To add to the response from @AliciaP1, your situation is somewhat unclear given that your spouse does not appear to be a joint owner of the property for the relevant time period. The home office deduction examples provided by the IRS indicate that the person claiming the home office deduction owns the home where their home office is located. Whether you can avoid the lack of ownership issue if the funds used to pay the mortgage, property taxes, utilities, etc. came from a joint bank account with your spouse, is an issue beyond the scope of the advice we can provide. Whether a joint back account will suffice under these circumstances should be discussed with your personal tax advisor or an attorney.
Additionally, you mentioned that your mortgage interest and property taxes are high. Given these facts, keep in mind that you will not be able to claim the home office deduction if such deduction creates a loss.
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