Your Borrowing Power takes into account information that would have been excluded from your credit score but that forms part of the criteria for a particular credit product.
It is calculated against a wide range of products, including purchase, balance transfer and rewards credit cards from providers across the lending spectrum. Each product is likely to have different criteria that could include salary, current products (whether you already have a product with this lender) and age.
If you are interested in finding out more about your Borrowing Power we also have a video summary available that can help to explain: