>>60576376He'll be fine as long as he documents the business purpose of every allowed deduction and doesn't try to write off any personal use.
e.g. I spend several hours every month calculating how many business miles I put on my personal vehicle and then calculating the business portion of expenses.
home office is similar, you have to calculate square footage used for business and then never use it for personal stuff.
computer or phone, same deal. Have one laptop for business and another for personal and never mix them up. Same with internet. Once connection for me, one for my business. I have one phone for me, several more for business.
that stuff is fine, it just has to actually be business use. You're allowed to write off actual costs of doing business.