Affordability is crucial
Affordability is the decisive criterion for granting or renewing a mortgage. It exists when the total costs for the house or apartment (mortgage interest, amortization and maintenance and additional costs) do not account for more than a third of the total income.
The calculation is not based on the real interest rate, but on the fictitious, higher imputed interest rate of around 5 percent. This buffer is intended to ensure that you as a borrower can service the mortgage even if interest rates rise. This affordability calculation also applies to mortgage customers of reference age.