To start, surely we can agree that it is generally best for an individual to use all tax advantaged options available when investing for retirement? E.g., it generally wouldn't make sense to invest in a taxable brokerage account if you aren't maxing your 401k, HSA (if applicable) and IRA. Yes?
OK, assuming we are on the same page so far...
Say an individual has access to a qualified retirement account at work (for example, a 401k) and they max it out by making $20,500 in contributions per year. They also max out their HSA by contributing $3,600 per year. This hypothetical individual would like to invest more money above and beyond their 401k and HSA.
Ok, so how can they continue to invest in a tax advantaged way? They make
more than $144k MAGI, so they cannot contribute to a Roth IRA. They also get no tax deduction towards contributing to a traditional IRA, because they
have a qualified retirement plan at work and they make more than $78k MAGI.
If this person would like to continue investing in a tax advantaged account, the only options available to them are to make mega-backdoor Roth contributions through their 401k (only certain 401ks and payroll systems allow this) and/or they can make backdoor Roth contributions.
This hypothetical individual either already maxes out mega backdoor Roth or they don't have access to a mega backdoor Roth because their employer plan doesn't allow it.
So, a
Backdoor Roth it is!
Cool, this individual is going to go through the process of making a nondeductible (i.e. taxed and not deducted) contribution to a traditional IRA, then converting the traditional IRA to a Roth IRA.
But wait, this individual already has money in a traditional IRA either from contributing to the IRA when they made less money in the past or from rolling over an old 401k into an IRA. If they were to try to convert from a traditional IRA to a Roth IRA, they'd run afoul of the pro rata rule.
Quoting directly from the Bogleheads wiki that I linked to above-
"If you have any other traditional IRAs, the taxable portion of any conversion you make is prorated over all your traditional IRAs; you cannot convert just the nondeductible amount.[3] There are three options for how to deal with an existing traditional IRA getting in the way of a backdoor Roth IRA:
-Convert the entire traditional IRA to Roth, and pay tax on the pre-tax amount of the conversion. For a small traditional IRA this may be the easiest and best option, but if the traditional IRA is large, this will result in a large tax bill. If you are making backdoor Roth IRA contributions, you are in a middle or high tax bracket, so this might be undesirable.
-Roll the pre-tax portion of the traditional IRA into your 401(k) or 403(b) or 457(b) at work, assuming it accepts rollovers. If the employer plan has poor investment options and/or high fees, this may be undesirable. However, if the employer plan is large and well-managed, it may have access to institutional share classes with even lower expenses than are available in the IRA.
-Start a business, open an Individual 401(k) that accepts rollovers, and roll over the traditional IRA into the Individual 401(k). The amount of the rollover is not limited by the amount earned by the business. For example, a $10M traditional IRA can be rolled into an Individual 401(k) opened on $10 of legitimately-earned self employment income.
In any case, you have until December 31st of the tax year in which you make the backdoor Roth IRA conversion to dispose of the traditional IRA. If you still have a traditional IRA balance on December 31st, then the pro-rata rule will apply to the conversion. For example, if you attempt to make a backdoor Roth IRA contribution of $6,000 while having a traditional IRA with a pre-tax balance of $50,000, then only 10.7% ($6,000 / ($50,000 + $6,000)) of the conversion step will apply to the non-deductible amount, and the remainder will be converted from the pre-tax amount. This will result in $5,357 ($6,000 * (1 - 10.7%)) of taxable income."
For our hypothetical individual, creating a self directed 401k and rolling the existing traditional IRA into it may be their best course of action so that they have access to a backdoor Roth IRA without creating taxable income for themself.
That's it, that's the entire point of the discussion around solo/ self directed 401Ks in this thread.
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