KoguNavi

Invoice Registration Number & Corporate Number Checker

Check Japanese invoice registration number format and corporate-number check digits before accounting review or spreadsheet entry.

Conversion tools

What it helps with

  • Spot possible typos before entering invoice registration numbers
  • Check corporate-number check digits during accounting review
  • Normalize copied registration numbers before pasting into spreadsheets

How to use

  1. Paste one or more invoice registration numbers or corporate numbers.
  2. Choose whether to check invoice format or corporate numbers.
  3. Review the normalized value, result, and check digit note.
  4. Copy the TSV summary if you need to paste results into a spreadsheet.

Examples

Corporate invoice number

Input

T8700110005901

Output

Corporate-number check digit matches.

Typo candidate

Input

T7700110005901

Output

T + 13 digit format is valid, but the corporate-number check digit does not match.

Good to know

  • This tool does not confirm official invoice issuer registration status.
  • Non-corporate invoice registration numbers can share the same T + 13 digit format without matching the corporate-number check digit.
  • Use the National Tax Agency public site for official registration status confirmation.

FAQ

Does this confirm official invoice issuer registration status?
No. It checks format and corporate-number check digits only. Use the National Tax Agency public site for official registration status.
Why can a T + 13 digit number pass format but not the corporate check digit?
Non-corporate registered businesses also use T + 13 digits, but those digits are not necessarily a corporate number.
Is the input sent anywhere?
No. The check runs in your browser and does not call external services.

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