Form 1120-S is an IRS tax return document used by S corporations (S corps) to report profits, losses, and deductions for the fiscal year. As pass-through tax entities, S corps do not pay corporate taxes; instead, income is passed through to shareholders and taxed at their personal income tax rate. Alongside other IRS forms, Form 1120-S is typically accompanied by Schedule K-1 Form 1120-S to detail each shareholder's income, deductions, credits, and ownership. The submission deadline for Form 1120-S is the 15th day of the third month after the fiscal year ends, ensuring compliance with tax regulations.
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