A $30,000 pile of credit card and personal-loan debt at a blended 17 per cent is bleeding you roughly $5,100 a year in interest before you touch the principal. With the RBA cash rate held at 4.35 per cent this June and card rates from CBA, Westpac, NAB and ANZ still parked near 20 per cent, that bleed is not getting cheaper on its own. Consolidation is the obvious lever, and for a lot of households it is the right one. The trap is that the most common version of it can quietly cost you more in total, even while it makes the monthly number look great.
The move everyone makes, and the maths it hides
The default play is to roll unsecured debt into the home loan. It works because a mortgage at 6.3 per cent is a fraction of a card at 20 per cent, and lenders love it because it parks more debt against your property. The monthly relief is real. The hidden cost is the term. You are trading a high rate over a short horizon for a low rate over a much longer one, and over 25 years even a low rate compounds into a big number.
Run the $30,000. Paid as a dedicated facility over four years at a blended 17 per cent, the repayment is about $868 a month and you pay roughly $11,700 in total interest, then you are done. Add that same $30,000 to a 25-year mortgage at 6.3 per cent and the extra repayment is only about $199 a month. Your cash flow improves by nearly $670 a month. But stretched over 25 years, the interest on that $30,000 chunk comes to around $29,700, more than double, and close to the original sum again.
- Dedicated 4-year facility at 17 per cent: about $868 a month, around $11,700 total interest, cleared in 48 months.
- $30,000 added to a 25-year mortgage at 6.3 per cent: about $199 a month, around $29,700 total interest, cleared in 300 months.
- The mortgage route frees up about $669 a month now, but costs roughly $18,000 more in interest if you ride it out for the full term.
There is also a structural risk the maths does not show. You have just secured previously unsecured debt against your home. Miss enough payments on a credit card and the worst case is a default and a debt collector. Miss enough on a mortgage and the worst case is the house. That is not a reason to never consolidate, but it is a reason to be honest about what you are doing.
When consolidation genuinely wins
There are real wins here, and I am not going to pretend otherwise. One payment instead of five removes the missed-payment fees and the mental load, a lower rate cuts the interest cost per dollar of debt, and a structured loan with a fixed end date breaks the minimum-payment trap where paying the minimum on a card can keep you in debt for over a decade while the balance barely moves. The single move that converts consolidation from a cash-flow band-aid into an actual payoff is this: keep paying the OLD higher amount into the new lower-rate facility. If you were servicing $868 a month across the cards and you refinance into a mortgage payment of $199, redirect the other $669 straight at the loan as extra repayments. Now you get the low rate AND a short term, and you clear the debt years early instead of dragging it across a quarter of a century.
The alternatives, told straight
- A dedicated debt-consolidation personal loan over a fixed short term (3 to 5 years) at 8 to 14 per cent. You keep a low-ish rate AND a hard end date, so you cannot accidentally stretch the debt to 25 years. This is the cleanest option for most people who can service it.
- A balance-transfer credit card for disciplined payers only. A 0 per cent intro period can wipe the interest entirely, but if you do not clear the balance before it ends, the revert rate near 20 per cent and the transfer fee can leave you worse off. This is a tool for people who will actually pay it down on a schedule, not for people who need a longer leash.
- A free financial counsellor before any new lending if you are in genuine hardship. The National Debt Helpline (1800 007 007) is free, independent and not selling you anything. New debt is not the answer to unmanageable debt, and a counsellor can sit beside you in a hardship conversation with the lender.
And the part nobody wants to hear: consolidation does nothing about the behaviour that built the balance. If you clear $30,000 of cards and leave the cards open, the most common outcome I see is that within eighteen months the cards are full again AND you are carrying the consolidated loan on top, so now you have more debt than you started with. The facility did not fail, the plan did. So here is what you should do. Consolidation is a cash-flow tool, not a cure. Only pull the trigger if you will do two things and mean them. One: cut up or freeze the cleared cards so the limit cannot refill. Two: keep paying the old higher amount into the new lower-rate facility so the low rate actually shortens the payoff instead of stretching it. Do both and consolidation works. Do neither and you have just moved the problem somewhere more expensive, possibly against your house.
Disclosure: Your Finance Guide is an education publisher, not a credit provider or financial counselling service. We partner with Australian Lending and Investment Centre (ALG) ACL 505575 for broker matching, and ALG receives lender commissions on loans that settle. That does not change the maths above, and if you are in genuine hardship the free, independent National Debt Helpline (1800 007 007) should be your first call, not us.