While "doing nothing" with your core portfolio is the primary message for most investors during a war-driven downturn, there is one strategic action that can actually benefit you: tax-loss harvesting. This technique involves selling an investment that has experienced a loss to realize that loss for tax purposes. The loss can then be used to offset capital gains you may have realized elsewhere, or even to offset up to ₹50,000 of other income per year under current rules.