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Japan TIN validator
Check whether a Japan My Number follows the expected structure before you save it, send it to an API, or include it in a tax workflow.
Private by design
Your data stays in your browser
None of the TIN data you enter is ever saved to our servers — validation runs entirely on your device.
Validation Workspace
Validate My Number
Enterprise checks for Japan tax identification numbers.
Instant one-by-one format validation
How Japan tax IDs are formatted
In Japan, the tax identifier is commonly known as My Number (個人番号) (My Number). The expected format is 12 digits with checksum. Teams usually need a Japan My Number check around tax filing, social security, employment, or before a record moves into billing, onboarding, or compliance review.
Valid examples
123456789012987654321098
Invalid examples
- 12345678901 (Too short)
- 123456789013 (Invalid checksum)
What this validator checks
Format and length
Confirms the number follows the expected Japan pattern: 12 digits with checksum.
Checksum logic
Runs the checksum rule used by Japan when the public format includes one, helping catch typos that still look correctly formatted.
Useful examples
Shows valid and invalid-looking samples so you can compare spacing, separators, letters, and digit counts before submitting real data.
When people usually check this number
- Tax filing
- Social security
- Employment
- Disaster relief
A format match does not prove that a Japan tax ID belongs to a specific person or business. Use the result as a first-pass data quality check, then confirm sensitive cases with official records.
Official source: My Number Card Portal
Last reviewed: May 23, 2026. We update country guidance when public format rules change.
How to check a Japan My Number
Use this check before a record reaches billing, tax reporting, or manual review.
Enter the My Number
Paste or type the Japan tax identifier exactly as it appears in your source record. Spaces and separators are fine when they are part of the expected format.
Review the format result
Check whether the number matches the known Japan structure, including length, separators, letters, and checksum rules where public guidance includes them.
Confirm important records
For onboarding, tax reporting, or compliance work, treat the result as a data-quality signal and confirm high-risk records with My Number Card Portal or your internal process.
Frequently asked questions
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