I have the same problem. But I rent my house from 01/01/20. My home office started on 08/01/20, however the turbotax step-by-step guide is asking me for the whole home expenses (rent, insurance, etc.) and I am worried if I just have to enter the whole home expenses amounts from 08/01/20 to 12/31/20 or all the 12 months and let the turbotax do the math.
