The Real Cost of Credit Cards on Your Mortgage Capacity

Yes, banks assess your total credit limit rather than your actual balance when calculating your borrowing capacity. A $10,000 card with zero balance is treated as if you could max it out tomorrow, reducing your borrowing power significantly. This is because lenders must account for the potential liability you could incur at any time.

Banks typically apply a 3-5% repayment rate to your total credit card limit when assessing your borrowing capacity. This means a $10,000 card could reduce your mortgage eligibility as if you were paying $300-$500 monthly in debt repayments, potentially reducing your maximum loan by over $65,000. The impact affects your [debt-to-income ratio](/blog/debt-to-income-ratios-what-are-they-and-how-are-they-measured) even if you never carry a balance.

Consolidation can save money if managed carefully, particularly if you are paying 20% interest on credit cards versus 7% on a mortgage. However, spreading short-term debt over a 25-30 year mortgage term means paying significantly more interest overall. Consider a structured repayment plan where consolidated debt is paid off faster than the full mortgage term.

Before applying, consider reducing your credit limits to only what you realistically need, paying more than the minimum payment to demonstrate responsibility, and clearing balances before due dates to avoid interest charges. Close unused cards and monitor your credit report for errors. These steps can significantly improve your position when seeking [mortgage approval](/blog/when-is-the-right-time-to-refinance-your-mortgage).

While BNPL is not assessed in quite the same way as credit cards, it is still a form of debt that lenders consider. Regular payments to providers like Afterpay or Zip show up in your bank statements and reduce your available income for mortgage repayments. Clearing BNPL balances before applying can improve your borrowing capacity.

If you owe $1,000 on a card with a $10,000 limit, your minimum payment might be $50 per month. However, for mortgage assessment purposes, banks will calculate based on the full $10,000 limit at 3-5%, treating it as a $300-$500 monthly commitment. This significant difference often surprises first home buyers and those [refinancing](/blog/when-is-the-right-time-to-refinance-your-mortgage).

You can still use credit cards for rewards, but managing them strategically is essential before a mortgage application. Keep limits as low as possible while still earning rewards, pay off balances in full each month, and consider reducing limits temporarily during the application period. The key is minimising your total available credit while maintaining a good payment history.