No, you do not have to final a return for 2018 provided you do not have any income, expenses, or conduct business in 2018.
File the appropriate dissolution, surrender, or cancellation forms with the California Secretary of State ("SOS") within 12 months of filing your final tax return. To get the applicable forms, go to the SOS website at sos.ca.gov, and search for terminate entity, or call 916.657.5448.
For more information regarding closing a business in California, please visit the following website:
https://www.ftb.ca.gov/businesses/faq/Closing_a_Business_Entity.shtml
