For a TSA PreCheck enrollment appointment in 2026, the most critical item is proof of identity and U.S. citizenship. The "Gold Standard" is an unexpired U.S. Passport, as it serves as both. If you do not have a passport, you must bring two documents: a valid photo ID (like a driver's license) and a document proving citizenship (like an original or certified birth certificate or a naturalization certificate). Note that your driver's license must be "REAL ID" compliant in 2026 for it to be accepted as a primary ID at many centers. You will also need a payment method for the application fee (currently $78 for five years), which most centers accept via credit card, debit card, or money order (cash is usually not accepted). Finally, ensure the name on your documents exactly matches the name on your online application; if you have changed your name due to marriage or court order, you must also bring the legal name-change documentation to the appointment.