Navigating Japan's Electronic Bookkeeping Act: An Easy Guide

Japan's Electronic Bookkeeping Act (電子帳簿保存法, denshi chobo hozon ho) governs how companies store tax-related books and documents electronically. The law is officially Act No. 25 of 1998, and the National Tax Agency enforces it. Enforcement tightened in January 2024, after a two-year transitional measure ended.

The Electronic Bookkeeping Act, also called the Electronic Book Preservation Act, applies to every company and sole proprietor in Japan. It covers general ledgers, invoices, and electronic transaction records, including data sent through electronic data interchange (EDI). This guide explains what the law requires, what changed in 2024, and how your business can stay compliant.

What is Japan’s Electronic Bookkeeping Act (電子帳簿保存法)?

Japan's Electronic Bookkeeping Act lets businesses store tax-related books and documents electronically. This includes general ledgers, invoices, and financial statements. Businesses no longer need paper backups for these records.

Some documents fall outside this act. Handwritten ledgers and handwritten invoices are two examples. Businesses must keep the original paper copies of these documents.

What changed under the 2024 Electronic Bookkeeping Reform?

The revised Electronic Bookkeeping Act took effect on January 1, 2022. This revision removed the old prior-approval requirement. It also introduced a new rule: companies must preserve electronic transaction records in their original digital format.

A two-year transitional measure (宥恕措置, yūjo sochi) softened this rule at first. The measure let companies keep printing and storing paper copies as a stopgap. That grace period ended on December 31, 2023.

From January 1, 2024, the rule became mandatory with no exceptions. Companies can no longer rely on paper printouts for electronic transaction data. The reform aimed to modernize Japan's tax reporting system and reduce paper-based bookkeeping.

Before 2022, businesses needed a tax office's prior approval to store any records electronically. The 2022 revision removed that approval step for electronic ledgers and scanned documents. It also set the searchability and tamper-proof requirements this guide covers below.

3 types of electronic storage required under Japan's ERRL

Three types of electronic storage are affected by this law. The table below compares them at a glance.

i. Electronic ledger and document storage

This type of storage refers to any created and stored digital data on the computer or cloud for easy access and maintenance, including physical media storage like DVDs and hard disks.

Two types of tax-related categories fall under this storage:

• Tax-related books: such as journals, general ledgers, and cash books.

• Tax-related documents: these include financial settlements (balance sheets, profit and loss statements, and inventory) and copies of transactions (receipts, invoices, and purchase orders). 

ii. Scanner-based document storage

This type of storage refers to documents that were previously in physical format but are preserved as digital storage.

In terms of tax-related documents, all transaction evidence is scanned, such as receipts, invoices, and purchase orders.

Once scanned, these documents need proof they haven't been altered. The detailed requirements, including timing, resolution, and tamper-evidence, are covered below.

Scanner-based storage requirements

Scanner-based storage lets you digitize paper receipts, invoices, and purchase orders. Japan sets specific technical rules for this method. Four requirements apply:

• Resolution: scan at 200dpi or higher. For an A4 page, this is about 3.87 million pixels.

• Color: use full color for important documents, such as contracts, invoices, and receipts. General documents can use grayscale.

• Timing window: scan within about 7 business days of creating or receiving the document. Businesses with a documented processing cycle can extend this to within 2 months, plus about 7 business days.

• Tamper-evidence: attach a timestamp within the timing window, or use a system that logs or blocks corrections and deletions.

Businesses must also keep a color display of at least 14 inches and a color printer on-site. This lets a tax auditor view and print any scanned record on demand.

The FY2023 tax reform simplified this rule starting January 1, 2024. Businesses no longer need to separately log the resolution, color depth, or file size of each scan. They also no longer need to record who performed each scan.

MailMate's bookkeeping service keeps your reconciled books and audit trail in one place. This gives you Japanese-compliant records ready whenever a tax office asks.

iii. Electronic transaction data storage

Any documents and transactions received and electronically saved fall under this type of storage, such as electronic payment, email data, and EDI (Electronic Data Interchange) transactions. 

As long as these saved files are in a tamper-proof storage system, there is no need for timestamp history.

Additionally, any invoice storage system, must comply with the Electronic Bookkeeping Act in Japan and the Qualified Invoice System.

👉 Learn more about qualified invoices and qualified invoice issuing businesses.

Tamper-proof storage requirements

This requirement applies specifically to electronic transaction data storage. Japan's Electronic Bookkeeping Act requires proof that this data stays unaltered. Businesses must pick one of four accepted methods to prove this.

• Receive with a timestamp already attached: accept data that already carries a certified timestamp from the sender.

• Attach a timestamp promptly after receipt: add a certified timestamp yourself, without delay, once you receive the data.

• Use a tamper-evident system: store data on a system that either logs every correction and deletion or blocks corrections and deletions entirely.

• Adopt internal control procedures: put written rules in place that ban unauthorized changes and require sign-off on edits.

Small and medium businesses often prefer the internal control procedures method. It is the most cost-effective way to meet this requirement, since it does not require new software.

Searchability and record organization rules

All electronic records must stay searchable. Japan's National Tax Agency calls this the 3要素 (three elements) rule.

The three required search fields are:

i. Transaction date (取引年月日): the exact date of the transaction.

ii. Transaction amount (取引金額): the exact amount recorded.

iii. Counterparty (取引先): the name of the other party in the transaction.

Businesses must organize digital records by these three fields. A clear file-naming method makes this easy. For example, "2024-03-15_Inv#1234_K-Corporation.pdf" names the date, invoice number, and counterparty in one file name.

Electronic submission for tax audits in Japan

The new reform introduces electronic submission of reports and documents to any tax authorities for more streamlined audit and compliance checks.

JIIMA certification and the Digital Seamless Software category

JIIMA (公益社団法人日本文書情報マネジメント協会) is Japan's Information Management Association. JIIMA certifies commercial software against the Electronic Bookkeeping Act's requirements.

The National Tax Agency does not require JIIMA-certified software. But most businesses use a JIIMA-certified product, since it is the simplest way to prove compliance.

Japan's 2025 tax reform added a new certification tier, called Digital Seamless Software. This tier covers tools that connect invoicing, storage, and search functions into one seamless system.

Businesses that adopt JIIMA-certified software reduce their audit risk. Certified products already meet the tamper-proof and searchability rules covered above.

Which businesses are exempt from the search requirement?

Not every business needs to meet the full searchability rule. Japan sets a revenue-based exemption.

Businesses with base-period revenue of ¥50 million or less qualify for this exemption. This threshold rose from ¥10 million after the FY2023 tax reform. Businesses above this threshold must still meet the full three-element search rule.

Even exempt businesses must still preserve their electronic records. The exemption only removes the search-function requirement. It does not remove the duty to store and preserve the underlying data.

Penalties for non-compliance with Japan's Electronic Bookkeeping Act

Additional payments 

There are higher penalties when businesses do not complete these new electronic storage requirements.

Under Article 8, paragraph 5, of the Electronic Bookkeeping Act, businesses that fail to maintain compliant electronic records may face a 10% additional tax assessment on underreported income identified during an audit. Non-compliant businesses also lose eligibility for the Blue Return (青色申告) tax deductions, which can be worth up to ¥650,000 annually for sole proprietors.

Loss of tax benefits

Not complying can also result in loss of tax benefits, such as deductions or credits.

Rising audit scrutiny in 2026 and 2027

Japan's National Tax Agency is increasing its focus on electronic transaction data. Tax audits now routinely check e-transaction preservation practices.

The National Tax Agency identifies over 10,000 fraudulent-calculation cases every year. Businesses that still rely on the old transitional measure face growing scrutiny in 2026 and 2027.

Do not treat the transitional measure as a permanent solution. Enforcement has tightened, and audits increasingly test whether businesses preserved records the correct way.

Frequently asked question

What is Japan's Electronic Bookkeeping Act?

Japan's Electronic Bookkeeping Act (電子帳簿保存法) is Act No. 25 of 1998. It sets the requirements for how companies and sole proprietors store tax-related electronic records. The law covers three categories: electronic ledger storage, scanner-based storage, and electronic transaction data storage. It has been in full enforcement since January 2024.

Who does the Electronic Bookkeeping Act apply to in Japan?

All companies and sole proprietors operating in Japan must comply with this law. This includes businesses that store general ledgers, journals, and cash books. It also includes businesses that process electronic transactions through EDI or email. Businesses with base-period revenue of ¥50 million or less get a partial exemption from the search requirement only.

What documents must be stored electronically under Japan's ERRL?

Tax-related books such as general ledgers, cash books, and journals must be stored electronically. Transaction documents like receipts, invoices, and purchase orders also fall under the law, if they were created or received electronically. Handwritten ledgers and invoices are not covered, so businesses must keep the original paper copies of those.

What are the tamper-proof requirements under the Electronic Bookkeeping Act?

This requirement applies to electronic transaction data specifically. The law requires proof that this data stays unaltered, and businesses can choose from four accepted methods, including a timestamp method and internal control procedures. Internal control procedures are often the simplest and lowest-cost option for small businesses.

How must electronic records be organized to meet Japan's searchability requirements?

Records must be searchable by three required fields, known as the 3要素. These fields are transaction date, transaction amount, and counterparty. A consistent file-naming method, such as including the date and invoice number, makes this requirement easy to meet.

What are the technical requirements for scanner-based storage?

Scanned documents must meet a 200dpi resolution requirement, or about 3.87 million pixels for an A4 page. Important documents like contracts and invoices need full color; general documents can use grayscale. Businesses must scan within about 7 business days of receipt, or within a documented processing cycle of up to 2 months plus 7 business days. A timestamp or tamper-evident system is required within that window.

What are the penalties for non-compliance with Japan's Electronic Bookkeeping Act?

Non-compliant businesses can face a 10% additional tax surcharge on underreported income found during an audit. They also lose eligibility for the Blue Return deduction, worth up to ¥650,000 a year. Enforcement has tightened since 2024, and audits increasingly test whether businesses preserved records correctly.

What is 優良な電子帳簿 (excellent electronic books)?

優良な電子帳簿 (yuryou na denshi chobo) is a voluntary, higher standard under Article 8, paragraph 4, of the Electronic Bookkeeping Act. Businesses that meet this standard get a 5 percentage point reduction on the underreporting penalty tax, which normally runs 10% to 15%. Qualifying requires filing a notification with the local tax office in advance. This status also supports the full ¥650,000 Blue Return special deduction.

What is the difference between Japan's Electronic Bookkeeping Act and the Qualified Invoice System?

The Electronic Bookkeeping Act governs how electronic records and tax-related books must be stored and preserved. The Qualified Invoice System is a separate law that sets what information an invoice must contain for consumption tax purposes. Any invoice storage system must comply with both laws to meet Japan's full tax reporting requirements.

In closing

Japan's Electronic Bookkeeping Act reflects a broader shift toward digital tax reporting. The rules keep evolving, from the 2025 JIIMA Digital Seamless Software certification to the ¥50 million exemption threshold.

Compliance pays off beyond avoiding penalties. Businesses that qualify for 優良な電子帳簿 status get a real reward: a 5 percentage point reduction on the underreporting penalty tax.

Review your storage method today, and confirm it meets the 3要素 search requirement. A compliant system now protects your business from the rising audit scrutiny expected in 2026 and 2027.