Debt consolidation is the most double-edged move in home lending. Done with a plan, it genuinely simplifies life and saves real money. Done on autopilot, it converts short, expensive debts into long, quiet ones - and the total cost can end up higher than the mess it replaced. Here's the full maths, both directions, with no shame attached: most consolidations start from perfectly normal life events.
The appeal, in one worked example
Illustrative figures, stated assumptions, your numbers will differ. Say you're carrying $30,000 outside your mortgage: a $15,000 credit card around 20% p.a. and a $15,000 personal loan around 12% over five years. Together they might be costing roughly $700 a month.
Roll both into a home loan at an illustrative 6.0% and the repayment on that $30,000 becomes about $193 a month over 25 years. Monthly pressure drops by around $500 - that's the number the ads sell, and the relief is real.
The catch, in the same example
Look at the same $30,000 over time. Paid off at $193 a month for 25 years, it costs roughly $28,000 in interest - on debts that might have cost a fraction of that over their original short lives. A cheap rate over a long time can beat an expensive rate over a short time. That's the catch, and any honest consolidation conversation starts with it.
The fix: consolidate the rate, not the timeline
Here's the version I actually recommend when it fits: consolidate, then keep paying roughly what you were paying before. In the example, keep the ~$700 going toward that $30,000 slice and it clears in about four years, with total interest under $4,000. Same consolidation, roughly $24,000 difference - all behaviour, no product. Practical ways to lock the behaviour in: a separate loan split for the consolidated amount so it stays visible, extra repayments automated on day one, and the freed-up cards closed or cut right down (a limit you keep is a relapse waiting politely).
What lenders look at
You'll need enough equity (the consolidated loan generally stays under 80% of your home's value to avoid Lenders Mortgage Insurance) and the income to service the new total. Lenders also read the story: a car loan and a renovation card read differently to six months of growing card balances. Different lenders draw these lines in very different places - which is where comparing across 40+ of them earns its keep.
The honest bit
If your repayments are currently manageable and the goal is efficiency, consolidation done with the fix above is a genuinely strong move. If you're already behind and the goal is survival, consolidation can make things worse by converting recoverable stumbles into debt secured against your home - talk to your lender's hardship team or the National Debt Helpline (1800 007 007, free and independent) first. And if you're somewhere in between, that's exactly what an obligation-free conversation is for: I'll show you the 25-year cost and the 4-year cost side by side, and you choose with open eyes.
Quick answers
Is it a good idea to roll credit cards into a mortgage?
It can be - swapping roughly 20% interest for a home-loan rate is powerful. The catch is time: stretch that card debt over 25-30 years at minimum repayments and the total interest can exceed what the card would have cost. The move works when you consolidate AND keep repayments near their old level so the debt clears in years, not decades.
What debts can be consolidated into a home loan?
Commonly credit cards, personal loans and car loans. Lenders differ on how many debts, what proportion of the new loan can be consolidation, and how they view the story behind the debts. Enough equity in your home and the income to service the new loan are the entry requirements.
What if I'm struggling to keep up with repayments right now?
Then please treat this article as background, not a plan. Contact your lender's hardship team (every lender has one, and asking doesn't hurt your credit score), or call the National Debt Helpline on 1800 007 007 - a free, independent financial counselling service. Consolidation is a tool for reorganising manageable debt, not a fix for unmanageable debt.
Want this modelled on your real numbers, judgement-free? Start your obligation-free enquiry → or call Michael on 0477 979 377.
More on debt consolidation
Reviewed and updated 4 July 2026. Rates, fees, schemes and lender policies change over time - always confirm current details. Examples on this page use clearly labelled illustrative figures, not current market rates.
Michael Gross is a Credit Representative (546597) of LMG Broker Services Pty Ltd (ACN 632 405 504, Australian Credit Licence 517192). The information on this page is general in nature and doesn't take into account your personal objectives, financial situation or needs - consider whether it's appropriate for your circumstances before acting on it.
Want the consolidation maths run on your actual debts?
I'll model it honestly - including the version where consolidating isn't your best move.