I am a Dutch citizen moving from the United Kingdom to Germany. I have received a conditional employment offer. My next employer has asked me to submit my Lohnsteuerklasse und Steuer-Identifikationsnummer (salary tax classification and tax identification number) at least one month prior to my start of employment. I understand that I can obtain those from Finanzamt (finance office), but apparently only after I have registered with the Meldebehörde (registration authority), for which I apparently need a Wohnungsgeberbestätigung. Is there any way I can get obtain the Lohnsteuerklasse und Steuer-Identifikationsnummer (at least) a month before my start of employment, without physically moving a month before I am due to start (which might mean being unemployed for a month)?
I suppose I would need to rent a place to get a Wohnungsgeberbestätigung, but signing a lease in order to register more than a month before I move without actually moving would be costly (double rent), and I fear it may be considered fraudulent, too. Similarly fraudulent may be to temporarily register at my wifes Zweitwohnung (secondary residence) without ever planning to live there (and the landlord may be unwilling to provide a Wohnungsgeberbestätigung for two for an apartment so small it is only fit for one). Is there another way out of this catch?