If you move out of your apartment and do not move into a new apartment in Germany (e.g. if you move abroad), you must deregister.
If you give up one of several apartments (secondary apartments), you must deregister the apartment you have given up. The registration office responsible for the abandoned apartment requires a completed and signed deregistration form, the identity card, the recognized and valid passport or the passport replacement document for your deregistration. If the registration register is kept automatically, you do not need to fill in the deregistration form if you appear in person at the registration office and confirm the correctness and completeness of the data collected by the registration office by signing a printout. Spouses, life partners and family members with the same previous and future residences can use one deregistration form; it is sufficient if one of the persons required to register signs the registration form.
Deregistration abroad can also be done in writing or electronically. In the case of electronic deregistration, proof of the identity of the person required to deregister can be provided by stating the surname, first name, date of birth and serial number of the last ID card or passport stored in the population register (Section 3 (1) No. 17 of the Federal Registration Act). Also inform the registration office of the address where you moved to and the country if you move abroad.
De-registration ex officio is possible and takes place if you have not fulfilled your obligation to de-register.
If you only have one apartment that you are giving up and are moving into another apartment in Germany, it is sufficient to register at the new place of residence. The registration office at the new place of residence will notify your former municipality that you have moved.
If you do not deregister within two weeks, you are acting irregularly. In this case, you can be fined up to €1,000.