Credit Card Debt and Home Loans — How It Affects Your Borrowing Capacity (Australia 2026)
Credit cards have a larger impact on your home loan borrowing capacity than many Australians realise. It is not just about the balance you owe — it is about the credit limit you hold. Here is how lenders treat credit cards when assessing home loan applications.
The Key Insight: Lenders Assess Your Limit, Not Just Your Balance
When calculating your borrowing capacity, Australian home loan lenders treat your full credit card limit as an outstanding debt obligation — regardless of how much you currently owe on the card.
Why? Because the day after you settle on your home loan, you could theoretically max out every credit card. Lenders account for this potential liability.
Example:
- You have a $20,000 credit card limit
- You currently owe $0 on the card
- The lender still assumes an annual repayment obligation of approximately $600/month (at a notional minimum repayment rate)
- This reduces your home loan borrowing capacity by approximately $100,000
This is one of the most significant and least understood factors affecting borrowing power.
How Lenders Calculate Credit Card Obligations
Each lender has their own method, but a common approach:
$$\text{Assessed monthly obligation} = \text{Credit limit} \times \text{Assessment rate} \div 12$$
Where the assessment rate is typically 2.5–3% per month of the limit, or an annualised factor.
Example (CommBank, ANZ — indicative):
- Card limit: $15,000
- Monthly obligation assessed: ~$375/month
- Impact on borrowing capacity: Can reduce it by $70,000–$100,000 (at current rates)
Multiple Credit Cards Compound the Effect
| Card | Limit | Monthly obligation (indicative) |
|---|---|---|
| Card 1 | $10,000 | ~$250/month |
| Card 2 | $15,000 | ~$375/month |
| Card 3 | $5,000 | ~$125/month |
| Total | $30,000 | ~$750/month |
At $750/month in assessed card obligations, borrowing capacity may be reduced by $140,000–$200,000 compared to having no credit cards.
Before Applying: Reduce or Cancel Cards
The most effective way to increase borrowing capacity through credit cards:
- Cancel credit cards you don’t need — this removes the limit from your file
- Reduce limits on cards you keep — a $20,000 limit reduced to $5,000 significantly reduces the assessed obligation
- Pay off any outstanding balances — while the balance has less impact than the limit, zero balance is still better than an outstanding balance
Allow 2–4 weeks for limit reductions and closures to be reflected in your credit file before submitting a home loan application.
Does Having No Credit Cards Help?
Having no credit cards removes the limit obligation entirely — which maximises borrowing capacity from a credit card perspective. However:
- Having no credit history at all (no credit cards, loans, etc.) may mean a thin credit file
- Lenders may also want to see evidence of financial responsibility through credit history
- The majority of borrowing capacity impact comes from limits, not the absence vs presence of cards
For maximum borrowing capacity: keep one low-limit card ($1,000–$3,000) with a clean payment record, and cancel the rest.
Outstanding Balances vs Limits
Both matter — but limits are typically assessed more heavily:
| Factor | Lender treatment |
|---|---|
| Credit card limit | Assessed as a full debt obligation (even if $0 balance) |
| Outstanding credit card balance | Treated as a debt and included in expense assessment |
| Credit card repayments (CCR) | Visible repayment history; affects credit score |
| Credit card utilisation | High utilisation (>30%) negatively affects credit score |
BNPL Accounts — Similar Effect
Buy-now-pay-later accounts (Afterpay, Zip, Humm, etc.) are assessed similarly to credit cards by some lenders. The outstanding balance and repayment obligations are included in expense assessments. Some lenders treat BNPL accounts as signals of financial stress.
Before applying for a home loan:
- Consider closing unused BNPL accounts
- Ensure all BNPL accounts are paid up to date
Frequently Asked Questions
Should I close all my credit cards before applying for a home loan?
Closing all cards removes the limit obligations and maximises borrowing capacity. However, it also removes positive CCR data. A common middle ground: keep one low-limit card ($1,000–$3,000), reduce other limits significantly, and cancel cards you rarely use.
How long before a home loan application should I close cards?
Allow at least 4–6 weeks for credit bureau updates. Some lenders check real-time credit enquiry systems that may show more recent data.
Does having a credit card with zero balance hurt my score?
Generally no — a card with a zero balance and a clean payment history is neutral to positive for your score. The main negative from credit cards (beyond defaults) is high utilisation (spending close to your limit) or missed payments.
What if I need a credit card for work expenses?
If you must have a card for work purposes and your employer reimburses expenses, try to maintain a low limit and document the business use. Some lenders will consider the reimbursement context.
Related Guides
- How to Improve Your Credit Score Before Applying
- What Banks Look at When Assessing a Home Loan
- How Much Can I Borrow?
- How Your Credit Score Affects Your Mortgage Rate
- Credit and Home Loans Hub
This article provides general information about how credit cards affect home loan borrowing capacity in Australia. Lender assessment methods vary. For advice tailored to your situation, speak with a licensed mortgage broker who can model the impact of your current credit facilities. Find one through MoneySmart.