Canceling a Deutsche Bahn "BahnCard" is relatively straightforward, but it requires adhering to strict notice periods to avoid an automatic one-year renewal. Most BahnCards (such as the BahnCard 25 or 50) are subscriptions that renew annually unless canceled at least four weeks (for some cards) or six weeks (for others) before the end of their validity period. The easiest way to cancel is through your "Meine Bahn" customer account on the official Deutsche Bahn website or the DB Navigator app. Once logged in, you navigate to the "BahnCard" section, select "Options," and look for the "Cancel BahnCard" button. If the button is not visible, it usually means the deadline has already passed. You can also submit a cancellation via a contact form or by post, but the digital method provides immediate confirmation. It is vital to keep this confirmation as proof, as the system is automated and will charge your linked payment method for the following year if the cancellation isn't processed in time.