Using Home Equity to Buy a Car: Why It Can Cost More

Key takeaways

• Standard car loans usually run 1–7 years, limiting how long interest can accrue (moneysmart.gov.au).
• A lower mortgage rate can still cost more if the car debt sits inside the home loan for decades.
• Keep a 20% equity buffer before redrawing to reduce LVR and LMI risk (moneysmart.gov.au).
• New cars can lose 10%–15% of value the moment they leave the dealer (moneysmart.gov.au).
• Refinancing to release equity can trigger $300–$700 in switching costs (moneysmart.gov.au).
• AFCA handles eligible credit complaints up to a $1,241,000 limit (afca.org.au).

When using home equity to buy a car can look cheaper than it is

Using home equity to buy a car means redrawing, refinancing or topping up the home loan to release cash for a vehicle. The pitch sounds clean: your mortgage rate sits below a car loan comparison rate, so the cheaper money should win. The catch is term, not rate. Brent Geihlick, Director at GO2 Finance, sees this trade-off regularly — homeowners chasing a lower number without modelling what happens when a car balance rides a 28-year mortgage.

Why can a lower home loan rate still cost more?

Interest compounds across the time the debt actually exists. A 6% mortgage rate on $50,000 carried for 30 years generates more total interest than an 8% car loan repaid in five. The real question is whether redrawing is cheaper than a car loan after fees, total interest and repayment discipline are included. Equity release is not a credit-check shortcut, either — lenders still run full serviceability assessments under the NCCP framework (moneysmart.gov.au). Three tests decide the outcome: repayment term, LVR and equity buffer, and whether you want vehicle debt secured against the family home.

Home equity vs car loan at a glance

Home equity and car loans differ across six factors that matter more than headline rate: total interest, term, security, LVR, fees and depreciation fit. Always compare total repayments, not the sticker rate alone.

Factor

Using home equity, redraw or refinance

Standalone car loan

Headline rate vs total interest

Lower rate, but can cost more if repaid over the remaining mortgage term.

Higher rate, but a 1–7 year term limits total interest (moneysmart.gov.au).

Repayment discipline

Needs a separate plan or split so the car portion clears quickly.

The loan term forces a defined payoff date.

Security

Debt is secured against the home through the mortgage.

Secured car loans are tied to the vehicle — see our secured vs unsecured finance comparison for more on how security affects risk.

LVR and LMI

Can raise the loan balance and erode the 20% equity buffer (moneysmart.gov.au).

Does not directly raise home loan LVR.

Fees

Refinancing may trigger $300–$700 in switching costs (moneysmart.gov.au).

Application, monthly or early payout fees vary — compare the total repayment cost.

Depreciation fit

Risk of paying for the car long after it has lost significant value.

Shorter term aligns better with the ownership and depreciation cycle.

Both options affect serviceability and future borrowing capacity. Neither is a free pass on credit assessment.

The home equity deeper dive: redraw, refinance and the amortisation trap

Home equity can be cost-effective only if the car portion is repaid like a short-term car loan, not left to amortise inside the mortgage for decades. That is the amortisation trap: a lower rate stretched over a longer term produces more total interest, not less.

• Home equity
  • The difference between property value and what is still owed on the home loan.
• Redraw facility
  • A home loan feature that may let you access extra repayments already made (moneysmart.gov.au).
• Offset account
  • A transaction account linked to a home loan that can reduce the interest charged on the outstanding balance.
• LVR
  • Loan-to-Value Ratio; the loan balance expressed as a percentage of the property value.
• LMI
  • Lenders Mortgage Insurance, which may apply when the borrower’s equity buffer falls below the lender’s threshold.
• Amortisation
  • The process of repaying principal and interest progressively over the full loan term.
• Comparison rate
  • A loan rate that includes certain fees and charges to help compare the true cost across products.

Worked example. Take $50,000 at 8% over five years on a car loan: roughly $10,800 in total interest. That same $50,000 added to a 6% mortgage and carried on minimum repayments for 30 years: roughly $57,900 in interest. Now the other side — $50,000 at 6% repaid over five years through a structured split with automatic extra repayments: about $8,000 in interest. Repayment discipline is the deciding variable. Rate alone tells you very little.

What happens to your LVR when you add a car to the mortgage?

Adding $50,000 to a mortgage on an $800,000 home with a $560,000 balance pushes the loan from 70% to roughly 76% LVR. Get closer to 80% and the equity buffer thins quickly. Cross that threshold on certain restructures and Lenders Mortgage Insurance can re-enter the picture — a cost that can easily exceed any interest saving. Borrowers need to keep at least a 20% equity buffer to stay clear of LMI risk (moneysmart.gov.au).

Could refinancing costs wipe out the interest-rate saving?

Yes, on smaller balances. Discharge and establishment fees of $300–$700 can erase a year or more of rate savings when the car balance is modest (moneysmart.gov.au). Factor in depreciation as well — a new car can shed 10%–15% of its value the day it is driven away (moneysmart.gov.au). Paying mortgage interest on a depreciating asset that has already shed value makes the maths uncomfortable fast.

Illustrative scenario — Emily and Sam. A $52,000 new family SUV. Their broker compared a 5-year secured car loan against adding the balance to the 28 years remaining on a redraw. Without a strict 5-year repayment plan on the redraw and a protected equity buffer, the standalone car loan was the cleaner structure.

The car loan deeper dive: shorter terms, comparison rates and clearer security

A standalone car loan may carry a higher rate, but the shorter term keeps total interest contained and security clearly defined. Standard car loans usually run 1 to 7 years, aligning the debt more closely with the vehicle ownership window (moneysmart.gov.au).

How should you compare a car loan comparison rate with a home loan rate?

Use total repayments and fees across each option’s actual term, not the headline rate in isolation. The comparison rate captures certain fees on the car loan side. On the mortgage side, model what the car portion will genuinely cost if it stays inside the loan. Our first car buying guide Australia walks through the structure and cost basics for first-time buyers.

When does a standalone car loan protect your mortgage?

Whenever you want a depreciating asset kept separate from your home security. Secured car loans tie to the vehicle; unsecured personal loans avoid asset security altogether but typically price higher. Watch balloon and residual payments too — a low monthly repayment that hides a large back-end lump sum is a stretched term in disguise.

Illustrative scenario — Raj. A $24,000 used hatchback. With a strong equity buffer kept above 20%, lender approval in place, and an automatic 4-year accelerated redraw split, home equity worked — because the term mirrored a car loan and the buffer stayed intact throughout.

Want a second set of eyes before you add a car to your mortgage? GO2 Finance compares total-cost options across 50+ lenders before you commit. Call 0440 131 621 or send a quick online enquiry.

Which is right for you: how to choose between home equity and a car loan

Home equity may suit disciplined borrowers with a strong buffer and a short repayment plan; a standalone car loan suits borrowers wanting separated, shorter-term debt that does not touch the home.

How to choose between home equity and a car loan

1. Set the same car balance. Compare both options on the exact vehicle price and deposit so the maths is fair from the start.
2. Match the repayment term. Model the home equity option over a car-loan-like term as well as the full remaining mortgage term — both numbers matter.
3. Calculate total interest and fees. Include comparison rates, refinancing or discharge costs, monthly fees and any early payout penalties. Our first car buying budget guide covers the key cost workings.
4. Check LVR, equity buffer and serviceability. Confirm the equity release keeps a 20% buffer and passes responsible-lending checks (moneysmart.gov.au).
5. Choose the lowest real risk. Prefer the option that clears the depreciating car debt quickly without placing the home or future borrowing capacity under unnecessary pressure.

Should you use redraw only if you can repay the car portion quickly?

Yes. Green-light scenarios share four traits: a strong equity buffer above 20%, lender approval, a separate split for clean accounting, and automatic extra repayments that clear the car portion within 1–7 years.

What red flags suggest a car loan is the safer structure?

LVR sitting near 80%, uncertain or irregular income, plans to refinance in the short term, weak repayment discipline, or a brand-new car shedding value rapidly. Lenders can decline or limit equity release on serviceability, LVR or loan-purpose grounds — it is always a fresh credit decision. If a dispute arises later, AFCA handles eligible complaints up to $1,241,000 (afca.org.au), a useful consumer right to know about rather than a reason to borrow.

Why GO2 Finance for using home equity to buy a car

GO2 Finance helps homeowners compare the real cost of car finance structures before they commit — total interest, fees and term, not just the headline rate.

• Compares total interest, fees and term length rather than headline rate alone.
• Models redraw, refinance and standalone car loan scenarios over matched repayment terms.
• Checks LVR, equity buffer and future borrowing implications before recommending a structure.
• Explains secured and unsecured car finance options in plain English under a responsible-lending lens.
• Direct access to our Director, Brent Geihlick, who personally reviews complex applications.
• Helps set a repayment strategy so a depreciating vehicle does not sit inside the mortgage for decades.
• Coordinates lender options across a 50+ panel without implying any particular outcome on approval.

What we see at GO2 Finance, across our 50+ lender panel, is one pattern repeating: clients who arrive convinced equity release is the cheaper path leave with a clearer picture once total interest is modelled across the actual term they would carry the car balance. Brent often runs the side-by-side numbers on the first call. Sometimes equity wins. Often the car loan does. The structure that wins is always the one that survives the full maths, not just the rate comparison.

Start with a short online enquiry or phone call with GO2 Finance on 0440 131 621. We will compare using home equity with a standalone car loan side by side — no credit hits at the quote stage.