1)if the sale consideration as mentioned in the sale deed is lower than the circle rate, the stamp duty would be calculated as per the value prescribed for circle rate
2) section 50C of the Income-tax Act, 1961 clearly mentions that the liability on capital gains would arise on the value of the property as fixed by the state valuation authority .
Thus, capital gains tax would be calculated on the value of the property as fixed by the Stamp Valuation Authority especially when such value is higher than the declared value of the property as appearing in the sale deed