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Kohei Wataguchi | Zagdim Global Experts
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ZagdimGlobal Experts
Tokyo, Japan

Kohei Wataguchi

渡口宏平
Zeirishi (licensed tax accountant)Verified by Zagdim · 7 Nov 2026
Suinas Tax Corporation
Kohei Wataguchi
Practice areas
Japanese consumption tax, Tax on Japanese property income for overseas owners
Languages
Japanese, Mandarin Chinese

Suited toIndividuals living abroad with a rental property in Japan, and overseas companies with a Japanese company that needs bookkeeping and tax filing, who can work in Japanese or Mandarin.

Ask firstWhether any of the work can be handled in English, and how small or one-off engagements are charged.

Whether the firm can take on a particular case is for the firm to confirm.

Personal licenceRegistered zeirishi (Japan Federation of Certified Public Tax Accountants' Associations)Verified by Zagdim · 7 Nov 2026FirmSuinas Tax Corporation: registered tax accountant corporationVerified by Zagdim · 7 Nov 2026See credentials and sources ›
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How to read this profileVerified by ZagdimChecked by Zagdim against the official source, with the dateStated by the firmSupplied by the firm or the professionalWhat verification means ›
01

Identity and credentials

CredentialRegistryStatusChecked onSource
Zeirishi (tax accountant)Japan Federation of Certified Public Tax Accountants' AssociationsOn the register. Office: 税理士法人Ｓｕｉｎａｓ (Shibuya-ku, Tokyo), as written on the register7 November 2026The federation's zeirishi search site (税理士情報検索サイト)

A Zagdim check confirms that the entry exists and what it showed on the day we looked. It is not an endorsement by the regulator, and it does not mean the firm is right for every case. Where the official source gives no information, we write “not stated by this source”. What verification means

02

Practice areas and service details

Japanese consumption taxTax on Japanese property income for overseas owners
Clients
Individuals living abroad who own property in Japan; overseas companies with a Japanese company
Individual or corporate work
Both
Working languages
Japanese, Mandarin Chinese
Area covered
Japan, from the Tokyo officeStated by the firm · Suinas website
03

Background and firm

Suinas

Suinas Tax Corporation

Current role · Tokyo

  • Began at KPMG AZSA LLC, KPMG's member firm in Japan, then worked at an international accounting firm in Myanmar. Returned to Japan and took part in founding Suinas.Stated by the firm · Suinas website
View firm profile
04

On Zagdim

  1. 16 October 2026Own Property in Japan From Overseas? Brokerage Fees Now Carry 10% Consumption TaxInterviewed on which fees are affected, with a table of the charges. Quotes were approved before publication.

More on this topicJapan: tax and accounting for overseas owners ›

05

Sources and upkeep

Last verified
7 November 2026
Next review
by 7 November 2027

Sources

  • Zeirishi search site of the Japan Federation of Certified Public Tax Accountants' Associations (checked 7 November 2026)Official source
  • The firm's website, suinas.comStated by the firm
  • Zagdim interview, final text of October 2026Stated by the professional · Zagdim interview
  • Information the firm gave Zagdim (13 October 2026)Stated by the firm

How profiles are built and how often they are reviewed: How Zagdim builds and maintains the directory | What verification means

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