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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
Closing a business - Internal Revenue Service
File an amended return - Internal Revenue Service
Failure to File Penalty - Internal Revenue Service
Get a business tax transcript | Internal Revenue Service
Publication 3402 (03/2020), Taxation of Limited Liability Companies
Filing past due tax returns | Internal Revenue Service
Filing and paying your business taxes | Internal Revenue Service