Business must report income, expenses, deductions, and payroll taxes to calculate tax liability. The type of business tax return you are required to file is dependent on your business entity: Sole Proprietorship, Partnership, S Corporation, C corporation, LLC – Single member, LLC – Multi Member. We specialize in the preparation of the following business tax returns: 1040 Schedule C, Form 1065, Form 1120-S, and Form 1120.