There is no shortage of resources for folks looking to take a do-it-yourself approach to filing federal income tax. For individuals with a relatively simple tax profile, this may not be such a problem, but for those who have a more complex situation, who have significant wealth, and for businesses, it is important to not be guessing when filing returns.
One thing that needs to be kept in mind about do-it-yourself tax filing, though, is that taxpayers are ultimately responsible for mistakes they make in their filing, whether or not they relied on published information about filing taxes. This is true even information provided by the IRS! So taxpayers cannot rely on the accuracy of the information they gather in doing their own taxes. Ultimately, they are responsible for any mistakes they make.