What Is a Second Mortgage, and How Much Can Your Client Borrow Behind Their Bank?

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 the borrowing room is that cap minus what is already owed.

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 in structure, not rate.

How does a second mortgage work?

The client's 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. Your client keeps their 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 your client 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 the existing first mortgage. What is left is roughly what your client 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

Where that headroom gets tight is where this stops being arithmetic, and Cammeray works through both a scenario that fits and one we would decline. Vaucluse is the same sum at a value where a two or three per cent difference of opinion on the valuation is a lot of money.

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 the client's first mortgage is cheap, when refinancing triggers break costs, or when they only need funds for a short time. A second mortgage tops up the equity without unwinding the loan they want to keep.

If your client 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. This article receives a lot of traffic from our Sydney suburb pages, which run the same sum on thirty different sets of local numbers.

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.