If your spouse has self-employment income, her business expenses go on Schedule C. That is different from the Schedule A where you enter "itemized" deductions such as mortgage interest, medical expenses etc. You can use standard deduction and have Schedule C on the same joint tax return.
If you have self-employment income for which you will pay self-employment tax for Social Security and Medicare, you will need to use online Premium software or any version of the desktop software download so that you can prepare a Schedule C for your business expenses.
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