Credit Card Limit Calculator

From Repayment Budget to Indicative Limit

This credit card limit calculator estimates the fully drawn limit your available monthly budget can repay over a chosen period. It first deducts household costs and existing commitments from take-home income, then keeps your chosen surplus buffer aside.

The monthly budget is income minus living costs, other debt repayments, the existing-card allowance and the buffer. A negative budget supports a $0 new limit. The proposed-limit comparison keeps that original deficit when showing the budget after repayment.

For a positive budget, the calculation uses the present value of equal monthly payments. The monthly rate, r, is the annual percentage rate divided by 1,200, and n is the number of months.

Indicative limit = monthly budget × (1 − (1 + r)−n) ÷ r

At 0% interest, the limit is the monthly budget multiplied by n. The proposed repayment reverses the same formula using your proposed limit. Both calculations assume a fully drawn balance, fixed interest and payments at each month end.

The model excludes card fees, further spending and changes in interest rates. Add any ongoing card fee to monthly costs before using the result. Convert an annual fee to a monthly amount by dividing it by 12.

Your figures stay in this page. The calculator does not upload them or save them between visits.

Salary, Expenses and Existing Commitments

Salary alone cannot establish an affordable credit card limit because tax and household spending reduce the money available for repayments. Enter monthly take-home income after tax and payroll deductions. This calculator does not estimate income tax from a gross salary.

Use income and costs for the same household. Count shared costs once, even when two people contribute income. Put continuing rent in living costs. Enter continuing mortgage and other loan repayments under other monthly debts so each cost is deducted once.

Existing card limits reduce the budget through an editable monthly allowance. At the starting 3% assumption, $5,000 of retained limits uses $150 a month. This percentage is a scenario assumption, not a universal issuer rule or the minimum payment on a card statement.

For a new facility, exclude its proposed limit from existing limits. For an increase to a retained card, treat the proposed limit as the whole replacement facility and exclude that card from existing limits. Keep all other retained limits in the existing-card field.

Compare Card Limit Scenarios

The hypothetical household example leaves $750 a month for a new card repayment. It starts with $6,500 take-home income, $3,800 living costs and $1,300 other debt repayments. The $150 existing-card allowance and $500 buffer account for the rest.

At 20% over 36 months, the indicative fully drawn limit is $20,181. A proposed $20,000 limit needs a modelled monthly repayment of $743.27. That fits the entered budget and leaves about $7 after the repayment, with the $500 buffer already set aside.

Each comparison changes one assumption. A longer horizon increases the modelled limit because repayment is spread over more months. It does not replace the three-year period used for Australian consumer credit-card assessments.

If the proposed limit rises to $25,000 while the example budget stays unchanged, its monthly repayment becomes $929.09. The tool flags that repayment as above the budget. Increasing the buffer or adding an ongoing commitment also reduces the limit the budget can support.

The 20% rate is an example, not a card offer. Moneysmart reports average credit-card interest above 18% in its guide to choosing a credit card. Enter the rate relevant to the facility being assessed.

Why an Issuer May Offer a Different Limit

An issuer determines eligibility and its offered limit after assessing the application, including verified income, expenses and credit history. Product minimums and maximums also constrain the available limit. This transparent budget calculation does not perform those checks or provide credit approval.

The Australian Securities and Investments Commission (ASIC) prescribes a three-year repayment-capacity period for new consumer credit-card contracts and limit increases. Changing the horizon here tests a scenario only. It does not change that assessment requirement.

ASIC's responsible lending guidance requires reasonable inquiries about financial circumstances and objectives, verification and an assessment of suitability. Issuers also account for fees and their assessment assumptions, so matching this example does not establish the limit they will approve.

For a mortgage scenario, carry the retained card limit into the borrowing power calculator and apply the mortgage lender's card-commitment treatment once. Use the card commitment there, not this tool's indicative card limit as a mortgage amount. Keep living costs separate from debt allowances to avoid counting the same commitment twice.