- IRS - Internal Revenue Service: The official site of the Internal Revenue Service.
- IRS Forms and Publications: Any and every tax form you will ever need, right here.
- FedWorld: Archived IRS forms; goes back to 1992.
- Yahoo Tax Center: Find forms for both federal and state taxes here, tax calculators, and a lot more.
- IRS Free File: a list of Free File services and sites.

