If your LLC is filing a Sch C:
1. It isn't filed until you have income
2. you will keep adding up expenses of "start up" until you have income. Then, you will add your bucket of "start up" expenses to your return. As long as your start up expenses are below $50,000 you can write off up to $5,000 the first year and amortize the rest.
3. Yes, same for state to start with.
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