If you live in California there's an annual minimum franchise tax of $800, plus whatever annual fees are charged by the state you incorporate your LLC in.
If you're someone with lots of ideas and lots of peaks of excitement, it actually might better to postpone incorporation until you can't responsibly continue without some sort of limited liability.
Generally, incorporation as an LLC is preferable for entities making more than $100,000 in revenue, while an S Corp is preferable for lower revenues.