The deductibility of home office expenses would depend on whether you are considered an employee or self-employed. And that is a legal question, rather than a tax question. Do you have a contract with this California start-up and does the contract indicate that you are an employee or independent contractor? Here are three articles that may help in this determination:
If you are an independent contractor then you can probably deduct home office expenses. This space must be your principal place of business and you must use it exclusively and regularly for business. The Home Office Deduction explains these requirements in more detail. And Setting Up a Home Office walks you through how to calculate the deduction and what expenses to include.
The market value of the stock at the time you receive would be considered your income. This is known as Equity Based Compensation. If you're considered an employee the information you need to complete your return will be included on Form W-2. If you're considered an independent contractor than you should receive Form 1099-NEC.
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