03 9072 0200 Get started →

Loan options · Keep your home loan

Second mortgage business loans, step by step

Second mortgage business loans explained: borrow against equity while keeping your current home loan, who it suits, and three steps to sizing it safely.

Updated 2 October 2026 · 123 Business Finance editorial team

See if you qualify →No credit check to enquire
Family business owners planning around a kitchen table with a notebook and laptop

Quick answer

A second mortgage business loan is secured against a property that already has a first mortgage. The new lender sits behind your existing lender, so you keep your current home or property loan in place and borrow against the remaining equity. Second mortgages can fund business needs from $20,000 to $5,000,000 over residential or commercial property, and they're often used when refinancing the first loan would be costly, slow or unnecessary.

Key points

  • Sits behind your existing first mortgage
  • Keeps your current home or property loan untouched
  • $20,000 to $5,000,000 against residential or commercial property
  • Often used for tax debts, working capital and opportunities with a clear exit
Amounts
$20k – $5m
Position
Second ranking
First loan
Stays in place
Credit issues
Case by case

What is a second mortgage, in plain terms?

Picture a queue. Your bank, which lent you the money to buy your home or property, stands at the front. That’s the first mortgage. A second mortgage lender joins the queue behind it. If the property were ever sold, the first lender is repaid first, then the second.

For a business owner, the big benefit is that your existing loan doesn’t change. Same lender, same repayments, same features. The second mortgage is a separate loan, used for the business and secured by the equity that sits above your first mortgage.

Who uses second mortgage business loans?

They’re a good fit when three things are true:

  1. You own property with equity beyond the existing loan.
  2. You’d rather not disturb your first mortgage, because it’s well priced, has features you rely on, or breaking it would be costly.
  3. You have a clear business purpose and repayment plan.

Typical uses include clearing ATO debts, funding working capital, buying equipment or stock, consolidating expensive short-term business debts, and seizing time-limited opportunities.

Compared with… Second mortgage advantage Second mortgage trade-off
Refinancing the first loan First loan stays untouched Two loans to manage
Unsecured loan Larger amounts, more flexible on credit Property is on the line
Caveat loan More formal, can suit longer terms More documentation

How much can I borrow on a second mortgage?

Amounts run from $20,000 to $5,000,000 against residential or commercial property. To get a feel for your own position:

  • Start with a realistic value, not the most optimistic one. A valuation will settle it.
  • Subtract what you owe on the first mortgage.
  • Expect the lender to work within part of that equity, keeping a margin for safety.

Illustrative example only. An electrical contractor owns a home with a bank loan that’s roughly half its value. The business owes the ATO for two quarters of BAS and wants to clear it before it grows. A second mortgage behind the bank loan clears the debt in one go, leaving the home loan untouched. The plan is to repay the second mortgage from business income over an agreed term, then review.

Curious about your own equity? You can send a 60-second enquiry, and a real person will call. No credit check is needed to ask.

What will the lender need?

The list is familiar but a little longer than unsecured lending:

  • ID for every borrower, guarantor and property owner
  • Business details: ABN, structure, purpose of the funds
  • Property details: address, title, a recent rates notice
  • A current statement for the first mortgage, showing the balance and repayment history
  • A valuation, arranged through the lender
  • Business financials or bank statements, depending on the lender and amount
  • Signed loan and mortgage documents, usually after independent legal advice

What about ATO debt?

Tax debt is one of the most common reasons owners look at a second mortgage. It helps to know what the ATO itself offers first. Businesses that owe $200,000 or less can often set up a payment plan online. For larger debts, or where a plan isn’t workable, clearing the debt with property-secured finance can stop interest building and bring everything under one structured repayment. Our tax debt business loans page compares the options side by side.

What should I watch for?

  • Total cost of finance, including establishment, valuation, legal and any discharge fees
  • The term and what happens at the end of it
  • Early repayment conditions, if you might sell or refinance
  • Your first lender’s terms, since some require notice when a second mortgage is registered

Second mortgage or caveat?

Both sit behind an existing loan. A caveat loan is often set up more simply and suits shorter-term needs, while a registered second mortgage is more formal and can suit larger amounts or longer terms. The right one depends on how long you need the money and the lender’s requirements.

Who signs what on a second mortgage?

Because property and business are both involved, several people may need to sign documents. It helps to know in advance:

  • The borrower is usually the business, such as the company or trust, or the owner if they trade as a sole trader.
  • The property owners must all agree to the mortgage. If a home is jointly owned, both owners sign, even if only one is involved in the business.
  • Guarantors are often the directors, guaranteeing the business’s obligations personally.
  • Independent legal advice is commonly required, particularly for property owners or guarantors who don’t directly benefit from the loan.

This is especially important when a spouse or family member owns part of the property. Everyone should understand what they’re signing and the risk involved.

Raising these questions early avoids delays at the document stage. If you’d rather keep the family home out of it, the secured vs unsecured comparison explains the alternatives. And if your property has no existing loan, a first mortgage business loan may be the more natural structure.

Want to use your equity without touching your home loan?

A second mortgage can be an elegant solution: one new facility for the business, and your existing loan carries on exactly as before.

Here’s how we work. The enquiry takes about a minute and doesn’t involve a credit check. A real person reads it and calls you to talk it through; your details aren’t sent out to every lender in the market. Please be accurate about the property value, what’s owed on the first mortgage and the purpose of the funds, so the first call can get straight to a realistic option. See if you qualify.

The 1-2-3, in short

  1. 1

    Work out your usable equity

    Realistic property value, minus what's owed on the first mortgage. The second lender works within part of what's left.

  2. 2

    Decide: second mortgage or refinance?

    If your first loan is good and breaking it would cost money, a second mortgage often makes more sense.

  3. 3

    Line up the exit

    Know how it will be repaid: business income, a sale, or a refinance once the business is in a stronger position.

Frequently asked questions

Why choose a second mortgage instead of refinancing?

Refinancing replaces your existing loan, which may mean break costs, a fresh assessment by a bank and losing features you like. A second mortgage leaves the first loan alone and adds a separate business facility behind it.

Does my first mortgage lender need to agree?

Some first mortgage terms require notice or consent before another lender takes security. A specialist will help check your existing loan terms as part of the process.

Can I get a second mortgage with bad credit or an ATO debt?

Often, yes. Bad credit and ATO debt are considered case by case, and the property equity helps the lender look past issues that would block an unsecured application.

Is a second mortgage risky?

Any loan secured by property puts that property at risk if repayments aren't met. That's why sizing the loan sensibly and having a clear repayment plan matter so much.

See what your business could qualify for

One short enquiry, no credit check when you first enquire, and a real person who calls you back with options that fit.

No credit check to ask

One match, not a mailout

A real person on your file