Capital gains reinvestment deadline: invest within prescribed period or deposit unutilized gains in the capital gain account scheme. The capital gain for the Section 54G exemption must be used for the specified purposes within one year before or three years after the transfer. Capital gain not utilized within one year before transfer or not applied for the specified purposes on or before the due date for furnishing the return must be deposited in a bank under the capital gain account scheme on or before that due date.