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Validate Japan TIN (My Number)

Free online My Number (個人番号) validator. Instant validation using OECD-compliant rules for Japan tax identification numbers.

Validation Workspace

Validate My Number

Enterprise checks for Japan tax identification numbers.

Instant one-by-one format validation

Country

Japan

Document

My Number format check

Enter a My Number to validate for Japan

Awaiting input

Paste values with or without separators. Validation also checks a normalized value.

Use a real My Number sample to verify format compliance before filing.

About Japan TIN (My Number)

The My Number (個人番号) is the official tax identification number used in Japan. Format: 12 digits with checksum

Valid Examples

  • 123456789012
  • 987654321098

Invalid Examples

  • 12345678901 (Too short)
  • 123456789013 (Invalid checksum)

Common Use Cases

  • Tax filing
  • Social security
  • Employment
  • Disaster relief

Official source: My Number Card Portal

Frequently Asked Questions

What is My Number?
My Number (個人番号 / Kojin Bangō) is Japan's social security and tax number system. It's a 12-digit ID assigned to all residents for administrative efficiency.
How is My Number validated?
My Number uses a checksum algorithm to validate the 12 digits. The last digit is calculated from the first 11 digits using a modulus-11 check.

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