OK, I am Galting but I think that I am getting somewhere. Reading section 415 I read it as the need to only aggregate contributions made by one employer. Just like 402g aggregates all your employee contributions. But it looks like there is yet another rule in section 415 which provides that the 403(b) participant's employer includes any business of which you have more than 50% control. That provision seems to require the SEP-IRA 415 maximum be combined with the 403(b) because both plans are deemed maintained by the same employer.
So, back to my summary, this is now where I am coming down:
1. You have a job. You do not own any interest in the employer. The employer has a 401k. You max out your contribution at 16,500. The employer maxes out the match and profit sharing so the total contributions for the year are $49,000.
2. You have a side business as a solo proprietor. Your profits are $400,000. You max out a SEP and contribute $49,000. Now you have a total for the year contributed to retirement plans of $98,000.
3. You take another job that has a 403b. No contributions can be made because you maxed out the SEP.
Please people, don't take any of this as legal advice.
One last Galt and a narcissistic self-quote.
Fairmark Forum :: Retirement Savings and Benefits :: Sep Ira contribution and active participant
Fairmark Forum :: Retirement Savings and Benefits :: Max retirement contribution/two jobs
These Fairmark threads are consistent with my analysis. I should have gone there first!