How credit card limits affect borrowing power
A credit card can affect borrowing power even when its balance is zero because a lender may assess the commitment attached to the available limit. Paying off a card and reducing its limit are different actions. The effect on your home loan depends on the lender’s assessment and your other finances; there is no universal dollar-for-dollar or fixed-multiple increase in borrowing power when a limit is reduced.
By Ratey · General information for Australian borrowers.
Worked example: the useful comparison has no invented multiplier
Alex has one card with a $12,000 limit and a $400 balance, plus another with an $8,000 limit and no balance. The combined limits are $20,000; total current debt is $400. Paying the $400 clears the balance but leaves the $20,000 of limits unchanged.
Alex asks the lender to compare retaining both cards with keeping only a $5,000 limit on the first card. The proposed limit reduction is $15,000. This example deliberately leaves the borrowing-power change for the lender to calculate because its assessment requires the rest of Alex’s finances.
Before making a change, Alex checks recurring bills, asks how closure will be confirmed and considers whether $5,000 fits actual card use. The written comparison becomes the basis for the decision.
Record both the limit and the balance
The balance is what you currently owe. The limit is the amount available under the facility. If a card has a $15,000 limit and a zero balance, those numbers should appear separately in your application notes. Entering zero in a field that asks for the limit produces a misleading scenario.
APRA’s guidance describes assessing revolving credit commitments with reference to committed limits. Ask the proposed lender how it treats your actual facilities rather than applying a rule of thumb from somebody else’s approval.
Make one list before changing anything
List each account, its provider, limit, outstanding balance and whether you plan to retain it. Include a card that you rarely use or keep only for travel. For a jointly held account or additional card, check the underlying credit facility so you do not accidentally omit a liability or count the same limit twice.
Add a column for practical dependencies: subscriptions, insurance, recurring bills, points, refunds and any pending transactions. This turns a borrowing discussion into a manageable plan. A reduction that appears simple on paper may still require you to move payments or clear an outstanding amount first.
| Item to record | Why it matters |
|---|---|
| Current limit | Identifies the available facility being assessed |
| Current balance | Shows debt that still needs repayment |
| Proposed limit | Makes the comparison specific |
| Provider confirmation | Documents that a requested change actually occurred |
Ask for a comparison with the same inputs
Ask the lender or broker to compare the current limits with a proposed lower limit while holding other application details constant. Request the resulting loan amount, repayment and any conditions. This isolates the question you are trying to answer.
If the result changes, check whether an income update, different term or new expense assumption also changed. A different borrowing estimate does not prove the whole change came from the card. Avoid multiplying a $10,000 limit reduction by a number found online and adding that result to your budget.
Keep the household decision in view. A larger approved loan also means a larger debt. Decide what you can comfortably repay and what accessible cash you need, rather than adjusting every facility solely to maximise the application amount.
A request to close a card is not closure evidence
Ask the provider what happens to pending transactions, refunds, fees and recurring charges before closing an account. Keep the confirmation of the new limit or account closure. Then ask the mortgage lender which evidence it needs and when it needs it.
Give the lender accurate details throughout the application. Do not assume it will know about a recent change immediately, and do not leave out an active facility because you intend to close it later. If your plan changes before settlement, tell the lender so it can reassess the application details.
Your next-step checklist
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Common questions
Does paying the card in full each month remove its impact?
A zero balance does not remove the available limit. Ask how the lender assesses that facility in your application.
Should I close every credit card?
That is not an automatic requirement. Compare the lending effect with your actual card use and payment arrangements before deciding.
Can Ratey calculate the exact borrowing increase?
The public equity and mortgage-stress tools do not reproduce a lender’s serviceability assessment. They cannot calculate a reliable approval change from a card-limit reduction alone.
Sources and assumptions
These primary sources support the explanations above. Examples use invented figures to show the calculation or decision; they are not available loan offers. Check your lender’s terms for your circumstances.
Calculations are estimates and do not establish borrowing eligibility. Read the calculation methodology.
Separate the equity question
Check what your property figures show before discussing the repayment assessment.