I paid off my mortgage, how much additional should i contribute to 401k or deferred compensation program to offset loss of mortgage deduction?

[Opus 17]

Unless your income is really high and you are subject to some of the weird adjustments on schedule A itemized deductions, one deduction has much the same value as another.  If you are going to miss a $6000 interest deduction, you would need to put away $6000 to save the same amount of tax that the interest would have saved.