After Sole Proprietorship Registration, the proprietor must adhere to several compliance requirements:

Filing Income Tax Returns: The proprietor must file annual income tax returns.
GST Filing: If registered under GST, periodic GST returns must be filed.
Business Licenses Renewal: Renew any specific business licenses or permits as required.
Maintenance of Financial Records: Keep accurate and updated financial records of the business transactions.
Compliance with Local Laws: Ensure the business complies with local regulations, such as labor laws and environmental regulations.
https://www.registerkaro.in/sole-proprietorship-registration