge: The Retirement Tax & Withdrawal Planner includes an IRMAA tier calculator and the IRMAA appeal route that runs through form SSA-44.
Open the IRMAA tier calculator and the SSA-44 route →
Two conditions come before the protection applies
Social Security’s explainer, posted November 30, 2020, defines the provision as a special rule that “protects your Social Security benefit payment from decreasing due to an increase in the Medicare Part B premium.” It attaches two conditions. A beneficiary must be receiving, or entitled to, Social Security benefits for November and December of the year in question, and the Part B premiums for December and January must be deducted from the monthly benefit.
The deduction condition is where the fourth excluded group comes from, as described below. The explainer does not frame the rule as a guarantee against any premium increase; its stated purpose is that the payment does not decrease.
Four groups the rule does not cover
The same SSA post names three exceptions outright. Protection does not apply to people enrolling in Part B for the first time, to anyone who pays an income-related monthly adjustment amount premium, or to dual eligibles who have their Part B premium paid by a state Medicaid agency. The fourth group follows from the deduction condition: a beneficiary whose premium is not deducted from the Social Security payment does not meet it.
The Social Security Administration is the named source for all four. Its post is a standing explainer rather than a 2027 announcement, and the dollar figures that follow are the 2026 amounts, since nothing for 2027 has been issued.
IRMAA payers carry the surcharge on top of the standard premium
The Centers for Medicare & Medicaid Services set the 2026 standard Part B premium at $202.90, up $17.90 from $185.00 in 2025. The same fact sheet, published November 14, 2025, lists the income-related add-on for 2026 at $81.20 a month for an individual filer with income of $109,001 to $137,000, rising to $487.00 a month at $500,000 and above. The total monthly premium for high-income beneficiaries runs from $284.10 to $689.90.
Because IRMAA payers sit outside the hold harmless rule, a Part B increase reaches them without the cap that applies to others. The CMS fact sheet does not mention hold harmless at all, and it carries no 2027 premium; the agency’s 2026 figures were published on November 14, 2025, and the 2027 announcement had not been issued as of October 2, 2026.
Direct bills and state-paid premiums fall outside by definition
Social Security’s Medicare premiums page says that when the premium exceeds the monthly Social Security payment, or when no monthly payment is received, a separate bill comes from another federal agency. A bill of that kind is not a deduction from the benefit, so the deduction condition is not met. The SSA explainer separately excludes dual eligibles whose Part B premium a state Medicaid agency pays.
Whether any protected beneficiary’s 2027 premium increase will be limited at all depends on two figures that do not yet exist: the 2027 cost-of-living adjustment and the 2027 premium. Neither had been published as of October 2, 2026.
IRMAA looks back two years, and a reduction runs through its own form
For the groups whose premium is set by income, the difficulty is the age of the data. Social Security’s Medicare premiums page says the income information is generally taken from a tax return filed two calendar years behind the premium year, for 2026 a return filed in 2025 for tax year 2024. A retiree whose income has fallen since then is still billed on the earlier number.
The same page lists life-changing events that can support a reduction, among them marriage, divorce, the death of a spouse and stopping work, and points to form SSA-44 to report such an event and request a lower IRMAA. It directs beneficiaries to call 1-800-772-1213 (TTY 1-800-325-0778) or visit a local Social Security office, and it lists no fee for doing so.
Filing the request is a direct step with Social Security, with no paid help required.
Documenting a drop in income for a Part B surcharge
The two-year lookback and the separate SSA-44 request are the practical gap that the hold harmless explainer leaves for people who pay IRMAA. A retiree whose income fell after the return on file was prepared still has to show which life-changing event applies and what changed.
The Retirement Tax & Withdrawal Planner covers the IRMAA appeal route (SSA-44) alongside a provisional-income calculator and the account withdrawal order, so the SSA-44 route and the income figures behind it sit side by side.
Map the SSA-44 route for a drop in income →
This article was drafted with AI assistance from the cited official sources and checked against them before publication.
David M. Keller is a finance writer based in Columbus, Ohio, covering personal finance and consumer-focused economic topics. He earned his degree in journalism from Ohio University and began his career reporting on local business and economic trends for a regional media outlet. Since then, he has contributed to a variety of online publications, focusing on clear, practical coverage of topics such as cost of living, debt, and everyday financial decision-making.
