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IRS Tax Center: Starting a BusinessInternal Revenue Service

Small Business and Self-Employed One-Stop Resource
The home page of the IRS small business and self-employed website consolidates timely updates relating to small enterprises. Businesses should occasionally review the new information for changes in tax regulations, new forms and resources and articles regarding topics of particular interest to small businesses.

Checklist for Starting a Business
This checklist provides the basic steps you should follow to start a business in compliance with federal tax and regulatory requirements. Additional federal regulatory information and resources are provided by the US Small Business Administration, US Department of Labor, US Occupational Safety and Health Administration and US Citizenship and Immigration Services.

Business Structures
When beginning a business, you must decide what structure to use. The IRS offers a selection of articles that examine the federal tax consequences of five different types of business entities: sole proprietorships, partnerships, corporations, S corporations and LLCs or LLPs. The section also contains tips regarding tax filing requirements for each entity type.

Employer ID Numbers (EINs)
An Employer Identification Number, also known as a federal tax identification number, is used to identify a business entity. Generally, businesses need an EIN. By answering six questions, a business can determine whether it needs an EIN. Businesses can apply online by completing the IRS Form SS-4, Application for Employer Identification Number.

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