What Is a Second Mortgage, and How Much Can You Borrow Behind Your Bank?
A second mortgage lets you borrow against your equity without refinancing your first loan. Most private lenders go to about 70 to 75% combined LVR. Worked example inside.
A second mortgage is a loan secured against property that already has a first mortgage. A private lender will usually lend up to about 70 to 75% of the property value across both loans combined, so your borrowing room is that cap minus what you already owe.
It is the quiet workhorse of private lending. Used well, it releases equity without disturbing a cheap first loan. Here is how it works and what it costs you in structure, not rate.
How does a second mortgage work?
Your bank keeps its first mortgage and stays first in line. The private lender registers a second mortgage behind it, and sits second in line if the property is ever sold. You keep your original loan untouched.
Because the second lender ranks behind the bank, the risk is higher, so the terms reflect that. The trade is simple: you avoid refinancing, break costs and losing a good first-loan rate, in exchange for a smaller, shorter top-up loan.
How much can you borrow on a second mortgage?
Take the lender's combined loan-to-value cap, usually around 70 to 75%, multiply by the property value, then subtract your existing first mortgage. What is left is roughly what you can borrow.
The maths on a $2,400,000 property with a $1,000,000 bank loan, at a 70% combined cap:
- Property value: $2,400,000
- Combined cap at 70%: $1,680,000
- Less existing first mortgage: $1,000,000
- Room for a second mortgage: $680,000
Illustrative example. Figures are indicative and do not represent an actual client.
Why does the security you choose change how much you get?
Because it is the combined position that matters, not the loan on its own. A property that is already heavily geared leaves almost no room, even if it is valuable.
Say a client wanted $600,000 and first offered a property worth $1,600,000 with $1,150,000 already owing. That is already about 72% geared, so to a 75% cap there was only around $50,000 left. Nowhere near enough. Moving the second mortgage to a property with more equity solved it in one step. Same borrower, same funds, different security. Where the mortgage sits is often the whole deal.
When does a second mortgage beat refinancing?
When your first mortgage is cheap, when refinancing triggers break costs, or when you only need funds for a short time. A second mortgage tops up the equity without unwinding the loan you want to keep.
If you would lose a low first-loan rate by refinancing, a second mortgage is usually the smarter path, even though the top-up itself is priced higher.
Broker takeaway
If your client needs equity but has a first loan worth keeping, look at a second mortgage before a full refinance. Send us the property value and the current debt, and we will tell you the room straight away. Our minimum is $500,000.
Vía Private is an Australian non-bank private credit lender providing property-secured commercial loans, including second mortgages, to companies and trusts for business and investment purposes across NSW, VIC, QLD and the ACT. All lending is subject to credit approval and valuation. General information only, not financial or credit advice.
Frequently asked questions
Does my bank have to agree to a second mortgage?
Often yes. The first mortgagee usually signs a deed of priority that sets out how the two lenders rank. That step can add a few days.
What is the minimum second mortgage?
At Vía Private the minimum second mortgage is $500,000.
What happens to a second mortgage if the property is sold?
The first mortgage is repaid first from the sale proceeds, then the second mortgage, then any surplus goes to the owner.
Is a second mortgage the same as a caveat loan?
No. A second mortgage is registered on title and ranks behind the first mortgage. A caveat only records an interest and does not give the same security, so terms differ.