If you send your money to a Japanese exchange today to buy Bitcoin, you are charged an 8% consumption tax that applies to all purchases of just about anything in the country. And yet, Japanese buyers are flocking to Bitcoin.
Recently, the law was changed to make purchases of Bitcoin exempt from the 8% tax. It will take effect on July 1st, 2017.
Now, imagine if you are in Japan and wanting to get into Bitcoin in late June. You will most likely wait for that 8% discount. Demand may fall a bit. And then, boom, July 1st hits. I know that exchanges are already struggling with the server load, and very concerned about this. For me, it means don't sell bitcoin until after July 1st.