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What should I do with my freshly opened LLC in California after I've moved?
There's no reason to keep the California LLC if you don't intend to do business in California.  If you'll have sales in California then you'll need to keep it and file taxes accordingly for those sales.  You can just as easily form a new LLC in Washington state and even keep the same name (if it's available in Washington, that is). Keeping the California LLC just creates paperwork for whatever regulatory filings California will require for no purpose at all.   As for your question about it looking suspicious that you just set up an LLC and then are shutting it down, nobody's going to care, to be honest.  As with your situation, plans change, so it isn't really all that unusual.  If you're concerned the government will say something, don't.