As others noted, you need to form a business entity. Along with that, you'll get a TIN from the Feds. When making your business arrangements with the App Store,

As others noted, you need to form a business entity. Along with that, you'll get a TIN from the Feds. When making your business arrangements with the App Store, you'll use the TIN, rather than your SSN. Thus, all income is credited to the company, rather than you personally. Of course, the company has expenses. Maybe it needs to buy you a new computer? Perhaps a couple iphones for testing. Whatever; the point is, you want to use the company to spend money "pre-tax" so that the net amount left is hat's paid as income. Consult your tax professional on the different ways this income can be paid from the company to you.