12c IRS Letter - What does this 12c letter mean and what should I do?
I hired a CPA to handle several past due tax returns and just received this weird letter from the IRS labeled as 12c. I'm totally confused about what this means. The letter states: "Schedule 1 is incomplete or missing from your return. Complete the schedule with information that supports $1,250 on line 8 form 1040. Also attach all supporting forms or schedules as required." I'm really freaking out now... did my CPA mess up my returns? The CPA initially estimated my back taxes at around $1,200 for 3 years of unfiled returns, but the IRS has already sent me a bill for $2,000 just for ONE YEAR! I'm seriously stressing about this. Has anyone dealt with a 12c letter before? What does this actually mean and what do I need to do now?
24 comments


Victoria Brown
That 12c letter is basically the IRS saying they need more information about income you reported. The "12c" is just the letter code that tells you what kind of request it is. What's happening is the IRS sees an amount on line 8 of your 1040 (which is "Other Income"), but they don't see the supporting Schedule 1 that explains where that income came from. When you report "Other Income" on your tax return, you need to provide details about what kind of income it is using Schedule 1. Your CPA likely made an error by either not including Schedule 1 or not completing it properly. It's not necessarily a huge deal, but you need to respond. Contact your CPA immediately since they prepared the return - they should fix this for you at no additional cost. They'll need to complete Schedule 1 properly and send it back to the IRS with a copy of the letter.
0 coins
Laura Lopez
•Thanks for explaining. Do you think this is why the IRS bill is so much higher than what my CPA estimated? And how long do I typically have to respond to something like this?
0 coins
Victoria Brown
•The higher bill could be related to this missing information, but it might also be due to other factors. Without the proper Schedule 1, the IRS might be calculating your tax based on incomplete information, which often leads to higher assessments. They may not be applying deductions or credits you're entitled to. You usually have 30 days from the date on the letter to respond. Don't delay - contact your CPA immediately and get this handled. If you need more time, you can call the number on the letter and request an extension, but it's better to address it promptly.
0 coins
Samuel Robinson
I had almost the exact same issue last year with a 12c letter! I used https://taxr.ai to help me understand what was going on with my return. I uploaded the letter and my tax documents, and it explained everything in plain English. The system showed me that my accountant had recorded some contract income on the wrong line without the proper supporting schedule. It basically translated all the IRS jargon and showed me exactly what was missing. I was able to fix it myself instead of paying my accountant more money to correct their mistake.
0 coins
Camila Castillo
•Does this actually work with IRS letters? I've got a different notice (CP2000) and I'm trying to figure out if I need to hire someone or can handle it myself.
0 coins
Brianna Muhammad
•I'm kinda skeptical about these online tools. How does it compare to just calling the IRS directly? I've always found that talking to an actual person is more reliable than some algorithm trying to interpret tax codes.
0 coins
Samuel Robinson
•Yes, it absolutely works with IRS letters! I uploaded my CP12 and CP2000 notices and it explained everything perfectly. It analyzes the specific language in your notice and tells you exactly what the IRS is asking for and why. For your CP2000, it would show you what income the IRS thinks you didn't report and help you determine if they're right or wrong. As for calling the IRS directly, good luck with that! I spent hours on hold last year and never got through. With taxr.ai, I got answers in minutes instead of days. It's not just an algorithm - it actually breaks down what's happening with your specific situation and guides you through the next steps.
0 coins
Camila Castillo
Just wanted to update that I tried taxr.ai after seeing the recommendation here, and it was super helpful with my CP2000 notice! It showed me that the IRS was double-counting some income that was reported on both a 1099-K and a 1099-MISC. The system helped me draft a response letter explaining the situation with references to the right tax rules. I was prepared to pay an accountant $500+ but ended up handling it myself. Definitely worth checking out if you've got an IRS notice you don't understand!
0 coins
JaylinCharles
If you're having trouble reaching your CPA or need to talk to the IRS directly about this 12c letter, I'd recommend using https://claimyr.com to get through to an actual IRS agent. I wasted DAYS trying to get through to the IRS about a similar issue, and their callback system never worked for me. With Claimyr, I got through to an actual IRS agent in about 45 minutes instead of spending hours on hold. They held my place in line and called me when an agent was available. You can see how it works here: https://youtu.be/_kiP6q8DX5c The IRS agent I spoke with was actually really helpful and explained exactly what I needed to do to fix my issue without penalties. Definitely worth it for the peace of mind alone.
0 coins
JaylinCharles
•It uses their proprietary system to navigate the IRS phone tree and secure your place in line. It's not just auto-dialing - they have technology that interacts with the IRS phone system and holds your spot. When an agent becomes available, you get a call connecting you directly to that person. I was skeptical too until I tried it. No, it's definitely not a scam. They don't put you at the "front of the line" - you still wait your turn, but their system waits for you instead of you having to stay on hold. I spent days trying to get through on my own with no luck. With Claimyr, I was speaking with an actual IRS agent within an hour. They don't claim to have special IRS connections - they just have technology that makes the existing system work better for regular people.
0 coins
Eloise Kendrick
•How does this actually work? Does it just auto-dial the IRS for you or something? I'm confused about how a third-party service could get you through the IRS phone system faster.
0 coins
Brianna Muhammad
•This sounds like a scam to me. There's no way some random service can magically get you to the front of the IRS phone line when millions of people are trying to call. They're probably just taking your money and putting you on hold the same as anyone else would be.
0 coins
Laura Lopez
•0 coins
Brianna Muhammad
I have to admit I was completely wrong about Claimyr. After posting my skeptical comment, I decided to try it because I was desperate to resolve a tax notice issue. I couldn't believe it actually worked! I had been trying for TWO WEEKS to get through to the IRS with no luck. Using Claimyr, I got a call back in about 30 minutes and was connected to an actual IRS representative who helped resolve my issue on the spot. They explained that my 12c letter was due to missing documentation and helped me understand exactly what I needed to send in. Saved me from potentially paying hundreds in penalties. I'm seriously impressed and wanted to come back and correct my earlier comment.
0 coins
Lucas Schmidt
To clarify about the 12c letter - it's specifically asking about line 8 on your 1040, which is "Other Income." This could be gambling winnings, jury duty pay, prizes/awards, or other miscellaneous income. The IRS is saying you reported an amount there but didn't include the required Schedule 1 to explain what type of income it is. It sounds like your CPA made a simple error by not including this schedule. The much higher bill might be because: 1. The IRS doesn't know what kind of income this is, so they can't apply the right tax treatment 2. You might be missing deductions that would offset this income 3. There could be penalties and interest added for the late filing Call your CPA immediately - fixing this is their responsibility since they prepared the return!
0 coins
Freya Collins
•Can the IRS actually penalize you for a missing schedule if you reported the income amount correctly? Seems unfair if the dollar amount was right but just missing the supporting form.
0 coins
Lucas Schmidt
•The IRS typically won't penalize you specifically for just a missing schedule if the income amount was correctly reported on the main form. However, without the schedule, they can't properly determine how that income should be taxed, which might result in them calculating your tax at a higher rate. The penalties and interest I mentioned are more likely related to the late filing of the returns overall, not specifically the missing schedule. When you file past due returns, the IRS generally adds both failure-to-file and failure-to-pay penalties, plus interest on the unpaid amount. Your CPA should have factored these into their estimate, but sometimes they underestimate these amounts.
0 coins
LongPeri
Don't panic! I've gotten a 12c letter before and it's not that scary once you understand it. The letter is just asking for an explanation of that "other income" amount. Quick question though - did your CPA give you a copy of the return they filed? You should be able to see if Schedule 1 was included. If you have it, just send a copy of that schedule with a letter referencing your 12c notice. If not, ask your CPA for it.
0 coins
Oscar O'Neil
•This is good advice. Also, I'd recommend keeping a detailed record of all communications with your CPA about this issue. If they made an error that ends up costing you in penalties or interest, you might be able to ask them to cover those costs since it was their mistake.
0 coins
Haley Stokes
I went through something very similar with a 12c letter last year! The key thing to remember is that this is usually a simple fix, not a major problem. The IRS just needs clarification on that $1,250 "other income" amount. Here's what I'd recommend doing immediately: 1. Contact your CPA right away - they should handle this correction at no extra charge since it was their oversight 2. Ask for copies of ALL the returns they filed for you so you can see what was actually submitted 3. The 30-day response deadline is firm, so don't wait Regarding the higher-than-expected tax bill, this could be happening because: - Without Schedule 1, the IRS might be treating your "other income" as subject to self-employment tax - They may not be applying deductions you're entitled to - Late filing penalties and interest are probably included The good news is that once you provide the missing Schedule 1, the IRS will recalculate everything properly. I actually ended up owing less than my original CPA estimate once everything was sorted out. Don't stress too much - this is more common than you think!
0 coins
Freya Christensen
I just want to add some reassurance here - I've been through multiple IRS notices over the years, and the 12c letter is actually one of the easier ones to resolve. It's basically just a paperwork issue, not an accusation of wrongdoing. The fact that your CPA estimated $1,200 for 3 years but the IRS is billing $2,000 for one year suggests there might be more going on than just the missing Schedule 1. When you contact your CPA (which you should do TODAY), ask them to walk you through exactly what income sources they reported and how they calculated the tax liability. Also, don't let this experience discourage you from getting compliant with your taxes. Even if your CPA made some errors, you're still way better off having filed those returns than continuing to ignore them. The IRS is generally reasonable to work with when you're making a good faith effort to comply. One last tip: if your CPA is unresponsive or unhelpful about fixing their mistake, consider getting a second opinion from another tax professional. You shouldn't have to pay twice for the same work to be done correctly.
0 coins
Collins Angel
•This is really helpful advice! I'm new to dealing with IRS issues and honestly feeling pretty overwhelmed. The idea that this is just a paperwork issue rather than something more serious is reassuring. I'm definitely going to call my CPA first thing tomorrow morning and demand they walk me through everything they filed. You're absolutely right that I shouldn't have to pay twice for work that wasn't done correctly the first time. Thanks for the encouragement about getting compliant - I was starting to regret even trying to catch up on my taxes!
0 coins
Amara Okafor
I went through this exact same situation about 6 months ago! Got a 12c letter asking for Schedule 1 to support some "other income" I had reported. Turns out my tax preparer had included the income amount on line 8 but completely forgot to attach the actual Schedule 1 form that explains what type of income it was. The good news is this is totally fixable and not as scary as it seems. Here's what worked for me: 1. I called my tax preparer immediately (don't wait!) and they admitted the mistake 2. They prepared the missing Schedule 1 at no charge since it was their error 3. I mailed it to the IRS with a copy of the 12c letter within 2 weeks 4. About 6 weeks later, I got a letter saying the matter was resolved The key thing is responding quickly - you typically have 30 days from the letter date. Don't let your CPA brush this off or charge you extra fees to fix their own mistake. As for the higher-than-expected bill, that's probably because the IRS can't properly calculate your tax without knowing what type of "other income" it is. Some types are taxed differently than others, and without the schedule, they might be defaulting to the highest tax treatment. Once you provide the missing form, they should recalculate everything correctly. You've got this! It's just a paperwork hiccup, not a major tax problem.
0 coins
NeonNinja
•Thank you so much for sharing your experience! This is exactly what I needed to hear. I've been losing sleep over this 12c letter thinking I was in serious trouble with the IRS. Knowing that you went through the same thing and it was resolved in just 6 weeks is such a relief. I'm definitely calling my CPA first thing in the morning and making sure they understand this was their mistake to fix. Your point about the IRS possibly defaulting to the highest tax treatment makes perfect sense - that would explain why my bill is so much higher than expected. I really appreciate you taking the time to walk through the exact steps you took. It gives me a clear roadmap to follow!
0 coins