You can just use the one that IRS has. Do you know the figure in the IRS database? Did you call them? You can call Turbotax at 800-446-8848. Call early or there is a long wait time. It's best to go through Help in the program. If you choose that none of the topics is relevant, they will give you case # . Then when you call it will recognise that number from your phone # and the wait will be shorter. But still call early.
