Japan SaaS Compliance Guide: インボイス制度 and 電子帳簿保存法 for SMEs

The two laws you need to know

Japan had two major compliance changes hit simultaneously that fundamentally changed how SMEs must handle their financial workflows. Both laws are active now, and both affect your tool stack decisions.

The timing wasn't coincidental — these changes are part of Japan's broader push toward digitalization and improved tax compliance. For SMEs, this means you can't ignore either law, and your tool choices affect both.

インボイス制度: what it actually requires

The qualified invoice system creates a direct link between your registration status and your clients' tax deductions. Here's what you need to understand:

The registration decision

If you are a 課税事業者 (consumption tax registrant):

• You must register as an "Approved Invoice Issuer" (適格請求書発行事業者) and include your 登録番号 (T-number) on all invoices issued
• Your clients need your T-number to claim consumption tax input credits from your invoices
• Registration is not automatic — you must apply through the NTA portal and wait 2–3 weeks for approval

If you are a 免税事業者 (exempt from consumption tax, typically under ¥10M revenue):

• You can choose not to register — but your clients then cannot claim input tax credit from your invoices
• This makes you less competitive for B2B work, as clients effectively pay more to work with you
• Many 免税事業者 elect to register and become 課税事業者 to maintain competitiveness

Practical implementation

Once you're registered, the requirements are straightforward:

1. Update your invoice template to include your T-number (starts with "T" followed by 13 digits)
2. Verify vendors' T-numbers when recording expenses — your accounting software needs this to claim input tax credit
3. Use compliant accounting software — both freee and Money Forward handle qualified invoice issuance natively once you enter your 登録番号 in settings

The T-number verification issue most businesses miss: It's not enough to just put your T-number on invoices. You also need to collect and verify T-numbers from your vendors to maximize your own tax deductions. This is where your accounting software's vendor database becomes critical.

電子帳簿保存法: what it actually requires

The electronic bookkeeping preservation act has one core rule that affects most SMEs: electronic records you receive electronically must be stored electronically. This sounds simple but breaks a lot of existing workflows.

What counts as "electronic records"

• PDF invoices received by email — must preserve the original email and attachment
• Invoices downloaded from vendor portals — must preserve the original download, not a printed copy
• Digital receipts from SaaS subscriptions — the original receipt email or portal download
• Bank and credit card statements downloaded as PDF or CSV

Storage requirements

The electronic storage system must support:

• Search by date, amount, and counterparty name — manual filing in folders doesn't qualify
• Tamper evidence — timestamp verification and integrity protection
• Legal retention periods — typically 7 years for 法人, 5 years for 個人事業主
• Backup and recovery — data must be preserved even if the primary system fails

What this breaks

Common workflows that are no longer compliant:

• Printing PDF invoices and filing them in paper binders — you must keep the original electronic file
• Saving invoices to a Google Drive folder — lacks required indexing and tamper evidence
• Email forwarding to your accountant — unless they're using a compliant system for final storage
• Screenshot capture of vendor portals — screenshots aren't the original electronic record

The exception: paper receipts

Receipts for expenses under ¥30,000 can use smartphone photography under simplified rules. The photo must include timestamp and location data, and the app must provide tamper evidence. Most accounting software receipt capture features handle this compliance requirement.

The minimum viable compliance stack

For most Japan SMEs, a compliant setup requires these five steps, in order:

1. Register for インボイス制度 if you do B2B work and are a 課税事業者. Apply through the NTA portal — takes 2–3 weeks. If you're unsure about 課税事業者 status, check with your 税理士 first.
2. Update your invoice template to include your T-number. Both freee and Money Forward do this automatically once you enter your 登録番号 in settings. If you use custom templates, manually add the number.
3. Set up electronic document management for incoming invoices. Either use your accounting software's receipt scan/upload feature, or a dedicated tool like Sansan Bill One, ricori, or Concur Invoice.
4. Train staff on the electronic-to-electronic rule. Emailed PDFs and vendor portal downloads must go into the compliant system, not Downloads folders or paper files. This is usually the compliance failure point.
5. Verify your 税理士's workflow — their preference for receiving documents often overrides the theoretical minimum. Some prefer everything through their portal; others want clients to handle primary storage internally.

Tool options by function

freee vs Money Forward: compliance comparison

Both platforms are fully compliant with インボイス制度 and 電子帳簿保存法 for their core use cases. The differences are in ease of setup and workflow integration.

Compliance features: both platforms

• インボイス登録番号 support: Enter your T-number once, and it appears on all invoices automatically
• Compliant invoice output: PDFs include all required fields for qualified invoice compliance
• 電子帳簿保存法 storage: Uploaded documents are timestamped, searchable by required fields, and tamper-evident
• T-number verification: Automatic lookup and validation when adding vendors
• 税理士 integration: Dedicated portals for accountant access and document sharing

The practical differences

• Receipt capture: freee has a cleaner smartphone app interface; Money Forward's is functional but less polished
• Setup complexity: freee's compliance setup walks you through registration status and explains options; Money Forward assumes you know your obligations
• 税理士 preference: Some accounting firms have stronger relationships with one platform — ask your 税理士 which they prefer before choosing
• Document management: Money Forward has better integration with third-party document tools; freee wants everything in their ecosystem

For detailed platform comparison beyond compliance, see the freee vs Money Forward guide.

Common compliance mistakes

These are the most frequent compliance failures we see in SME audits, roughly in order of how often they happen:

1. Not registering for インボイス制度 despite doing regular B2B work. Many businesses assume registration happens automatically when they become 課税事業者. It doesn't. You must apply separately.
2. Issuing invoices without the T-number. Common with freelancers using custom Word or Excel templates, or businesses that updated their accounting software but didn't update manual invoice processes.
3. Storing electronic invoices in Google Drive folders. Looks organized, but lacks required search functionality and tamper evidence. The documents aren't indexed by amount or counterparty name.
4. Printing electronic invoices and filing them as paper. Staff receive a PDF by email, print it for the filing cabinet, and delete the original email. This breaks the electronic-to-electronic preservation requirement.
5. Missing vendor T-numbers. Your accounting software needs vendors' 登録番号 to record correct input tax deductions. Many businesses don't realize they need to collect this information.
6. Assuming compliance is the 税理士's responsibility. Your accountant can advise and handle tax filings, but the document storage and invoice issuance compliance is your operational responsibility.

The hidden cost of compliance mistakes: Non-compliance doesn't usually result in immediate penalties, but it creates problems during tax audits, vendor audits, and due diligence for investment or acquisition. The operational disruption when you have to reconstruct records retroactively is far more expensive than getting it right initially.

Foreign founders: additional considerations

As a foreign-owned 法人 or 個人事業主, the same compliance rules apply — there is no foreigner exemption. However, there are a few additional factors to consider:

Registration decisions

• 免税事業者 election: If your revenues are under ¥10M, you may qualify as 免税事業者 and can choose not to register for インボイス. However, this decision affects your B2B competitiveness — discuss the tradeoffs with your 税理士.
• English vs Japanese invoicing: Invoices can be in English, but the T-number and required fields must be clearly labeled. Many foreign businesses use bilingual invoice templates to be safe.
• International vendor relationships: Foreign vendors who don't have Japanese T-numbers cannot provide qualified invoices. This affects your input tax deduction calculations.

Additional compliance layers

• FBAR/FATCA considerations: If you are a U.S. citizen, business bank accounts in Japan have FBAR and FATCA reporting obligations. This is separate from Japanese tax compliance but affects which financial institutions you use.
• Transfer pricing documentation: If your business has related-party transactions across borders, you may need additional documentation beyond standard Japanese compliance.
• Language barriers with vendors: Japanese accounting software and vendor portals operate in Japanese. Budget time for translation or hire bilingual staff for compliance workflows.

Practical recommendations

Foreign founders usually benefit from working with a 税理士 who has other foreign clients, as they're more familiar with the intersection of Japanese compliance and international business structures. The compliance setup is the same, but the explanation and workflow design can account for language and cultural differences.

Frequently asked questions