All of the 100 e-books discussed are available in EPUB format.
From the Internal Revenue Service:
The Internal Revenue Service today unveiled its 100th eBook — a milestone in IRS efforts to share information to meet the changing needs of taxpayers.
The IRS eBooks effort, which began two years ago, offers an easy way to read and review some of the most commonly used IRS tax products. Through eBooks, taxpayers can view Form1040 instructions, Publication 17 and other frequently used tax publications by using mobile devices such as smart phones, tablets and eReaders.
“This milestone reflects our continuing commitment to share information with taxpayers so they have the information they need in the way they prefer,” said IRS Commissioner John Koskinen. “Our eBook initiative makes it easier for taxpayers to access common publications, even if they’re using a mobile phone or tablet.”
The eBook format makes it much easier to navigate a publication, adjust the print size and add comments or bookmarks on mobile devices. It also provides accessibility for users who are visually impaired.
Direct to Complete List of IRS eBooks