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Rolling debts into your mortgage in Australia
What consolidating cards and personal loans into a home loan really costs over 30 years, the split-term fix that avoids it, and the conditions lenders attach.
What consolidation changes, and what it does not
Refinancing unsecured debts — credit cards, personal loans, car loans, sometimes tax debt — into a home loan secured against your property. The monthly outflow usually falls sharply, because a 6% secured rate over a long term costs far less per month than a 21% card rate. What does not change is the amount you owe. What does change is that your home now stands behind debts that previously did not touch it.
The trade is time for cashflow, and the numbers are stark. A $30,000 credit card balance at 20.99% cleared over three years costs about $1,130 a month and roughly $10,700 in interest. The same $30,000 folded into a 30-year home loan at 6.09% costs about $182 a month and roughly $35,400 in interest if it is never paid down early. You save $948 a month and treble the lifetime cost.
The fix: consolidate, then amortise separately
The way to keep the cashflow relief without the lifetime cost is to put the consolidated amount into its own loan account over a short term instead of blending it into the 30-year balance. That same $30,000 as a five-year split at 6.09% costs about $581 a month and roughly $4,900 in interest — cheaper in both dimensions than either the credit card or the 30-year blend.
Not every lender offers a split on refinance and a few charge per additional account, but most will set one up if you ask at application rather than afterwards. Where a split is not available, the alternative is to keep paying the old repayment into the larger loan and clear the consolidated portion within the same window. That takes discipline the split does not require.
What the lender will ask for and impose
Consolidation is a form of cash-out, so it attracts more scrutiny than a straight rate switch. Expect to supply around six months of statements for every debt being paid out, and for the funds to be paid directly to those creditors at settlement rather than into your account. Most lenders require credit cards being consolidated to be closed rather than merely zeroed, and will ask for evidence of closure afterwards.
Conduct on those statements matters more than the balances. Missed minimums, dishonours, gambling transactions and payday lending change the answer at many lenders regardless of income. Buy-now-pay-later commitments are treated as ongoing expenses by most lenders and as liabilities by some, so disclose them — they appear in your bank statements whether you list them or not.
Serviceability up, debt-to-income unchanged
Consolidation usually improves serviceability, because lenders assess a credit card at roughly 3.8% of its limit each month — $1,140 on a $30,000 limit — while the same balance inside a home loan is assessed at your rate plus the 3 percentage point buffer. Closing the card removes the limit-based assessment altogether, which is exactly why the lender insists on closure rather than a zero balance.
Debt-to-income works the other way. Since 1 February 2026 APRA has limited each lender to writing no more than 20% of its new owner-occupier lending and 20% of its new investor lending at a DTI of six times or above, measured separately. That is a portfolio cap on the bank, not a ban on the borrower — lenders do write above six times within quota. Consolidating leaves your total debt unchanged, so your DTI is unchanged; what changes is which lenders have room.
When not to consolidate
Three signals argue against it. If the debt came from a spending pattern that has not changed, the cards clear and then refill — the most common outcome, and now with a larger mortgage alongside them. If you are likely to sell within a few years, you pay the setup costs without the long-run benefit. If the unsecured balance is small, the refinance fees can exceed the saving outright.
And if repayments are already unaffordable rather than merely uncomfortable, consolidation is the wrong tool. Regulated Australian lenders have hardship processes, and free financial counselling is available through the National Debt Helpline. A refinance taken to survive the next three months, at a bigger balance over a longer term, usually makes the twelfth month worse.
Investors, tax debt and mixed purposes
Two complications deserve naming. Consolidating personal debt into an investment loan mixes deductible and non-deductible purposes in one account, and the interest then has to be apportioned — messy, and something accountants charge to unpick. Keep personal consolidation in a separate account against owner-occupied security where the lender allows it. Investors should also note that from 1 July 2027, under legislation given Royal Assent on 26 June 2026, losses on established residential property acquired after 12 May 2026 will be quarantined rather than offset against other income.
ATO tax debt can sometimes be consolidated, but the panel narrows and most lenders want evidence the debt is not part of a pattern. Consolidation is one of the few decisions where the wrong structure costs more than the wrong rate, so Azure Home Loans models the split against the blend before anything is lodged. This is education for Australian readers, not tax or credit advice.
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FAQ
Is it a good idea to consolidate debt into a home loan?
It depends entirely on the term you use. Folding $30,000 of card debt into a 30-year mortgage cuts the monthly cost from about $1,130 to about $182 but lifts total interest from roughly $10,700 to roughly $35,400. Consolidating into a five-year split at the same rate costs about $581 a month and roughly $4,900 in interest, which beats both.
Do I have to close my credit cards to consolidate?
Usually yes for the cards being paid out. Most Australian lenders require closure rather than a zero balance, because serviceability is assessed on the credit limit — commonly around 3.8% of it each month — not the balance. Some lenders will allow one card to be retained at a reduced limit. Expect to provide evidence of closure after settlement.
How much does a credit card limit reduce my borrowing power?
Commonly $40,000 to $50,000 of home loan capacity per $10,000 of limit at current assessment rates, so a $30,000 card can cost well over $100,000. Lenders assess cards on the limit regardless of the balance, which means an unused card costs the same capacity as a fully drawn one. Reducing or closing limits before applying is often the fastest fix available.
Can I consolidate a car loan into my mortgage?
Often yes, if your loan-to-value ratio allows it and the lender accepts the purpose. The trade is the same as with cards: a three-year car loan becomes a much smaller payment over a much longer term. Keep the car five years and the debt thirty and you are financing a depreciating asset well past its life. A split term avoids that.
Does consolidating debt hurt my credit score?
Modestly in the short term. The refinance records a credit enquiry and closing accounts removes some account age from your file. Over the following months the effect is usually positive, because revolving balances fall to zero and repayment history stays clean. What genuinely damages a file is consolidating and then rebuilding the card balances alongside the larger mortgage.
Can I consolidate ATO tax debt into a home loan?
Sometimes, but the lender panel is much narrower and terms are tighter. Lenders want to see the debt is not recurring, that lodgements are current, and often that a payment arrangement was maintained without default. Tax debts above certain thresholds can be reported to credit bureaux, so it may already be visible on your file. Treat it as a specialist application.
Will consolidating debt lower my debt-to-income ratio?
No. Total debt and total income are both unchanged, so the ratio is unchanged. What changes is which lenders can write the loan, because APRA has capped each lender since 1 February 2026 at a fifth of new owner-occupier lending and a fifth of new investor lending at six times income or above. That limits the bank’s book, not you individually.
Is a personal loan cheaper than adding debt to my mortgage?
It can be, because on small balances term beats rate. Twenty thousand dollars over four years at 11% costs about $517 a month and roughly $4,800 in interest. The same $20,000 over 30 years at 6.09% costs about $121 a month and roughly $23,600 in interest. Compare total interest over the term you will genuinely take, not the headline rates.