Refinance a second mortgage into your home loan, or pay it out another way?

Ask most owners how they’ll repay a business second mortgage and you’ll hear the same answer: “We’ll refinance it into the home loan once things settle down.” It’s a perfectly good plan. It’s also two decisions bundled into one sentence. The first is whether a refinance is the right exit. The second is where the debt should land. This guide pulls them apart.

Is refinancing really the best way out of a second mortgage?

Sometimes. A refinance is one of three main exits, alongside a sale and paying the loan down from trading cash flow. Our exit plan guide covers all three. A refinance tends to be the right one when:

• the second mortgage solved a temporary obstacle, such as unlodged returns or an ATO debt, that has now been fixed;
• the amount is too large to clear from cash flow within the loan’s term;
• there’s no asset you’d sensibly sell; and
• the household can comfortably afford the larger home loan on today’s income, not next year’s.

If one of those isn’t true, a refinance can turn a short, defined business loan into a long, vague family debt. That’s the outcome to avoid.

What will a bank test before it refinances?

A refinance exit only works if a new lender says yes. So the useful question isn’t “will rates be better?” but “what will the bank look at, and is it ready?”

business.gov.au’s guide to applying for a business loan says lenders look at your financial position, including “income, expenses, debts, and cash flow”, and at whether you can repay. For a home loan that’s absorbing business debt, expect them to look at all of it:

1. Lodged tax returns and BAS. Usually the first thing a bank asks for, and often the reason the second mortgage existed.
2. A clean ATO position. A cleared debt, or a payment arrangement that’s on track and documented.
3. Trading that supports the debt. Several months of bank statements showing the business recovered, not just survived.
4. The purpose of the original loan. Banks will ask why there was a second mortgage. A tidy one-page explanation helps.
5. Serviceability with a buffer. APRA lists the mortgage serviceability buffer as unchanged at 3 per cent in its November 2025 announcement. Banks test whether you could still meet repayments at the loan rate plus that buffer, so your real repayments sit comfortably below the level they test against.

Does APRA’s new debt-to-income limit matter here?

It can. From 1 February 2026, APRA allows banks to write no more than 20 per cent of new mortgage lending at a debt-to-income ratio of six times or more, measured separately for owner-occupier and investor loans. APRA said the limit wasn’t binding across the system when it was announced, and it doesn’t ban any individual loan.

But think about what a refinance does to your ratio. Debt-to-income compares all your debt with your gross income. Folding a business second mortgage into the home loan adds it to the household’s total in one move. A family on $160,000 with a $600,000 home loan sits at about 3.75 times. Add a $350,000 business debt and it’s about 5.9 times, close to the line banks are watching. You don’t have to avoid that zone, but expect closer questions and plan for a “not yet”.

If you’re unsure where you’d land, tell us the numbers and a specialist will look at whether a refinance is realistic yet. Asking doesn’t touch your credit file.

Should business debt end up inside the family home loan?

This is the real decision, and there’s no single answer. Here are the trade-offs laid out plainly:

Folding it into the home loan	Keeping it separate (or clearing it another way)
One loan, one repayment, often cheaper per year	Two loans until the business one is paid out
Easy to let a 12-month debt run for 25–30 years	The business debt has its own end date
Business and family borrowing blur together	The purpose stays obvious to you and your accountant
Breaking a fixed home loan can carry break costs	Your current home loan and its features stay untouched
One lender holds everything	Spreads your options if one lender tightens up

The 30-year trap. Spreading a business debt over a full home loan term lowers the monthly figure, but the debt then lives for decades and you pay interest on it the whole time. If you do roll it in, set a payoff date for the business portion that matches the original plan (two or three years, say) and make extra repayments to hit it.

The tax trail. The ATO’s ruling on redraw and line-of-credit facilities, TR 2000/2, reflects a general principle: interest deductibility follows what the borrowed money was used for, not which property secures it. A refinance that pays out a genuine business borrowing doesn’t automatically lose that character, but mixing it into one private loan makes the records harder to follow. The simple fix is a separate split for the business portion, set up at settlement. Our list of questions for your accountant has more to raise before you sign. If you’ve already redrawn on the home loan for the business, our redraw and offset guide explains why that already makes the picture messier.

What are the other ways to pay out a business second mortgage?

Before you assume a refinance, line it up against the alternatives. Often the best exit is a mix.

Exit	Suits	Watch for
Pay down from cash flow	Smaller balances, or a business whose surplus has proven steady	One soft quarter undoing the plan
Partial paydown, then refinance the rest	Owners who can clear a chunk but not all of it	Being clear which part relies on which source
Unsecured business loan	Trading businesses with solid statements that would rather take the home out of it	Loan size is set by turnover, not equity. See our unsecured loan comparison
Sell an asset	An investment property, equipment or shares you’d planned to sell anyway	Campaigns running long. Our downsizing guide covers sale exits in detail
Refinance the second mortgage only	Needing a few more months to qualify with a bank, for a clear reason	Paying set-up costs twice to buy time. Only worth it with a firm date for the fix
Refinance everything into one home loan	Long-term needs, an affordable combined loan, a clean application	The 30-year trap and break costs on a fixed loan

The paperwork side of paying out a second mortgage (the discharge, the payout figure) is routine and handled at settlement. It’s the choice of exit that deserves your attention.

When should you start the refinance conversation?

Earlier than feels necessary. A refinance that starts in the last few weeks of a second mortgage term is a refinance under pressure, and a bank’s “not yet” leaves you with nowhere to go. A sensible rhythm:

• At settlement of the second mortgage: write down what has to be true for a bank to say yes, with a date against each item.
• Around the halfway mark: check those items. Returns lodged? ATO clear? Trading steady? If something’s slipping, start on the fallback now.
• With a few months to run: have a broker or your bank give a candid early read on the application before you formally lodge.
• If the answer is “not yet”: talk to your second mortgage lender before the term ends. As our page on what happens if things go wrong explains, options are wider before a deadline than after it.

The exit plan checklist has a refinance route that turns these into tick-boxes you can share with whoever’s on the title.

A worked example: three ways out of the same loan

Illustrative only, round numbers.

A plumbing business owner and their partner own a home worth about $1,200,000, with $480,000 left on the home loan, fixed for another 14 months. A year ago they took a $200,000 business second mortgage to clear an ATO debt while two years of returns were brought up to date. Combined debt was $680,000, about 57% of the property’s value, comfortably inside a 70% combined-LVR band, which would allow about $840,000. That left a cushion of roughly $160,000.

Now the returns are lodged, the ATO account is clear and the business has paid down $50,000 from trading. Household income is about $190,000.

• Option A: refinance everything now. Break the fixed home loan, roll the remaining $150,000 into one $630,000 loan. Debt-to-income is about 3.3 times, comfortable. Downside: break costs on the fixed loan, and the business debt now runs on a 30-year clock unless they set their own payoff date.
• Option B: pay down, then refinance later. Keep paying the second mortgage from trading for another 14 months, then refinance whatever’s left into a separate split when the fixed period ends. No break costs, and the business portion keeps a short horizon. Downside: two loans for longer, and it relies on trading staying steady.
• Option C: move the business debt off the house. With two clean years of returns, the business may now qualify for an unsecured facility to pay out the remaining $150,000. The family home ends up with just the home loan. Downside: sized on turnover, so it may not cover the full amount.

For this couple, Option B with Option C as a fallback is probably the calmest path. Their situation isn’t yours, though. Our equity decision helper lets you check your own combined-LVR and cushion figures.

Planning your way out? Let’s look at it together

The best time to think about getting out of a second mortgage is before you’re in one. The second best is now, while there’s still time on the clock. Whether you’re weighing up a business second mortgage with a refinance exit already in mind, or you’re partway through one and wondering whether the home loan is the right place for it to land, we’re happy to talk it through. That includes saying when a refinance isn’t the sensible answer and something else is.

The enquiry takes about a minute, and your credit file isn’t looked at just for asking. Nothing is checked unless you decide to go ahead. Your details go to one specialist and aren’t passed around to multiple lenders, so you won’t be fielding calls from strangers. A real person reads your situation and calls you back.

Please fill in the form accurately: the property’s value, what’s owing on each loan (including any fixed period), who’s on the title, how much the business needs or still owes, what it was for, and how you expect to repay it. Business purposes only.

Map out my exit with a specialist →