The term "TIN Number" stands for "Taxpayer Identification Number." In the field of human resources, a TIN Number is a unique identification number assigned to individuals and businesses by the tax authorities, primarily for tax reporting and documentation purposes.
Employers often require new employees to provide their TIN Numbers on tax forms such as the W-4 in the United States. These numbers are essential for accurately withholding and reporting income taxes to the government. Failure to provide a valid TIN Number can result in legal and financial consequences for both employees and employers.