the below link is a comprehensive list of Federal Government Programs under the primary Agencies. Creating the filing forms is going to be the most expensive and difficult part of the web design. We are starting to believe, according to Topic No. 253 Substitute Tax Forms, https://www.irs.gov/taxtopics/tc253, that we should make the 1040 and other filing forms, so that after filling them out, they can be printing and mailed in, circumventing the need of having to directly link with the IRS online filing system.
It notes: “If you want to produce your own version of a tax form, you should first obtain a copy of Publication 1167, General Rules and Specifications for Substitute Forms and Schedules“. They have made it hard on us, it is time we pay them back. Make then do all the analysis by hand rather than by online automated analysis.
List of Federal Agencies – Wikipedia