IRA Strategy Question: Avoiding Pro Rata Rule for Future Backdoor Roth

[bhJogdt]

Hello, I’m looking for help with my current IRA situation involving both pre-tax and after-tax contributions.

I have about $80k in my IRA. Over the past two years (2023 and 2025), I made after-tax contributions that are now mixed with pre-tax funds. I didn’t realize at the time that the pro rata rule would apply when converting to a Roth IRA.

I also now have a 401(k), so I’m considering rolling about $65k  into the 401(k) and leaving $15k in the IRA. Then I would convert that $15k to a Roth IRA to effectively empty the IRA.

My questions:

• Will this strategy create any tax issues?
• Does this approach help avoid the pro rata rule going forward?
• Starting in 2026, I plan to do backdoor Roth contributions—does this setup make sense for that?

I’d appreciate any guidance or concerns. Thank you!

[DaveF1006 · Accepted solution]

This sounds like a good strategy.  Here are some things to consider before you execute your plan.

1. Will this strategy create any tax issues?

If executed correctly, this should not create a major tax bill, but there is a specific order of operations you must follow:

1. You cannot roll after-tax money into a 401(k). Most 401(k) plans are only allowed to accept pre-tax rollovers. You must ensure that the $65k you move into the 401(k) consists only of your pre-tax contributions and any earnings. 
2. The "Basis" stays behind. Your after-tax contributions (your "basis") must stay in the IRA. When you convert that remaining $15k to a Roth IRA, only the portion that exceeds your basis (any growth on those after-tax funds) will be taxable.
3. Form 8606 is your best friend. You must have filed Form 8606 for 2023 and 2025 to track those after-tax contributions. When you do the conversion, you’ll use this form again to show the IRS that the $15k you converted was already taxed.

2. Does this approach help avoid the pro-rata rule?

Yes. The pro-rata rule only aggregates "Traditional" IRAs (including SEP and SIMPLE IRAs). It specifically excludes qualified employer plans like 401(k)s.

By moving the $65k of pre-tax money into your 401(k) before December 31, 2026, your "Total IRA Balance" for the pro-rata calculation will only be the $15k remaining in the IRA. Since that $15k is almost entirely after-tax basis, the "taxable ratio" of your conversion drops significantly.

3. Does this setup make sense for 2026 Backdoor Roths?

Yes. This is the "cleanest" way to set yourself up for recurring Backdoor Roth contributions.

1.  Once you convert that $15k and effectively empty your Traditional IRA, your balance at the end of the year will be $0.
2.  In 2026, you can contribute the maximum ($7,500, or $8,500 if you're 50+) as a non-deductible contribution to your Traditional IRA and immediately convert it to Roth. Since there's no pre-tax money left in any IRA to "taint" the conversion, the process becomes a simple, tax-free transfer.

4. Crucial Checklist for Success:

1. Check with your 401(k) provider: Verify that your specific plan allows "roll-ins" from a Traditional IRA. Not all plans do.
2. Verify the Basis: Look at your most recent Form 8606 to find your exact "Total Basis." If your after-tax contributions were $13k and the account grew to $15k, you will owe taxes on that $2k difference when you convert.
3. The Dec 31 Deadline: The 401(k) rollover must be completed and your IRA balance reduced by December 31 of the year you perform the Roth conversion. If the money is still in the IRA on New Year's Eve, the pro-rata rule will catch you.

[bhJogdt]

Ok, thanks for the explanation.

 When I roll over the $65K pre-tax amount and leave $15K, which I then convert to a Roth, Form 8606 will take care of this — that makes sense.

A few other questions came across:

1. If I complete this transaction before December 31 and effectively empty my IRA account, do I need to wait until January 2026 to do a backdoor Roth for 2026, or can I do it right after completing this?
2. For a backdoor Roth, how long do I need to keep the money in the traditional IRA before converting it to Roth?
3. On the tax return for 2026, do I just report the traditional IRA contribution? If I do a backdoor Roth, will the tax documents essentially net to zero (e.g., $8,600 after tax contribution and $8,600 conversion resulting in no tax)?

Also, I have a SEP IRA. Is it allowed  to roll the $65K into the SEP IRA instead of 401k? Is that even possible? And does having a SEP IRA create any issues for doing a backdoor Roth?

[DanaB27]

1. You could do a backdoor Roth right after you moved the pre-tax funds to your 401k since all that matters for Form 8606 is the value of all traditional IRA on December 31. You can perform the backdoor Roth procedure without pro-rata issues as long as you do not have any pre-tax funds in any of your traditional, SEP, and SIMPLE IRAs at the end of the year.
2. You do not need to wait. It is best to convert it right away to avoid taxable gains.
3. You will report the nondeductible traditional IRA contribution and the conversion, if done in 2026 (Form 1099-R). Please see How do I enter a backdoor Roth IRA conversion?  If you convert right away and have no gains then this will result in no tax.

No, you cannot use the SEP IRA instead of the 401k since Form 8606 is asking to include the value of all your traditional IRAs as of December 31. This includes traditional SEP IRA (IRS). Therefore, having a balance in a SEP IRA can also cause issues for the backdoor Roth procedure.

[bhJogdt]

So, does having a balance in a SEP IRA also cause problems when doing a backdoor Roth? I’m a bit confused.

 Here are the accounts I currently have at Fidelity:

• Rollover IRA – has a balance (as mentioned earlier)
• Roth IRA – has some balance
• SEP IRA – has a balance

Do I need to empty the SEP IRA as well, in addition to the Rollover IRA, in order to do a backdoor Roth?

I also have an HSA with some balance.

Thank you.

[DaveF1006]

Yes, you’ll need to empty the SEP IRA too as well as the rollover IRA. The IRS “Pro-Rata Rule” treats all your Traditional IRAs as one big account, not separately.  Here is a summary of how to proceed. 

1. Check with your 401(k) provider: Confirm they accept rollovers from both Rollover IRAs and SEP IRAs. 
2. Move the pre-tax balances: Move both the $65K and the SEP balance to the 401(k).
3. The "Last Man Standing": Leave only your after-tax basis in the Traditional/Rollover IRA.
4. Convert: Move that remaining amount to your Roth IRA.
5. Verify: Ensure all non-Roth IRA accounts hit $0 by December 31.

None of this will affect your HSA. Health Savings Accounts are governed by different sections of the tax code and are not included in the pro-rata calculation for IRA conversions. You can leave that balance exactly where it is.