How does a bank assess creditworthiness without German credit history?
Through substitute evidence — and that is what decides whether a third-country file works. Anyone who has lived in the United States, the United Kingdom or Asia for years has no current German credit history, so a standard bank's scoring simply finds nothing.
Lenders who handle these cases work instead with several months of account statements, foreign tax assessments and an employer confirmation, usually in English. Two further points need settling before credit standing is even reached: which law governs the loan contract, and how identification works without the domestic PostIdent procedure.
That is why fewer banks underwrite third-country constellations — not because of distance, but because of the chain of evidence. They are regularly workable; they need preparation rather than renegotiation. Gathering the evidence before the first appointment is what shortens the process, not arguing about the rate afterwards.