Beware: existing customers always pay higher interest rates

Banks will usually offer higher interest rate discounts to new customers to win their business. But, of course, the banks never offer these higher discounts to existing customers, unless they ask for them.  

Whilst this has always been the case, it is noteworthy that interest rate discounts have increased substantially over the past 10 years. This means the gap between what interest rates existing and new customers are being charged has also widened to the extent that it is becoming more important that you (or your mortgage broker) review your loans at least annually.  

New customers are enjoying higher discounts

A decade ago, interest rate discounts (i.e., discount off the standard variable rate) typically ranged between 0.70% and 0.90% p.a. Today, we are obtaining discounts of up to 2.95% p.a.[1]! This means it’s very likely that new customers are paying significantly lower interest rates than existing ones, particularly if they haven’t renegotiated their loans for a few years.   

The chart below is compiled by the RBA and illustrates that new customers (orange line) are, on average, being charged lower variable interest rates than existing customers (purple line) – see yellow highlighted box. As you can see, this gap has widened considerably over recent years.  

 CHART 

What drives home loan discounts? 

Management remuneration packages (i.e., senior banking executives) tend to be linked to shareholder returns i.e., the share price. Bank share prices will be affected by factors such as (1) growth in mortgages compared to their peers and (2) net interest rate margin (which essentially is the gross profit generated by mortgage lending). A positive or negative change in these factors will tend to have an influence on a banks’ share price.  

For a variety of reasons, banks can experience phases where they produce better results (i.e., high growth and margins) than their peers. Conversely, the reverse is true too. Therefore, when a bank underperforms, it must make up for lost growth and buy a greater share of the (mortgage) market. It does this through discounting, either through broad based promotions or more often, offering higher customer-specific discounts to win new business.  

For example, in its recent half-yearly presentation in May 2022, Westpac confirmed that its investment mortgage loan book experienced a decline of 6.6% since Se

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