Valid and invalid TIN matching characters

When performing TIN (Taxpayer Identification Number) matching with the IRS or other authorized systems, it’s critical to use the proper format and valid characters. Submitting an invalid TIN can cause errors, delays, or rejections.

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Valid TIN Formats

Social Security Numbers (SSNs):

• Format: XXX-XX-XXXX or just 9 digits with no dashes.

• Example: 123-45-6789 or 123456789.

Employer Identification Numbers (EINs):

• Format: XX-XXXXXXX (2 digits, a dash, and 7 digits).

• Example: 12-3456789.

Individual Taxpayer Identification Numbers (ITINs):

• Format: 9XX-XX-XXXX (always begins with a 9).

• Example: 912-34-5678.

• ITINs must fall within ranges such as:

  • 900-70-0000 through 999-88-9999

  • 900-90-0000 through 999-92-9999

  • 900-94-0000 through 999-99-9999

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Valid Characters

• Digits 0–9 (all TINs must be numeric).

• Hyphen (-) as a separator (e.g., 123-45-6789).

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Invalid TIN Characters

• Letters: Alphabetic characters are not allowed.

• Special symbols: ! @ # $ % ^ & * ( ) + = < > [ ] { } / " and similar are invalid.

• Spaces: No leading, trailing, or embedded spaces.

• Incorrect length:

  • SSNs must have exactly 9 digits.

  • EINs must have exactly 9 digits with a dash after the first two.

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Unacceptable Patterns

• SSNs or ITINs cannot contain 000, 666, or 900-00-0000.

• EINs cannot begin with 00.

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Common Errors to Avoid

• Mixing SSN and EIN formats.

• Placing dashes in the wrong positions.

• Using placeholders such as 999999999.

• Submitting masked or truncated TINs (e.g., ***-**-6789).

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How 1099FIRE Can Help

At 1099FIRE, we provide bulk TIN matching services to reduce IRS rejections and penalty notices. Our system checks name/TIN combinations against IRS records before filing, helping you:

• Detect invalid TIN formats.

• Prevent errors that trigger CP2100 notices.

• Stay compliant with IRS reporting requirements.

For expert TIN matching support, contact us at support@1099fire.com or call (480) 706-6474.