What is this "Kraftfahrzeugsteuerbescheid" letter I just received?

What is this "Kraftfahrzeugsteuerbescheid" letter I just received?

Have you received a letter from Frankfurt am Oder asking you to send money somewhere? Do not panic, here's what it's all about.

If you purchased a vehicle in Berlin recently, you will receive a letter from the Hauptzollamt Frankfurt am Oder asking you to send them money. Do not panic! This is the vehicle tax all Germans have to pay. The letter comes from Frankfurt am Oder because the Berlin tax office has closed in 20141.