I think the formula in Quickbooks has not been adjusted to account for the new form calculation, they aren't understanding it, I am putting in the number not the amount, when I put the amount in in resulted in zero tax being withheld. Then worse that could happen is the employee will get a refund at the end of the year, not so bad, I just check with the employees and make sure they are aware of the situation and if they need to they can always have additional amount withheld too