Old IRS forms can be found on the Prior Year Products Page. Most people are looking for “Form 1040” for a personal tax return, so just type “1040” in the search box and you will see all the older years popup. If it is a different form, just use the form number to find it.
Video on getting old IRS forms:
Old FTB forms can be found on their 2010 and Prior Year Tax Forms Page for items older than 2010. Franchise Tax Board is the state income tax entity for California. The standard income tax form for California is “Form 540.” 2011, 2012, 2013, 2014 and 2015 forms can be found on the regular FTB Forms and Publications Page.
Video on getting old FTB forms:
This list will be updated with other old tax forms from time to time.