Quick answer
Using your house to fund your business can be sensible when the need is specific, the amount leaves a healthy cushion of equity, everyone on the title agrees, and there is a clear way to repay, such as a sale or refinance. It is usually a poor idea for covering ongoing losses, for small amounts an unsecured loan could handle, or when repayment depends on hope rather than a plan.
Key points
- Ask whether the need is specific and time-limited, or ongoing.
- Check the equity cushion left after borrowing, not just the maximum available.
- Name the exit (sale, refinance or cash flow) and a fallback before you borrow.
- Everyone on the title must agree, so they need the full picture.
- If two or more answers are shaky, look at alternatives first.
If you’re asking this question, you’re already doing better than many people who end up with a mortgage over their home for a business debt. The question deserves a proper answer rather than a sales pitch, so this page sets out how we’d think it through if it were our own house.
The short version: a house is a powerful source of business funding, and Australian small businesses lean on it heavily. In its October 2025 Bulletin, the Reserve Bank noted that having to provide residential property or other physical assets as collateral is a key challenge for small businesses trying to access finance. That tells you two things. Lenders like property as security, and owners often feel they have no other choice. Neither of those makes it the right choice for you.
What problem is the money actually solving?
Start with a sentence that begins “The business needs this money to…” and see how it ends. Good endings are specific and finish at a point in time:
- “…pay the ATO debt so we can refinance with our bank once the returns are lodged.”
- “…buy the business next door, which settles in eight weeks.”
- “…fund stock for the Christmas season, which sells through by February.”
- “…cover the gap until a large contract’s first progress payment arrives.”
Weaker endings are open-ended: “…keep things going,” “…get us through a rough patch,” “…cover wages until it picks up.” Those may still be real needs, but they describe an ongoing shortfall rather than a one-off. A loan secured on your house is a heavy tool for an ongoing shortfall, because nothing about the loan itself fixes the shortfall.
How much cushion will be left?
Lenders talk about loan-to-value ratio (LVR). For a second mortgage the number that matters is combined LVR: the first mortgage, anything else on the title, and the new loan, all divided by the property’s value. The higher it goes, the less equity is left as a cushion.
The cushion is what protects you. It’s what lets you refinance later, sell on your own timetable rather than a forced one, and absorb a valuation that comes in lower than you hoped. We’d much rather see someone borrow a smaller amount with a comfortable cushion than the maximum with almost none.
| Illustrative property | Value | Owed now | Amount needed | Combined LVR after | Cushion left |
|---|---|---|---|---|---|
| Family home, modest need | $1,000,000 | $450,000 | $150,000 | 60% | 40% |
| Family home, larger need | $1,000,000 | $450,000 | $300,000 | 75% | 25% |
| Family home, stretch | $1,000,000 | $600,000 | $250,000 | 85% | 15% |
Illustrative figures only. Real valuations, lender limits and pricing depend on your circumstances.
The first row leaves room to move. The second can work with a short, certain exit. The third leaves very little margin for anything going wrong and is usually the point to step back. You can test your own figures in the equity decision helper.
How will it be repaid, and what if that runs late?
A business-purpose second mortgage is normally a shorter-term arrangement. It should be repaid by something you can name:
- A sale of a property, a business, equipment or shares.
- A refinance into a longer-term loan once the reason you couldn’t get one has been fixed, such as overdue tax returns or an ATO arrangement.
- Trading cash flow, where the business genuinely has the monthly surplus to repay over an agreed period.
Then ask the uncomfortable follow-up: what happens if that exit takes twice as long, or brings in less? If the answer is a credible fallback, good. If the answer is “it won’t,” that’s worth sitting with. Our page on planning the exit from day one covers this in detail.
If you’ve read this far and your answers feel solid, it may be worth a conversation now. You can check whether you qualify in about a minute, and there’s no credit check at that stage.
Who else has a say?
If you own the house with a spouse, partner or anyone else, they must sign the mortgage. That makes it a household decision, not just a business one. The best outcomes we see come from owners who sit down with their co-owner before anyone fills in a form and walk through the purpose, the amount, the exit and the worst case. If the co-owner isn’t comfortable, that hesitation is useful information about the plan. See talking it through with a co-owner.
Is there a gentler option?
Before committing the house, it’s worth checking whether something with less at stake would do the job:
- Another property. If you own an investment property or your business premises with enough equity, using that instead keeps the family home off the table. See choosing which property to offer.
- Unsecured finance. For trading businesses needing roughly $5,000 to $500,000, an unsecured or cash-flow facility sized on turnover may suit, without a mortgage. See unsecured loans compared.
- A payment arrangement. For tax debts, an ATO payment plan may be worth comparing, though the general interest charge keeps compounding and is no longer tax deductible from 1 July 2025.
- Borrowing less. Sometimes half the amount, combined with a cost cut or an asset sale, solves the problem with far less risk.
business.gov.au’s guide to applying for a business loan makes a similar point: understand your income, expenses, debts and cash flow before you decide what you can afford and what security you’re prepared to offer.
A simple scorecard
Give yourself one point for each statement that’s honestly true:
- The need is specific and ends at a point in time.
- The amount leaves a comfortable equity cushion.
- The exit is named, dated and has a fallback.
- Everyone on the title understands and agrees.
- You’ve considered at least one alternative and can say why this is better.
Four or five points: a second mortgage may well be sensible. Two or three: there’s something to fix first. Zero or one: look at the alternatives before going further.
Talk it through before you decide
If the scorecard came out well, or if you’d simply like a second opinion from someone who’ll be straight with you, send a short enquiry. It takes about a minute, doesn’t involve a credit check, and goes to one specialist rather than being passed around a list of lenders. That person will look at your property, your purpose and your exit, and tell you plainly whether a second mortgage makes sense or whether something else would serve you better.
Please answer the form accurately, especially the property value, what’s owed, who’s on the title and how you plan to repay. Those details decide everything, and getting them right means the first call is the useful one.
Frequently asked questions
Is it ever a good idea to borrow against your home for a business?
Yes, when the money solves a defined problem or funds a defined opportunity, the amount is modest relative to the property's value, and there's a believable plan to repay it. Plenty of owners use home equity this way and come out fine. The trouble starts when the borrowing has no end date.
What's the biggest warning sign?
Borrowing to cover losses that haven't been fixed. If the business is spending more than it earns each month, property equity buys time but doesn't change the trend, and the loan becomes harder to repay the longer it runs.
Do I have to refinance my home loan to use the equity?
No. A second mortgage sits behind your existing loan and leaves it in place. That's often the reason owners choose it over a full refinance.
How much of my equity should I use?
As little as solves the problem. Leaving a generous cushion keeps your options open if a sale or refinance takes longer than planned. Our equity decision helper shows the cushion left at different amounts.
Can I use a different property instead of my home?
Often, yes. An investment property or commercial premises with enough equity can secure the loan instead, which keeps the family home out of it.