Yes. Source: https://www.nta.go.jp/taxes/shiraberu/taxanswer/shohi/6902.htm#:~:text=%E6%A6%82%E8%A6%81,%E3%81%93%E3%81%A8%E3%82%92%E7%BE%A9%E5%8B%99%E4%BB%98%E3

Yes. Source: https://www.nta.go.jp/taxes/shiraberu/taxanswer/shohi/6902.htm#:~:text=%E6%A6%82%E8%A6%81,%E3%81%93%E3%81%A8%E3%82%92%E7%BE%A9%E5%8B%99%E4%BB%98%E3%81%91%E3%82%8B%E3%82%82%E3%81%AE%E3%81%A7%E3%81%99%E3%80%82 https://www.nta.go.jp/taxes/shiraberu/taxanswer/shohi/6902.h... I agree, there are a lot of cases where they don't show the full prices. Especially in the recent years when they've been changing the consumption tax rapidly, and allowing shops to have some leeway. But online prices, almost everywhere, include tax. Even Shopify forces JP merchants to display them while selling in the area.