Do banks use the credit card limit or the balance?

Banks often focus on the credit limit because they assess the risk that the full facility could be used, not just the balance you happen to carry today.

Can lowering card limits improve mortgage borrowing power?

Yes, in many cases reducing or closing unused credit facilities lowers the servicing assumption a lender applies and can improve borrowing capacity.

Should unused credit cards be closed before a mortgage application?

Usually yes if they are not needed. Unused cards can still count against you, so cleaning them up early is often a smart pre-application step.

Credit Card Impact Calculator

See how your credit card limits affect your mortgage borrowing power

Important: Banks assess your credit card limit, not your current balance. Even if you pay off your card each month, the full limit reduces your borrowing capacity.

Credit Limit Per Card

Number of Credit Cards

Current Balance (for reference)

Note: Banks use the limit, not the balance

Annual Income

Bank Test Rate (%)

Banks typically test at 7-8%

Borrowing Power Reduction

$85,811

Based on $20,000 total credit limit

Potential Gain if Limits Reduced

$77,230

By reducing limits to $2,000 total

Assumed Monthly Payment

$600

3% of total limit

Total Credit Available

$20,000

Quick Actions to Improve Borrowing

• Request credit limit reductions on all cards
• Cancel unused credit cards
• Pay off and close store cards
• Avoid Buy Now Pay Later services

How Banks Calculate Credit Card Impact

Banks assume you could max out your credit cards at any time. They calculate a hypothetical repayment (typically 3-5% of the limit) and subtract this from your available income for mortgage servicing.

Example: A $20,000 credit limit = $600/month assumed payment = approximately $$85,811 less you can borrow on a mortgage.

Why limits matter more than balances

Lenders usually assess the risk that the full credit limit could be used, not just the amount currently owing. That is why an almost-empty card can still reduce borrowing power more than people expect.

Multiple cards compound the effect, even if each balance is low.
Store cards and buy-now-pay-later accounts can also reduce capacity.
Unused cards are often worth closing if they are not serving a real purpose.

How to improve borrowing power quickly

Reducing card limits is often one of the fastest pre-application fixes. It does not guarantee approval, but it can remove a surprisingly large servicing drag.

Lower limits before applying rather than after pre-approval starts.
Close unused cards completely if they are not needed.
Keep evidence of the reduced limit or closed facility for the lender if requested.

Credit card impact FAQs

Do banks care more about the limit or the balance?

In most cases the limit matters more, because lenders test what repayment could be required if the facility were fully used.

Will lowering my card limit improve borrowing power?

Often yes. Lowering or removing unused credit can reduce the monthly servicing assumption the bank applies, which can improve borrowing capacity.

Should I close unused cards before applying for a mortgage?

Usually that is sensible if you do not need them. Unused credit lines can still count against you, so cleaning them up early can strengthen the application.

Disclaimer: This calculator provides estimates only and should not be relied upon for financial decisions. Actual loan terms, rates, and eligibility may vary. Please contact a Mortgage Lab adviser for personalised advice.