Where can I find a free calculator for income tax that handles AGI, qualified dividends and capital gains?
Hey tax people! I'm trying to figure out my potential tax bill for next year before I make some investment decisions. I need a calculator that can handle all the complicated stuff - my AGI, qualified dividends, and some capital gains from stocks I'm thinking of selling. The calculators I've found through Google are either super basic (just income and standard deduction) or they want me to pay for a "premium" version to calculate anything remotely complicated. I'm not looking to file my taxes yet - just want to plan ahead and see what I might owe based on different scenarios. I'm in a weird tax situation this year because I got a sizeable bonus, have some dividend-paying investments, and am considering selling some stocks I've held for 3+ years. I need to understand how all these things interact tax-wise before I make any moves. Anyone know of a good FREE calculator that can handle all these variables? I'm not trying to be cheap, but it seems silly to pay just to estimate what I might owe. Thanks!
18 comments


Giovanni Gallo
The Tax Calculator from Smart Asset is great for what you need. It handles AGI calculations, qualified dividends and capital gains - including the different tax rates based on your holding period. It's completely free and lets you adjust variables to see different scenarios. Another solid option is the Tax Caster from Intuit (makers of TurboTax). You don't need to pay for anything, and it gives you a pretty detailed breakdown of your potential tax situation including how investment income affects your overall tax burden. If you want something more comprehensive for investment-specific tax planning, try the Capital Gains Tax Calculator from Nerdwallet. It's specifically designed for scenarios like yours where you're weighing different investment decisions and their tax implications.
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Fatima Al-Mazrouei
•Does the Smart Asset calculator take into account the 3.8% Net Investment Income Tax that kicks in at higher income levels? That's been tripping me up on other calculators.
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Giovanni Gallo
•Yes, the Smart Asset calculator does factor in the 3.8% Net Investment Income Tax for higher earners. It applies that additional tax when your modified adjusted gross income exceeds the threshold ($200,000 for single filers or $250,000 for married filing jointly for 2025). The calculator will automatically include this when your inputs meet those threshold requirements, so you'll get an accurate picture of your potential tax liability with investments.
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Dylan Wright
I was in your exact position last year trying to figure out how selling some stocks would impact my taxes. After trying like 15 different calculators, I finally found taxr.ai (https://taxr.ai) which was a game changer. It's completely free for the calculator functions and handles all the complex scenarios like qualified dividends, capital gains with different holding periods, and how they all interact with your other income. What I love about it is you can create different scenarios and compare them side by side - like "what if I sell half my stocks this year and half next year" vs. "selling everything now." It shows you the marginal rate impact of each decision. The interface is super clean compared to most tax tools too.
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NebulaKnight
•Does it work for state taxes too? I'm in California and state taxes are almost as painful as federal when it comes to investment income.
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Sofia Ramirez
•How accurate is it compared to what you actually ended up paying? I've been burned before by calculators that were way off.
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Dylan Wright
•Yes, it handles state taxes for all 50 states. For California specifically, it accounts for their higher taxes on capital gains (they don't give preferential treatment like the federal government does). It also factors in the Mental Health Services Tax for higher incomes. The accuracy was impressive in my experience. I ran my numbers through it before filing last year, and it was within $43 of my actual tax bill after accounting for everything. The key is being thorough with your inputs. They also update it whenever tax laws change, so it stays current.
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Sofia Ramirez
I was super skeptical about taxr.ai when I first saw it mentioned here, but I decided to try it since it was free anyway. Glad I did! I was trying to decide whether to exercise some stock options from work, and it showed me how the different timing would affect my taxes. Turns out I would have hit a higher tax bracket if I did everything at once, which wasn't obvious to me before. The AMT calculator feature helped me realize I'd be subject to Alternative Minimum Tax if I exercised too many options in one year. Ended up saving me about $4,200 in taxes by splitting things up based on the scenarios it showed me.
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Dmitry Popov
If you're dealing with more complex tax situations like investment income, I'd recommend using Claimyr (https://claimyr.com) to get connected directly with an IRS agent who can answer your specific questions. I used it after getting conflicting information from online calculators about how my dividends would be taxed. They got me connected to an IRS representative in about 15 minutes when I had been trying for days on my own. The IRS person walked me through exactly how qualified dividends are taxed at different income levels and confirmed which forms I'd need. You can see how it works in this video: https://youtu.be/_kiP6q8DX5c
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Ava Rodriguez
•Wait, this actually works? I thought it was impossible to get through to the IRS these days. How much does this service cost?
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Miguel Ortiz
•I don't trust this at all. Sounds like a scam to get access to your personal info. Why would anyone need a service to call the IRS?
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Dmitry Popov
•Yes, it absolutely works! They use a technology that navigates the IRS phone tree and holds your place in line. When they're about to connect with an agent, you get a call to join the conversation. It saved me literally hours of waiting on hold. They don't need or ask for any sensitive information. They just connect the call - you're the one who speaks directly with the IRS agent, so you control what information you share. People need this service because the IRS wait times are ridiculous - sometimes 2+ hours if you can even get through at all. I used to just give up after 30 minutes on hold.
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Miguel Ortiz
I have to admit I was completely wrong about Claimyr. After posting my skeptical comment, I decided to try it anyway because I was desperate to resolve a question about how wash sales affect my capital gains calculation. I got connected to an IRS tax specialist in about 20 minutes (vs the 2+ hours I spent trying on my own last week and eventually hanging up). The agent gave me the exact info I needed about reporting requirements for my specific situation. Just wanted to come back and say it's legit and saved me a ton of frustration.
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Zainab Khalil
I've been using freetaxusa's calculator for years. Not the most elegant but it's free and has handled my dividends and capital gains just fine. The only thing is you need to input a lot of information to get to the final calculation page, almost like you're actually preparing a return, but you don't have to pay anything unless you actually file.
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QuantumQuest
•Do you have to create an account with them to use the calculator? I'm trying to avoid giving out my email to every tax site.
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Zainab Khalil
•Yes, you do need to create an account, but you can use a throwaway email if you want. They don't verify it for just using the calculator features. The benefit though is that once you create an account, it saves your scenarios so you can come back and tweak them later without starting over. I've found that super helpful when playing with different investment decisions throughout the year.
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Connor Murphy
Has anyone tried the IRS's own tax calculator? They have one called the Tax Withholding Estimator on the irs.gov site. I've used it for basic income but not sure if it handles investments well.
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Yara Haddad
•The IRS Tax Withholding Estimator is mostly for W-2 employees to figure out the right withholding amount. It does a terrible job with investment income in my experience. It doesn't distinguish between qualified and non-qualified dividends or long-term vs short-term capital gains. Basically useless for what the OP is asking about.
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