"You'll get taxed on items bought on foreign e-commerce sites."
"You will have to pay tax on things you buy on foreign e-commerce sites."
"You'll get taxed on items bought on foreign e-commerce sites."
"You'll get taxed on ~" 「〜は税金を取られるよ」
"items" 「品物」
"bought" 「買った」
"on foreign e-commerce sites" 「海外のECサイトで」
"foreign" 「海外」
["e-commerce" 「EC」](https://eikaiwa.dmm.com/uknow/questions/92599/)
"sites" 「サイト」
"You will have to pay tax on things you buy on foreign e-commerce sites."
"You will have to pay tax on ~" 「〜は税金払わないといけません」