Differences between your own calculation and our calculation can be due to rounding differences and/or be caused by the use of the nominal interest rate by the Cashare-system for calculating the monthly rate. The nominal interest rate is derived from the displayed effective interest rate. The display of the effective interest rate is a requirement of the law on consumer credit. The calculation of the monthly rates with nominal interest rate is custom to the Swiss market and, to our knowledge, is used by all lending agencies in Switzerland.
Conversion formula: inom = 12*(1+ieff)^(1/12)-1
You can find a calculator for nominal and effective interest rate on this website: https://www.calculatorsoup.com/calculators/financial/nominal-interest-rate-calculator.php
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