Question: how do i find out how much i owe in back federal taxes?
Answer: Calling the IRS to Find Out How Much You Owe If you don't have a cell phone, a loan, or any the other information required for the online service, you may find out your balance by calling the IRS directly. Individual taxpayers may call 1-800-829-1040, Monday through Friday, 7 a.m. to 7 p.m. local time.