Is it 20 percent of the profit or loss when you sell? Then it is similar is like Capital Gains, and you will need to track the prices at which you bought and sold (to calculate the profit or loss) and the order in which you are selling.
Best to set the tracking earlier rather than having a headache later!
It's 20% of the profot when you sell and the website decides or tracks the buy price. That's why you gotta white list. No whitelist means you pay 20% of the sales price.
You were Korea, was that right?
Correct. Still here.