on Sale price-cost of the flat basis STCG tax is payable if it's a real estate and without holding it for mandatory 3 years period you want to sell it if you make profit out of sale within 3 years of acquisition/purchase the profit is liable to short term capital gain tax.
short term capital gains do not benefit from any special tax rate – they are taxed at the same rate as your ordinary income. For 2016, ordinary tax rates range from 10 percent to 39.6 percent, depending on your total taxable income.
If you sell an asset you have held for one year or less, or residential house for less than 3 years any profit you make is considered a short-term capital gain. The clock begins ticking from the day after you acquire the asset up to and including the day you sell it.