How Much Can I Borrow for a Home Loan? | Borrowing Power Guide

What Is Borrowing Power and Why Does It Matter?

Borrowing power - also called borrowing capacity - is the maximum amount a lender is willing to let you borrow for a home loan. It's determined by a detailed assessment of your financial position and the lender's own risk appetite.

Understanding your borrowing power is one of the most important first steps in the home-buying journey. It sets the ceiling on what you can realistically offer at auction or negotiate in a private sale, and it shapes every decision that follows - from suburb selection to property type.

The good news is that borrowing power isn't a fixed number carved in stone. It varies between lenders, changes with market conditions, and can be improved with the right financial adjustments. With the RBA cash rate currently at 3.85%, lenders are calibrating their serviceability models accordingly, which directly influences how much you can borrow.

RatePilot currently tracks 2360 home loan products across the Australian market, so there's genuine variation in what different lenders will offer you. Compare home loan rates to see the full picture.

How Do Lenders Calculate Your Borrowing Capacity?

Every lender uses a slightly different formula, but the core calculation follows the same logic: how much can you comfortably repay each month, with a safety margin built in?

Here's what lenders typically assess:

Gross Income

Your total pre-tax income is the starting point. Lenders consider base salary, regular overtime, bonuses, rental income, investment dividends, and government payments. However, not all income is treated equally - most lenders "shade" variable income sources, meaning they'll only count a portion of things like bonuses or overtime because they aren't guaranteed.

If you're self-employed, lenders generally want to see at least two years of tax returns and financial statements to establish a reliable income figure.

Living Expenses

Lenders use either your declared living expenses or the Household Expenditure Measure (HEM) - whichever is higher. HEM is a benchmark that estimates a baseline cost of living based on your household size and income bracket.

In recent years, lenders have placed increasing scrutiny on actual spending habits. Many now review bank statements and categorise transactions to build a realistic picture of your outgoings. This means discretionary spending on things like dining out, subscriptions, and entertainment can genuinely affect your borrowing power.

Existing Debts and Liabilities

Any existing financial commitments reduce your borrowing capacity:

• Credit cards - Even if you pay your balance in full each month, lenders typically assess the full credit limit as a potential liability.
• Personal loans and car loans - Monthly repayments are deducted from your available income.
• HECS-HELP debt - Compulsory repayments are factored into your expenses based on your income level.
• Buy now, pay later (BNPL) - An increasing number of lenders now factor BNPL commitments into their assessments.
• Existing home loans - If you already have a mortgage, the repayments reduce the income available for a new loan.

Number of Dependants

More dependants means higher assumed living expenses, which reduces borrowing capacity. Lenders adjust their expense benchmarks based on household size.

Credit History

A clean credit history doesn't directly increase the amount you can borrow, but negative marks - defaults, late payments, or court judgments - can lead to reduced borrowing limits or outright decline.

How Do Serviceability Buffers Work?

This is where many borrowers get surprised. Lenders don't assess whether you can afford repayments at the actual interest rate you'll be paying. Instead, they add a serviceability buffer on top.

The Australian Prudential Regulation Authority (APRA) sets expectations for how authorised deposit-taking institutions manage lending risk. As part of this, lenders typically add a buffer of around 2–3 percentage points above the loan's interest rate when assessing your ability to repay.

So if a lender's variable rate is, say, near 5.43% p.a., they might assess your repayments as though the rate were significantly higher. This buffer exists to ensure borrowers can still manage repayments if interest rates rise.

The practical effect is substantial. The serviceability buffer can reduce your borrowing power by tens of thousands - or even hundreds of thousands - of dollars compared to what you might expect based on current rates alone.

Why does this matter? When the RBA adjusts the cash rate (currently 3.85%), it flows through to the rates lenders charge, which in turn shifts the rate used in serviceability calculations. Even a small rate change can meaningfully affect borrowing capacity across the market.

How Different Loan Types Affect Borrowing Power

The type of home loan you choose can influence how much a lender is willing to offer you.

Principal and Interest (P&I) vs Interest-Only (IO)

With a P&I loan, you repay both the loan balance and the interest from day one. With an interest-only loan, you only pay interest for a set period (typically up to five years), after which the loan reverts to P&I with higher repayments.

Counterintuitively, choosing interest-only doesn't necessarily increase your borrowing power. Lenders assess IO loans based on the higher P&I repayments that kick in after the IO period ends, often resulting in similar or even lower borrowing capacity.

Variable vs Fixed Rates

Lenders generally assess both variable and fixed-rate loans using the serviceability buffer. However, the base rate used in the calculation may differ. Some lenders use a standardised floor rate (a minimum rate used for assessment purposes regardless of the actual product rate), which can mean the loan type has less impact on borrowing power than you might expect.

Owner-Occupier vs Investment Loans

Investment loans sometimes attract slightly higher interest rates than owner-occupier loans. However, lenders may also factor in rental income from the investment property, which can partially offset the higher rate and support borrowing capacity.

How to Increase Your Borrowing Capacity

If your borrowing power isn't where you need it to be, there are practical steps you can take:

1. Reduce or Close Unused Credit

This is often the single most effective lever. Cancel any credit cards you don't need and reduce the limits on those you keep. Remember, lenders assess the limit, not the balance. A credit card with a high limit - even if you never use it - may reduce your borrowing power by a meaningful amount.

2. Pay Down Existing Debts

Clearing personal loans, car loans, and BNPL balances before applying removes those repayment obligations from the lender's assessment. Paying off or significantly reducing HECS-HELP debt can also help, though the impact depends on your income level and the compulsory repayment threshold.

3. Reduce Discretionary Spending

Since lenders now scrutinise bank statements, reducing visible discretionary spending in the months before you apply can improve your assessed position. This doesn't mean you need to live like a monk, but cutting back on non-essentials demonstrates financial discipline.

4. Increase Your Income

Any documented increase in income directly improves borrowing power. This could mean negotiating a pay rise, taking on additional work, or including a partner's income through a joint application. Joint applications are particularly powerful because they combine two incomes while many fixed costs are shared.

5. Choose a Longer Loan Term

A 30-year loan term results in lower monthly repayments than a 25-year term for the same amount, which can increase the maximum a lender will approve. The trade-off is paying more interest over the life of the loan.

6. Shop Around

Different lenders have different risk models, expense benchmarks, and income policies. Your borrowing power can vary significantly from one lender to the next. Compare home loan rates across the market to find lenders that may assess your situation more favourably.

Common Mistakes That Reduce Borrowing Power

Many borrowers unknowingly sabotage their borrowing capacity. Here are the most common traps:

Keeping Unused Credit Cards Open

As mentioned, a dormant credit card with a high limit is treated as a potential liability. This is the number one avoidable drag on borrowing power.

Applying to Multiple Lenders Simultaneously

Each formal loan application triggers a credit inquiry. Multiple inquiries in a short period can signal financial stress to lenders and may reduce the amount they're willing to offer - or lead to a decline. Use pre-approval tools and calculators first, and only submit formal applications selectively.

Underestimating Living Expenses

If your declared expenses are lower than the lender's assessment based on your bank statements, it raises a red flag. Be honest and thorough when disclosing expenses. Understating them won't increase your borrowing power - it'll slow down the process or result in a lower offer.

Changing Jobs Right Before Applying

Lenders like stability. If you've recently changed jobs, particularly if you've moved from a salaried role to contract or self-employment, lenders may view your income as less certain. Where possible, time your application to coincide with a period of stable employment.

Ignoring BNPL Commitments

Buy now, pay later services are increasingly factored into lending assessments. Even small BNPL balances can chip away at your borrowing power, so clear them before applying.

What Happens After You Know Your Borrowing Power?

Knowing your borrowing capacity is just the starting point. Here's how to use that number wisely:

• Don't borrow the maximum. Just because a lender will give you a certain amount doesn't mean you should take it. Build in a personal buffer for rate rises, unexpected expenses, and lifestyle changes.
• Factor in upfront costs. Stamp duty, conveyancing fees, building inspections, and moving costs all require cash beyond your loan amount. The government's Moneysmart home loan page has useful guides on upfront costs.
• Consider LMI. If your deposit is less than 20% of the property value, you'll generally need to pay Lenders Mortgage Insurance (LMI). This can add thousands to your upfront costs or be capitalised into the loan, reducing your effective borrowing power.
• Get pre-approval. A conditional pre-approval gives you confidence to search within your budget and shows sellers you're a serious buyer.

Compare Home Loan Rates Across the Market

Borrowing power is only half the equation. The interest rate you lock in determines what you'll actually pay over the life of the loan. Even a small difference in rate can translate to significant savings.

The current best variable rate for owner-occupiers (P&I) starts from 5.43% p.a., but rates vary widely across the 2360 products RatePilot tracks.

Compare home loan rates →