IRMAA Income Checker Tool: What Counts Toward MAGI & IRMAA?

Most IRMAA Income calculators start by asking for your MAGI. Right?

Okay… but what if that is the number you are trying to figure out? Welcome to my IRMAA Income Checker tool – find out which of your income counts towards MAGI and IRMAA

Does an IRA withdrawal count? What about a Roth withdrawal? Capital gains? Social Security? Municipal bond interest that is supposedly “tax-free”?

That is where people get tripped up.
The part most IRMAA Income calculators skip.

IRMAA MAGI is not simply every dollar that hits your bank account. Some income counts in full. Some counts only to the extent it is taxable. Some normally does not count at all. And municipal bond interest? Tax-free does not mean IRMAA-free.

This IRMAA Income Checker helps you sort through it.

• Select the income sources or financial events that apply to you. You will get the quick answer first. “Yes, usually no, or it depends.”
• Then, only if you want the deeper answer, you can add amounts and see whether the income could push you across an IRMAA threshold.

Quick note before you use the tool

IRMAA is based on your tax return, generally from two years earlier. Your 2026 Medicare premiums are usually based on your 2024 income. The checker shows both years so you do not have to keep doing that mental math.

What Does the IRMAA Income Checker Tell You?

The tool answers the question most people actually have:

▶ Will this income or financial move count toward the MAGI Medicare uses for IRMAA?

You can use it for one income source or select several.
The first result is intentionally simple:

• Yes: It generally increases IRMAA MAGI.
• Generally no: It normally stays out of IRMAA MAGI when the rules are met.
• It depends: Only part may count, or another fact changes the answer.

That is enough for plenty of people who just want a straight answer without the financial jargon.

But money is rarely that clean. So the checker can also explain what portion counts, which exception matters, where the income usually appears on your tax return, and what question you should ask next.

What Income Counts Toward IRMAA MAGI?

Here is the basic formula… IRMAA MAGI formula

IRMAA MAGI = Adjusted Gross Income + Tax-Exempt Interest

Simple formula.
Not always a simple number.

Your adjusted gross income can include wages, taxable retirement distributions, pensions, taxable Social Security, interest, dividends, capital gains, business income, rental income, and other taxable income.

Then tax-exempt interest gets added back.
That last part surprises people. Municipal bond interest can be exempt from federal income tax and still increase the MAGI used for Medicare premiums.

Again… tax-free does not mean IRMAA-free.

Social Security defines IRMAA MAGI as AGI plus tax-exempt interest. It normally uses tax information from two years before the Medicare premium year. For example, 2026 premiums are generally based on 2024 tax information.

▶ Need the full explanation behind the formula? Read what income counts toward IRMAA MAGI.

Quick IRMAA Income Reference

This is the scan-it-and-go version.

The word taxable matters. A lot.

This table is a starting point, not the entire tax code shoved into three boxes.

For example, saying an IRA withdrawal counts does not mean the gross distribution always counts dollar for dollar. If the IRA contains nondeductible contributions, part of the withdrawal may be a nontaxable return of basis.

A home sale is another easy one to misunderstand. The sale price does not simply become IRMAA income. The taxable gain after basis, selling costs, improvements, exclusions, and other rules is what may flow into AGI.

That is why the checker asks follow-up questions only when they matter.

https://www.reddit.com/r/RealWorldMoney/s/unqrOzE0cJ

Why Your Income Can Raise Medicare Premiums Two Years Later

IRMAA has a delayed punch.
You make a move this year. The Medicare bill may show up two years later.

• Sell appreciated stock in 2024? That gain may affect 2026 Medicare premiums.
• Complete a Roth conversion in 2025? The income may affect 2027 premiums.
• Take a large RMD in 2026? You may feel it in 2028.

This delay is why people get blindsided. They remember what their income looks like now. Social Security is looking backward.

Real-life example

Jim retires and his current income drops. Great. But two years earlier he sold stock and completed a large Roth conversion. His Medicare premium is based on that higher-income tax return, not the smaller checks hitting his account today.

That does not automatically mean the IRMAA determination is wrong. It means the two-year lookback is doing exactly what it was designed to do.

If retirement, work stoppage, marriage, divorce, death of a spouse, or another qualifying life-changing event reduced your income, you may be able to ask Social Security for a new determination. Start with my SSA-44 IRMAA appeal guide or use the IRMAA life-changing event checker.

The Income Sources That Surprise Retirees Most

Municipal Bond Interest

This is the classic trap.

• Municipal bond interest may be federally tax-exempt. But it gets added back when IRMAA MAGI is calculated.
• So yes, the income can avoid federal income tax and still help push you into a higher Medicare tier.
• It is not “bad” income. That is not the point.
• The point is to compare the real after-tax and after-IRMAA result. Not just the yield printed on the statement.

Roth Conversions

A Roth withdrawal and a Roth conversion are not the same thing.

• A qualified Roth withdrawal generally does not increase AGI.
• A Roth conversion generally does, to the extent the converted amount was not already taxed.
• That income can raise Medicare premiums two years later.

Does that make the conversion a mistake? No.

A conversion can still reduce future RMDs, improve survivor planning, create tax-free flexibility, and help heirs. But ignoring the IRMAA cost when you run the numbers is sloppy.

▶ Use my Roth conversion and IRMAA tradeoff guide when the checker flags a conversion.

Capital Gains

• Capital gains count.
• The entire sale price does not.
• If you sell $150,000 of stock with a $120,000 cost basis, you did not create $150,000 of gain. You created a $30,000 gain before considering losses and other adjustments.
• Same idea with a house. Sale price and taxable gain are two completely different numbers.

This sounds obvious until someone types the sale proceeds into a calculator and panics.

Social Security

Social Security is a “maybe” because the taxable portion depends on your other income.

• Up to 85% of benefits can become taxable. That does not mean Social Security is taxed at an 85% tax rate. It means up to 85% of the benefit may enter taxable income.
• That taxable portion becomes part of AGI and can affect IRMAA.
• The ugly part? More IRA income can make more Social Security taxable, which raises AGI further. Income stacking on income. Fun.

▶ See the Social Security tax threshold and IRMAA trap for a deeper example.

Required Minimum Distributions

RMDs are not optional because you do not need the money.

The taxable portion still enters AGI.

That is why IRMAA planning often starts years before the first RMD. Smaller Roth conversions in lower-income years may reduce future RMDs. Qualified charitable distributions may keep eligible charitable gifts out of AGI.

Timing matters.

▶ Read what to do with RMDs you do not need and my QCD and IRMAA guide.

How Close Are You to the Next IRMAA Threshold?

This is where the detailed part of the checker earns its keep.

IRMAA uses income tiers. It is not a smooth little percentage that rises one penny at a time.

You can be below a threshold and owe no surcharge for that tier. Cross it, even slightly, and the higher Part B and Part D amounts can apply for the year.

The $1 IRMAA problem

One extra dollar does not always cost you anything. But the dollar that pushes you across an IRMAA threshold can trigger hundreds or thousands of dollars in additional annual Medicare costs.

That is the logic behind one of the bluntest ways I explain IRMAA:

Every dollar of MAGI-increasing income can effectively cost $0.12 to $0.85 in IRMAA when it pushes you across a Medicare income threshold.

The exact result depends on filing status, household Medicare enrollment, the transaction size, and which tier you cross.

The tool compares your estimated MAGI before and after the selected income. It then shows:

• Your estimated IRMAA tier
• How far you are from the next threshold
• The projected annual household surcharge
• Whether the selected income appears to move you into another tier
• The effective IRMAA cost of that move

That does not tell you to avoid the income.

Sometimes paying IRMAA is the right tradeoff. A Roth conversion can still make sense. Selling a concentrated investment can reduce risk. Selling the house may fund the retirement you actually want.

IRMAA is a cost to include. Not a reason to let the tax tail wag the financial dog.

What Can You Do If Income May Trigger IRMAA?

1. First, do not start rearranging your entire financial life to save one year of Medicare surcharges.
2. Run the actual numbers.
3. Then look at the moves that fit the situation.

Spread Flexible Income Across Tax Years

1. Capital gains, Roth conversions, and discretionary retirement withdrawals may be flexible.
2. Instead of bunching everything into one year, compare the cost of spreading the income across multiple years.
3. But check the tax brackets too. Avoiding IRMAA while creating a larger federal tax bill is not exactly a win.

Use Qualified Charitable Distributions When Eligible

1. A QCD can satisfy part or all of an RMD while keeping the qualifying distribution out of AGI.
2. That can be more valuable than taking the distribution, writing a check to charity, and claiming an itemized deduction you may not even use.

Use Roth and HSA Money Strategically

1. Qualified Roth distributions and qualified HSA withdrawals generally do not increase AGI.
2. That gives retirees something incredibly useful: control.
3. You can fund a large expense without automatically stacking more taxable income into the same year.

Harvest Losses Against Capital Gains

1. Capital losses can offset capital gains under the tax rules.
2. That may reduce the net gain reaching AGI. Read my tax-loss harvesting and IRMAA guide before assuming the gross gain is the final number.

Appeal When the Rules Actually Allow It

1. IRMAA is not appealable merely because the bill feels unfair.
2. But a qualifying life-changing event or corrected tax information may support a new determination or reconsideration.
3. Use the right process for the right problem. Throwing Form SSA-44 at every situation is not a strategy.

▶ My complete guide to avoiding or reducing IRMAA walks through the planning options in more detail.

What This Tool Cannot Know

The checker is designed to be useful without pretending it can see your entire tax return.

It cannot automatically know:

• Your cost basis
• Your IRA basis from nondeductible contributions
• Your exact taxable Social Security amount
• Your annuity exclusion ratio
• Your home-sale basis and exclusions
• Suspended passive losses
• Whether a settlement is taxable
• What the IRS or Social Security will ultimately accept

Where the answer depends on one of those facts, the tool says so.
That is better than fake precision.

Best way to use the detailed estimate?

Use the taxable amount expected to appear on your tax return, not the cash received. If you are unsure, check the relevant tax form or ask your tax professional before treating the estimate as final.

IRMAA Income Checker FAQs

Build the Right MAGI Number Before You Plan Around It

IRMAA planning starts with the right income number.

• Not gross cash flow.
• Not whatever number happened to be easiest to find.
• Not a guess based on what feels taxable.

Start with AGI. Add tax-exempt interest. Understand which proposed transactions change that result.
Then look at the threshold.

That order matters.
Because avoiding IRMAA based on the wrong MAGI number is not planning. It is just guessing with a calculator.

Your next step?

▶ Run the IRMAA Income checker with the income sources you are concerned about. If a result says “it depends,” answer the short follow-up questions. Then use the linked guide for the one issue that actually needs a deeper look.

Official sources: The tool’s premium amounts and thresholds are based on published Medicare data from CMS. The MAGI formula and two-year lookback follow Social Security guidance. Rules and thresholds change, so confirm current figures before completing a major transaction.

Note: This content is for informational and educational purposes only and should not be considered financial, legal, or tax advice. Please consult a qualified professional for guidance specific to your situation.