hmosbergea
Level 3

100 % home office used for: landlord business (rentals - Schedule E); Consulting business (Schedule C) and investing (not a business).

Question: Since Home Office not used 100 % for consulting - (60% time for consulting and 40% rentals and investing) is a prorated deduction still allowed for Consulting and zero for the other 2 activities?

0 Cheers
BobKamman
Level 15

Investing is not a business.  Since the office is not used exclusively for business, no deduction is allowed.  

Some taxpayers get away with calling rentals a business, depending on the extent and nature of their activities.  But that doesn't matter, here.

Tell him to stop investing.  He's losing a fortune, anyway.