Solo 401k For Part-Time Self-Employment

November 10, 2008 by TFB

In A Non-Deductible IRA Is Worth It For Me, I mentioned I'm going to establish a self-employed 401(k) plan, also known as a solo 401k plan or an individual 401k plan. This is in part for providing a safe haven in 2009 for the pre-tax money in my IRAs, in preparation for converting the remaining after-tax money in my IRAs to Roth in 2010. It will also allow me to shelter a little bit of money from my self-employment income. Every bit helps, you know?

When I tried to figure out how much I can contribute from my self-employment income to the solo 401k, I found that the information on the Internet assumes that the self-employment income is the person's only earned income. For example the calculation worksheets provided by Fidelity, Schwab, and Vanguard all make that assumption. They don't consider the cases like me who work at a day job while earning some self-employment income on the side. Because I participate in the 401k plan at work, the maximum I can contribute to my solo 401k plan changes with what I earn from my day job and what I contribute to the workplace 401k plan. The Social Security tax I pay depends on the sum of my salary as an employee and my self-employment income. The salary deferral contributions I can make from self-employment income also depends on how much I already contribute to my 401k plan at my day job. I would think there are enough consultants, freelancers, moonlighters, and bloggers who are in the same camp as I am, but there is very little resource I could find for people who earn their income from a mix of W-2 salary and self-employment.

You know where this is going to lead to, don't you? I had to create a spreadsheet for myself and I'm sharing it here in case other people like me find it helpful.

Spreadsheet: Solo 401k For Part-Time Self-Employment

This spreadsheet takes into account employment income, contributions to workplace 401k, and self-employment income. It calculates the maximum salary deferral contribution and the maximum profit sharing contribution I can make to my solo 401k plan. If there is no day job, just set the day job related fields to zero and it will work for people who only have self-employment income as well. There are two tabs: one for an unincorporated business (sole proprietorship), the other for an incorporated business. As usual, use this and everything you find on this blog at your own risk, because I'm not a CPA.

I'm going to use Fidelity for my plan because I already have other accounts with them and their plan is free and flexible. Vanguard is going to offer a plan but it looks like they don't allow incoming rollovers and there is no brokerage option.

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Comments

11 Comments on Solo 401k For Part-Time Self-Employment

  1. Matt on November 11, 2008 | permalink
     

    Was wondering why I hadn't seen this issue addressed in any of the personal finance blogs I read. Nice job filling the void! This is very helpful.

    Matt

  2. frugalchick on November 14, 2008 | permalink
     

    Yes, I agree with Matt. Thanks for filling the void. I've been looking for this info for quite a while now with no success. Thanks!

  3. Alex Benke @ MoneyMerc on December 1, 2008 | permalink
     

    Hi TFB, was very excited to see your spreadsheet, I thought I was the only one who created crazy things like this. I created one earlier in the year for a similar purpose (day job + part time job with solo 401k). My goal, however, is to maximize contributions in my solo 401k, since I have full freedom of investment choices there. Granted, it makes a bigger difference once you have more self employment income (I'm contributing 100% this year to my solo 401k, which is almost maxing it out) The OTHER wrinkle, though, is my day-job employer offers a match up to 5% of my contribution. So my goals are to maximize that match first, then the solo-k to the extent of self employment income, and then fill out up to my 15.5k overall limit. Like you, I'm not a CPA – but using your #s your calc's check out with mine ;-)

    http://sheet.zoho.com/public/abenke/2008-retirement-contributions-planning-web

  4. TFB on December 1, 2008 | permalink
     

    Alex – Thank you for cross-checking the calculations. There's a slight difference between your spreadsheet and mine. Using the default numbers, if you make the employee salary deferral $743.48, then the maximum employer profit sharing is only $92.94. You can't make the full 20% profit sharing contribution because it has to be no more than one half of the "Adjusted Net Business Profit after Elective Salary Deferral" (line 6 in Schwab's worksheet). If you want to keep the 20% profit sharing, then the employee salary deferral to solo 401k has to be no more than $557.61.

  5. Bob on December 6, 2008 | permalink
     

    Great work TFB! I have been looking for something like this for a while.

  6. Susan on March 30, 2009 | permalink
     

    Thank you so much. I have been laboring over the Fidelity worksheet but wasn't entirely sure it was correct, since I also fall into the part-time category you outline. Your worksheet is a whole lot easier…and the numbers came out the same — even better! Thanks!

  7. Brad on July 16, 2009 | permalink
     

    Why do a solo 401k, when you could just do a SEP-IRA instead. You can put away even more in a SEP-IRA than a 401k, without all the administration headaches, etc.

    You can put away up about $49,000 (25% of $196,000)… Something like that.

    I suppose if your income is such that you want to put away $16,500 (in 2009) into a 401k, but you make less than 4x or 5x that (25% or 20%), then possibly the headaches of a 401k would be worthwhile.

    I don't think there is any limitation of SEP-IRAs if you are also covered at work (but maybe I'm wrong about that, in which case, you're right–and never mind! ;-)

    Cheers,
    Brad

  8. TFB on July 16, 2009 | permalink
     

    Brad – No you cannot put away even more in a SEP-IRA than a solo 401k. At most you can contribute the *same* amount in a SEP-IRA, but not more.

    The limit on the employer profit sharing side is exactly the same between SEP-IRA and solo 401k. There is no salary deferral in a SEP-IRA, while there is salary deferral on top of employer profit sharing in a solo 401k. That's the difference.

    If you max out 401k at work, SEP-IRA and solo 401k give you the same maximum. If your work 401k isn't that great, you can get the match and do the rest in your own solo 401k. You don't have that option with a SEP-IRA. In addition, you cannot use a SEP-IRA as a safe haven for your other IRA money for the purpose of converting to Roth IRA in 2010 and thereafter.

  9. Brad on July 16, 2009 | permalink
     

    Right you are. I assumed the limit on a solo (individual) 401k was the same $16.5k as for a corporate 401k. But they're different. A "corporate" is really a W-2 401k, then you can also contribute 20% or 25% on top of that. So as you say, a solo or individual 401k allows even higher contributions if you have both a W-2 and a proprietorship/Sched C business (if you want to do the paperwork–though SEP paperwork isn't that simple either, but in both cases a trustee like Schwab or whoever does most of the work for you).

    Thanks for the info!

    Useful link: http://www.sepira.com/sep_ira/sep-or-401k.htm

    I'll spell it out in case your security strips it: sepira.com/sep_ira/sep-or-401k.htm

  10. john czerwonka on January 30, 2010 | permalink
     

    OK. I'm not a techie guy, so I apologize for what might seem like a "dumb" question. I've found the spreadsheet to calculate a solo 401-K contribution and it's very helpful. However, I can't figure out how to save it or print it on my computer. If I use the file save, and try to open it's unreadable. And, if I simply use file/print it only prints half the page. I subscribed to Zoho (whatever that is) hoping it would allow me to save and print the spreadsheet, but I have no idea how to do that. Can any one help?

  11. DAVID NEWMAN on February 1, 2010 | permalink
     

    hI john czerwonka

    I JUST USED MY PRINT OPTION IN MY BROWER

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