One of the most common topics readers ask about is what my wife and I do with our own portfolio. Admittedly, I derive some amusement from that fact, given that our own portfolio is as unexciting as a portfolio can be. As we’ve discussed here on a few occasions, we use a grand total of one mutual fund for the entirety of our retirement savings.
Our retirement account decisions aren’t especially exciting either: We max out our Roth IRAs every year, then we contribute as much as we can afford to contribute to a solo 401(k) with Vanguard.
Still, a handful of readers have asked about the decision process for why we use a solo 401(k) and why we went with Vanguard, so here goes.
Why Solo 401(k)?
We chose to use a solo 401(k) — alternatively referred to as an “individual 401(k)” or “self-employed 401(k)” — rather than a SEP IRA or SIMPLE IRA because a solo 401(k):
- Allows for larger contributions each year, and
- Can accept Roth contributions. (Of note: It is only the employee contributions to a solo 401(k) that can be designated as Roth contributions. The employer contributions must be tax-deferred.)
It is slightly more work to open a solo 401(k) — rather than opening the account online in just a few minutes, you actually have to fill out some on-paper forms and mail them in to Vanguard. But it’s not especially difficult.
Why Vanguard?
We opted to use Vanguard for two reasons:
- As mentioned above, we like their all-in-one funds, and
- We already had our other accounts with them, so it’s simpler to keep everything in one place.
That said, Vanguard’s solo 401(k) isn’t going to be a good fit for every self-employed person. For example, Vanguard’s plan does not allow for incoming rollovers. For us, this is a nonissue, but for other people it could be an important point. (Rolling money from a traditional IRA to a 401(k) can sometimes be helpful as a part of a backdoor Roth IRA strategy.)
Fortunately, there are several firms that offer no-fee solo 401(k) plans that do allow for incoming rollovers. For example, as of this writing:
- Fidelity’s solo 401(k) and Schwab’s solo 401(k) both allow for incoming rollovers, but, unfortunately, they do not allow for Roth 401(k) contributions.
- E*Trade’s solo 401(k) plan allows for incoming rollovers and Roth contributions. And if you have an incoming rollover of $25,000 or more, you may qualify for a new account bonus. On the other hand, you would probably end up spending some money each year on trade commissions (e.g., to buy low-cost ETFs from Vanguard or another fund family).
- TD Ameritrade’s solo 401(k) plan allows for Roth contributions and incoming rollovers, and you can buy many ETFs (including many popular ones from Vanguard) without paying commissions.


Hi. I'm Mike Piper, the author of this blog. I'm 



