You could elect to be treated as a Qualified Joint venture and both you and your spouse could claim the home office deduction on each separate Schedule C. This means you would have to share a portion of the income and expenses and you will be filing two Schedule C's on your joint tax return.
How to Make the Election to be Treated as a Qualified Joint Venture: Spouses can make the election on a jointly filed Form 1040 or 1040-SR by dividing all items of income, gain, loss, deduction, and credit between them in accordance with each spouse’s respective interest in the joint venture, and each spouse filing with the Form 1040 or 1040-SR a separate Schedule C (Form 1040 or 1040-SR), Profit or Loss From Business (Sole Proprietorship)
Spouses electing qualified joint venture status are treated as sole proprietors for Federal tax purposes. The spouses must share the businesses’ items of income, gain, loss, deduction, and credit. Therefore, the spouses must take into account the items in accordance with each spouse's interest in the business. The same allocation will apply for calculating self-employment tax if applicable, and may affect each spouse’s social security benefits. Each spouse must file a separate Schedule C (or Schedule F) to report profits and losses and, if otherwise required, a separate Schedule SE to report self-employment tax for each spouse.
