
Credit cards come with plenty of perks, making them a convenient tool for everyday spending. But what many people don’t realise is that they can quietly affect your borrowing power. Let’s start off by exploring the benefits of having a credit card, as well as some hidden drawbacks you should be aware of.

Lenders often consider your available credit when calculating how much you can borrow, because high credit limits can indicate potential future debt. When you apply for a loan, lenders look at how much credit you already have. Even if you haven’t spent it, they assume you could spend it in the future. To protect themselves, lenders often subtract a multiple of your credit limits from the amount they’re willing to lend you.
Your credit limit multiplied by five is a rough estimate of how much it could reduce your borrowing power or affordability when applying for a loan. This is also known as the 5× the credit limit.
If you have a $10,000 credit card, it could reduce your maximum home loan by about $50,000. How is that calculated? Multiply your credit limit by 5:
$10,000 × 5 = $50,000
So, if a lender originally thought you could borrow $500,000 for a home, your available credit of $10,000 might reduce that to around $450,000. Why? Because the lender assumes that in the future, you might use that credit, and it counts as potential debt.
It’s important to know that an unused card isn’t free in lenders’ eyes. A lender might treat your credit limit as if it’s debt, which can actually lower your borrowing capacity. If you don’t use your credit card daily, are looking to maximise your affordability, and want to remove “hidden debt”, it might be time to consider closing your credit card. Alternatively, you could decrease your credit card limit to help prevent extra interest and debt piling up in the future, saving you from reaching a point where it’s unmanageable.
Our friendly team of mortgage brokers are here to guide and support you, so you can make informed, confident decisions regarding your finances.
Let’s book a quick chat to see where you’re at today.