Social Security’s Trump Bump-Fueled 2027 COLA Has a Hidden Catch, and It Could Erase Some (or All) of Your Raise

Social Security checks will rise 3.6% in 2027. That’s the largest raise since the 8.7% adjustment that took effect in 2023, and headlines have dubbed it the “Trump bump.” The raise itself comes from a fixed formula: it compares the average of a consumer price index (the one built around wage earners’ spending) for July, August, and September against the same months a year earlier.

Many retirees will see the catch when the deposit actually lands. One retiree summed it up after doing the math on next year’s increase: “$81 more, but $15 gone to Medicare instantly.” Medicare’s Part B premium comes out of the check before you ever see it, and how much of your raise survives depends on where your benefit and income fall.

Your Medicare Premium Gets Paid Before You Do

If you’re on Medicare and collecting Social Security, Part B (the part that covers doctor visits and outpatient care) is usually deducted straight from your benefit. In 2026, the standard premium is $202.90 a month, up from $185 in 2025. The annual deductible is $283.

Medicare hasn’t announced the 2027 premium yet. Until it does, nobody can say exactly how much of the 3.6% you’ll keep. What you can know now is which of three groups you fall into.

Who Keeps All, Some, or None of the Protection

A rule called hold harmless keeps a Part B premium increase from shrinking your net Social Security check below what it was the year before. It protects the check, though, while the raise itself can still shrink. Last year shows how that plays out.

1. Small benefits can lose the whole raise. The 2026 COLA was 2.8%, and the Part B premium rose $17.90. A retiree with a $600 benefit got a raise of $16.80, which is less than the premium increase. Hold harmless limited their premium increase at the size of the raise. Their check didn’t drop, but it didn’t grow either.
2. Most retirees keep part of it. On a $1,500 benefit, that same 2.8% raise worked out to $42. After the full premium increase, about $24.10 made it into the bank account. For scale, the average retired worker collected an estimated $2,071 a month after the 2026 COLA, so most people land here.
3. Higher earners get no protection. Hold harmless doesn’t cover anyone who pays the income-related monthly adjustment amount, a surcharge added to Part B and Part D (prescription drug) premiums. For 2026, it starts above $109,000 in modified adjusted gross income for single filers and above $218,000 for joint filers. These retirees pay the full premium increase plus any increase in their surcharge, and that can take a bigger bite out of the raise.

A 3.6% COLA on a $1,500 check is $54 a month before Medicare takes its share. A bigger raise gives the premium more room to grow without wiping out the increase. It could still take a large piece.

A Two-Year-Old Tax Return Can Set Your 2027 Premium

The surcharge is where your other retirement decisions come back into the picture. Social Security figures it from your tax return from two years earlier. So a 2025 Roth conversion, home sale, or large IRA withdrawal can push your 2027 Medicare costs higher, even if your income has dropped back down since.

The thresholds work like cliffs. Going $1 over a tier can trigger the full surcharge for that tier. If your income is near a threshold, timing withdrawals or spreading a conversion across several years can keep you on the lower side (we mapped the surcharge tiers and the other premium traps retirees regularly trip into in a free Medicare guide). That kind of planning often saves more than the COLA adds.

Three Moves Before the New Deposit Arrives

First, read your annual COLA notice once Medicare sets the 2027 premium. It shows your new gross benefit, your Medicare deductions, and your actual net payment. Budget around that net number.

Second, if you’re within striking distance of a surcharge threshold, check your projected income before making any year-end withdrawals or conversions. A decision you make in late 2026 shows up in your 2028 premiums.

If your income has dropped since that two-year-old return, you can also ask to have the surcharge reduced. Social Security accepts requests on Form SSA-44 after a eligible life-changing event like retirement, cutting back on work, marriage, divorce, or the death of a spouse. Lots of new retirees pay a surcharge based on their last full year of salary without knowing they can challenge it.

Your own numbers will depend on your benefit, your filing status, and how you’re enrolled in Medicare. Run them against your notice before you count on the full 3.6%.

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