Taxation change / capital gain for non-permanent resident

The taxation for non permanent resident is changed in 2017. The taxation for capital gain on the sales of stock listed outside Japan was non taxable if the sales proceed is paid outside JP.

However the taxation is changed as follows.

~Dec 2016 … Non taxable if sales proceed is paid outside JP

Jan~Mar 2017 … Taxable

Apr 2017~   … Taxable if the stock is purchased after Apr 2017 and during non permanent period