Koshida Accounting and Tax Office

Why Choose the Koshida Firm for Accounting and Tax Services in Japan?

Taisei Koshida, the firm’s representative and a certified public accountant in Japan, brings extensive experience and expertise in both domestic and international taxation.
Before founding the firm in 2008, he worked for Tohmatsu (now Deloitte Touche Tohmatsu LLC) for eight years, where he gained extensive experience in accounting, auditing, and corporate advisory services.
Today, he supports a wide range of foreign clients—both individuals and companies—by providing accounting and tax services in English. His practice focuses on international taxation, cross-border transactions, and compliance for foreign residents and businesses operating in Japan.
In addition, he has established a reliable network of English-speaking professionals, including lawyers, real estate agents, and web developers. This allows clients to receive comprehensive, one-stop support for business setup, legal matters, and operations in Japan.

■Service Lines

We provide practical accounting and tax services in Japan for corporations, entrepreneurs, and individuals, including foreign clients who need support in English.

● For Corporations

• Bookkeeping and preparation of accounting records
• Preparation and filing of corporate tax returns
• Preparation and submission of required tax documents
• Corporate tax planning and advisory services
• Representation and support during tax audits
• Practical tax-saving strategies and compliance support
• Assistance with opening a corporate bank account

● For Individuals

Including non-business individuals, non-permanent residents, U.S. LLC owners, and overseas property owners.

• Preparation and filing of individual Japanese tax returns (kakutei shinkoku / 確定申告)
• Preparation and submission of the Statement of Assets and Liabilities
• Foreign Asset Reporting (Overseas Asset Report)
• Tax planning and advisory services
• Practical tax-saving advice
• Tax payment agent services

● International Tax and Accounting in Japan

I also assist foreign residents with Japanese tax issues involving overseas income and assets. These cases include U.S. LLCs, U.S. stocks, overseas rental income, U.S. Social Security, Traditional IRAs, Roth IRAs, IRA conversions, foreign tax credits, and remittance-based taxation for non-permanent residents.
For U.S. citizens and other individuals moving to or living in Japan, the first questions often involve Japanese tax residency, non-permanent resident status, which overseas income is taxable in Japan, and how remittances to Japan affect taxation.
For a practical overview, see my U.S. Income Tax in Japan Guide. Moving to Japan? How Your U.S. Income Is Taxed in Japan

■Service Prices

We offer transparent and practical accounting and tax services in Japan for both individuals and companies. We also support non-business individuals, U.S. LLC owners, and individuals with overseas real estate income, with all services available in English.

●For Individuals (Including Non-Business Individuals, U.S. LLC Owners, and Overseas Property Owners)

1. Preparation of Individual Tax Returns

From approximately JPY 100,000 per year

We handle tax return preparation for a wide range of clients, including:

Non-business individuals

• ・U.S. LLC owners with cross-border income
• ・IRA conversions
• ・Individuals earning income from overseas real estate (e.g., U.S. rental income)

This service assumes that clients prepare their own bookkeeping records where applicable.

2. Monthly Tax Advisory Services

From approximately JPY 28,000 per month

This service includes support for setting up and maintaining a bookkeeping system.
We prepare accounting records and tax return documents that can stand up to tax audits, and provide practical advice on tax-saving strategies.

●For Companies

Monthly Tax Advisory Services for Corporations

From approximately JPY 35,000 per month

This service includes the same scope as our advisory service for individuals, including bookkeeping support, preparation of proper accounting records, and tax planning advice.

■About Koshida Accounting and Tax Office

When the COVID-19 pandemic spread around the world and everything went into lockdown, I wanted to start something new and bring some change into my life.

So I started doing things I had always been interested in: learning English, playing the piano, Aikido, and pantomime. I still enjoy studying English and playing the piano every day.

At the time, I never imagined that English would eventually become an important part of my work.

As I continued learning English, I began to feel that I wanted to actually use it.

Then I realized that my own profession, where I already had more than ten years of experience as a Certified Public Accountant and Licensed Tax Accountant, might be the perfect place to do that.

Gradually, I started receiving inquiries from foreign residents and foreign business owners in Japan. Today, I regularly help foreign clients with Japanese accounting and tax matters, including international tax issues involving income and assets outside Japan.

■Supporting Foreign Individuals and Business Owners in Japan

I want to support people who like Japan and want to start a business here. At the same time, by meeting people with different cultures and values, being inspired by them, and thinking more deeply, I want to stay connected with the wider world rather than closing myself off in my own small world.

My clients include foreign entrepreneurs running businesses in Japan, non-permanent residents, U.S. LLC owners, and individuals with overseas income, investments, real estate, pensions, and other cross-border tax issues.

Today, U.S. citizens make up the largest group among my foreign clients. Their Japanese tax matters often involve U.S. LLCs, U.S. stocks, rental income, Social Security, retirement accounts, foreign tax credits, and remittance-based taxation.

For business clients, I provide practical support with bookkeeping, corporate tax returns, tax planning, withholding tax, consumption tax, payroll-related tax procedures, and tax audits.

■A Small Accounting Firm with a Professional Network

Koshida Accounting and Tax Office is a small accounting firm. I communicate directly with my clients and try to maintain a friendly, practical, and easy-to-talk-to relationship.

My main areas are accounting and tax, but foreign clients often need help with matters outside my professional scope. When necessary, I work with other English-speaking professionals who can assist with company registration, visas, social insurance, legal matters, and other procedures.

I started my career at Tohmatsu in 2000 and opened my own accounting office in 2008. I am both a Certified Public Accountant and a Licensed Tax Accountant in Japan.

■Working with Clients in English

English is not my native language. I started learning it during the pandemic, and I still enjoy studying it every day.

What began simply as a personal hobby gradually became part of my professional life. Through English, I have met people from many different countries and become involved in accounting and tax issues that I probably would never have encountered otherwise.

If you live in Japan, are planning to move to Japan, or run a business here and need help with Japanese accounting or tax matters, please feel free to ask me in English.

I can’t help but admire the challenge and courage it takes to start a business in a foreign country like Japan.

I would be very happy if I could use my professional knowledge and experience to support you and your business.

If you have any questions, please feel free to contact me.

And as for the piano—these days, I can play about four pieces, including classical and contemporary music.