Tax Info Center
IRS API
Test Submission
XML Parser
Manage Schema
PDF ID Generator
Form PDF
TIN Matching
AI Prompt
Version 1.1.0
Step 1 — Authentication
Client ID
User ID (e-Services username)
Key ID (KID)
Environment
Production (api.www4.irs.gov)
AATS / Test (api.alt.www4.irs.gov)
Get Access Token
Token Result
Client JWT — header / payload
User JWT — header / payload
Raw Response
Step 2 — TIN Match Request
TIN Type
EIN
SSN
ITIN
UNKNOWN
TIN (9 digits, no dashes)
Taxpayer Name
Submit TIN Match
TIN Match Result
Request Sent
Raw Response
Diagnostic Log
Clear
Tax Info Center
Test Submission
XML Parser
Manage Schema
PDF ID Generator
Form PDF
TIN Matching
AI Prompt