You could. But you’d want a good reason to. For example, if you live there and are planning on running your business from there, makes sense. If you’re running your business in California, then incorporating in Nevada may be due to more nefarious reasons. Some attorneys like to organize their clients in Nevada because reaching an LLC’s assets through its members in Nevada is not permitted. Still, if your business is based in California, you’ll still need to register the corporation or LLC in California (too) and pay taxes in California.