How is it possible that Simple Guaranteed doesn’t have a fee?

We take a small spread, which is the difference between the yield that we get from the bank and the one we deliver to you. This spread isn’t an additional fee to you, and you’ll still get the guaranteed rate. In other words, the rate you see is the rate you get.
This spread helps us stabilise the rate, which fluctuates, and cover the costs of bringing the product to you.