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Certified Mail in Japan: Format, Fees, and Templates

This guide explains how to prepare and send certified mail in Japan, including format rules, fees, and practical template use. It helps you preserve evidence effectively when dealing with real estate disputes.

Last updated: About 1 min read

Certified mail is a postal service in which the post office certifies the content of a letter, the mailing date, and the delivery date. It serves as effective evidence in resolving real estate disputes and in legal procedures.

How does certified mail work, and what is its role?

With certified mail, you can obtain official proof of mailing and delivery by bringing the original document and two copies to the post office. In addition to being used as evidence, it can also function as psychological pressure on the other party.

Mailing costs

MethodTotal cost
Electronic certified mail serviceAbout 1,470 yen
Post office counterAbout 1,220 yen

What are the formatting rules for certified mail?

Paper and preparation method

It can be prepared either by hand or on a computer. With a computer, you can use a template to prepare it efficiently.

Character and line limits

  • Vertical writing: up to 20 characters per line and up to 26 lines per page
  • Horizontal writing: up to 20 characters per line and up to 26 lines per page (the most common format)

If the document runs to two or more pages

A seal across the page break is required between pages (using the same seal as the one placed beside the signature or name).

How to correct a writing mistake

Cross it out with a double line, then write “○ characters deleted” in the margin and affix your seal. If you add text, write “○ characters deleted, ○ characters added.”

What are the advantages and disadvantages of electronic certified mail (e内容証明)?

Advantages

  • Can be sent anytime, 24 hours a day
  • No need to go to the post office
  • No seal or page-break seal required
  • More economical when there are many pages

Disadvantages

  • Credit card payment only
  • Limited to Microsoft Word format
  • Relatively expensive if there is only one page

Frequently Asked Questions (FAQ)

Q. In what situations is certified mail used?

It is widely used in real estate matters, including demands for overdue rent, notices of contract termination, and claims for rent reduction.

Q. What happens if the other party refuses to accept it?

If it is sent with proof of delivery, there are cases where the declaration of intent may still be regarded as having reached the recipient even if acceptance is refused.

Q. Should I ask a lawyer to handle it?

If the content is complex or may develop into legal proceedings, it is prudent to consider engaging a lawyer.

Daisuke Inazawa, President & CEO of INA&Associates Inc.

Author

President & CEOINA&Associates Inc.

President & CEO of INA&Associates Inc. Leads real estate brokerage, rental leasing, and property management across Greater Tokyo and the Kansai region. Specialises in income-property investment strategy and advisory for ultra-high-net-worth individuals.

Daisuke Inazawa is the President and CEO of INA&Associates Inc., a Japanese real estate firm headquartered in Osaka with a Tokyo branch. He leads the company's three core businesses — real estate sales brokerage, rental leasing, and property management — across the Greater Tokyo Area and the Kansai region.

His areas of expertise include investment strategy for income-generating real estate, profitability optimisation of rental operations, real estate advisory for ultra-high-net-worth individuals (UHNWIs) and institutional investors, and cross-border real estate investment. He provides data-driven, long-horizon advisory to investors in Japan and overseas.

Under the management philosophy "a company's most important asset is its people," he positions INA&Associates as a "people-investment company" and is committed to sustainable corporate-value creation through talent development. He also writes and speaks publicly on leadership and organisational culture in times of change.

He has passed eleven Japanese professional qualification examinations: Licensed Real Estate Broker (Takken), Certified Real Estate Consulting Master, Licensed Condominium Manager, Licensed Building Management Supervisor, Certified Rental Housing Management Professional, Gyōseishoshi Lawyer (administrative scrivener), Certified Personal Information Protection Officer, Class-A Fire Prevention Manager, Certified Auctioned Real Estate Specialist, Certified Condominium Maintenance Engineer, and Licensed Moneylending Operations Supervisor.

  • Licensed Real Estate Broker (Takken)
  • Certified Real Estate Consulting Master
  • Licensed Condominium Manager
  • Licensed Building Management Supervisor
  • Certified Rental Housing Management Professional
  • Gyōseishoshi Lawyer (Administrative Scrivener)
  • Certified Personal Information Protection Officer
  • Class-A Fire Prevention Manager
  • Certified Auctioned Real Estate Specialist
  • Certified Condominium Maintenance Engineer
  • Licensed Moneylending Operations Supervisor