The online help that should be improved is the following:https://turbotax.intuit.com/tax-tips/state-taxes/multiple-states-where-to-file/L5NxnNH21The underlined ...

Here is the part about out-of-state contractors needing to pay tax on income if the purchaser of the service receives the benefit of the service in California. ...

Here is a better way to word this from the publication for California:https://www.ftb.ca.gov/forms/2019/2019-1031-publication.pdfNonresidents of California are ...