Financial Glossary
Form 1120-S (S Corporation Tax Return)
Form 1120-S is the U.S. income tax return that an S corporation files annually to report its income, deductions, gains, and losses. Because an S corporation is a pass-through entity, it generally does not pay corporate income tax itself; instead, results flow to shareholders through Schedule K-1, which reports each shareholder's share of items to include on their personal returns. The form ties the corporation's books to what each owner reports individually.
Problem & Application
Owner-operators who elect S corporation status must file Form 1120-S accurately and issue a correct Schedule K-1 to each shareholder, since errors flow straight onto personal returns. Reasonable-compensation rules, distributions, and basis tracking all interact with this return, making clean books essential before filing. Because deadlines and requirements can shift, owners should confirm current IRS guidance and file on time to avoid penalties.
In Short
Form 1120-S is the central filing for S corporations, and getting it and its K-1s right keeps both the entity and its owners compliant.