You can start the process of closing your business by filing on INBiz.
Please note that closing your business in INBiz will only end your obligations to the Secretary of State's office. You are responsible for properly closing the business with all other agencies in which your business is registered.
For more help, please visit INBiz for more information about closing your business, as well as some additional actions to consider:
https://inbiz.in.gov/business-filings/close-business