Inherited IRA from parent. Know how to calculate from bases of estate. I need to know how to enter into TT. There is a tax benefit I can claim. Hope this made sense.

Father in law died in 2001. Left an IRA for the family. Each year since, we have to calculate our distributions and a multiplier by the "bases of estate" and we get a number. This number we put into the tax form to claim as a tax break. I just can not remember where it goes or what special calculations TT needs to do to accommodate it. Yes, now it all seems clear as mud. LOL.