Respuesta :

Increasing your 401k deduction will increase your gross pay and decrease your federal taxes in the current year.
I believe the answer is: Decrease, Decrease

The allocation  for 401k deduction would be directly cut from your payment as soon as it arrive. So, the amount of payment for your work would be automatically decreased.
But,  the deduction from 401k is not considered as a taxable income, so the payment for your federal tax at the current year would also be decreased.