The 2026 Social Security COLA: What It Really Covers After Medicare

The January deposit hits and the alert says $1,912, which is $12 more than December, and then the COLA letter in the drawer names a percentage that looks like it should have moved the check by four times that.

You do the multiplication against your own benefit before you even finish the sentence, and the number you get is not the number that landed. Nothing was taken from you and nobody made a mistake. The percentage in that letter attaches to your gross benefit, the figure printed before a single deduction comes off, and Medicare Part B is pulled from that same check in that same month. Both changes arrive at once, on one deposit.

The raise that actually matters is the dollar COLA minus the dollar change in the premium. That difference is the only figure worth building a month around.

Three numbers get you there: your gross benefit, the official 2026 COLA, and the official Part B premium. Pull them, check whether IRMAA or the hold-harmless rule bends the result, and you will know what January brings before January does.

The COLA adjusts your gross benefit

The percentage you see in the announcement lands on the gross monthly benefit, the line printed on your benefit statement before a single deduction comes off.

That word gross is doing real work here. It is the figure Social Security says you are entitled to each month, not the figure your bank sees. The two are different numbers on the same statement, and the COLA only ever touches the first one. So when the announcement says benefits rise by some percent, it means the top line rises. What happens at the bottom is a separate calculation that arrives later.

To get your own dollar amount, take that gross figure and multiply it by whatever percentage SSA.gov posts. The catch is timing: they announce the number once a year, usually in the fall, so you cannot run the multiplication until it is actually out. Pull up your statement, find the gross line, and wait for the announcement before you do anything with it.

At the illustrative $1,900 gross benefit, a COLA moves the $1,900. The deposit line moves only once the Part B premium for that same year is subtracted from it.

This is why the announced number and the deposited number disagree so often, and it is the split worth holding onto: the headline figure is real, it just describes a number you never receive whole.

How Medicare Part B comes out of the check

Medicare Part B comes out automatically. If you are enrolled and receiving Social Security, the premium is deducted from your monthly benefit before the payment ever reaches your account, so the deposit you see is already net of it. You did not sign a separate bill; the subtraction happens inside the check.

The 2026 Part B premium is set by CMS and published on Medicare.gov. No premium figure gets quoted here, because a number from anywhere else is a guess, and a guess is worse than a blank you fill in yourself.

The order of operations inside that deposit runs one way only: gross benefit adjusted by the COLA, minus the Part B premium, equals the net payment. The deduction is taken before the net is calculated, not tacked on afterward. That ordering is the whole reason the announced figure and the deposited figure part ways.

Your my Social Security statement shows the gross benefit line and the deduction line as separate entries. Those two figures side by side are what you need, and they are the only ones on the page that describe your situation rather than someone else's.

Part D adds a third subtraction when you have chosen to have that premium withheld from the same check. The amount varies by plan, so it does not appear in any COLA announcement, but it comes out of the same deposit all the same.

Why your net raise is smaller than the COLA

Two changes hit one deposit: the COLA adds dollars at the top, the premium takes dollars before the bottom. Net them in dollars, never in percentages, and the smaller check stops being a mystery.

The formula is net change equals (gross benefit times COLA) minus (new Part B premium minus current Part B premium). Run it with placeholders and the shape appears. At $1,900 gross and a placeholder 2.8% COLA, the dollar COLA is $53.20. A placeholder $12.00 premium increase leaves $41.20 of net change.

Now flip the placeholder to something bigger than the COLA. At $1,900 and a placeholder 2.5%, the dollar COLA is $47.50. Against a placeholder $53.00 premium increase, that is a net of minus $5.50, and the check holds flat rather than dropping only where the hold-harmless rule reaches you.

Both sets of placeholders stand in only until you substitute the official figures from SSA.gov and Medicare.gov. The point is not the specific dollars; it is that the subtraction, not the percentage, answers your budgeting question.

Part D withholding, if you chose it, adds to the subtraction and shrinks the net further, and it never shows up in the COLA letter. The percentage in that letter varies person to person even under an identical COLA, which is exactly why the dollar difference between the two changes is the number worth writing down.

IRMAA can raise your Part B premium

The premium you subtract is not the same premium your neighbor subtracts. IRMAA – the income-related monthly adjustment amount – is a surcharge stacked on top of the standard Part B premium, and separately on top of whatever you pay for Part D. It does not replace the standard premium. It gets added to it.

The trigger is your modified adjusted gross income, and here is the part that catches people: it is the figure from the tax return you filed two years earlier. So the MAGI that sets your 2026 surcharge lives on the return you filed in 2024. If that was an unusually big income year, you may still be paying for it now.

One Roth conversion. One IRA withdrawal you took to cover a roof. One house sold. Any of those can push a single year's MAGI past a threshold, and both Part B and Part D pick up a surcharge that comes straight out of the same Social Security check, before anything reaches your account.

That surcharge can be larger than your dollar COLA on its own. Suppose your COLA adds $48 a month and the IRMAA surcharge adds $70 – the net is negative, and no rule softens it. IRMAA sits outside hold-harmless protection, so every dollar of it comes out even where the rest of the check is shielded from a decrease.

Pull the return you filed two years ago and find your MAGI. Compare it to the threshold table on Medicare.gov, which is where the current brackets live. If your income has dropped since that return – you retired, you stopped consulting, the one-time sale is behind you – Medicare.gov also publishes a reconsideration process, and that is how you ask them to use the newer figure instead.

The subtraction itself does not change. What changes is what you subtract, and for some readers it is a bigger number than they ever expected.

The hold-harmless rule, and who it misses

When the premium climbs more than your COLA, your check stops falling at zero – that is the whole job of the hold-harmless rule, and it only applies if you qualify. It is a floor, nothing more.

It protects against a decline in your net benefit caused by a higher Part B premium, for beneficiaries who meet the conditions. It does not build you a raise. If your dollar COLA is $40 and the premium rise is $55, a protected check holds level; it does not climb $15 to make you whole.

Three groups get no floor at all. If you are newly enrolling in Part B for the year, the protection does not cover that year's increase – someone who signed up during 2025 enters 2026 without it. If IRMAA applies to you, the surcharge is deducted in full regardless. And if your premium is not withheld from Social Security – you are billed directly, or you are on a Medicare Advantage or other arrangement where it works differently – there is no net check to hold harmless.

For the rest, the rule is a ceiling on the damage, not a cushion underneath it. Your benefit holds where it was; your costs do not go back down.

SSA.gov states the exact conditions and exceptions, and it is the only place that settles which side of the line you are on. Read it once, this month, so you know before January whether you are protected. The difference is checkable in about five minutes, and it tells you whether to budget for a flat deposit or a smaller one.

Where to find your 2026 numbers

Everything in this subtraction comes down to numbers only you have – your gross benefit, your MAGI from two years back, your withholding choices – and all three are retrievable in an afternoon. Three sites, three lookups, no estimating.

Start with your my Social Security account. It lists your gross monthly benefit and your current deduction as two separate lines, and those are the only figures in this whole exercise that describe you rather than a typical case. Write both down. Next, SSA.gov for the official 2026 COLA percentage. Next, Medicare.gov for the 2026 Part B premium and the IRMAA threshold table.

Now the worksheet. Step one is your gross benefit from that statement. Step two: multiply it by the COLA percentage to get your dollar COLA. Step three: take the 2026 premium from Medicare.gov, subtract the premium currently being deducted, and you have the premium change. If you have Part D withheld, pull that plan's own premium notice and add its change to step three, alongside Part B.

Then the net: dollar COLA minus premium change. That number is your real raise.

Before you trust it, run two checks. Does IRMAA apply at the MAGI on your return from two years back? Does hold-harmless actually cover you, or are you a new enrollee, an IRMAA case, or someone without withholding? Those are the two conditions that break the plain subtraction – and if neither applies, the figure you wrote down is the figure that will land.

Frequently Asked Questions

Will my check actually go up in 2026?

It goes up only if your dollar COLA exceeds the dollar increase in your Part B premium. Run the subtraction with the official figures from SSA.gov and Medicare.gov. If the premium increase is larger and the hold-harmless rule covers you, the check holds level instead of dropping.

Why did my COLA letter say 2.8% when my deposit barely moved?

Because the percentage applies to your gross benefit, not your deposit. The Part B premium is then subtracted from that same gross figure, so part of the raise is consumed before the money reaches your bank. Convert both the COLA and the premium change to dollars to see the truth.

Does the hold-harmless rule protect me from a premium increase?

It protects qualifying beneficiaries from a net decrease caused by a higher Part B premium, not from the premium itself. New Part B enrollees for that year, people subject to IRMAA, and people without premium withholding from Social Security are excluded. SSA.gov states the exact conditions.

What is IRMAA and can it wipe out my whole raise?

It is an income-related surcharge added to Part B and Part D premiums, based on your modified adjusted gross income from the return filed two years earlier. A single large income year can trigger it, and yes, the surcharge can exceed the dollar COLA outright. The thresholds live on Medicare.gov.

Should I have my Part D premium deducted from Social Security?

Withholding is convenient but adds a third subtraction to the same check. Paying it separately does not reduce the cost, it only moves where it comes from. Compare your plan's premium against your cash flow and decide which account you would rather see it leave.

Where do I find my own gross benefit and deduction amounts?

In your my Social Security account. The statement lists the gross benefit and the Medicare deduction as separate lines for the same month, which is exactly the pair of numbers the worksheet starts from. Nothing else describes your situation rather than a typical one.

Three lookups, one subtraction, one login

So the answer is one subtraction, and you can run it before the money moves. Your COLA raises the top line of the check; the Part B premium takes from the same check in the same month; whatever survives that arithmetic is your real raise. It comes from official figures and your own statement, not from deposit-day guesswork.

Write it out: gross benefit from your my Social Security account, the 2026 COLA from SSA.gov, the 2026 Part B premium from Medicare.gov. Dollar COLA minus the premium change gives the net. Then the two checks that bend it – IRMAA against your modified adjusted gross income from two years back, and hold-harmless if you are a new enrollee, an IRMAA case, or someone whose premium is not withheld from the check.

The letter's percentage and the deposit were never supposed to match. Put the premium into the same line of arithmetic and the gap stops being a surprise. Start by logging in to my Social Security and reading the current benefit and deduction lines – two numbers, sitting there now.

Then in January, when the alert shows an amount $12 above December's, you will already know whether $12 is the whole story or whether the premium ate most of a raise you can now name to the dollar.