Great response, and all this highlights the amount of both work and risk involved for a gain of ??? When you do the math you'll see you're greatly increasing your audit risk, the expected value you'd have to pay to go through the audit even if you came back clean, and doing a bunch of work, all for just a few dollars in tax savings. It just isn't worth it, unless you value your time at sub-$5/hour and your peace of mind at nothing.To qualify for a home office, the area in question must be used exclusively as an office. So the answer is potentially yes, if the closet space and the entire bedroom are used only for trading. In the old days when traders and other business people had mountains of paper records, it would have made sense to use the closet as a storage space, e.g., filing cabinets. With everything in digital format, I think it would be harder to justify today, unless you are using the closet as a dedicated secure space for a server or backup computer.
If you get audited on the home office, an IRS agent will actually visit your home, or they will ask for photos. The real point is that if you do this, you better not have a bed or dresser in your home office, and you better have a bed and dresser in a different bedroom.
The bathroom is more subjective. You would have to take the position that you only use that bathroom while you are conducting business in the home office. It would be an easier sell if the home office was for someone like a financial planner, an insurance agent or a psychotherapist who actually meets with clients in the home office, because then you have a dedicated bathroom for the clients, so you can keep them out of your personal living space.
The short answer is no, because the home office deduction for employees was effectively eliminated a couple years ago. Most unreimbursed employee business expenses are no longer deductible, under rules that went into effect at the beginning of 2018.
What might work is to have the S corp rent the space, so it would be deductible as an expense on the corporate tax return.
But that is what is known as a self-rental, when a corporation rents property from one of its shareholders. The rules are complicated, and you have to charge fair market value rent. And the rent becomes taxable to you as rental income on your individual tax return. That might neutralize any real benefit, because the expense on the corporate tax return will not reduce your salary. As a working shareholder, you still have to get reasonable compensation, i.e., a minimum salary that reflects the work you are doing. So the rental expense would only reduce the investment income that flows to you on the Schedule K-1. It could work against you. You could end up paying tax on the rental income, at regular income tax rates, instead of having the income treated as qualifying capital gain on the K-1.
The real solution is probably to have the corporation reimburse you for the cost of your home office. With that approach, it is a deductible expense for the S corp, but it is not income for you. But it has to be an accountable expense reimbursement plan. You have to explore this carefully with an experienced accountant.
https://proconnect.intuit.com/articles/home-office-deductions-expenses/
BMK
Much more productive uses of your time toward minimizing your tax bill:
1. Set up a 401K for yourself
2. Set up a health savings plan for yourself
3. Set up a dependent care FSA if you have any child (or parent) care costs for yourself