I know the IRS regs say that the home office simplified method can only be used for one home. However, if a TP has been using the simplified method for their old house and then moved during 2020, does this mean they have to select the actual method for their new house? This doesn't seem to be correct.

However, PS errors indicate that I can't split the usage between their old house and new house.

The TPs didn't, and probably can't, provide the actual expenses for the new house. So I wouldn't be able to report the actual method anyway. Plus, they wouldn't want to report depreciation for the home office.

How can the simplified method be reported for this TP?

Thanks.