I have -0.28% on a mortgage which will be refinanced every 5 year. The lenders actually pay me to store their capital. Weird times. In actuality, though, I als

I have -0.28% on a mortgage which will be refinanced every 5 year. The lenders actually pay me to store their capital. Weird times. In actuality, though, I also pay a 0.5% "contribution" fee which covers mortgage company administration and collective risk. So the effective rate is around 0.22%. For the 20y bonds the 0% interest is also just the actual bond rate. The administration fee will have to be added. The "contribution" fee rate depends on how much of the home value has been mortgaged. Below 60% it is typically around 0.5% because of the relatively low risk (you can probably always auction off the house at get at least 60% even in bad times). When mortgaged from 60 to 80% of the home value the fee is higher.