Consolidating short-term debt into a mortgage cuts the interest rate sharply, but stretches the debt over up to 30 years. A card balance repaid over three years at a high rate can cost less than the same balance at a low rate over 30. Consolidation works when you keep repaying the old amount and close the accounts. Without both, it usually makes things worse.
The pitch is straightforward and genuinely appealing: replace several expensive debts with one cheap one, and reduce your monthly outgoings considerably. All of that is true. What it leaves out is the term, and the term is where the money goes.
Why the rate saving can be an illusion
Total interest depends on the rate and how long you pay it. Consolidation improves the first and usually makes the second much worse.
Consider a $30,000 debt. Repaid over four years at a high card rate, you pay a certain amount of interest. Roll it into a 30 year mortgage at a much lower rate and the annual interest falls dramatically — but you pay it for 30 years instead of four. The total frequently ends up higher, sometimes substantially, despite the far better rate.
You have also converted unsecured debt into debt secured against your home. A credit card default damages your credit file. A mortgage default can cost you the house. That is a real change in the nature of the risk, and it deserves more weight than it usually gets.
Model your own figures with the debt consolidation calculator — look at total interest, not the monthly figure.
The one condition that makes it work
Consolidation is genuinely effective under a specific discipline: keep making the same total repayment you were making before.
If you were paying $1,800 a month across a mortgage, two cards and a car loan, and consolidation reduces the required payment to $1,300, then paying $1,800 anyway directs $500 a month straight at principal. You keep the lower rate, you keep the same outgoing, and the debt clears faster than it otherwise would.
Done this way it is a good move. Done the other way — taking the $500 as relief — you have made a 30 year commitment in exchange for temporary breathing room.
Be honest about which one you are doing. Both are legitimate choices. Only one of them saves money, and it is worth knowing which you have chosen before rather than after.
Closing the accounts is not optional
The most common way consolidation fails: the cards are paid off, the limits stay open, and within two years the balances are back — on top of a mortgage that is now larger.
This is well documented and it is not a character flaw. A zero balance on an open card is an invitation, and the circumstances that produced the original balance rarely vanish on settlement day.
Close the accounts as part of the refinance, not afterwards. Most lenders will require it anyway for a consolidation, and will want evidence. If you find yourself resisting that condition, treat it as useful information about whether consolidation is the right answer.
When it genuinely is the right move
- The debt is expensive and the balance is meaningful. Card and personal loan rates are far above mortgage rates; the saving is real.
- You have enough equity to stay at or below 80% LVR afterwards, so LMI does not eat the benefit.
- The debt came from a one-off event — a medical bill, a car failure, a period out of work — rather than an ongoing pattern.
- You will maintain the old total repayment and close the accounts.
- Your income supports the new loan on the lender’s assessment, which includes their stress-test buffer.
When it is treating a symptom
Consolidation solves a rate problem. It does not solve a spending problem, and using it on one tends to end badly.
Warning signs worth taking seriously: this would be your second or third consolidation; you are using credit for ordinary living expenses; the balances rebuilt after the last time; or you are consolidating to make the monthly figure survivable rather than to reduce total cost.
If any of those apply, a free financial counsellor is a better first call than a broker. The National Debt Helpline is free, independent and confidential. That is a genuine recommendation, not a disclaimer — there is no version of this where borrowing more against your home fixes an underlying cash flow deficit.
The alternatives worth checking first
- A balance transfer to a zero or low interest card, if the balance can realistically be cleared within the promotional period. No new mortgage, no security over your home.
- Repricing your existing mortgage. Sometimes a lower rate on the home loan frees up enough cash flow to attack the other debts directly.
- A hardship arrangement with existing creditors, which is a legal right in Australia and does not involve borrowing more.
- Splitting the consolidated portion over a shorter term within the same loan. Some lenders allow this, and it preserves the low rate without the 30 year stretch. Ask specifically — it is the best of both and it is rarely offered unprompted.
More detail on the loan side is on the debt consolidation loans page.
Common questions
The refinance creates a credit enquiry, and closing accounts changes your credit mix, both of which can have a small short-term effect. Consistently meeting the new repayment matters far more over time than either.
It is difficult. Most lenders want you at or below 80% LVR after consolidating, and going above it usually triggers LMI that undermines the saving. Some lenders consider higher, with stricter conditions.
It saves interest per year and often costs more in total, because the debt runs for far longer. It saves money overall only if you keep repaying at the old total amount. Compare total interest, not the monthly repayment.
Usually yes for a consolidation, and they will often want evidence the accounts are closed rather than just paid to zero. This is a sensible condition rather than an obstacle.
If you can clear high-rate debt within a few years on your current income, doing so directly is almost always cheaper. Consolidation suits balances too large to clear quickly, where the rate difference is doing real work.