i know if u have kids, thats 1 tax deduction. what else?

only tax income. not business owners.

It’s common for business owners to deduct certain expenses such as car mileage etc. Can the business owner still claim the deduction if some of the mileage was driven on his or her spouse’s car (for instance because the main "business car" was stuck in the shop waiting for a part for a few weeks, the business had to be run on the family car for a while). Thanks
Assume there is full documentation for everything. I’m just trying to determine whether the technicality of whose name is on the car title (business-owner or spouse) matters at all.