Walter Updegrave, a financial columnist, for CNN writes about the Solo 401(k) for self-employed individuals. Combined with a profit sharing component, this type of defined contribution plan can produce the largest contribution compared to other defined contribution plans. Mr. Updegrave makes this point by comparing the Solo 401(k) to a SEP using the example of a self-employed individual, age 50, who has $50,000 in earned income.

A $20,000 difference as shown below:

Maximum Profit Sharing $10,000
Maximum 401(k) $15,000
Maximum 401(k) Catch Up $  5,000
Maximum Solo(k) $30,000
Maximum SEP $10,000

Here  is the link to Mr. Updegrave’s article.