Description
An ITIN (Individual Taxpayer Identification Number) is a tax processing number issued by the IRS to individuals who are not eligible for a Social Security Number. ITINs are considered sensitive personally identifiable information (PII) and must be protected to prevent misuse such as identity theft or tax fraud.
An ITIN follows a specific format: it always starts with the number 9 and uses specific values for the fourth and fifth digits (e.g., 70–88, 90–92, or 94–99). Example: 912-70-1234.
Only authorized systems should store ITINs, and they should never appear in plain text in logs, emails, or unencrypted files.
Resources and Additional Information
IMAGE
UNDERSTANDING ITIN
Detection Steps
An ITIN is a 9-digit number formatted as 9XX-XX-XXXX and uses valid ranges in the middle two digits. The general detection format is:
9\d{2}-(7[0-9]|8[0-8]|9[0-2]|9[4-9])-\d{4}
Keywords such as ITIN, taxpayer ID, individual taxpayer, and IRS number may also help identify relevant content.
Description
An ITIN (Individual Taxpayer Identification Number) is a tax processing number issued by the IRS to individuals who are not eligible for a Social Security Number. ITINs are considered sensitive personally identifiable information (PII) and must be protected to prevent misuse such as identity theft or tax fraud.
An ITIN follows a specific format: it always starts with the number 9 and uses specific values for the fourth and fifth digits (e.g., 70–88, 90–92, or 94–99). Example: 912-70-1234.
Only authorized systems should store ITINs, and they should never appear in plain text in logs, emails, or unencrypted files.
Resources and Additional Information
IMAGE
UNDERSTANDING ITIN
Detection Steps
An ITIN is a 9-digit number formatted as 9XX-XX-XXXX and uses valid ranges in the middle two digits. The general detection format is:
9\d{2}-(7[0-9]|8[0-8]|9[0-2]|9[4-9])-\d{4}
Keywords such as ITIN, taxpayer ID, individual taxpayer, and IRS number may also help identify relevant content.