well, I wouldn’t compare the USA with Germany...
1) in the USA they have variable financing, they don’t know anything like fixed interest rates, i.e. if today the interest rate is 1% and you can pay the installment well, a few months later at 2% interest it may no longer be affordable for some, and then a domino effect can occur...
2) in the USA they financed not only the house + additional costs + new kitchen, often also the new car, or even two (the wife wants one too ),
and then that combined with point 1 = a toxic cocktail!
in Germany it looks different
1) fixed interest rate, nowadays rather 15-20 years = constant installment
2) often after the fixed interest period ends half or more is already paid off.
Since the introduction of the WIKR (Wohnimmobilienkreditrichtlinien!) in 2016 the situation has even worsened, because besides the long fixed interest period there are further bank checks such as:
- after the fixed interest period expires, the remaining sum is checked, or whether the customer can afford 6-8% (annuity), if this goes negative = rejection
- if the credit term (not the fixed interest period) runs into retirement age (example: at 2% repayment = 35 years term, customer retires in 30 years), the bank must also check based on retirement info whether the customer can still afford the installment in retirement, if not = rejection
Income:
well, if you are single and in Germany the top tax rate applies at 60,000 EUR gross... then not much of the gross amount is left
(at 100k = 4200 a month = half gone for taxes and charges...)
in metropolitan areas you are basically forced to be double income earners to afford something decent, or you just inherit ))