Download the IRS form for an irrevocable trust from the official website for the Internal Revenue Service, according to the IRS's official website. The form, which is Form 706-GS(T), is available in both HTML and PDF formats. PDF forms are printable only if Adobe Acrobat Reader is installed on the computer of the person downloading the form.
To find the form, navigate to the IRS's website and click on "Forms & Pubs" from the tabs across the top of the home page. From the "Forms & Pubs" tab, click on the blue "Find All Current Forms & Pubs" radio button. Enter the form number in the "Find" box, click "Find" and then click on the form to pull it up, states the IRS's website.