So I have done a quite a few tax returns and now completed my son's tax return. He says "Mom why do I owe? you told me to claim Single/zero on my W-4". So I looked into this further. I did the ADP calculator and then I compared it to the IRS tax chart. It seems the ADP calculator is at a lower tax then what is reflected on the IRS tax table. Has anyone else seen this as well?
