Japan's Electronic Bookkeeping Act, Explained Simply for Business Owners

The Electronic Bookkeeping Act (denshi-chobo hozon-ho, often shortened to denchoho) sets out rules for how tax-related books and records must be preserved when kept in electronic form. Many business owners assume it is purely an accounting matter that doesn't concern them, but in practice it touches almost any company, regardless of size, that exchanges invoices or receipts by email or through a cloud service. This article lays out the general framework of the law in plain terms for business owners. The specific requirements, any grace-period provisions, and whether a given case is covered can change with amendments, so please confirm the details with the National Tax Agency's official materials or your tax accountant. This article is background information for understanding the overall picture, not a basis for tax decisions.

This topic has become more relevant as invoices and receipts increasingly arrive as email attachments or through cloud services rather than on paper. Documents that used to arrive physically now often arrive as data, and rules for how to preserve that data have been developed accordingly. This isn't only an accounting-department issue — sales staff and business owners who routinely exchange documents with partners by email or online services are affected too, so understanding the broad outline is worthwhile even outside the finance function.

The law is generally organized into three categories, each covering different types of documents and different approaches to preservation. It helps to start with the big picture.

- Electronic bookkeeping preservation: Books and records that were created electronically from the start (e.g., in accounting software) can be kept as electronic data (optional)
- Scanned-document preservation: Paper invoices and receipts can be captured with a scanner or smartphone and kept as image data (optional)
- Electronic transaction data preservation: Transaction information exchanged electronically, by email or through a cloud service, must be preserved as electronic data (mandatory)

A key distinction among the three categories is that electronic bookkeeping preservation and scanned-document preservation are treated as optional, while electronic transaction data preservation is considered mandatory for companies that have transaction data exchanged electronically. In other words, a paper invoice can still be kept on paper as before, but printing out a PDF invoice received by email and keeping only the paper version is, in principle, moving toward being disallowed. That said, the scope of covered transactions, the preservation requirements (such as searchability or the need for timestamps), and the conditions under which grace measures for small businesses apply all depend on individual circumstances and have been revised repeatedly. Please confirm what specifically applies to your company through the National Tax Agency's official materials or your tax accountant.

Where SMBs tend to struggle is in judging how far the rules actually apply to them, given how complex the system can appear. Because whether a response is required depends on the partner and the type of document involved, trying to act on fragmentary information without first grasping the overall picture can create more confusion, not less. And in a company where only one person handles accounting, or where the owner does it themselves, simply keeping up with regulatory changes can become a burden in itself.

Each approach has trade-offs, and the realistic choice depends on transaction volume, staffing, and budget. Whichever approach is chosen, the final judgment on whether your company's actual practice meets the preservation requirements should be confirmed with a tax professional.

- Denchoho does not mean eliminating all paper: Keeping paper documents that were received on paper is not itself prohibited
- Non-compliance does not necessarily mean an immediate penalty: Treatment depends on the specific circumstances, and the rules have been revised repeatedly, so it is important to check current information with the National Tax Agency
- You do not always need an expensive system to comply: Companies with a small number of transactions may be able to comply through internal rules alone, in some cases
- This is not only an accounting problem: Staff outside accounting, such as sales staff who exchange invoices by email, are also affected

- Have you identified which invoices, receipts, and similar documents your company exchanges electronically?
- Have you decided where and how electronic data will be stored (folder structure, rules)?
- Do you understand your current state regarding searchability (by date, amount, counterparty, etc.)?
- Have you considered whether accounting software or a dedicated service is needed?
- Have you confirmed your company's status with your tax accountant?
- Do you have a routine for checking the National Tax Agency's official site for regulatory updates?

There is no need to be overly anxious about the Electronic Bookkeeping Act once you understand its broad outline. The key point is that transaction data exchanged electronically is, in principle, meant to be preserved electronically, and beyond that, the right posture is to confirm your company's specific obligations and requirements with the National Tax Agency's official materials or your tax accountant. For related practices around invoices, see Rethinking Invoice Operations as Japan's Invoice System Takes Hold. For the broader picture of IT risk management for SMBs, see A Guide to IT Risk Management for SMBs.