I was recently married and filed a new W4 form (federal US tax withholdings). I checked "Married but Withhold at Single Rate" meaning that my withholdings should be the same as when I was filing as a single person.
The (only) HR/Payroll person at my employer filed this paperwork, but my taxes were withheld at the lower married rate instead of the higher single rate, like I wanted. I've sent two emails asking her to double check this, but she insists that it is not possible for a married person to withhold taxes at a single rate.
I know for a fact that she is wrong, but I've already asked her to double check twice to no avail. She is the only HR/Payroll person in the organization, so there's no one above her with experience in this area for me to appeal to. How can I handle this?