The Internal revenue service (IRS) provides several services to help taxpayers with their federal taxes. These services are known as tax resolution services, and they can provide valuable assistance to individuals and businesses alike. Here are some of the most common tax resolution services California: IRS Audit Representation, Non-Filed Tax Returns, Back Taxes Owed, Payroll Tax Problems, and IRS Liens. At G&S Accountancy Inc., they specialize in providing internal revenue service San Bernardino in the area.