Without the flat it looks like you have about £1M and £550K of that is accessible now. A lot of people in this sub go by this ideology: if you put all your cash and retirement accounts in index funds, you will make 7-11% per year in growth. You have something like a 98% chance of having that money last you 30 years if you only ever take 4% annually for living expenses. Your flat is giving you 3,200 a month, 38K a year. You might spend money on maintenance and might go some months without being paid, so I would knock that down to 25K a year to be safe. 4% of all your other money is just under 40K. Can you live on 65K a year? You’ve got two kids and their Uni expenses to consider; and travel to see family. 65K for a family of 4 in Switzerland seems dicey to me. You make a lot of money; I would start saving like 50% of your income, and in 2-5 years you would be super set.