Helpful IRS links for freelancers.
The website is http://www.irs.gov. Here are useful pages on it for freelancers.
Starting, Operating or Closing a Business Whether you are a budding entrepreneur, or an established business owner, you will find everything you need to start and manage your business venture.
Business Taxes The form of business you operate determines what taxes you must pay and how you pay them.
Checklist for Starting a Business This checklist provides the basic steps you should follow to start a business.
Business Structure When beginning a business, you must decide what structure to use. Legal and tax considerations enter into this decision.
Employer ID Number An Employer Identification Number (EIN) is also known as a federal tax identification number, and is used to identify a business entity. Generally, businesses need an EIN.
Online Application for EIN – Form SS-4 Apply online for the Employer Identification Number (EIN), also known as a Federal Tax Identification Number.
IRS Forms and Publications
Forms and Publications Need an IRS form or publication?
Also, see my list of useful financial and tax websites.