Form fixture
- Input
- test form → required identifier field
- Expected output
- ITIN → plausible synthetic value
Use it when a form needs to accept ITIN without depending on real data.
ITIN validation rules
ITIN validation rules and limits
This page focuses on using synthetic ITIN in test scenarios. The goal is plausible data without touching real identifiers or implying official validation.
How to use synthetic ITIN safely
- The tool generates synthetic ITIN following 9 prefix with IRS-recognized ITIN groups. That is enough for masks, fixtures and contract tests that depend on plausible format.
- ITIN is tax-focused; the synthetic number does not authorize work, immigration, credit or general identification.
- Use it for tax-flow tests and international onboarding sandboxes without official lookup. Do not send the value to real verification, official registration, credit, employment, KYC or government services.
Useful test scenarios
Local rule test
- Input
- mask / prefix / check digit
- Expected output
- accepted locally → never treated as verified identity
The local rule covers 9 prefix with IRS-recognized ITIN groups; it does not cover official lookup or registry existence.
Full tool FAQ
No. ITIN is for federal tax purposes and does not replace SSN for benefits or work authorization.
Frequently asked questions
Is synthetic ITIN a real document?
No. It is a test value with plausible format or digits, without lookup in official databases.
What is the key limitation when using ITIN in tests?
ITIN is tax-focused; the synthetic number does not authorize work, immigration, credit or general identification.
How can privacy risk be reduced?
Generate the value in the browser, do not store it in URLs or logs, and ensure analytics receives only action metadata, never the identifier.