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Home buyer considering how much to borrow rather than using their full borrowing capacity.
Published in: Financial Advice

How Much Should You Borrow for a Home? Your Maximum Borrowing Capacity Isn’t Your Budget

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Finding out that a lender may be willing to lend you $800,000, $900,000 or even $1 million can be exciting. But here’s something many buyers don’t hear often enough: You don’t have to borrow it. Your maximum borrowing capacity tells you what you may be able to borrow under a lender’s assessment criteria. It doesn’t tell you how much you should borrow, how much you will be comfortable repaying or how much of your income you want committed to your mortgage. There is a big difference between “How much can I borrow?” and “How much should I borrow?” At 20/20 Finance Brokers, we believe that distinction matters. Building wealth doesn’t have to mean stretching yourself to the maximum. A property strategy should be manageable enough that you can continue living your life, handle unexpected expenses and have choices available to you in the future. Your maximum borrowing capacity is a ceiling — not a target.

What Is Borrowing Capacity?

Borrowing capacity is an estimate of how much a lender may be prepared to lend based on your financial circumstances and that lender’s lending criteria. It isn’t determined by your income alone. A lender may consider factors including:
  • Your income
  • Your living expenses
  • Existing loans
  • Credit card limits
  • HECS-HELP or other liabilities
  • Number of dependants
  • Child support or other financial commitments
  • The proposed loan amount
  • Interest rates and the lender’s assessment rate
  • The loan term
  • Deposit and other available funds
  • The lender’s individual credit policy
This is why two people earning the same salary can have very different borrowing capacities. It is also why the borrowing capacity shown by one lender may be different from another. Existing borrowing capacity resources on the 20/20 Finance website explain how these calculations can vary between borrowers and lenders.

Your Borrowing Capacity Is Not Your Property Budget

This is one of the most important distinctions to understand before you start looking at properties. Imagine a lender determines that you could potentially borrow $900,000. That does not mean you should immediately start looking at $900,000 properties. You might decide that a $700,000 loan gives you a much more comfortable level of repayments. Or perhaps $800,000 is the right balance. The important thing is that the decision shouldn’t be made simply because the lender says the higher amount is possible. Your property budget should reflect your whole financial life, not just the maximum amount a lender is prepared to lend.

Why Would You Choose to Borrow Less?

There are several reasons why borrowing below your maximum can be a sensible decision.

1. Lower repayments

The larger the loan, the larger the repayments will generally be, all else being equal. A lower loan can give you more breathing room each pay cycle. That matters because your mortgage isn’t your only expense. You still need to pay for:
  • Food
  • Utilities
  • Insurance
  • Transport
  • Rates
  • Maintenance
  • School and family expenses
  • Holidays and entertainment
  • Unexpected costs
  • Other financial goals
A mortgage that technically fits within a lender’s assessment isn’t necessarily the mortgage that will make you feel financially comfortable.

2. More protection if interest rates change

If you have a variable-rate loan, your repayments can change when your interest rate changes. The larger your loan balance, the greater the impact of an interest-rate increase can be on your repayments. Borrowing less doesn’t eliminate interest-rate risk, but it can reduce the size of the debt you’re carrying. This can give you more room to adapt if your financial circumstances change.

3. More financial breathing room

Life rarely stays exactly the same for the next 20 or 30 years. You might:
  • Have children
  • Change careers
  • Start a business
  • Reduce your working hours
  • Take parental leave
  • Help family members
  • Replace a vehicle
  • Renovate
  • Experience an unexpected expense
A mortgage that consumes every available dollar can make those changes much harder to manage. Having some financial breathing room can be valuable.

4. You can build wealth without maximising debt

There is a common assumption that the more property you can buy, the more wealth you can build. It isn’t that simple. Taking on more debt creates greater financial commitments. Property values don’t rise in a straight line, rental income isn’t guaranteed, interest rates change and unexpected costs happen. A sustainable approach can mean deliberately choosing a loan size that leaves you with room to continue building wealth over time. You don’t have to maximise your debt to maximise your financial future.

5. You may want capacity for your next move

Your first property purchase doesn’t necessarily have to be your final financial decision. You may eventually want to:
  • Buy another property
  • Purchase an investment property
  • Renovate
  • Upgrade your home
  • Start a business
  • Invest in other assets
  • Help your children
  • Reduce your working hours
Taking on the maximum amount of debt today may affect the options available to you tomorrow. That doesn’t mean you should deliberately borrow as little as possible. It means your first loan should be considered in the context of where you may want to go next.

What If You Can Afford the Bigger House?

Sometimes the property you genuinely want to buy costs more. That doesn’t automatically mean you shouldn’t buy it. The question is whether the additional borrowing provides enough value to justify the additional financial commitment. For example, you might be comparing two homes: Home A: $700,000 Home B: $850,000 Home B might have an extra bedroom, better location or features that are genuinely important to your family. If the additional repayments are comfortably manageable and the property better meets your needs, the higher purchase price may make sense. But if buying Home B means constantly worrying about repayments, having no emergency buffer and being unable to do anything else financially, the additional property may not be worth the pressure. Affordability isn’t just about whether the lender will approve the loan. It’s also about whether the debt fits comfortably into the life you want to live.

What Does “Affordable” Actually Mean?

There isn’t one universal percentage of your income that determines whether a mortgage is affordable. Different households have different circumstances. Someone with a high income and minimal commitments may have a very different capacity to comfortably manage a mortgage than someone earning the same amount while supporting several dependants. Instead of asking only: “What percentage of my income will go towards the mortgage?” look at the bigger picture. After your proposed mortgage repayment and normal living expenses, would you still have enough money to:
  • Maintain an emergency buffer?
  • Cover annual expenses?
  • Deal with unexpected costs?
  • Continue saving?
  • Enjoy your life?
  • Manage potential interest-rate changes?
  • Work towards other goals?
If the answer is yes, you may be in a much stronger position than someone who has borrowed right up to their limit.

What About the Deposit?

Your deposit also affects the amount you need to borrow. For example, if you have $150,000 available and purchase a $700,000 property, you may need to borrow significantly less than if you purchased an $850,000 property. But don’t automatically assume that putting every dollar you have into the deposit is the best strategy either. You may need to retain funds for:
  • Stamp duty where applicable
  • Conveyancing and legal costs
  • Inspections
  • Moving expenses
  • Repairs
  • Renovations
  • Furniture
  • Emergency savings
There can be a difference between having enough money to complete a purchase and having enough money to comfortably own the property after settlement.

Should You Use Your Maximum Borrowing Capacity?

Not necessarily. Your borrowing capacity can be useful for establishing your upper limit, but you can then work backwards to determine a more comfortable borrowing amount. For example: Maximum borrowing capacity: $900,000 You might decide: Preferred loan amount: $750,000 That $150,000 difference isn’t wasted borrowing capacity. It represents financial flexibility you have chosen not to use. That could be valuable if your circumstances change.

What If Borrowing Less Means Buying a Different Property?

This is where the decision becomes more personal. Borrowing less may mean:
  • Looking in a different suburb
  • Buying a smaller home
  • Choosing a townhouse instead of a house
  • Buying an established property rather than a newer one
  • Delaying a purchase while saving more
  • Considering a different property strategy
None of these automatically represents a better or worse decision. The right choice depends on what matters most to you. If buying a particular property means you will be financially stretched for decades, it may be worth considering whether a different property could give you a better balance between lifestyle and financial security.

Could Borrowing Less Help You Build More Wealth?

Potentially, yes — but not because smaller debt automatically produces greater investment returns. The advantage is financial flexibility. A manageable mortgage may allow you to maintain cash reserves, make additional repayments if appropriate, continue saving or eventually invest elsewhere. It can also reduce the amount of interest you pay over time if you repay the debt faster. For example, if two households have similar incomes but one carries significantly more debt, the household with the smaller mortgage may have more disposable income available for other goals. That’s why property wealth shouldn’t be measured purely by the value of the property you own. Your ability to comfortably hold the asset matters too.

Does Borrowing Less Mean You Should Buy the Cheapest House?

No. This is not an argument for buying the cheapest property you can find. A cheaper property isn’t necessarily a better property. Location, condition, suitability, future needs, property type and your overall strategy all matter. The goal is to find the right balance between: The property you need + the debt you can comfortably manage + your longer-term goals. That is very different from simply buying the most expensive property the bank will approve.

What About Investment Property Buyers?

The same principle applies to investors. If your borrowing capacity allows you to purchase an investment property for $900,000, you don’t necessarily need to spend $900,000. An investment property should be assessed on its own merits, including:
  • Purchase price
  • Rental income
  • Rental demand
  • Property expenses
  • Location
  • Property type
  • Potential capital growth
  • Vacancy risk
  • Loan structure
  • Your ability to hold the property
More expensive doesn’t automatically mean better investment. Likewise, cheaper doesn’t automatically mean better. The property needs to fit the strategy.

What About Rentvestors?

For someone considering rentvesting, borrowing less can be particularly relevant. You might have enough borrowing capacity to purchase an expensive home to live in, but choose to continue renting while purchasing an investment property instead. Alternatively, you might decide to buy a more modest home to live in and preserve some borrowing capacity for future investment. There isn’t a single correct answer. The important thing is to understand what each option does to your:
  • Cash flow
  • Debt
  • Borrowing capacity
  • Government scheme eligibility
  • Future options
  • Overall financial flexibility
Our previous article explores the decision between buying a home to live in and purchasing an investment property first in more detail.

The Best Loan Isn’t Necessarily the Biggest Loan

There can be a temptation to think that getting approved for a larger loan means you’ve achieved a better outcome. It doesn’t. A successful home loan isn’t simply one that gets you across the settlement line. It should also be manageable after settlement. The right loan amount should allow you to own your property without making the rest of your financial life unnecessarily difficult. More borrowing gives you more property. Less borrowing can give you more flexibility. The right balance depends on you.

Questions to Ask Before Deciding How Much to Borrow

Before committing to a property, ask yourself:
1. What repayment would I genuinely be comfortable with?
Not the repayment you can technically survive — the repayment you can comfortably manage.
2. What would happen if interest rates increased?
Would the higher repayment still be manageable?
3. Would I still have an emergency buffer?
Buying a property shouldn’t necessarily leave you with nothing in reserve.
4. What other goals do I have?
Consider future investments, children, business plans, travel, renovations or reducing your working hours.
5. Am I buying the property because I need it or because the bank says I can?
There is a difference.
6. What happens if my circumstances change?
A loan should ideally leave some room for life to happen.
7. Could borrowing less actually give me more options later?
Sometimes the most valuable part of your borrowing capacity is the portion you choose not to use.

The Bottom Line

Your maximum borrowing capacity can be useful information. But it shouldn’t automatically become your property budget. The bank’s maximum is their assessment of what you may be able to borrow. It isn’t a recommendation for what you should owe. Borrowing less can mean lower repayments, more financial breathing room and greater flexibility to respond to whatever comes next. That doesn’t mean everyone should borrow less. It means you should choose your debt deliberately. At 20/20 Finance Brokers, we believe building wealth should be manageable. The objective isn’t simply to help you borrow the biggest amount possible. It’s to understand your options and structure finance around your circumstances and goals. Because being able to borrow more doesn’t necessarily mean you’ll be better off borrowing more.

Frequently Asked Questions

How much should I borrow for a home?

There isn’t a universal dollar amount or percentage of income that is appropriate for everyone. The right amount depends on your income, expenses, existing debts, dependants, deposit, interest rate, financial buffer and future goals. Your maximum borrowing capacity can provide an upper limit, but you may choose to borrow less if a smaller loan gives you greater financial flexibility.

Is my maximum borrowing capacity how much I can afford?

Not necessarily. Borrowing capacity is calculated using a lender’s assessment criteria and is designed to determine whether you can service a proposed loan under that lender’s requirements. It doesn’t necessarily reflect the lifestyle, savings goals or level of financial flexibility you personally want after taking on the mortgage. You can be approved for a particular amount and still decide that borrowing less is more appropriate for you.

Should I borrow the maximum amount the bank will lend me?

No. You don’t have to use your maximum borrowing capacity. Borrowing less can result in lower repayments and may leave you with more room for savings, unexpected expenses and future goals. The right amount depends on your circumstances and priorities rather than simply the highest figure a lender is willing to approve.

Is it better to have a smaller mortgage?

A smaller mortgage can have advantages, including lower repayments and potentially less interest paid over the life of the loan. It can also provide more financial flexibility. However, borrowing less isn’t automatically better if it means compromising on a property that genuinely suits your needs or delaying a purchase unnecessarily. The objective is to find a manageable balance between the property you want and the debt you are comfortable carrying.

How does borrowing less affect my future?

Borrowing less may leave you with greater financial flexibility. Depending on your circumstances, you may have more capacity to save, make additional repayments, handle unexpected expenses or consider another investment in the future. However, future borrowing capacity depends on many factors and cannot be guaranteed simply because you have borrowed less.

Can I buy a house without using all my borrowing capacity?

Yes. Your borrowing capacity is a maximum assessment figure, not a required loan amount. You can choose a property and loan amount below that figure. For example, if your borrowing capacity is $900,000, you might choose to purchase a property requiring a $700,000 loan because that repayment better suits your financial goals.

Does borrowing less mean I should buy a cheaper property?

Not necessarily. A lower-priced property isn’t automatically better. Property type, location, suitability, condition and your longer-term goals all need to be considered. Borrowing less is about managing your debt at a comfortable level, not simply buying the cheapest property available.

Could borrowing less help me build wealth?

It can provide greater financial flexibility, which may support long-term wealth-building goals. A smaller mortgage can mean lower repayments and potentially less interest over time. It may also leave more room for savings, additional repayments or future investments. However, property wealth depends on many factors, and borrowing less does not guarantee a better financial outcome.

How much deposit should I keep after buying a home?

There isn’t a single amount that is right for every borrower. You should consider whether you need funds for purchasing costs, moving, repairs, furnishing, emergencies and other expected expenses. Using every available dollar as a deposit can reduce the loan required, but leaving yourself with no cash buffer can create financial pressure if an unexpected expense occurs.

Can borrowing less protect me if interest rates rise?

A smaller loan generally means the dollar impact of an interest-rate increase is lower than it would be on a larger loan, assuming the same rate and loan structure. It doesn’t remove interest-rate risk, but having a smaller debt can provide more room in your household cash flow if repayments increase.

Why do two people with the same income have different borrowing capacities?

Lenders consider more than income. Existing debts, credit card limits, living expenses, dependants, HECS-HELP debt, other financial commitments and the lender’s individual assessment policies can all affect borrowing capacity. This is why two people earning the same salary can receive different borrowing capacity outcomes.

Should I choose a home loan based on the maximum I can borrow?

No. The maximum amount available should be only one part of the decision. You should also consider the loan’s interest rate, fees, features, repayment structure and how the repayments fit into your broader financial position. Different lenders assess applications differently, so comparing options can be important when determining what is suitable for your circumstances.

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