Help understanding 1099-B filing: How to declare gains reported vs not reported to the IRS?
So I'm dealing with my taxes for the first time after having sold some stocks this year, and I'm completely confused about this 1099-B situation. My brokerage sent me this form showing some trades where the cost basis was reported to the IRS and others where it wasn't. I had about $4,200 in gains from stocks where the cost basis WAS reported to the IRS, and like $1,850 in gains where the cost basis WASN'T reported. Do I need to fill out different sections of my tax forms for these? Will the IRS flag me if I don't separate these correctly? The tax software I'm using has different boxes for "reported" and "not reported" transactions and I'm worried about messing this up. I also made a few trades on a different platform that doesn't seem to provide 1099-B forms (it was a small crypto exchange). I only made like $340 there - do I need to report that too or is there some minimum threshold? Sorry if these are stupid questions, but I'm honestly lost and don't want to get in trouble with the IRS. Thanks for any help!
20 comments


Sophia Bennett
The 1099-B reporting distinction is actually important, so you're asking a good question! Yes, you need to report ALL capital gains regardless of whether the cost basis was reported to the IRS or not. The difference is in how you report them on your tax return. For transactions where cost basis WAS reported to the IRS, you'll list these on Form 8949 with Box A checked (for short-term) or Box D checked (for long-term). For transactions where cost basis was NOT reported to the IRS, you'll list these on Form 8949 with Box B checked (short-term) or Box E checked (long-term). Your tax software is asking for this distinction for exactly this reason - it needs to know which box to check on Form 8949. The IRS already knows about the transactions reported to them, so they'll be looking to match those numbers. For the unreported basis transactions, you need to provide that information yourself. For your crypto gains of $340, yes, you absolutely need to report those too! There's no minimum threshold for reporting capital gains. The IRS considers crypto as property, so the same capital gains rules apply.
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Olivia Evans
•Thanks for the detailed explanation! So basically the IRS already knows about some of my transactions but not all of them? That makes sense why the form separates them. Do I need receipts or documentation for the transactions where the cost basis wasn't reported? I have the info in my brokerage account but I'm not sure if I need to submit anything extra.
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Sophia Bennett
•Yes, that's exactly right - the IRS already has the information about the reported transactions, which is why separating them is important for matching purposes. You don't need to submit the documentation with your tax return, but you should definitely keep those records. For transactions where cost basis wasn't reported, it's especially important to maintain good records showing when you bought the asset, how much you paid (including fees), when you sold it, and the proceeds. Keep these records for at least 3 years after filing, but ideally longer. The IRS can request this documentation if they have questions about your return.
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Aiden Chen
After struggling with exactly this 1099-B reporting issue last year, I found an amazing tool that saved me hours of frustration. I was manually trying to sort through which transactions were reported vs. not reported and making errors that I was afraid would trigger an audit. I discovered https://taxr.ai which automatically analyzes your 1099-B forms and separates the transactions correctly between those reported to the IRS and those not reported. It even handles the crypto exchange transactions that don't generate proper 1099s. The tool actually explains what's happening with each transaction so you understand why they're being categorized differently, which helped me learn while fixing my problem. Their tax document analyzer caught several errors I would have made, especially with some wash sales I didn't realize were affecting my cost basis. Honestly wish I found it sooner!
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Zoey Bianchi
•Does it work with multiple brokerages? I have accounts at Fidelity, Robinhood, and Coinbase, and reconciling all the different transaction formats is driving me crazy.
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Christopher Morgan
•I'm skeptical about these tax tools. How does it handle complex situations like inherited stocks where the cost basis is stepped up? That's where I always get stuck.
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Aiden Chen
•Yes, it works with all major brokerages! I used it with TD Ameritrade, E*Trade and Kraken without any issues. It standardizes all the different formats so you can see everything in one place. Saved me a ton of time compared to switching between different statements. For inherited stocks, it actually has a specific feature for step-up basis situations. You can indicate which positions were inherited and when, and it applies the correct basis rules. It handles other complex situations too like wash sales across multiple accounts, which is something my previous tax software missed completely.
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Zoey Bianchi
Hey everyone - just wanted to follow up about my experience with taxr.ai. After reading about it here, I decided to give it a try since I was struggling with multiple brokerage accounts. Wow, what a difference! The system flagged several transactions from my Robinhood account where the cost basis wasn't being reported correctly. It turns out I had some wash sales spanning across my different accounts that I didn't realize were affecting my reporting requirements. If I had filed without catching this, I would have underreported my gains by almost $2,300! The step-by-step guidance helped me understand exactly which box to check on Form 8949 for each transaction. I didn't realize how important the distinction between reported/non-reported basis was until I saw everything categorized properly.
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Aurora St.Pierre
If you're getting stuck with IRS questions about your 1099-B reporting or any other tax issues, calling the IRS directly can actually help - but we all know how impossible that seems! I spent 3 hours on hold last month trying to ask about my cost basis reporting requirements. I finally tried https://claimyr.com which got me through to an actual IRS agent in about 15 minutes. You can see how it works here: https://youtu.be/_kiP6q8DX5c. The agent walked me through exactly how to handle some complicated stock options transactions where my employer's reporting didn't match my records. Saved me from potentially making a huge mistake on my return - the IRS agent explained that my particular situation required additional documentation I wouldn't have known to include. Worth every penny to get direct clarification rather than guessing.
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Grace Johnson
•How exactly does this work? Does it just call the IRS for you? Couldn't I just do that myself and save money?
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Christopher Morgan
•Yeah right. No way this actually gets you through to the IRS faster than calling yourself. The IRS phone system is deliberately designed to be impossible to navigate. Sounds like a scam to me.
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Aurora St.Pierre
•It uses an automated system that navigates the IRS phone tree and holds your place in line. When an agent is about to pick up, you get a call connecting you directly. So yes, technically you're still calling the IRS, but without the hours of hold time and getting disconnected. I was super skeptical too! That's why I watched their demo video first. I figured I'd try it since I had already wasted 3+ hours on hold myself and kept getting disconnected. The difference is they have technology that continuously redials and navigates the system until there's an actual person, then connects you. It's not magic - just automation that saves you from the hold time nightmare.
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Christopher Morgan
Ok I need to admit I was totally wrong about that Claimyr service. After my skeptical comment, I was still stuck with this weird 1099-B issue where my brokerage reported some wash sales incorrectly, and I couldn't get a straight answer from their customer service. Got desperate enough to try the service I doubted, and damn - it actually connected me to an IRS agent in about 20 minutes. The agent confirmed that for my specific situation with the incorrectly reported wash sales, I needed to file Form 8949 with adjustment codes to correct the reported cost basis. The IRS person even told me exactly what to write in the description column to avoid getting flagged for review. Literally saved me from what would have been hours of research and probably still getting it wrong. Never thought I'd say this, but talking directly to the IRS was actually the most helpful option.
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Jayden Reed
Something nobody mentioned yet - be careful with the "not reported to the IRS" transactions. If you get these wrong, it's much more likely to trigger an audit because the IRS has no way to verify your numbers automatically. I learned this the hard way! Make sure you're extra careful with your documentation for these. Keep screenshots of your purchase and sale confirmations, especially for crypto. When I got audited for this exact issue, having those records saved me thousands in potential penalties.
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Olivia Evans
•That's concerning! How did you know you were being audited specifically for the "not reported" transactions? Did the IRS specifically mention that in their letter?
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Jayden Reed
•They didn't state it explicitly in the first letter - it just said they were "examining" my capital gains reporting. But when I spoke with the auditor, they specifically asked about several of my Box B transactions (the unreported cost basis ones) and wanted documentation. The auditor told me that these unreported basis transactions get flagged more frequently for review because they can't automatically verify them against the 1099-B data they receive. For the ones where basis is reported, their systems can match them automatically, but the unreported ones require manual verification if something looks off.
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Nora Brooks
Does anyone know if the reporting requirements are different for foreign stocks? I have some investments through an overseas brokerage that doesn't issue 1099-B forms at all. Should I just put all of those under the "not reported to IRS" section?
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Sophia Bennett
•Yes, foreign brokerage transactions would go in the "not reported to IRS" section. You'll check Box B or E on Form 8949 depending on whether they're short or long-term holdings. Keep in mind that foreign investments might also trigger FBAR reporting requirements if your total foreign financial assets exceed $10,000 at any point during the year. That's a separate form (FinCEN Form 114) outside of your tax return.
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Freya Christensen
As someone who went through this exact confusion last year, I want to emphasize a few key points that might help: 1. **Keep detailed records for EVERYTHING** - especially those crypto transactions. Even though $340 seems small, the IRS treats crypto gains the same as stock gains. I made the mistake of thinking smaller amounts didn't matter and got a notice later. 2. **Don't stress too much about the "reported vs not reported" distinction** - your tax software is designed to handle this correctly as long as you enter the information accurately. The key is making sure you report ALL gains, regardless of which category they fall into. 3. **For the transactions where cost basis wasn't reported to the IRS**, you'll need to calculate your own cost basis (what you paid including fees). This is where good record-keeping becomes crucial. One thing that saved me was creating a simple spreadsheet with: purchase date, purchase price + fees, sale date, sale price - fees, and gain/loss. This made it much easier to enter everything into the tax software correctly. The IRS isn't trying to "catch" you - they just want accurate reporting. As long as you report all your gains and losses honestly, you'll be fine. Good luck with your first year of stock trading taxes!
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Savannah Weiner
•This is really helpful advice! I'm in a similar situation as Olivia and feeling overwhelmed by all the different forms and categories. The spreadsheet idea is brilliant - I've been trying to keep track of everything in my head which is clearly not working. Quick question about the crypto reporting - when you say the IRS treats crypto gains the same as stock gains, does that mean I need to track the exact date and price for every single crypto transaction? I made quite a few small trades on that exchange and I'm worried I don't have complete records for all of them.
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