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Are You Paying Taxes You Don’t Owe?
The Hidden Tax Rules Affecting 140,000+ People in Japan By Mamiko Yamamoto, CPA (Japan & US), Licensed Tax Accountant Tokyo Advisory Co., Ltd. If you are reading this from a U.S. military base in Japan, an embassy in Tokyo, or if you are a Japanese citizen planning to return home after years abroad, you may be making costly tax mistakes. Conversely, you might be exempt from taxes you assume you owe. The complexity of Japan’s tax residency rules—and their critical exceptions—c
Mamiko Yamamoto
May 74 min read


The 5 Critical Mistakes Foreign Founders Make After Incorporating in Japan
(And How to Avoid Costly Tax Problems) Every year, many foreign entrepreneurs successfully incorporate a company in Japan. They receive their Certificate of Registered Matters , celebrate the new business, and believe the difficult part is over. In reality, incorporation is only the beginning . The most serious compliance mistakes often happen after the company is registered . Missing just a few required notifications can lead to: • Tax penalties• Loss of valuable tax benefit
Mamiko Yamamoto
Mar 215 min read


Japan's Cryptocurrency Tax Revolution2026
What Foreign Investors Need to Know Historic Shift from Aggregate to Separate Taxation - But Only for "Specified Cryptocurrencies" ⚠️ CRITICAL WARNING FOR ALL INVESTORS The new separate taxation system has a major hidden cost AND significant limitations: The Hidden Cost: While the tax rate drops from 55% to 20% on profits, crypto losses can NO LONGER offset your salary income. Current System: Crypto loss of ¥2M reduces your overall taxable income → immediate tax savings New
Mamiko Yamamoto
Jan 1816 min read
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