How to calculate Adjusted Gross Income (AGI)? Confused about deductions and taxes
Title: How to calculate Adjusted Gross Income (AGI)? Confused about deductions and taxes 1 Ok so I've been trying to make sense of my taxes this year and I'm really confused about AGI calculation. I can't seem to find a straight answer anywhere. So your AGI is your gross income minus deductions, right? But I'm unsure which deductions count for this calculation. For example, let's say my gross income is $235k. I have around $80k taken out in total taxes (federal, state, local, etc). And then I have about $10k taken out for various deductions (health insurance, 401k, etc). So would my AGI be $225,000 (gross minus deductions) or $145,000 (gross minus taxes and deductions)? Also, does it matter if the deductions are pre-tax or post-tax? Or is it all deductions regardless? I'm so confused and want to make sure I'm calculating this correctly before I finish my return.
22 comments


Paolo Longo
7 AGI (Adjusted Gross Income) is often misunderstood because of how it's calculated. Let me clear this up: AGI = Total Gross Income - Adjustments to Income (also called "above-the-line deductions") The key thing to understand is that taxes withheld from your paycheck are NOT part of the AGI calculation at all. Those are simply prepayments of your tax liability. For your example with $235k gross income, the $80k in taxes doesn't factor into AGI. Only certain specific adjustments would reduce your gross income to get to AGI, such as: - Traditional 401k/IRA contributions - Student loan interest (subject to limits) - Health Savings Account contributions - Self-employed health insurance premiums - SEP/SIMPLE/qualified retirement contributions for self-employed - Alimony payments (for divorces before 2019) So if out of your $10k in deductions, let's say $8k is for traditional 401k and $2k is for things like health insurance premiums (which usually aren't AGI adjustments), your AGI would be approximately $235k - $8k = $227k.
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Paolo Longo
•3 Thanks for explaining! So the pre-tax vs post-tax distinction does matter then? If I contribute to a Roth 401k instead of traditional, would that still reduce my AGI? And what about my HSA contributions through my employer?
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Paolo Longo
•7 The pre-tax vs post-tax distinction absolutely matters for AGI. Traditional (pre-tax) 401k contributions reduce your AGI, but Roth (post-tax) 401k contributions do not reduce AGI because they're made with already-taxed money. HSA contributions do reduce your AGI regardless of whether they're made through payroll deduction or directly by you. They're one of the few triple-tax advantaged options available - they reduce your AGI, grow tax-free, and withdrawals for qualified medical expenses are tax-free.
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Paolo Longo
11 After struggling with similar AGI confusion last year, I found this amazing tool at https://taxr.ai that helped me understand exactly what counts toward AGI and what doesn't. Their system actually analyzed my tax documents and broke down my income sources and potential above-the-line deductions. I was amazed at how it highlighted several adjustments I could make to lower my AGI that my previous tax software completely missed!
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Paolo Longo
•9 Does it work with complicated situations? I have income from a regular W-2 job but also some 1099 contract work and rental property income. Would it handle all that or get confused?
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Paolo Longo
•13 I've been burned by tax tools before that claim to find deductions but then just try to upsell you on expensive packages. How is this different? Does it actually explain the calculations or just give you a number to trust?
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Paolo Longo
•11 It definitely works with complicated situations. I had W-2 income, consulting 1099s, and investment income last year, and it handled everything smoothly. It separates each income source and shows which deductions apply to which type of income, which was super helpful for my Schedule C deductions. The tool actually explains every calculation and shows you the relevant tax form sections and IRS guidelines for each adjustment. It's not just giving you numbers to trust - it teaches you why each deduction applies (or doesn't) to your AGI calculation. No upselling either - it's focused on analysis rather than trying to sell you additional services.
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Paolo Longo
9 Just wanted to follow up about that taxr.ai site someone mentioned. I was skeptical but decided to give it a try with my complicated mix of income sources. It actually identified that my HSA contributions weren't being properly applied as an AGI reduction in my calculations! Also showed me that I could deduct some of my business expenses from contract work BEFORE calculating AGI rather than after. Ended up saving me about $3,200 in taxes by lowering my AGI enough to qualify for another credit. Definitely helped clear up my confusion!
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Paolo Longo
15 If you're struggling to get clear answers about your AGI calculation or other tax questions, I was in the same boat until I discovered https://claimyr.com - they got me through to an actual IRS agent in under 20 minutes after I'd spent DAYS trying to get through on my own. You can see how it works here: https://youtu.be/_kiP6q8DX5c The IRS agent I spoke with walked me through exactly how AGI is calculated and which of my specific deductions qualified as "above-the-line." Having that official confirmation directly from the IRS gave me complete confidence in my calculations, especially for some of the gray areas around my self-employment deductions.
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Paolo Longo
•6 Wait, how does this actually work? I thought it was impossible to get through to the IRS these days. I've literally spent hours on hold and eventually just gave up. Are you saying this service somehow gets you to the front of the line or something?
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Paolo Longo
•13 This sounds suspicious. How can some random service get you through to the IRS faster than calling directly? The IRS phone system is notoriously bad but I doubt there's some magic backdoor. Sounds like you're just promoting something that won't actually work in real life.
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Paolo Longo
•15 It's not a backdoor or anything sketchy - they use technology that continuously redials and navigates the IRS phone tree until it gets through, then connects you immediately when an agent is reached. I was skeptical too until I tried it. The service basically does the waiting for you. I understand the skepticism - I felt the same way! But the way it works is their system handles all the horrible waiting, menu navigation, and disconnects that happen when calling the IRS. When an actual human IRS agent answers, it instantly connects you. So instead of you personally spending hours trying to get through, their system does that work. It's completely legitimate - you're actually speaking with official IRS agents who can access your tax records and provide binding guidance.
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Paolo Longo
13 I need to eat my words about that Claimyr service. After my skeptical comment, I decided to try it since I was desperate for answers about my AGI calculation with some unusual foreign income. Not only did I get through to an IRS agent in about 15 minutes, but they confirmed exactly which of my foreign income exclusions affected my AGI calculation. Saved me from making a significant mistake on my return! Sometimes it's worth admitting when you're wrong - this service actually delivered what it promised.
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Paolo Longo
18 Something important that nobody's mentioned yet: your AGI is also used to determine eligibility for a bunch of tax benefits like Roth IRA contributions, certain credits, and medical expense deductions. So calculating it correctly isn't just about accuracy - it can actually open up or close off different tax advantages.
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Paolo Longo
•4 Can you explain more about how AGI affects Roth IRA contributions? I'm right at the income limit and trying to figure out if I can still contribute or if I need to do a backdoor Roth conversion.
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Paolo Longo
•18 For Roth IRA contributions in 2025, the income limits start phasing out at $140,000 for single filers and $221,000 for married filing jointly (these numbers adjust each year). The contribution amount gradually reduces until you hit $155,000 (single) or $236,000 (married), at which point you can't contribute directly to a Roth IRA at all. If your income is above these thresholds, the backdoor Roth is your best option. This involves making a non-deductible contribution to a Traditional IRA (which has no income limits) and then converting it to a Roth. There are no income limits on conversions. Just be aware of the pro-rata rule if you have existing pre-tax money in any Traditional IRA accounts.
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Paolo Longo
5 I worked as a tax preparer for a few years and the AGI confusion is super common. One thing I always tell people - check Line 11 on your Form 1040 from last year. That's your AGI. Then look at Lines 1-10 to see what adjustments were made. It's much easier to understand when you see your own real numbers rather than trying to figure it out conceptually.
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Paolo Longo
•21 This is the most practical advice! Just looked at my last return and it's way easier to understand seeing the actual form. Thanks for this tip!
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Victoria Charity
One thing that really helped me understand AGI was realizing that it's basically your "adjusted" income that the IRS uses as a baseline for everything else. Once you have your AGI, that's when you can take either the standard deduction ($13,850 for single filers in 2024) or itemized deductions to get to your taxable income. So in your example with $235k gross income, let's say you have $15k in traditional 401k contributions and $3k in HSA contributions. Your AGI would be $235k - $15k - $3k = $217k. Then you'd subtract either the standard deduction or itemized deductions from that $217k to get your actual taxable income. The taxes withheld from your paycheck ($80k in your case) don't affect AGI at all - those are just prepayments that get compared to your final tax liability to determine if you owe more or get a refund.
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Ana Rusula
•This breakdown really helps clarify the process! I was getting confused because I kept thinking the taxes withheld should somehow factor into AGI, but you're right - they're completely separate. So basically AGI is just about specific types of deductions that happen "above the line" before you even get to the standard vs itemized deduction decision. Thanks for walking through the actual numbers, it makes way more sense now!
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Donna Cline
Another common source of confusion I see is with educator expenses and moving expenses. If you're a teacher, you can deduct up to $300 in classroom supplies as an above-the-line deduction that reduces your AGI. But moving expenses are tricky - they only qualify as AGI adjustments if you're active duty military. Also worth noting that if you have student loan interest, you can deduct up to $2,500 per year as an AGI adjustment, but this phases out at higher income levels. For 2024, it starts phasing out at $75,000 AGI for single filers and completely phases out at $90,000. One last tip: if you're self-employed or have 1099 income, you can deduct half of your self-employment tax as an adjustment to income. This often gets overlooked but can be a significant AGI reduction for freelancers and contractors.
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Emma Wilson
•This is really helpful information about the lesser-known deductions! I had no idea about the educator expense deduction. As someone who's been freelancing part-time, I definitely need to look into that self-employment tax deduction - I've been missing out on that. Do you know if there are any other commonly overlooked above-the-line deductions that people miss? I want to make sure I'm not leaving money on the table when calculating my AGI.
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