There could be many reasons for it. I assume that the biggest one is the flexibility offered in home loans here (you can pay it off early, also lots are access bonds) and that makes it very hard for the banks to hedge their interest rate risk on fixed rate loans without potentially massive penalties for early settlement.
I hear you and you're correct. Funny thing is that banks actually don't take that much risk when lending money, because the money they lend out is created out of nothing. This is allowed because of the fractional reserve system.
This is how it works:
- You (I'll call you Jeho

) deposit R1 000 000 into Absa,
- Absa reserves R100 000 (let's assume they're allowed to reserve 10%), and lends out R900 000.
- You still see R1 000 000 whenever you check your balance at your ATM or internet banking app, thing is that R900 000 is created out of nowhere in what they call bank credit. So in other words, R900 000 is created out of nothing.
- So there was R1 000 000 in the system before you deposited money into the bank, now there is R1 900 000, R900 000 of which was created out of nothing (bank credit).
- Absa lends R900 000 to Sly to buy a Range Rover. Sly buys from Elon Musk (I'm sure there are a lot of people named Elon Musk in SA

). Elon in turn deposits that R900 000 into FNB.
- FNB has R900 000 in their system. They reserve 10%, i.e. R90 000. They lend out R810 000.
- Elon still sees R900 000 in his bank balance. That's because R810 000 is created out of nothing, or in other words, R810 000 is created so that Elon doesn't think that the bank has lent out his money to other people, or for whatever reason.
- So in two transactions, we have R900 000 and R810 000 created out of nothing. And the bank gets to charge interest on that money. In other words, the bank gets to charge interest on R1 710 000 (R900 000 + R810 000.
- We can carry on.
- FNB lends out R810 000 to Zuma to pay back the money for unnecessary upgrades to his Nkandla house. Zuma instead plans to buy a watch worth the same amount, and deposits that money with VBS mutual bank.
- VBS lends out R729 000 to Malema to pay SARS. Zuma still sees R810 000 in his bank balance. That's because R729 000 is created out of nothing.
- VBS reserved R81 000, lent out R729 000 and also created R729 000.
- Now there is R900 000 + R810 000 + R729 000 = R2 439 000 created out of nothing, but banks will charge interest for that money.
- This can go on and on until technically a total of R9 000 000 is created in the banking system out of nothing, and banks charge interest on that.
The above is how the fractional reserve system works. Hence why I say banks don't actually take risk on their loans.