Contribute to both a SEP IRA and solo Roth 401(k)?
In addition to the normal limits, A Solo 401(k) allows you to contribute up to 20% of net profits (sole proprietor) or 50% of salary (if a corporation), up to $49,000. Note that the fees for 401(k) accounts are higher than with the IRA. See 401(k)s for small business.
If you were looking to maximize your ability to save in a qualified plan, why not setup a 401K plan in Company A and keep the SEP in B? Setup the 401K in A such that any employee can contribute 100% of their salary.  Then take a salary for around 19K/year (assuming under age 50), so you can contribute and have enough to cover SS taxes.   Then continue to move dividends to Company A, and continue the SEP in B.  This way if you are below age 50, you can contribute 54K (SEP limit) + 18K (IRA limit) + 5500 (ROTH income dependent) to a qualified plan. Does the 457(b) plan allow for the rollover of other retirement funds into it? And do you have very specific reasons for wanting to roll over your SEP-IRA into the 457(b) plan instead of into some other IRA plan with a different custodian? For example, if you already have a Traditional IRA, is there any reason why your SEP-IRA should not be rolled over into the Traditional IRA? With regard to the question about separate accounts, once upon a time, rolling over money from an employment retirement plan (e.g. 401k) into a Traditional IRA required establishing a separate account called a Rollover Traditional IRA so that the rolled-over money (and the earnings thereon) were not commingled with standard traditional IRA money resulting from personal contributions). This was so that the account owner had the option of rolling over the separately kept money into a new employer's retirement plan (if such a rollover was permitted by the new 401k plan). If one did not want to ever roll over money into a new employer plan, one had to write a letter to the custodian telling them that commingling was OK; you never wanted to put that money into another 401k plan. The law changed some time later and the concept of Rollover IRAs holding non-commingled funds has disappeared.  With that as prologue, my answer to your question is that perhaps the law did not change with respect to 457(b) plans, and so the money that you want to rollover into the 457(b) plan needs to be kept separate and not commingled with your contributions via payroll deduction to the 457(b) plan (in case you want to ever roll over the SEP-IRA money into another SEP-IRA). Hence, separate accounts are needed: one to hold your SEP-IRA money and one to hold your contributions via payroll deductions. Please note that if you are self employed, then the profit sharing limit for both the SEP and Solo 401(k) is 20% of compensation, not 25%. There is no need for a SEP-IRA in this case.  In addition to the 401(k) at work, you have a solo-401(k) for your consulting business.  You can contribute $18,000 on the employee side across the two 401(k) plans however you wish.  You can also contribute profit sharing up to 20% of compensation in your solo 401(k) plan.  However, the profit sharing limit aggregates across all plans for your consulting business.  If you max that out in your solo 401(k), then you cannot contribute to the SEP IRA. In other words, the solo 401(k) dominates the SEP IRA in terms of contributions and shares a limit on the profit-sharing contribution.  If you have a solo 401(k), there is never a reason to have a SEP for the same company. Example reference: Can I Contribute to a solo 401(k) and SEP for the same company? Short answer is fund a Roth.   If you are under 50 then you can put in $5500 or $6500 if you are older. Great to have money in two buckets one pre tax and one post tax.  Plus you can be aggressive putting money in it because you can always take money you put in the Roth out of the Roth with no tax or penalty.   Taxes are historically low so it makes a lot of sense to diversify your retirement. From Schwab -  What are the eligibility requirements for a business to establish a SEP-IRA? Almost any type of business is eligible to establish a SEP-IRA, from self-employed individuals to multi-person corporations (including sole proprietors, partnerships, S and C corporations, and limited liability companies [LLCs]), tax-exempt organizations, and government agencies. What are the contribution limits? You may contribute up to 25% of compensation (20% if you’re self-employed3) or $49,000 for 2011 and $50,000 for 2012, whichever is less. If we set the PC aside, you and the son have an LLC renting office space, this addresses the ability of the LLC to offer the retirement account. You setup a self-directed solo 401k by paying a one time fee for a company to setup a trust, name you the sole trustee, and file it with the IRS. None of these companies offer TPA because it opens them up to profit leaching liability. After you have your trust setup, you can open a brokerage account or several with any of the big names you want (Vanguard, Fidelity, Ameritrade, etc), or just use the money to flip houses, do P2P lending, whatever, the world is your investment oyster. If the company has recurring fees you need to ask what is going on because if they aren't offering TPA services, then what the heck could they be charging you for? I did see one company, I think it was IRA Financial Group, that had the option of having a CPA do TPA for you for a recurring fee, but I would pass on that. The IRS administration requirements are typically just the 5500-EZ that you have to file as a hard copy by July 31 if your investments are worth more than $250k, on December 31. Yes, you have to get the actual form from the IRS, write on it with a pen and mail it to them every year, barbaric. You can either have your accountant do it or do it yourself. If you're below $250k just google solo 401k rule change two or three times a year and don't try to launder money. If anything, the rules will loosen with time, I don't imagine the Republican Congress cracking down on small business owners any time soon. You're correct about the 401(k). Your employer's contributions don't count toward the $18k limit. You're incorrect about the IRAs though. You can contribute a maximum of $5500 total across IRA and Roth IRA, not $5500 to each. There are also limits once you reach higher levels of income. from IRS.gov: Retirement Topics - IRA Contribution Limits: For 2015, 2016, and 2017, your total contributions to all of your traditional and Roth IRAs cannot be more than: "I humbly disagree with #2. the use of Roth or pre-tax IRA depends on your circumstance. With no match in the 401(k), I'd start with an IRA. If you have more than $5k to put in, then some 401(k) would be needed.  Edit - to add detail on Roth decision. I was invited to write a guest article ""Roth IRAs and your retirement income"" some time ago. In it, I discuss the large amount of pretax savings it takes to generate the income to put you in a high bracket in retirement. This analysis leads me to believe the risk of paying tax now only to find tHat you are in a lower bracket upon retiring is far greater than the opposite. I think if there were any generalization (I hate rules of thumb, they are utterly pick-apartable) to be made, it's that if you are in the 15% bracket or lower, go Roth. As your income puts you into 25%, go pretax. I believe this would apply to the bulk of investors, 80%+." You're right, of course - But that's not something you would ever want to do *accidentally*.   Five years from now, the OP may well decide to convert some of his traditional funds to Roth; for now, even though Roth was his original intent, that would mean a tax bloodbath come next April.   As an aside, the biggest reason (for most people) to have Roth funds **isn't** because you expect to make more (inflation - or more importantly, tax-code - adjusted) in retirement than now.  If that were the case, the entire concept would be almost worthless - Who the heck makes more *after* retiring than *before*?  The best reason to have substantial Roth funds in your retirement portfolio is the way that Social Security is taxed.  If you can keep your AGI under $25k (note that includes half of your SS benefits, but since the standard deduction is roughly $10k, those more-or-less cancel each other out), you don't pay a dime in taxes on your SSI.  So, if you have a solid budget, take your yearly expenses, subtract out $25k, and that's what you should (sustainably) have in Roth funds.  The remaining $25k is what you should have in traditional funds. "You seem to be treating your Roth IRA as a sort of savings account for use in emergency situations.  I would use a savings account for savings as withdrawing money from an IRA will have penalties under various circumstances (more than contributions, Roth IRA less than 5 years old, more than $10k for a down payment). Also, you mention folding your IRA into your 401k so that it will ""grow faster"".  However, this will not have that effect.  Imagine you have $30k in an IRA and $100k in a 401k and you are averaging a return of 8% / year on each.  This will be identical to having a single 401k with $130k and an 8% / year return. This is not one of your questions, but employer matches are not counted in the 401k contribution limit.  If your 22% calculation of your salary includes the match to reach the max contribution, you can still contribute more." They are mutually exclusive.  Provided you meet the income limits you can contribute to both.  Employer match do not count toward the 18K.   On the other hand traditional IRA and Roth IRA are inclusive.  So if single and making having a MAGI under 118K, you could do the 18K of your own money into a 401(k), and $5,500 into a Roth. You can put in $23,500 of your own money with the employer match on top of that. "It seems I can make contributions as employee-elective, employer   match, or profit sharing; yet they all end up in the same 401k from my   money since I'm both the employer and employee in this situation. Correct. What does this mean for my allowed limits for each of the 3 types of   contributions? Are all 3 types deductible? ""Deductible""? Nothing is deductible. First you need to calculate your ""compensation"". According to the IRS, it is this: compensation is your “earned income,” which is defined as net earnings   from self-employment after deducting both: So assuming (numbers for example, not real numbers) your business netted $30, and $500 is the SE tax (half). You contributed $17.5 (max) for yourself. Your compensation is thus 30-17.5-0.5=12. Your business can contribute up to 25% of that on your behalf, i.e.: $4K. Total that you can contribute in such a scenario is $21.5K. Whatever is contributed to a regular 401k is deferred, i.e.: excluded from income for the current year and taxed when you withdraw it from 401k (not ""deducted"" - deferred)." The original contribution of X to Roth IRA in your reasoning is a red herring. It doesn't exist, never happened. You recharacterized it, so what you did in reality is contribute X to Traditional IRA. "Close... Warning, I may be off a bit here; I'm sure someone will correct me if so. Traditional 401k or IRA: money goes in pre-tax (so, yes, you avoid paying tax on it now), grows untaxed, taxes are due when you retire and start taking money back out of the account -- but your income, including these withdrawals, is likely to be lower than your peak earning years so your tax rate will be lower. You don't avoid all the tax, but you delay it and hopefully reduce it, and by doing so there's more money in your account earning returns. Roth 401k or IRA: money goes in after taxes (you do pay income tax now). However, all returns on the money are untaxed (I believe), and you pay no tax when you're eligible to withdraw the funds.  Either or both kinds of 401k may be eligible for some percentage of matching funds from your employer (there are some incentives for them to offer this benefit). I believe that even if you're doing a Roth 401k, the matching funds legally have to go in as traditional plan. And yes, as that implies, it is possible to split your contribution between the two styles. Note: the matching funds are ""free money."" If your plan offers a match, it is highly recommended that you contribute enough to your 401k to capture the maximum match." My understanding is that to make the $18,000 elective deferral in this case, you need to pay yourself at least $18,000.  There will be some tax on that for social security and Medicare, so you'll actually need to pay yourself a bit more to cover that too. The employer contribution is limited to 25% of your total compensation.  The $18,000 above counts, but if you want to max out on the employer side, you'll need to pay yourself $140,000 salary since 25% of $140,000 is the $35,000 that you want to put into the 401k from the employer side. There are some examples from the IRS here that may help: https://www.irs.gov/retirement-plans/one-participant-401-k-plans I know that you're not a one-participant plan, but some of the examples may help anyway since they are not all specific to one-participant plans.