It Does What It Says on the Tin Photo Courtesy: mediaphotos/Getty Images Each twelvemonth, tens of millions of people in the United states of america file tax returns. With so many people to keep track of — many of them with like names, birthdates and addresses — it could exist pretty difficult for the IRS to continue upwards with who's who and ensure the correct payments are allocated to the right people'due south records. That's why the IRS uses something a bit more specific than names and birthdates to keep up with taxpayers' filings: a taxpayer identification number (Tin can). Every taxpayer has a unique Tin can. In that location are also multiple types of TINs that the IRS and other entities have equally identification. One person may have more than than one type of TIN, but multiple people never share a TIN. Y'all'll need to know your TIN when yous f