The short-term capital gains tax applies to gains on the holding and sale of assets for less than 36 months. If a taxpayer holds a principal asset for three years or less before selling it, it is considered short-term capital. However, the holding period of some assets like equity-oriented mutual funds, debentures, and government securities listed on the Indian Stock Exchange is reduced to one year instead of three. For immovable assets like land or buildings, or unlisted shares, the holding period is 24 months instead of 36 months.