Deductions & credits

You will enter them as they were used without concern for the other.

So if you had 2 businesses that you had a home office in both your old home and your new home, you would enter the home office the same way for each business.  You will enter that you used XYZ address for business A home office for the first X months of the year, then when askes if you lived in the same home all 12 months say no and a drop down will appear and allow you to enter the second home. Then  enter the address of the new home and the number of months you used it for the rest of the year.  

You will then repeat for the second business.  

You will allocate the expenses to each business based on usage.  Meaning, if you use the office 20% for business A and 805 for business b, business A will get 20% of the expenses and business B will get 80%.  Both offices will be reported on the corresponding Schedule C. 

Can I claim the home office deduction for two or more businesses?