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Private second mortgage for your business, behind your existing loan

Private second mortgage business loans let you borrow against equity behind your existing home loan without refinancing it. How they work after a decline.

Updated 18 October 2026 · Alternative Business Funding editorial team

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Quick answer

A private second mortgage lets your business borrow against the equity in a property that already has a first mortgage, without refinancing or disturbing that loan. The private lender ranks behind your existing lender. It's often used after a bank declines to lend more, to clear tax debt, consolidate short-term debts or fund a business need. Property-secured loans range from $20,000 to $5,000,000.

Key points

  • Leaves your existing home or property loan untouched
  • Uses equity behind the first mortgage
  • Common after a bank won't lend more
  • Your existing lender may need to be notified or consent
Ranks
Behind your existing first mortgage
Amount
Within $20k to $5m, depending on equity
Good for
ATO debt, consolidation, business needs

Why a second mortgage is often the simplest answer

Here’s a situation we see constantly. A business owner has a home loan with a bank, on decent terms, with plenty of equity built up. The business needs funds. The bank says no, perhaps because of the latest tax return, a tax debt or a credit listing.

Refinancing the entire home loan to a private lender would be expensive and unnecessary. A private second mortgage solves it differently: it leaves the existing home loan exactly as it is and borrows against the equity sitting behind it.

How it works

  1. The private lender assesses the property, the existing loan and the equity remaining.
  2. It lends to your business, and registers a second mortgage behind your existing lender.
  3. Your existing loan keeps running as normal, with its own repayments.
  4. The second mortgage is repaid according to its terms, often at the end of a set period through a refinance, sale or other exit.

If the property were ever sold, the first lender is repaid first, then the second.

When does a second mortgage make sense?

Situation Why a second mortgage fits
Bank won’t increase your home loan Leaves the good first loan untouched
ATO debt to clear Funds paid directly to the ATO
Several short-term debts to consolidate One structure replaces many repayments
Opportunity with a deadline Can be quicker than refinancing everything
You’ll refinance properly later Short-term bridge until the issue clears

It suits people who have meaningful equity and a clear exit. Our page on loans with ATO debt shows how second mortgages are often used to clear a tax balance.

What lenders want to know

  • Property details: address, type and a rough idea of what it’s worth.
  • First mortgage details: lender, balance, repayments and whether it’s up to date.
  • Ownership: whose names are on the title, and whether every owner agrees.
  • Purpose: exactly what the funds are for.
  • Exit: how the second mortgage will be repaid.
  • Your story: what led to the bank decline.

Arrears on the first mortgage make things much harder, so be upfront if there are any. Some second-mortgage lenders can help clear arrears as part of the loan, but they need to know.

Many first mortgage contracts say the borrower must notify, or get consent from, the first lender before another mortgage is registered. Some private lenders use a caveat instead of a registered second mortgage for shorter terms; see our page on caveat loans. Your lender and lawyer will confirm what applies to your property.

Costs and terms

Second mortgages usually cost more than first mortgages, because the lender ranks behind someone else. Terms are often shorter. Every loan is priced individually, which is why we don’t publish rates. You should be shown the total cost in dollars, including fees, before committing, and you should weigh it against the cost of the problem you’re solving, such as ATO interest and penalties or the price of a missed opportunity.

Have equity behind your home loan? Tell us what you need it for.

First or second?

If your existing home loan is expiring, in arrears, or your bank won’t allow a second-ranking security, a private first mortgage that refinances everything may be cleaner. If your existing loan is fine, a second mortgage usually keeps things simpler.

Illustrative example: A plumber with a home loan of about half his home’s worth was declined by his bank for funds to pay an ATO debt and buy a second work van. A private second mortgage provided both, paid directly to the ATO and the van dealer, while his home loan continued unchanged. He planned to refinance both loans together once his next two returns were lodged.

How lenders work out what equity is available

For a second mortgage, the figure that matters is the combined debt across both loans compared with what the property is realistically worth. A simple way to think about it:

Item Illustrative figure
Realistic property worth $1,000,000
Existing first mortgage balance $450,000
Equity before any new loan $550,000
Lender’s maximum combined lending (example only) Varies by lender and property
Possible second mortgage Whatever fits within that combined limit, after buffers

These figures are illustrative only. Each lender sets its own limits, and unusual or regional properties usually attract more conservative amounts. The point is that the second mortgage lender is looking at the total exposure, not just its own loan.

Keeping the first loan healthy

A second mortgage depends on the first loan staying in good order. If the first mortgage falls into arrears, the first lender’s rights come ahead of the second lender’s, and the whole arrangement comes under pressure. While a second mortgage is in place:

  • keep first mortgage repayments up to date,
  • don’t redraw or increase the first loan without checking the effect,
  • tell both lenders promptly if anything changes,
  • plan the exit for the second mortgage from day one.

Let’s look at the equity you’ve built

Your home loan may already be holding the answer. There’s no credit check when you send us an enquiry, and we don’t spread your details across a set of lenders. A real person reads your situation and calls you. Please include your current loan balance and lender and a rough property value, so we can tell you quickly whether a second mortgage fits. Start your enquiry.

Frequently asked questions

Do I need my first mortgage lender's permission?

It depends on your existing loan terms. Some first mortgages require consent or notice before a second mortgage is registered. Your second-mortgage lender will usually tell you what's needed.

Is a second mortgage riskier than a first mortgage?

For the lender, yes, because it ranks second. That's partly why second mortgages cost more. For you, the main risk is the same: the property is security for the debt.

How much can I borrow on a second mortgage?

It depends on the equity left after your first mortgage, the property type and the lender's limits. The combined debt across both mortgages is what matters most.

Can I get a second mortgage with bad credit?

Often, yes. Private second-mortgage lenders focus mainly on the equity and the exit plan, and consider credit history case by case.

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