What is the meaning of stamp duty value and what is its relevance while computing capital gain in case of transfer of capital asset, being land or building or both?

Stamp duty value may be treated as deemed consideration for capital gains when it materially exceeds the actual sale consideration.

Stamp duty value is the value adopted or assessable by a State authority for stamp duty. For transfer of land or building, if actual sale consideration is lower than stamp duty value, the stamp duty value is treated as the full value of consideration for computing capital gains; from the relevant assessment year actual consideration is used where the stamp duty value does not materially exceed the actual consideration, otherwise stamp duty value is used.