The following are links to the most common tax forms needed to prepare your client’s income tax returns. You can also access and search for these forms directly at www.irs.gov. All tax forms are in the portable document format (PDF) and Adobe Acrobat Reader. You can use Acrobat Reader to view the documents and print documents. Most of the IRS forms also allow you to type in your information and save a copy with your data to your computer.