Dear Sir,
1. The assets and liabilities needs to be disclosed at cost.
2. With respect to the tax implication, one of the implication could be that the source of asset can be asked for at the time of Assessment. This is just a tool to check that your assets are by and large in proportion to your income.
Please feel free to revert/call in case of any doubts.
Thanks and Regards,
CA Abhishek Dugar