Your notice period is stated in your lease agreement. If your notice period is 3 months, for example, you should be aware that you have the current month + the 3 months. The property must therefore be terminated no later than the last day of the month so that it is received before the 1st of the month - i.e. before the 3-month notice period has begun.
To avoid any problems with receiving and completing the termination form, we recommend submitting the notice as early as possible.