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What threshold to move from SEP to Solo401k?
I think this article explains it pretty well: Contributions to a SEP are limited to   20% of your business  income (which is   business income minus half of your   self-employment tax), up to a maximum   of $45,000. With a solo 401(k), on the   other hand, you can contribute up to   $15,500 plus 20% of your business   income (defined the same way as   above), with a maximum contribution of   $45,000 in 2007. You can make an extra   $5,000 catch-up contribution if you're   50 or older