Alternative approach
1) do not change your allowances
2) take the amount you will owe on April 15 and sivide by 52 (I’d you are paid weekly) or 26 (if you are paid evey other week), etc
3) full out the w-4 again and add the amount from item 2 as the additional amount you want to be taken out on each paycheck .... that I’m will get you much closer to zero / getting a small refund
