<p>Basically, your assumptions are correct, but because you allowed for such a high amount (50%) in calculating how much it would increase your EFC, it doesn't truly demonstrate the advantage of the tax deferred money. </p>
<p>If you put $10,000 into a 401k your EFC will be increased by a percentage of the full $10,000. </p>
<p>If you do not put the money in a 401K, the taxes reduce the income for calculation purposes, so your EFC will increase based ona percentage of the $7000. </p>
<p>Using your hypothetical 50%, your calculations show an increase in EFC with the 401K of 6500 and without 3500, but you fail to add back the $3000 you saved, basically appearing as a wash(6500 in each scenario) but unless full need is being met you are still better off knowing you'll get that $3000 in returned taxes. Plus if your assets are close to the asset protection allowance, you are now increasing assets $7000 (10,000-3000 in returned taxes). This would add another 12% of the 7000 equaling an additional 840 to your available income. and a percentage of that 840 would increase your EFC further. </p>
<p>However, try recalculating with more realistic percentages and the numbers definately fall in favor of the 401K. I'm not exactly sure percentage of available income is used, but it's somewhere between 25-30. I'll go with the higher amount. </p>
<p>You put $10,000 into a 401K, your EFC increases by $3000, but you've also saved 3000 in taxes. Basically a wash take the 3000 and put it towards college expenses. </p>
<p>You don't put $10,000 into 401K, you pay 3000 in taxes, and your EFC increases by 30% of the 7000, another 2100. So now you are out 5100. Plus, that 7000 you decide to put in the bank will further increase your EFC by 30% of the 840 (12% of unprotected assets), amounting to another $252 for every year that extra 7,000 is in your bank account.</p>
<p>So, while your assumptions were correct, the use of 50% for simplicity purposes did not give a true picture.</p>