To cancel a Deutsche Bahn BahnCard, you must adhere to a strict notice period, typically at least six weeks before the card's expiration date. If you miss this window, the subscription will automatically renew for another year. The most reliable "high-fidelity" way to cancel is through the official DB website or the Bahn.de customer portal. After logging into your "My Bahn" account, navigate to the "BahnCard" section and look for the "Cancellation" or "Contact Form." Alternatively, you can send a written cancellation via email to [email protected] or via physical mail to the BahnCard Service center in Frankfurt. Always request a written confirmation of the cancellation to ensure you aren't charged for the following year. If you have just purchased a card and changed your mind, there is usually a 14-day "right of withdrawal" for online purchases. For 2026 travelers, keeping track of this deadline is crucial to avoid unwanted recurring charges, as DB is very firm about their automated renewal policies for the BahnCard 25 and 50.