Thanks for your contribution to this thread btw, 90% of our info comes from you I'm curious, If you buy it as a tourist can you not pay the 10% Tax? and If you do, I assume you pay full VAT when you land back home?
Overseas tourists who do not consume the goods in Japan can purchase them without 10% tax and no need to pay as long as they use the goods outside Japan.
There are several conditions:
1) you should buy it in the shops with a "tax-free" sign
2) the purchased price in a shop in a day must be between 5,000 - 500,000 JPY
3) you should show your passport at the shop counter
4) you must not open the box until you leave Japan.
When you leave japan, you should take the goods to customs. Should you put the goods as checked-in baggage, let the airport staff know the fact at the check-in counter. The customs officer will check the goods (the info about your tax-free purchase is sent electrically to the custom from the shops).
For condition 1), almost all of the large electric/electronics shops have the tax-free signs, including e-earphone (the largest headphones/IEM shop in Akihabara) and fujiya-avic (famous hi-fi audio shop in Nakano) .
See this website for more info.
https://livejapan.com/en/article-a0000238/
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