After registering a One Person Company online in India, the following compliances must be maintained:

Annual General Meeting (AGM): While OPCs are exempt from holding AGMs, they must still file annual returns.
Annual Financial Statements: File financial statements, including a balance sheet and profit & loss account, with the Registrar of Companies (RoC).
Income Tax Returns: Submit annual income tax returns to the Income Tax Department.
GST Registration and Filing: If applicable, obtain GST registration and file regular GST returns.
Board Meetings: Conduct at least two board meetings annually, with a minimum gap of 90 days between each.
These compliances ensure that the OPC operates within the legal framework and avoids penalties.
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