Do I have any reporting obligation towards NAV?

Yes. IBKR will provide you with a tax certificate until 31 January of the following year in the case of TBSZ termination or partial withdrawal from the TBSZ. You will be required to include the amount of the taxable income as per the IBKR tax certificate in your annual Personal Income Tax return.

Additional Information

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What tax forms do you provide for my RSP account?
How do I pay the tax?
RRIF Tax Reporting
What happens if the 5-year period expires, and I do not submit my statement?