Social Security and IRMAA calculation - what percent of SS benefits counts toward MAGI threshold?
I'm completely confused about how much of my Social Security counts when calculating MAGI for Medicare IRMAA surcharges. I just started receiving survivor benefits this year and I'm trying to plan an IRA withdrawal without triggering those extra Medicare premiums. I've found conflicting information online - some sites say 50% of SS counts, others say 85%, and a few claim your entire benefit amount is included in MAGI. When I called Medicare, the representative had no idea what MAGI even was and told me to contact Social Security instead! My financial situation this year includes my late husband's survivor benefits, a small pension, and I'm on unemployment for a few months. I need to take a distribution from my IRA but want to be strategic about the amount to avoid pushing myself into a higher IRMAA bracket. Does anyone know definitively how much of my Social Security gets counted toward MAGI for IRMAA purposes, or can you point me to a reliable resource? The last thing I need is a surprise premium increase for Medicare Parts B and D next year.
28 comments

Zoe Stavros
It's not a simple percentage - it depends on your total income. The taxable portion of your Social Security (which is what counts toward MAGI) can be 0%, up to 50%, or up to 85% depending on your combined income. For IRMAA purposes, MAGI includes your adjusted gross income (AGI) PLUS your tax-exempt interest income PLUS the taxable portion of Social Security benefits. If you file as an individual and your combined income (AGI + tax-exempt interest + 1/2 of SS benefits) is: - Under $25,000: 0% of your SS is taxable and counts toward MAGI - Between $25,000-$34,000: up to 50% of your SS may be taxable - Over $34,000: up to 85% of your SS may be taxable The exact calculation is a bit complicated, but you'll never have more than 85% of your Social Security benefits counted.
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Andre Moreau
AuthorThank you so much for this explanation. So it sounds like in my case (with pension, survivor benefits, and unemployment), I'll likely fall into that category where 85% of my SS counts. Is there a worksheet or calculator you'd recommend to figure out exactly how much I can withdraw from my IRA without crossing the IRMAA threshold?
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Jamal Harris
The previous answer is good but misses a key point - for IRMAA specifically, they look at your tax return from 2 years ago. So if you're concerned about IRMAA in 2025, they'll look at your 2023 tax return. If this is your first year on Social Security (2024), then your 2023 return wouldn't have included SS benefits. And yes, the maximum is 85% of your Social Security benefits that can be taxable and count toward MAGI. Never 100%. I recommend using the IRS Publication 915 worksheet to calculate the taxable portion of your benefits. Then use the IRMAA brackets on Medicare.gov to see where you fall.
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Mei Chen
this is so true!! my mom got hit with irmaa surcharges because of a one-time property sale 2 years before. she had no idea they look back like that!
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Liam Sullivan
I went through this exact headache last year! The SSA and Medicare people kept sending me back and forth between offices. Nobody seemed to know the answer. I finally figured out I needed to look at the IRMAA determination letter they sent me, which showed they were using my AGI plus tax-exempt interest plus taxable SS from my tax return.
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Andre Moreau
AuthorDid you eventually find someone knowledgeable to talk to? I feel like I'm getting nowhere with both agencies.
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Amara Okafor
OMG this IRMAA stuff is SO COMPLICATED!!!!! I've been dealing with this for 3 years and STILL don't understand it. Last year they charged me an extra $60 per month for Medicare because I took out too much from my 401k the previous year to fix my roof. I tried to appeal it with a life-changing event form but they DENIED it saying home repairs don't count!!!! The whole system is designed to confuse seniors and take our money!!!
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Zoe Stavros
You're right that home repairs don't qualify as a life-changing event for IRMAA appeals. The valid life-changing events are limited to: - Death of spouse - Marriage/divorce - Work reduction or stoppage - Loss of income from income-producing property - Loss of pension income - Employer settlement payment It's frustrating, but at least IRMAA is only based on that one year's income, so the surcharge should have gone away the following year.
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CosmicCommander
my tax guy said its up to 85% that counts. but what really matters is staying under the brackets. for 2024 the first bracket is $103,000 for individuals, $206,000 married. if you go $1 over you pay extra all year!
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Andre Moreau
AuthorThat's exactly what I'm trying to avoid! I need to take enough from my IRA to cover some expenses but not so much that I cross over that threshold. I'm trying to calculate exactly how much wiggle room I have.
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Giovanni Colombo
After struggling with this same issue, I discovered a tool that was actually helpful. The AARP has a tax calculator on their website that can help you estimate the taxable portion of your Social Security benefits. I've used it for the past two years and it's been pretty accurate. And just to echo what others have said - yes, the maximum that can be included in your MAGI for IRMAA calculations is 85% of your Social Security benefits, never 100%.
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Liam Sullivan
I just checked out that AARP calculator and it was really helpful, thanks for sharing this!
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Amara Okafor
Has anyone else noticed that you can call Social Security 5 times about IRMAA and get 5 COMPLETELY DIFFERENT ANSWERS???? I spent TWO WEEKS trying to get someone who understood how the MAGI calculation works. Every time I called I'd wait on hold for 2+ hours only to get someone who clearly had no idea what they were talking about!!!!
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Giovanni Colombo
I had the same frustrating experience trying to get through to SSA about IRMAA questions. After multiple failed attempts with 2+ hour waits, I found a service called Claimyr that got me through to a representative in under 10 minutes. They essentially call SSA for you and connect you when an agent is available. Saved me hours of hold time. You can see how it works at https://youtu.be/Z-BRbJw3puU or check out their website at claimyr.com. It was worth it to finally get my IRMAA questions addressed by someone who actually knew what they were talking about.
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Jamal Harris
To give you a concrete example of how this works: Let's say you receive $20,000 in Social Security benefits for the year. Your pension is $30,000. Unemployment is $10,000. To calculate how much of your SS is taxable: 1. Take half your SS: $10,000 2. Add that to your other income: $10,000 + $30,000 + $10,000 = $50,000 3. This is over $34,000, so up to 85% of your benefits may be taxable The actual calculation then gets complex (using worksheets in IRS Pub 915), but in this scenario, you'd likely have 85% of your SS ($17,000) included in your MAGI. So your MAGI for IRMAA would be approximately $57,000 ($30,000 pension + $10,000 unemployment + $17,000 taxable SS). Then you need to determine how much you can withdraw from your IRA before hitting the first IRMAA threshold.
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Andre Moreau
AuthorThis example is incredibly helpful! My numbers are somewhat similar. If the first IRMAA threshold is around $103,000 for 2024, then I'd have about $46,000 of room for my IRA withdrawal before triggering the surcharge. Does that sound right?
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Zoe Stavros
Yes, that's correct based on the example numbers. With a MAGI of $57,000 before any IRA withdrawal, you could potentially withdraw up to about $46,000 before hitting the first IRMAA threshold of $103,000 for an individual. Just remember two important things: 1. These IRMAA thresholds are adjusted each year for inflation, so the exact numbers might change slightly. 2. The IRMAA determination for 2026 will be based on your 2024 income (the 2-year lookback), so the planning you're doing now is for your Medicare premiums two years from now. It's smart to stay just under the threshold if possible, as even $1 over can trigger the full surcharge amount for the year.
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Andre Moreau
AuthorThank you! This has been so much more helpful than the conflicting information I was finding online. I appreciate everyone taking the time to explain this clearly.
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Kaiya Rivera
Just wanted to add one more resource that might help with your planning - the IRS has a Social Security Benefits Worksheet in Publication 915 that walks you through the exact calculation step by step. It's a bit tedious but gives you the precise taxable amount rather than just estimating. Also, since you mentioned you're dealing with survivor benefits specifically, be aware that survivor benefits are treated the same as regular Social Security benefits for tax purposes - so the same 0%/50%/85% rules apply. Sometimes people think survivor benefits have different tax treatment, but they don't. One strategy some people use is to spread their IRA withdrawals across multiple years to stay under the IRMAA thresholds, rather than taking a large lump sum in one year. Might be worth considering depending on your situation and timeline.
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Emma Wilson
I just want to echo what others have said about getting professional help with this. I made the mistake of trying to figure out IRMAA calculations on my own a few years ago and ended up withdrawing too much from my 401k, which pushed me into the next bracket. The extra Medicare premiums cost me way more than what a tax professional would have charged to help me plan it properly. One thing that helped me understand the Social Security taxation piece was realizing that the IRS uses what they call "provisional income" to determine how much of your SS is taxable. It's your AGI plus tax-exempt interest plus half of your Social Security benefits. Once you know that number, you can see which bracket you fall into (under $25k = 0% taxable, $25k-34k = up to 50% taxable, over $34k = up to 85% taxable). The good news is that once you understand the system, you can plan around it. I now do smaller IRA withdrawals spread across multiple years instead of taking large lump sums. It takes longer to access the money I need, but it keeps me under those IRMAA thresholds and saves me hundreds of dollars annually in Medicare surcharges.
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GalaxyGuardian
This is such valuable advice about spreading withdrawals across multiple years! I'm just starting to learn about all this Medicare planning stuff, and it's honestly pretty intimidating. Your experience with accidentally going over the threshold is exactly what I'm worried about happening to me. Can I ask - when you say you now do smaller IRA withdrawals, do you have a rule of thumb for how much is "safe" to withdraw each year? I know it depends on individual circumstances, but I'm trying to get a sense of whether there are any general guidelines people follow to stay comfortably under the IRMAA thresholds without having to recalculate everything from scratch each year. Also, did you find any particular resources or tools that helped you get better at planning these withdrawals once you learned from that costly mistake?
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GalacticGladiator
Great questions! After my expensive lesson, I developed a pretty conservative approach. My rule of thumb is to stay at least $10,000-15,000 below the first IRMAA threshold ($103,000 for 2024) to give myself a cushion for any unexpected income or calculation errors. For tools, I now use a combination of the AARP tax calculator that @Giovanni Colombo mentioned earlier, plus I have a spreadsheet where I track my projected AGI, estimated taxable Social Security (usually 85% in my case), and any other income sources. I update it quarterly and model different withdrawal scenarios. The key insight for me was realizing that it's not just about the IRA withdrawal amount - it's about how that withdrawal affects the taxable portion of my Social Security too. When your total income goes up, more of your SS becomes taxable, so there's kind of a multiplier effect. I also learned to time my withdrawals strategically - like taking a bit more in years when I have lower income from other sources, and backing off in years when I have higher pension payments or one-time income events. It requires more planning but has saved me thousands in avoided IRMAA surcharges. Honestly, after that first costly mistake, I also started working with a fee-only financial planner who specializes in Medicare planning. Best money I ever spent!
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Oliver Wagner
Great questions! For the "safe" withdrawal amount, I generally try to stay at least $5,000-10,000 below the first IRMAA threshold to give myself a cushion for any unexpected income or calculation errors. So if the threshold is $103,000, I aim to keep my total MAGI around $93,000-98,000. It's not a perfect science, but that buffer has kept me out of trouble. As for resources, I ended up working with a fee-only financial planner who specializes in retirement tax planning. The upfront cost was about $1,500 for a comprehensive analysis, but they created a multi-year withdrawal strategy that has saved me thousands in avoided IRMAA surcharges. They also introduced me to some online calculators that I use annually to double-check my planning. The key insight my planner shared was to think about IRMAA planning as a long-term strategy rather than trying to optimize just one year. Sometimes it makes sense to pay a little more in regular income taxes to avoid crossing into IRMAA territory. It's all about finding the right balance for your specific situation.
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Leo McDonald
Great question! After my expensive lesson, I developed a pretty conservative approach. My rule of thumb is to stay at least $10,000-15,000 below the first IRMAA threshold ($103,000 for 2024) to give myself a cushion for any unexpected income or market gains that might show up on my tax return. For planning tools, I use a combination of approaches: 1. The AARP tax calculator someone mentioned earlier - it's free and pretty accurate for estimating SS taxation 2. TurboTax's "What If" scenarios feature lets me model different withdrawal amounts before I actually take them 3. I created a simple spreadsheet that tracks my projected MAGI throughout the year so I don't lose track The key thing I learned is to calculate my "base" MAGI first (pension, SS, any other regular income), then figure out how much room I have left before hitting that $103k threshold. Whatever's left after my safety buffer is what I can safely withdraw from retirement accounts. One tip: if you're married, remember the IRMAA thresholds are much higher for joint filers ($206k for the first bracket), so that might give you more flexibility depending on your situation.
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Edward McBride
Great question! After learning the hard way, I developed a simple approach that's worked well for me. I start each year by calculating what my MAGI would be without any IRA withdrawals (including the taxable portion of SS using that provisional income formula). Then I subtract that from the first IRMAA threshold ($103,000 for 2024) and leave myself a $5,000-$10,000 buffer. So if my baseline MAGI is $60,000, I'd target withdrawing no more than $35,000-$40,000 from my IRA to stay comfortably under the threshold. The buffer protects against small miscalculations or unexpected income. For tools, I use the IRS Publication 915 worksheet annually to nail down exactly how much of my Social Security will be taxable, then I double-check everything with TurboTax's estimator tool before making my final withdrawal decision each December. The AARP calculator someone mentioned earlier is also pretty good for quick estimates. The key insight for me was realizing this is really about tax planning, not just retirement planning. Once I started treating it like any other tax optimization strategy, it became much more manageable!
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Matthew Sanchez
Great question about safe withdrawal amounts! I don't have a hard rule of thumb because everyone's situation is different, but here's what I learned works for me: I calculate my expected MAGI without any IRA withdrawals, then figure out how much room I have before hitting that first IRMAA threshold ($103,000 for 2024). I try to stay at least $5,000-$10,000 below the threshold as a safety buffer in case I have unexpected income or miscalculate something. For resources, I found a few things really helpful: - IRS Publication 915 (mentioned earlier) for the exact SS taxation calculations - The Medicare.gov IRMAA brackets page to see current thresholds - A simple spreadsheet where I model different withdrawal scenarios The key insight for me was realizing that it's not just about the IRA withdrawal amount - it's about how that withdrawal affects the taxable portion of my Social Security. When your total income goes up, more of your SS becomes taxable, so there's kind of a double hit on your MAGI. I also learned to time my withdrawals early in the year so I can monitor my income throughout the year and adjust if needed. Much better than scrambling at year-end!
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Caleb Stone
This thread has been incredibly helpful! I'm in a similar situation - just started receiving benefits this year and trying to navigate the IRMAA maze. One thing I wanted to add that might help others: I discovered that your state's SHIP (State Health Insurance Assistance Program) counselors are often really knowledgeable about Medicare and IRMAA calculations. They provide free counseling and many of them understand the connection between Social Security taxation and IRMAA better than the actual SSA representatives. I found my local SHIP counselor through the Medicare.gov website, and she walked me through a mock calculation using my specific numbers. It was incredibly valuable and didn't cost me anything. She also helped me understand that even though the IRMAA lookback seems unfair, there are strategic moves you can make in advance - like the Roth conversion ladders some people mentioned, or timing large expenses in years when you know your income will be higher anyway. For anyone feeling overwhelmed by all this (like I was!), I'd really recommend starting with a SHIP counselor before paying for professional help. They can at least help you understand the basics so you know what questions to ask if you do decide to hire a tax professional later.
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PixelPioneer
Thank you so much for mentioning SHIP counselors! As someone who's completely new to all of this Medicare stuff, I had no idea that free counseling was even available. I've been stressing about whether I need to pay for professional help right away, but it sounds like SHIP might be a great place to start. I just looked up my state's program and there's actually a local office pretty close to me. I'm going to call them next week to see if they can help me understand my specific situation before I make any IRA withdrawal decisions. It's such a relief to know there are knowledgeable people out there who can walk through these calculations without charging a fee! This whole thread has honestly been a lifesaver. I went from feeling completely lost about IRMAA and Social Security taxation to actually having a plan for how to move forward. The community knowledge here is amazing - way more helpful than anything I found through official channels.
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