The buyer withholds on the WHOLE sale value — not the gain — unless you act first verified
When the seller is a non-resident, the buyer must deduct tax at the rates in force, and in practice on the gross sale consideration unless the seller holds a lower/nil-deduction certificate. For long-term gains (transfer on or after 23 July 2024) the base rate is 12.5 percent without indexation, plus surcharge by slab (nil below fifty lakh rupees of consideration, 10 percent to one crore, capped at 15 percent above) plus 4 percent cess — roughly 13 to 15 percent of the FULL value withheld. Short-term gains withhold at slab rates.