Confused about accrued market discount on my T-Bill - how to report this on my tax return?

T-Bills with accrued market discount require specific tax treatment. When you purchase a T-Bill on the secondary market below its face value (at a discount), that discount amount is typically treated as interest income when you sell or redeem it. The accrued market discount shown on your 1099B should be reported as interest income on Schedule B, not as a capital gain. This is because the IRS views market discount on Treasury securities as interest income that accrues over the holding period. In TurboTax, you'll want to enter this in the Interest Income section, not in the Investment Sales section where you'd report other 1099B items. Make sure to note it as "Accrued Market Discount" so it's properly categorized. The proceeds and cost basis from the 1099B would still be entered in the investment sales section, but the market discount amount gets reported separately as interest.

I ran into this exact same problem last year with some T-Bills I was trading. After hours of research and getting nowhere, I finally used taxr.ai (https://taxr.ai) to analyze my 1099B and figure out exactly how to report it. Their AI actually explained the split reporting needed for accrued market discount and showed me examples of how to fill out the forms correctly. The tool basically confirmed what Profile 5 is saying - you have to report the market discount as interest income on Schedule B, not as part of your capital gain/loss calculation. I was getting so frustrated trying to figure this out until I uploaded my forms and got a clear explanation. Their system even pointed out a small reporting error my broker had made on the 1099B that I wouldn't have caught otherwise.

Just wanted to update that I tried taxr.ai after seeing it mentioned here. Honestly it was really helpful with my bond taxation questions! I uploaded my 1099s and it immediately identified my market discount issues and clarified how they should be reported. For my situation, I had both OID and market discount on different bonds, and the tool correctly separated how each should be treated. It even generated a nice report explaining the tax treatments that I could share with my accountant. He was impressed and said it saved him research time. What I found most helpful was how it explained the differences between the various types of bond income and discounts in plain English. It also showed exactly which boxes on which forms relate to each type of income. Money well spent considering how many hours of frustration it saved me!

If you're still having trouble with the IRS guidance on this, you might want to call them directly. I tried for 3 weeks to get someone on the phone at the IRS to explain how to handle market discount on T-bills and kept getting disconnected after holding for 2+ hours. I finally used Claimyr (https://claimyr.com) to get through to an actual human at the IRS. You can see how it works in this video: https://youtu.be/_kiP6q8DX5c. They basically hold your place in line and call you when an agent picks up. The IRS representative confirmed exactly what others have said here - accrued market discount gets reported as interest income on Schedule B. The nice thing about having an actual IRS person confirm it was that I got their badge number, so if there's ever an audit question, I have documentation that I followed their guidance. Definitely worth it for peace of mind on these confusing tax situations.

I have to eat my words and apologize for being skeptical. After my accountant made a mistake on my T-Bill market discount reporting last year that resulted in a CP2000 notice, I finally broke down and tried Claimyr to talk directly to the IRS about how to correctly report it this year. Got through to an agent in about 45 minutes (after previous attempts where I personally waited on hold for 2+ hours and eventually gave up). The agent walked me through exactly how to report T-Bill market discount on Schedule B vs the regular proceeds/basis on Schedule D. They confirmed that accrued market discount must be reported as interest income, separate from the capital gain/loss calculation. Having direct confirmation from the IRS has given me peace of mind that I'm doing it correctly this time. Sometimes you have to admit when you're wrong, and I was definitely wrong about Claimyr. Sorry for the skepticism!

Here's another important detail that hasn't been mentioned yet - you need to check if your broker is using the constant yield method or straight-line method for calculating the accrued market discount. The calculation method can affect the amount of interest income you report. Most brokers use straight-line by default, but you can elect to use constant yield (which is slightly more favorable typically). This election must be made on your tax return in the year you acquire the debt instrument. If you've already been reporting other bonds a certain way, you should maintain consistency. Also, if you're dealing with a lot of these transactions, consider downloading IRS Publication 550 which has a whole section on market discount rules. The T-Bill rules are a bit different from corporate bonds.

Has anyone had this issue with multiple T-Bills across different brokers? I'm getting inconsistent reporting with some showing market discount on 1099-INT and others on 1099B. Super confused about how to reconcile these.

This is exactly the kind of confusing tax situation that trips up so many people! I went through something similar with Treasury securities last year. One thing that helped me was keeping a detailed spreadsheet of all my bond transactions with acquisition dates, sale dates, and the specific reporting each broker provided. The key insight that finally clicked for me was understanding that the IRS treats market discount as "interest that should have been earned" rather than a capital gain. That's why it gets reported as interest income on Schedule B even though it shows up on your 1099B form. For anyone dealing with this regularly, I'd also recommend setting up a separate folder just for bond-related tax documents. Between 1099-INT forms, 1099B forms, and all the supplementary broker statements explaining their calculations, it can get overwhelming fast. Having everything organized by security type and date makes tax time much less stressful. The good news is once you understand the pattern, it becomes much easier to spot and handle correctly in future years!

Thank you all for this incredibly detailed discussion! As someone who's been hesitant to trade T-Bills because of the tax complexity, this thread has been a goldmine of practical information. I especially appreciate how you've covered everything from the basic tax treatment (market discount as interest income on Schedule B) to the more advanced strategies like the de minimis election and constant yield method. The step-by-step TurboTax instructions are particularly valuable. One thing I'm curious about - for those of you who are actively trading T-Bills, do you find it's still worth it after factoring in all this additional tax complexity? I'm wondering if the potential returns justify the extra record-keeping and form preparation time, especially for smaller position sizes. Also, has anyone run into issues during an IRS audit related to T-Bill market discount reporting? I'm always nervous about these more complex tax situations and whether having all the right documentation would be sufficient if questions ever came up.

This has been such an educational thread! I'm a relatively new member here but have been struggling with similar T-Bill taxation issues. Reading through everyone's experiences and solutions has been incredibly helpful. I wanted to share that I also ended up using one of the tools mentioned here (taxr.ai) after getting completely stuck on a market discount situation with multiple T-Bills from different brokers. Like others mentioned, the AI analysis was spot-on and saved me hours of research. It correctly identified which amounts should be reported as interest income vs capital gains, and even caught an error in one of my broker's calculations. What I found most valuable was how it explained the reasoning behind each treatment with specific IRS code references. This gave me confidence that I was reporting everything correctly, and my CPA was actually impressed with the detailed analysis when I shared it with him. For anyone still on the fence about these tools or methods, I'd say the peace of mind is worth it. Tax mistakes on investment income can be costly, especially if they trigger notices or audits later. Having proper documentation and following established IRS guidance (like the market discount = interest income rule discussed here) is definitely the way to go. Thanks to everyone who shared their knowledge and experiences in this thread - it's made a complex topic much more manageable!