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Limited liability company (LLC) | Internal Revenue Service
LLC filing as a corporation or partnership - Internal Revenue Service
Single member limited liability companies - Internal Revenue Service
Publication 3402 (03/2020), Taxation of Limited Liability Companies
Publication 334 (2024), Tax Guide for Small Business
Filing and paying your business taxes | Internal Revenue Service
About Form 1120, U.S. Corporation Income Tax Return
Employer identification number | Internal Revenue Service