If you sell the taxable account for $9,325 after tax, and then invest in a pre-tax 403(b), you will have $12,433, not $9,325, to invest in the 403(b), because you get a $3,108 tax deduction on the $12,433 contribution. Thus you will have $50,611 after tax. (And in a Roth 403(b), you will have $9,32...