Borrowing Capacity Calculator – How Much Can You Borrow for a Home Loan?

Borrowing Capacity Calculator

Most Australian lenders allow borrowers to service a mortgage where repayments are typically 30–40% of their gross income, after living expenses and existing debts are considered.

However, banks assess borrowing capacity using several factors including:

• income
• living expenses
• existing debts
• number of dependants
• credit limits
• interest rate buffers

The borrowing capacity calculator below provides an estimate of how much you may be able to borrow based on your financial situation.

Actual borrowing limits vary between lenders, which is why a personalised borrowing assessment can produce different results.

Borrowing Capacity Example

Here is a simple example of how borrowing power may be calculated.

What Is Borrowing Capacity?

Borrowing capacity (also called borrowing power) is the maximum amount a lender may be willing to lend you for a home loan based on your financial situation.

Lenders calculate this by assessing whether your income is sufficient to cover your living expenses, existing debts, and the proposed home loan repayments.

In simple terms, the calculation looks like this:

Income – expenses – existing commitments = borrowing capacity

The higher your surplus income, the more you may be able to borrow.

What Factors Affect How Much You Can Borrow?

Several financial factors influence borrowing capacity. Two people earning the same salary may have very different borrowing limits.

Income

Lenders start with your income sources, which may include:

If you apply with a partner, the lender may include both incomes in the assessment.

If you apply with a partner, the lender may include both incomes in the assessment.

Living Expenses

Your monthly living expenses play a major role in borrowing power.

Lenders will usually compare the expenses you enter against benchmark spending measures such as the Household Expenditure Measure (HEM). If your declared expenses are lower than the benchmark, the lender may use the higher figure instead.

Typical living expenses include:

Existing Debts and Financial Commitments

All existing liabilities must be included in a borrowing capacity assessment.

Examples include:

These commitments reduce the income available to service a new mortgage.

These commitments reduce the income available to service a new mortgage.

Interest Rate Buffers

Australian lenders apply a serviceability buffer when assessing home loan applications.

This means the loan is assessed at a higher interest rate than the actual loan rate to ensure borrowers can still afford repayments if interest rates rise.

Many lenders assess loans at around 3% above the actual rate.

This conservative approach protects both borrowers and lenders from future rate increases.

Number of Dependants

Dependants can reduce borrowing capacity because lenders assume higher household expenses.

Examples include:

Why Borrowing Capacity Can Differ Between Lenders

One important thing many borrowers don’t realise is that borrowing capacity can vary significantly between lenders.

Each lender has different:

This is why two banks may produce very different borrowing limits using the same income.

A mortgage broker can compare multiple lenders to identify which ones may provide the strongest borrowing capacity for your situation.

How to Increase Your Borrowing Capacity

If the calculator result is lower than expected, there are several strategies that may improve borrowing power.

Reduce or close unused credit cards

Lenders assess repayments based on the card limit, not the balance.

Pay down personal debts

Reducing car loans or personal loans can increase borrowing capacity.

Consolidate high-interest debt

Refinancing or consolidating debts can reduce monthly commitments.

Apply jointly with a partner

Two incomes can significantly increase borrowing power.

Review lender options

Some lenders are more flexible with certain income types or expense assumptions.

Important: Calculator Results Are an Estimate

Borrowing capacity calculators are helpful planning tools, but they cannot fully replicate lender credit policies.

Actual loan approval depends on:

This means your actual borrowing limit may be higher or lower than the estimate shown in the calculator.

Related Home Loan Calculators

You may also find these calculators helpful when planning a home purchase or refinance.

• Home Loan Repayment Calculator
  Estimate your monthly mortgage repayments based on loan amount, interest rate, and term.

• Home Equity Calculator
  Calculate how much usable equity may be available in your property.

• Refinance Savings Calculator
  See how switching lenders could reduce your repayments or shorten your loan term

• Mortgage Reduction Strategy Calculator
  Use the calculator to estimate how soon you will pay off your home loan with the correct loan structure.
  

Speak With a Mortgage Broker for an Accurate Assessment

Online calculators are useful for a starting point, but they don’t consider the full lending picture.

A broker can:

If you want a clear understanding of how much you could realistically borrow, a personalised assessment is the best next step.