<prompt> Human: I get paid monthly at the end of each month, and my pay stub is posted online in advance. When I checked it today, I was surprised to see that despite increasing my 401k contribution from 5 to 7, my net pay was 150 dollars higher than my checks last year, and the reason being my federal withholding decreased from 1935 to 1610. My w4 and salary has not changed from last year.Does anyone have any potential explanation for this? Thanks.  <response>: Uh, the new tax bill that was signed in December? 