When to Consolidate Debt into Your Home Loan

Rolling multiple debts into your mortgage can reduce your monthly repayments by thousands of dollars, but it only works if the total interest you pay over the life of the loan decreases.

Debt consolidation through home loan refinancing replaces short-term debts like credit cards, car loans, and personal loans with a single mortgage at a lower interest rate. The appeal is obvious: instead of juggling multiple repayments at rates between 8% and 22%, you pay one amount at your mortgage rate, which typically sits between 5% and 7%. For Double Bay households managing investment property expenses alongside personal debts, this can free up cashflow quickly. The risk lies in stretching what was a three-year car loan into a 30-year mortgage term without adjusting your repayment strategy.

How Debt Consolidation Works Through Refinancing

You borrow against the equity in your property to pay out existing debts, then consolidate everything into a new or restructured mortgage. Lenders assess your equity position and serviceability just as they would for any refinance application. If your Double Bay property has increased in value since purchase, you may have substantial equity available even with outstanding debts. The lender pays out your credit cards, car loans, and other liabilities directly at settlement, leaving you with one loan and one repayment.

Consider a Double Bay resident with a $900,000 mortgage, $35,000 in credit card debt at 19% interest, and a $25,000 car loan at 9%. Their monthly repayments total around $7,200. By consolidating the $60,000 in debt into their mortgage at 6.2%, the total loan becomes $960,000 with a monthly repayment of approximately $5,900. That's $1,300 less each month. The problem emerges over time: that $60,000 in short-term debt, which would have been cleared in three to five years, now stretches across the remaining mortgage term unless they increase repayments or make lump sum payments.

When Consolidation Makes Financial Sense

Consolidation works when the interest saved on high-rate debts outweighs the cost of extending those debts over a longer term. You should consolidate if you can maintain higher repayments than the minimum on your new mortgage, treating the consolidated portion as a separate debt to clear quickly. It also makes sense when multiple debts are affecting your ability to service a mortgage for a property purchase or investment, and consolidating improves your borrowing capacity.

It doesn't make sense if you only pay the minimum on your new mortgage and let $20,000 in credit card debt drag out over 25 years. A debt that would have cost $8,000 in interest over four years can cost $35,000 in interest over the life of a mortgage, even at a lower rate. You're not saving money, you're just spreading the pain thinner. For this reason, we regularly see consolidation paired with an offset account or redraw facility, where any extra cashflow gets parked against the loan to reduce interest without locking funds away.

The Cost of Refinancing to Consolidate Debt

Refinancing to consolidate debt involves the same costs as any refinance: application fees, valuation fees, discharge fees from your current lender, and potential settlement costs. Expect to pay between $1,500 and $3,000 in total. Some lenders waive application fees or offer cashback incentives that offset these costs, but you should factor them into your comparison. If you're consolidating $15,000 in debt but paying $2,500 to refinance, the numbers need to stack up over at least 12 to 18 months to justify the switch.

Lenders also assess serviceability differently when you're consolidating debt. They want to see that you can manage the new loan amount and that the debts being consolidated weren't caused by ongoing spending problems. If your credit cards are maxed out again three months after consolidation, you've just increased your mortgage without solving the underlying issue. A loan health check before applying helps clarify whether consolidation will genuinely improve your position or just shuffle the problem.

Equity Requirements for Double Bay Properties

Most lenders require you to maintain at least 20% equity in your property after consolidation to avoid Lenders Mortgage Insurance. For Double Bay properties, where values are higher than many Sydney suburbs, this often means you can consolidate significant debts without hitting equity limits. If your property is valued at $2 million and your mortgage is $1.2 million, you have $800,000 in equity. Borrowing an additional $60,000 to clear debts still leaves you with $740,000 in equity, well above the 20% threshold.

If you don't have 20% equity remaining after consolidation, you may still be able to proceed, but you'll pay LMI on the amount borrowed above 80% of the property value. In some situations, particularly where high-interest debts are damaging your credit file or serviceability, paying LMI can still be worthwhile. The calculation depends on how much you're consolidating, the interest rates you're paying now, and how quickly you can rebuild equity. For Double Bay residents with strong income but temporary cashflow pressure, this can be a short-term cost that solves a longer-term problem.

Structuring Your Loan After Consolidation

Once you've consolidated, the way you structure your new mortgage determines whether you actually save money. Splitting your loan into two portions—one for the original mortgage and one for the consolidated debt—lets you target the consolidated portion with extra repayments while maintaining flexibility on the rest. You can also use a fixed rate on the consolidated portion to lock in repayments and force discipline, while keeping your primary mortgage on a variable rate with an offset account.

Another option is consolidating into a single loan with a redraw facility, then setting up automatic extra repayments equal to what you were paying on the old debts. If you were paying $1,300 a month across credit cards and car loans, keep paying that $1,300 into your mortgage as extra repayments. This clears the consolidated debt faster and saves you the long-tail interest cost. Without this discipline, consolidation becomes a way to spend the same money twice: once on the original debt, and again in interest over 30 years.

Tax Implications for Investment Property Owners

If you're consolidating personal debts into a loan secured by an investment property, or using equity from an investment property to clear personal debts, the tax treatment becomes complicated. Interest on debt used for personal purposes isn't tax-deductible, even if the loan is secured against an investment property. This means you need to keep the personal debt portion separate from your investment loan, both in structure and in your records.

For Double Bay investors using debt recycling strategies or holding multiple properties, consolidating the wrong debts into the wrong loan can cost you thousands in lost deductions. If you have $40,000 in personal debt and $600,000 in investment debt, consolidating them into a single loan against your investment property means you lose the ability to claim interest on the $40,000 portion. The ATO requires clear separation, and most lenders can structure your loan with separate splits to maintain this. It's not optional if you want to keep your deductions.

Coming Off a Fixed Rate with Debt to Consolidate

If your fixed rate period is ending and you're also carrying high-interest debts, this is the moment to refinance and consolidate in one move. You avoid break costs because your fixed term has expired, and you're already going through a refinance process, so the cost and effort of consolidating debts adds minimal extra work. Many Double Bay residents we speak with don't realise they can combine these two goals in a single application.

You can also use this opportunity to access equity for other purposes, whether that's funding renovations, buying an investment property, or clearing debts. The key is structuring the loan so each purpose is separated and treated appropriately for tax and repayment purposes. Consolidation doesn't have to mean a single lump of debt—it can mean a single lender and a single settlement process, with multiple loan splits serving different goals.

Call one of our team or book an appointment at a time that works for you. We'll review your current debts, run the numbers on what consolidation would cost versus what you'd save, and structure a refinance that improves your cashflow without extending your debt unnecessarily.

Frequently Asked Questions