What is a mortgage?

Updated 12 Mar 2026Content was accurate at the time of publication

A mortgage is the legal charge a lender holds over property to secure a loan. Put simply, the mortgage is the security; the home loan is the credit product that provides the money. This distinction matters: your home loan agreement sets out the loan amount, interest rate, repayments and features, while the mortgage (or charge) gives the lender the right to repossess or sell the property if you default. Buying a home and taking out a mortgage is one of the biggest financial decisions most people make — understanding mortgage types, costs, eligibility and risks helps you make better choices.

This article explains mortgage meaning, how mortgages work in Australia, common mortgage types, key costs, eligibility, comparison tips and next steps so you can compare offers with confidence.

How mortgages work

A mortgage-backed loan typically includes these components:

Principal: the amount you borrow.
Interest: the cost of borrowing, charged as a percentage of the outstanding loan.
Term: the length of the loan (commonly 25–30 years).
Repayments: scheduled amounts you pay (weekly/fortnightly/monthly) to reduce principal and interest.
Security: the mortgage registered on title that protects the lender.

Key processes and terms:

Discharge: when you repay the loan in full, the mortgage is removed (discharged) from the property title.
Valuation: lenders will arrange a valuation or require a certificate to confirm the property value.
Repossession risk: if you default, the mortgage gives the lender a legal path to sell the property to recover the debt.

Simple example:

Property value: $100,000
Loan amount: $180,000 → LVR = 480,000 / 600,000 × 100% = 80%
Repayment type: principal & interest over 25 years
Interest charged monthly on the outstanding balance

LVR (loan-to-value ratio) influences pricing, lending policies and whether Lenders Mortgage Insurance (LMI) may be required.

See more on home loans at https://emumoney.com.au/home-loans and use a borrowing power calculator to estimate what you might borrow.

Common mortgage types

Below are the main mortgage and home-loan structures you'll encounter, who typically uses them, and the pros and cons.

Variable rate mortgage

How it works: Rate can move with the market or lender repricing. Who it's for: borrowers who want flexibility or plan extra repayments. Pros: redraw/offset features are common; no fixed break costs. Cons: rate increases raise repayments; budgeting can be harder.

Fixed rate mortgage

How it works: Interest rate locked for a period (e.g., 1–5 years). Who it's for: borrowers seeking repayment certainty. Pros: predictable payments; protects against short-term rate rises. Cons: limited flexibility, potential break costs, fewer features.

Split loan

How it works: part fixed, part variable. Who it's for: borrowers wanting some certainty and some flexibility. Pros/Cons: mix of features and risks from both sides.

Interest-only mortgage

How it works: repayments cover interest only for a set period. Who it's for: investors or borrowers wanting lower short-term payments. Pros: lower payments while interest-only; cash flow flexibility. Cons: no principal reduction means higher long-term interest; limited availability and caps on length.

Principal & interest mortgage

How it works: repayments reduce both principal and interest. Who it's for: most owner-occupiers wanting to repay debt. Pros: builds equity; predictable amortisation. Cons: higher repayments than interest-only at the start.

Line of credit / home equity loan

How it works: revolving facility secured by property; you draw and repay as needed. Who it's for: borrowers needing flexible access (renovations, investments). Pros: flexibility; interest charged only on drawn amount. Cons: risk of overdrawing; potential variable rates.

Construction loan

How it works: progress payments as building stages complete; interest on drawn balance. Who it's for: building a new home or major renovations. Pros/Cons: staged draws, requires builder contracts and inspections.

Guarantor loan

How it works: a guarantor (often a family member) provides security, usually via property. Who it's for: borrowers with small deposits or limited history. Pros: reduces or avoids LMI; helps first-home buyers. Cons: guarantor risk; possible requirement to register a mortgage over guarantor property.

Low-doc loans

How it works: lending with reduced income documentation for certain borrowers (e.g., self-employed). Who it's for: self-employed or irregular income applicants. Pros/Cons: usually higher rates and stricter LVR limits.

Reverse mortgage (for older property owners)

How it works: converts property equity into cash, repaid later (often on sale or death). Who it's for: older homeowners needing income/retirement funding. Pros/Cons: interest compounds, reduces equity; important to understand long-term effects.

For related financing structures, see these A-to-Z guides for broader borrowing context:

Mortgage comparison table

Type	Typical features	Pros	Cons	Who it's best for
Variable rate	Flexible features, offset/redraw	Flexibility, often cheaper at times	Rate risk	Most borrowers
Fixed rate	Locked rate for a term	Payment certainty	Break costs, limited features	Rate-sensitive borrowers
Interest-only	Lower short-term payments	Short-term cash flow relief	No equity growth, higher long-term cost	Investors (short term)
Split	Mix fixed & variable	Balanced risk	Complexity	Borrowers wanting both features
Line of credit	Revolving, secured by home	Great flexibility	Discipline needed	Renovators/investors
Guarantor loan	Guarantor provides security	Avoid/less LMI	Risk to guarantor	First-home buyers with family help

Key costs and fees

A mortgage involves more than the stated interest rate. Key costs include:

Interest charges: the primary ongoing cost; compare structures (variable vs fixed).
Establishment / application fees: one-off charges when opening a loan.
Ongoing fees: account-keeping, package fees or annual fees.
Valuation / settlement fees: lender valuation and legal/conveyancing costs.
Discharge / exit fees: fees when you repay and remove the mortgage.
Lenders Mortgage Insurance (LMI): generally required if LVR is above a lender's threshold (often 80%); paid once and may be added to or capitalised into the loan.
Stamp duty: state/territory charge on property transactions—amounts vary; check your State Revenue Office for exact figures.
Break costs: fees for ending a fixed-rate contract early (may be significant).

Always review the lender's Key Facts Sheet and the comparison rate (noting comparison rates have limitations) to understand the total cost.

Eligibility and what lenders look for

Lenders assess applications against serviceability and risk criteria:

Income: payslips, tax returns, business statements.
Employment stability: permanent employment or history of consistent earnings.
Expenses: living costs, existing debts, credit cards, child support.
Credit history: defaults, bankruptcies, or missed payments reduce approval chances.
Deposit size: deposit amount and source (savings, gift, guarantor).
Loan-to-value ratio (LVR): lower LVRs improve pricing and reduce the need for LMI.
Property type: location, type (house vs. apartment), and planned use (owner-occupier vs. investment) affect lending decisions.
Serviceability tests: lenders apply interest rate buffers and living expense assumptions to ensure you can repay if rates rise.

Use a borrowing power calculator and review documentation lists before applying to reduce delays.

Applying for a mortgage — step by step

A typical application flow:

Pre-approval (1–5 business days): preliminary assessment of how much you may borrow based on initial documents. Useful for property offers.
Property search & contract: negotiate contract and include any conditions required.
Formal application (1–3 weeks): full documentation submitted; the lender orders valuation and performs detailed checks.
Valuation & verification (several days–2 weeks): lender confirms property value and verifies income.
Approval & unconditional loan offer: lender issues a formal loan offer.
Settlement (1–3 weeks after unconditional approval): legal transfer of funds and mortgage registration.
Post-settlement: set up repayments, review offset/redraw options.

Tips to speed the process:

Prepare up-to-date payslips, bank statements, ID and tax returns.
Avoid large unexplained deposits or new credit during application.
Read the Key Facts Sheet and loan contract before signing.

Repayments, examples and how interest affects your loan

Repayment structures matter:

Worked example 1 — Principal & interest:

Loan: $100,000
Term: 25 years
Rate: 5.00% p.a. (variable example)
Monthly repayment (approx): $1,912

Worked example 2 — Interest-only (5-year term), same loan and rate:

Interest-only monthly payment (approx): $1,083
After 5 years, principal remains $100,000 (unless you make extra repayments)

Extra repayments effect:

Paying an extra $100 per month on the P&I example can reduce total interest and shorten the loan term significantly. Small extra amounts compound into substantial savings over decades.

For personalised calculations, use an online repayment calculator or a lender/broker tool. Remember calculators illustrate scenarios — actual repayments depend on your loan contract, fees and any changes to rate.

Risks and important considerations

Understand these risks:

Interest-rate risk: variable rates can rise, increasing repayments.
Negative equity: property values can fall below your outstanding loan.
Default & repossession: persistent missed payments can lead to enforcement and sale of the property.
LMI consequences: LMI protects the lender, not you; if you default, you remain liable even if LMI was paid.
Guarantor risk: guarantors may lose equity in their property and remain responsible for the debt.
Restrictions on interest-only: lenders now limit interest-only periods; read loan terms carefully.
Tax for investors: interest may be deductible for investment properties but tax outcomes are complex — consult the Australian Taxation Office for guidance: https://www.ato.gov.au/General/property/investment-properties

If you struggle with payments, contact your lender early to discuss hardship options.

How to compare mortgage offers

Checklist when comparing:

Interest rate and type (variable/fixed/split).
Fees: establishment, ongoing, discharge, valuation and break costs.
Features: offset account, redraw, extra repayment flexibility.
Comparison rate caveats: comparison rates include certain fees but not all; they are an approximation.
Key Facts Sheet: mandatory document — read for full fees and features.
Exit penalties and break costs for fixed portions.
Customer service, digital tools and complaint handling record.
Consider total cost over the time you expect to hold the loan, not only the headline rate.

Use lender Key Facts Sheets and independent regulator guidance before deciding — ASIC MoneySmart is a useful starting point: https://moneysmart.gov.au/borrowing-and-credit/home-loans

When to talk to a broker or financial adviser

A mortgage broker acts as an intermediary who can compare multiple lenders and help with paperwork. Consider a broker when:

Your finances are complex (self-employed, multiple income streams).
You're comparing many lenders or seeking a specialised product.
You need help understanding LMI, guarantor structures or interest-only strategies.

Check broker credentials, commissions and whether they are authorised. For regulated guidance see ASIC MoneySmart. For complex tax or investment strategies, consult a licensed financial adviser or tax specialist.

FAQ

What is the difference between a mortgage and a home loan?

A mortgage is the security (legal charge) over property. A home loan is the credit product that provides the funds and sets repayments and features.

How much deposit do I need for a mortgage?

Many lenders accept a 20% deposit to avoid LMI, but smaller deposits (e.g., 5–10%) may be possible with LMI or a guarantor. LVR affects pricing.

What is Lenders Mortgage Insurance (LMI) and when do I need it?

LMI is insurance that protects the lender if you default; it's typically required when LVR exceeds a lender's threshold (commonly 80%).

Should I choose a fixed or variable rate mortgage?

It depends on your need for certainty versus flexibility. Fixed rates give payment stability; variable rates often provide features like offset and redraw.

What is an interest-only mortgage and who should consider it?

Interest-only allows lower payments for a set period but does not reduce principal. It may suit short-term investors; long-term it is more expensive.

How does my credit history affect getting a mortgage?

Credit history influences approval, interest rates and lender risk assessment. Defaults or bankruptcy reduce borrowing options.

Can I make extra repayments or redraw funds?

Many variable loans permit extra repayments and redraw; fixed loans often limit this. Check loan features in the Key Facts Sheet.

What fees should I expect when getting a mortgage?

Expect application/establishment fees, valuation, ongoing account fees, LMI (if applicable), settlement and discharge fees, and possible break costs for fixed loans.

How long does mortgage approval and settlement take?

Pre-approval can take days; formal approval often takes 1–3 weeks; settlement timing depends on contracts but typically follows approval by 1–3 weeks.

What happens if I can't make my mortgage payments?

Contact your lender early to discuss hardship options. Prolonged arrears can lead to enforcement and sale of the property.

Are mortgage interest payments tax-deductible for investment properties?

Interest on loans used to produce assessable income (investment properties) is generally deductible, subject to specific rules. See the ATO guidance: https://www.ato.gov.au/General/property/investment-properties

When should I talk to a mortgage broker?

Talk to a broker when you want help comparing lenders, have complex finances, or need assistance managing paperwork and negotiations.

Key takeaways

A mortgage is the security registered on your property, while a home loan is the credit product that funds your purchase. Understanding the types of mortgages available, the costs involved, and how to compare offers will help you make an informed decision about the right loan structure for your circumstances. Consider seeking advice from a broker or financial adviser if your situation is complex.