There's even more complexity, because:
- interest rates are so low, the interest doesn't come close to the Eigenmietwert in most cases (unless you earn a lot and have a lot more money than the 20% downpayment, so the bank could allow you to leverage to the theoretical maximum)
- money not paid for rent should be invested, as to be able to lower the mortgage when it runs out, in case the interest rates have increased to a level where paying them becomes a burden (which is not difficult, given an 80% financing in the above calculations)
- but because interest rates are more or less zero for most non-risky investments, that is easier said than done
- if your 2nd-pillar is under financed, one could pay additional money in there (which can be subtracted from the taxable income, to some point)
- or you could take money out of it (subject to tax) to lower the mortgage and then pay it back to lower taxes
- 3rd-pillar contributions should be max-ed out for you and your partner every year
- if you can't afford and max-out a 3rd-pillar for you and your partner, there's a problem somewhere in your calculation
Right now, from the calculator of ZKB, to get an 800000 mortgage you would need a yearly net income of 160k.
Not unreasonable, but also not too representative of even the EF-population (myself included - I don't make 160k net, thank you)
If you have a partner and two or three kids, your (or your partner) probably can't have a job that pays 40k net part-time. At least, it's realistic to assume that.
So, who ever earns most continues to work and the other stays at home.
All these back-of-the-envelope (if you smoke, you should give up that, too - saves tens of thousands over a decade) calculations also assume you never lose your job, never total your car in way that your insurance doesn't pay.
In fact, you should create a fund specifically for financing your current and your next car so that you don't have to take out a loan next time you need to buy a new one.
It would be reasonable to create a slightly higher house-maintenance fund because you have to finance all the repairs yourself (washing-machine, dish-washer, kitchen, the dreaded roof, painting, cleaning the ventilation-system (if the house is minergie), lawn-mower etc.pp.)
AFAIK, deprecation of flats is actually worse than that of a house.
Should be taken into consideration when a potential resale-value is calculated.
But mortgage rates are at an absolute, historical low. So whatever you pay in interest usually doesn't come close to rent (unless you currently live in a flat-share or your mothers basement...).
So, it might still make sense to buy, if the price isn't unreasonable.
Usually, your bank should be able to tell you if the valuation for the house of the seller is actually realistic.
And maybe somebody who paid vermoegenszentrum.ch can tell if their advice is worth the money. I'm thinking of enlisting their help, if I ever get to buy something.
As for not paying off mortgages: I think that wasn't a bad idea per-se, historically, when you could actually get a decent return on your savings without significant risk.
Also, if you had bought at the right time and emptied your 2nd-pillar for it, valuation-increase, income-increase and appreciation made owning a house and selling it after 20-ish years a very good investment.
As of now, my perception is that it's currently not realistic to assume a repeat of that scenario in 10 to 20 years and take it as a "given" when doing your financing calculations....