However, as I’m nearing the end of my tax prep with turbo tax this morning, the program thinks that I can contribute around $5600 to the solo 401k. I assume turbo tax thinks that I can do both an employee and employer deferral to the solo 401k? I entered my 403b contribution in turbo tax so it should know that I made this employee deferral to the 403b. Did something change with the way 403bs are treated with respect to multiple 401k since this post was written or is this just a bug with turbo tax?
It is really unfortunate, but TurboTax and other tax software do not take a macro view of employee elective contributions across all 401k, 403b, SARSEP and SIMPLE IRA plans. They have all the information necessary reported on your W-2s' Box 12 codes, but they do nothing with it.
While it does not affect you for 2018, you also need to be aware that 403b annual additions (employee + employer contributions) must be aggregated with the annual additions of employer retirement plans (one-participant 401k, etc...) of all businesses your have > 50% ownership.
For 2018 with a 403b $18.5K employee elective contribution and $16K employer contribution. You have no remaining employee elective contribution space and your employer contribution is limited to $55K - $18.5K - $16K = $20,500.
Like I said it does not affect you this year, but if your 1099 revenue grows significantly, one-participant 401k contributions could be limited by 403b annual additions.
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