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Live in California but work for Illinois-based company
California and New York are very aggressive when it comes to revenue and taxes. As such, mere having an employee in these States creates a nexus and tax/filing liability for the company. @Adam Wood mentioned sales tax - that is correct. Having an employee in the State of California will require collecting sales tax for CA, and if until now your employer didn't have to - that would be a good enough reason to refuse your request. In addition to sales taxes, there's also the issue of corporate filings (they will now have to file paperwork in CA and pay CA franchise taxes just because of you) and payroll taxes (which are pretty high in CA and NY). It will also subject the to CA/NY/WA labor laws, which are more liberal than in most of the other States. Washington doesn't have personal income tax, but does have corporate income tax and sales tax, so I'm guessing the reasons to exclude this State are the same.