A Roth IRA lets your retirement savings grow and be withdrawn tax-free by using after-tax contributions.
High earners who exceed the IRS Roth IRA limits employ a popular strategy: the backdoor Roth IRA. This involves putting after-tax dollars into a traditional IRA and then converting those funds to a Roth IRA.
This is where the pro-rata rule comes in. This rule is one of the most misunderstood and crucial aspects of the backdoor Roth IRA strategy. So, does the pro-rata rule apply if you have after-tax dollars in a 401(k), but none in any of your IRAs?
The short answer is no, it does not.
Understanding the Pro-Rata Rule
The pro-rata rule is a calculation used to determine the taxability of a Roth conversion. It states that if you have pre-tax and after-tax (non-deductible) dollars mixed together in your traditional IRAs (including SEP and SIMPLE IRAs), you cannot simply pick and choose which dollars to convert.
Instead, any conversion you make is treated as a proportionate mix of your pre-tax and after-tax funds, based on the total balance of all your non-Roth IRAs.
Suppose your traditional IRA contains $80,000 in pre-tax and $20,000 in after-tax contributions. If you convert $10,000 to a Roth IRA, you can't just use the after-tax portion.
Because 80% of your IRA is pre-tax, the pro-rata rule dictates that 80% ($8,000) of your conversion will be taxable, while only 20% ($2,000) will be tax-free. This can lead to an unexpected tax bill.
401(k) After-Tax Dollars are a Different Story
The important point about the pro-rata rule is that it only takes into account your traditional, SEP, and SIMPLE IRAs when determining the taxability of a Roth conversion. Any after-tax dollars you have in a 401(k), 403(b), or other employer-sponsored retirement plan are excluded from this calculation. Even if you have a large after-tax balance in your 401(k) from using a 'mega backdoor' Roth strategy, these assets do not affect the pro-rata calculation for your IRAs. This means the IRS does not consider your 401(k) balances when applying the pro-rata rule to a backdoor Roth IRA conversion.
So, if you have:
- Zero after-tax dollars in any of your traditional, SEP, or SIMPLE IRAs
- A substantial after-tax balance in your 401(k)
You can proceed with a backdoor Roth IRA contribution and conversion without being subject to the pro-rata rule. The funds you convert will come from a traditional IRA with a zero after-tax basis, making the conversion of your contribution entirely tax-free.
It's also worth noting that this same principle applies to inherited IRAs. While an inherited IRA may have its own pro-rata rule, it is not factored into the pro-rata calculation for your personal IRAs.
The Bottom Line
The pro-rata rule is key for backdoor Roth IRAs. Remember, it applies only to your personal IRAs. Understanding the difference between after-tax dollars in a 401(k) and an IRA is essential for retirement planning.
Consult our financial advisors at Dixon Financial Group, LLC, to ensure your decisions comply with the rules and serve your unique needs. Jacob and I can offer clarity to this very murky topic. Call us today, 702.982.2479.
Traditional IRA account owners have considerations to make before performing a Roth IRA conversion. These primarily include income tax consequences on the converted amount in the year of conversion, withdrawal limitations from a Roth IRA, and income limitations for future contributions to a Roth IRA. In addition, if you are required to take a required minimum distribution (RMD) in the year you convert, you must do so before converting to a Roth IRA.
LPL Financial and Dixon Financial Group do not offer tax advice or services.