Yes, when you set your price, in the Amazon.jp marketplace, on your app submission (under the “Availability & Pricing” tab), the list price is inclusive of the Japanese Consumption tax. Therefore, when you enter your app’s price, you should not add extra to cover the consumption tax.
If you would like your customers to pay 100 JPY for your app, you should simply enter in 100 JPY for the price of your app, not 108 JPY (list price + 8%).
Note: These taxes are deducted from the list price when calculating Royalties.
Keywords: Japan, jp, consumption tax, revenue, sales reports, pricing