Helpful IRS links for freelancers.
The website is http://www.irs.gov. Here are useful pages on it for freelancers.
Overview
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.
https://www.irs.gov/businesses/small-businesses-self-employed/starting-a-business
Business Taxes The form of business you operate determines what taxes you must pay and how you pay them.
https://www.irs.gov/businesses/small-businesses-self-employed/business-structures
Gig Economy If you use one of the many online platforms available to rent a spare bedroom, provide car rides, or to connect and provide a number of other goods or services, you’re involved in what is sometimes called the gig economy.
https://www.irs.gov/businesses/gig-economy-tax-center
Getting Started
Tax Information for Businesses If you run a small business or are self-employed, the IRS web site offers a wide variety of information to help you.
https://www.irs.gov/businesses
Checklist for Starting a Business This checklist provides the basic steps you should follow to start a business.
https://www.irs.gov/businesses/small-businesses-self-employed/checklist-for-starting-a-business
Business Structure When beginning a business, you must decide what structure to use. Legal and tax considerations enter into this decision.
https://www.irs.gov/businesses/small-businesses-self-employed/business-structures
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.
http://www.irs.gov/Businesses/Small-Businesses-&-Self-Employed/Apply-for-an-Employer-Identification-Number-(EIN)-Online
Online Application for EIN – Form SS-4 Apply online for the Employer Identification Number (EIN), also known as a Federal Tax Identification Number.
https://sa.www4.irs.gov/modiein/individual/index.jsp
IRS Forms and Publications
Forms and Publications Need an IRS form or publication?
http://www.irs.gov/formspubs/index.html