Help understanding new Form 1040 lines 4a and 4b for IRA and Roth IRA conversions
I'm getting totally different answers from people about how to fill out the new Form 1040 for my retirement account moves. Really hoping someone who's done this can help! So here's my situation: I had two 401(k)s from previous jobs that I rolled over into traditional IRAs - one was about $19,500 and the other was around $25,000. Both 1099-Rs have code G in box 7. Then I decided to convert one of them (the $19,500 one) to a Roth IRA, and that 1099-R has code 2 in box 7. What's confusing me is what numbers go where on lines 4a and 4b of the new 1040. Some people are telling me I need to put $19,500+$25,000+$19,500 = $64,000 on line 4a and $19,500 on line 4b. But others say I should put $19,500+$25,000 = $44,500 on line 4a and $19,500 on line 4b. The old 1040 had separate lines (15 and 16) which made way more sense! But now everything's combined into line 4 and I'm completely confused. It seems weird to count that $19,500 twice on line 4a (once for rollover, once for conversion). That doesn't make sense to me. Has anyone actually filed this correctly? I'd really appreciate some solid advice from someone who understands the new 1040 rules. Thanks!
24 comments


Isla Fischer
The correct approach is to report $44,500 on line 4a and $19,500 on line 4b. Here's why: Line 4a should include the total distributions you received from all IRAs, which are your two 401(k) rollovers ($19,500 + $25,000 = $44,500). You don't count the Roth conversion as a separate distribution since it's already included in the original $19,500 distribution. Line 4b is for the taxable portion, which is just the $19,500 you converted to a Roth IRA. The direct rollovers from 401(k) to traditional IRA (code G) aren't taxable, but the conversion to Roth IRA (code 2) is taxable because you're moving pre-tax money into a post-tax account. The confusion comes from the form consolidation, but the IRS doesn't want you double-counting the same money on line 4a. Think of it as tracking the money's path: the $19,500 came from a 401(k), went to traditional IRA, then to Roth. It's still just $19,500 moving through different accounts.
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Miles Hammonds
•But what if I didn't do the rollover and Roth conversion in the same year? Like if I did 401k to trad IRA in 2024 but don't convert to Roth until 2025... would it change how I report it? Also, does it matter which 401k money I converted? Like if I had multiple rollovers over the years and then convert some of that money, how does the IRS know which specific dollars were converted?
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Isla Fischer
•If you did the rollover in 2024 and the Roth conversion in 2025, you'd report only the rollover on your 2024 return (with $44,500 on line 4a and $0 on line 4b since rollovers aren't taxable). Then in 2025, you'd report just the Roth conversion ($19,500 on both lines 4a and 4b). The IRS doesn't track which specific dollars were converted. They use what's called the "aggregation rule" - all your traditional IRA money is treated as one pool regardless of when or how it was contributed. So if you convert part of your traditional IRA to Roth, the IRS doesn't care which specific contribution or rollover those dollars came from.
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Ruby Blake
I've been dealing with the same headache figuring out these IRA reporting rules. I was getting nowhere until I tried https://taxr.ai which actually solved this exact issue for me. I uploaded my 1099-Rs and it automatically figured out the correct reporting for lines 4a and 4b. What was really helpful is that it explained WHY I needed to report it as $44,500 on line 4a and $19,500 on line 4b - exactly what the first commenter said. The system showed me that I don't double-count the distribution that was later converted. It also pulled the code G and code 2 info from my forms and used that to determine the taxable amount. I honestly thought I was going crazy with all the conflicting advice until I found this tool.
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Micah Franklin
•Does it work with other retirement accounts too? I've got a 403b rollover and a SEP IRA distribution this year and I'm completely lost on how to report everything.
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Ella Harper
•I'm kinda skeptical about tax tools that aren't like the big names. How sure are you that it's getting everything right? Last thing I need is an audit because some random website gave me the wrong advice.
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Ruby Blake
•Yes, it works with all retirement accounts - 401k, 403b, SEP IRA, SIMPLE IRA, etc. I had a similar situation with a 403b rollover last year and it handled it perfectly. The system knows the specific reporting rules for each type of retirement account. I totally understand being skeptical about new tax tools. What convinced me was that they have tax professionals who review everything. I was hesitant too, but it matched exactly what my accountant friend told me was correct, and they explained each step of the calculation. The big-name tax software actually got this wrong for me last year and I had to file an amended return.
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Micah Franklin
Just wanted to update after trying taxr.ai for my complicated retirement situation. I was definitely reporting my IRA distributions wrong before! I had a 403b rollover, a traditional IRA distribution, and a Roth conversion all in the same year. The tool explained that I should only count each actual distribution once on line 4a (not counting the same money again when it moves between IRAs), and only the taxable portion on line 4b. It even caught that part of my traditional IRA had non-deductible contributions from previous years (from my Form 8606), which reduced the taxable amount of my Roth conversion. My previous tax software missed this completely and would have had me paying extra tax. Definitely recommend it for anyone dealing with these retirement account reporting headaches!
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PrinceJoe
If anyone's still confused about this IRA reporting (like I was), you might also want to try calling the IRS directly to get an official answer. I know it sounds impossible to reach them, but I used https://claimyr.com and got through to an IRS agent in about 15 minutes. You can see how it works in this video: https://youtu.be/_kiP6q8DX5c I was in a similar situation with multiple rollovers and conversions, and the agent confirmed exactly what others are saying here - you only count the actual distributions on line 4a, not the subsequent movements between IRAs. The agent also explained that the codes in box 7 of your 1099-R are what determine if something goes on line 4b (taxable) or not. It was worth getting that peace of mind from an official source before filing.
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Brooklyn Knight
•How much did that cost? Seems weird to pay just to talk to the IRS when they're supposed to be helping taxpayers for free.
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Owen Devar
•Does this actually work? I've literally spent HOURS on hold with the IRS and never got through. If this really works I'd do anything to avoid that nightmare again.
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PrinceJoe
•There is a fee, but considering I spent over 3 hours on hold previously and never got through, it was worth it to me. I can't discuss the exact cost here, but the peace of mind was worth it for my complicated tax situation. They're not charging for IRS advice - they're charging for the service of navigating the phone system and waiting on hold for you. Yes, it absolutely works! That was my exact experience too - hours of hold music and disconnections. With Claimyr, I put in my number, they called me when they had an IRS agent on the line, and I just picked up and started talking. Saved me so much frustration. The agent was super helpful with my IRA questions and even explained some other deductions I qualified for.
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Owen Devar
Just had to come back and say THANK YOU to whoever mentioned Claimyr. I was super skeptical but I was desperate after trying to call the IRS four separate times about my IRA rollover question. I used their service yesterday, and they actually called me back with an IRS agent on the line in about 20 minutes! The agent confirmed everything about the 4a/4b reporting that people mentioned here - you don't double count the money that moves from traditional to Roth IRA. She also helped me understand how to report some basis I had in my traditional IRA that I didn't even know about. Turns out I was about to overpay my taxes by almost $2,000 because I didn't understand the pro-rata rule for partial Roth conversions. For anyone stuck on complex IRA questions, getting the answer straight from the IRS was totally worth it!
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Daniel Rivera
I just went through this exact scenario last month! The correct answer is $44,500 on line 4a and $19,500 on line 4b. I mistakenly reported it the other way at first ($64,000 on line 4a) and had to file an amended return. My tax professional explained that the issue is that the $19,500 that was converted to Roth wasn't a new distribution - it was just moving money that was already distributed from the 401k. Think of it like this: - You had two distributions from 401ks ($19,500 and $25,000) - The Roth conversion wasn't a new distribution from an IRA - it was just moving money between accounts that was already counted in the $19,500 I learned this the hard way by having to amend my return!
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Sophie Footman
•Did you get hit with any penalties for reporting it incorrectly the first time? I'm worried because I already filed and might have done it wrong.
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Daniel Rivera
•No penalties at all. Since the taxable amount (line 4b) was correct at $19,500 in both scenarios, I didn't owe any additional tax. The IRS is mainly concerned with you reporting the correct taxable amount. If your line 4b is correct, you should be fine. That said, it's better to have an accurate return. If you're worried, you can file Form 1040-X to amend. But truthfully, since it doesn't change your tax liability, it's unlikely the IRS would flag it.
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Connor Rupert
One thing nobody mentioned yet is that you should also be filing Form 8606 if you did a Roth conversion. That form tracks your basis in traditional IRAs and calculates the taxable portion of distributions and conversions. If you've ever made non-deductible contributions to traditional IRAs in the past, then part of your conversion might not be taxable. The 8606 would help you figure out what portion is actually taxable.
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Molly Hansen
•This is super important! I made non-deductible contributions for years when I was over the income limit. When I did my Roth conversion, only about 70% was actually taxable. Would have massively overpaid without Form 8606.
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Harmony Love
This is such a helpful thread! I was making the same mistake as Daniel - about to report $64,000 on line 4a because I thought I needed to count the conversion as a separate distribution. The key insight that finally clicked for me is that a Roth conversion isn't really a "distribution" from your IRA - it's just moving money from one type of IRA to another. The actual distribution was when the money came out of your 401(k)s originally. So you're right: $44,500 on line 4a (the two 401k rollovers) and $19,500 on line 4b (the taxable conversion amount). The IRS instructions could definitely be clearer about this! One question though - if I did multiple small conversions throughout the year instead of one big one, would I still add up all the conversion amounts for line 4b? Or does each conversion get reported separately somewhere?
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Fidel Carson
•You'd add up all the conversion amounts for line 4b! Each individual conversion doesn't get reported separately on the 1040 - you just total them all up. So if you did say 3 conversions of $6,500 each throughout the year, you'd put $19,500 on line 4b (assuming they were all taxable). The individual conversions will show up on separate 1099-R forms, but for reporting purposes on your 1040, you combine them. This is actually one of the nice things about the new consolidated line 4 - it simplifies the reporting even when you have multiple transactions. Just make sure you keep all those 1099-Rs with your tax records in case the IRS ever wants to see the breakdown of how you got to your totals!
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Zara Malik
This thread has been incredibly helpful! I've been struggling with the exact same situation and was getting conflicting advice from different sources. The explanation about not double-counting the $19,500 on line 4a finally makes sense to me. I was also thinking I needed to report it as $64,000, but you're absolutely right - the Roth conversion isn't a new distribution, it's just moving already-distributed money between account types. What really helped me understand it was thinking about the money flow: 401(k) → Traditional IRA → Roth IRA. The actual "distribution" happened when it left the 401(k), not when it moved from Traditional to Roth. I'm definitely going to double-check my Form 8606 too after Connor's comment. I think I may have made some non-deductible contributions a few years back when my income was higher, which could reduce my taxable conversion amount. Thanks everyone for sharing your experiences - this is exactly the kind of real-world advice that's so hard to find in the IRS publications!
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Emily Nguyen-Smith
•I'm so glad this thread exists! I was literally pulling my hair out trying to figure this out. I've been staring at my 1099-Rs for weeks and getting more confused every time I tried to research it online. The money flow explanation really clicked for me too - 401(k) → Traditional IRA → Roth IRA. When you think about it that way, it's obvious that the conversion isn't creating new taxable income, it's just changing the tax treatment of money that was already distributed. I actually called my old 401(k) provider thinking I was missing some forms, but they confirmed I only get 1099-Rs for the actual distributions out of the 401(k), not for the subsequent IRA-to-IRA movements. Now I just need to dig through my old tax returns to see if I ever made non-deductible IRA contributions. Fingers crossed I can reduce that taxable amount on line 4b!
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GalacticGladiator
This has been such a lifesaver of a thread! I was in almost the identical situation - had a 401k rollover to traditional IRA followed by a Roth conversion, and I was getting completely different answers from everyone I asked. What finally made it click for me was the money flow explanation that several people mentioned: the $19,500 only gets counted once on line 4a because it's the same money moving through different account types, not separate distributions. So it's definitely $44,500 on line 4a (both 401k rollovers) and $19,500 on line 4b (just the taxable conversion). I also want to echo what Connor said about Form 8606 - this is crucial if you've ever made non-deductible IRA contributions! I almost missed this and would have overpaid my taxes significantly. If you have any after-tax basis in your traditional IRA from previous non-deductible contributions, it reduces the taxable portion of your Roth conversion using the pro-rata rule. For anyone still confused, I'd recommend double-checking your old tax returns for Form 8606 filings - if you see any, you probably have basis that could save you money on this conversion!
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Grace Johnson
•This whole discussion has been incredibly enlightening! I'm a newcomer to this community but found myself in a very similar situation this tax season. I had rolled over my old 403(b) into a traditional IRA and then did a partial Roth conversion, and I was completely lost on the reporting. The money flow concept that everyone keeps mentioning really helped me understand why we don't double-count on line 4a. It's such a simple way to think about it - the distribution happened when money left the original retirement account, not when it moved between IRA types. What really caught my attention was the discussion about Form 8606 and non-deductible contributions. I think I may have made some of those back when my income exceeded the deduction limits, but honestly I'm not even sure where to look for that information. Would those show up on my old 1040s, or do I need to dig through other paperwork? Thanks to everyone who shared their experiences - as someone new to dealing with these complex retirement account moves, this real-world advice is invaluable!
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