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2 401k's and a SEP-IRA
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?