life insurance considered gross wages and then deducted, but need 401K calculated off of the total

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How can I calculate life insurance as taxable wages and part of the total gross wages that the 401K calculates?  This would be the same for the employee match?   For Example an employee makes $500.00 per week.  Life Insurance is $11.31 per week.  I need the 401K to calculate say 5% of 511.31, instead of 500.00.  Total should be 25.56 per week, not 25.00?