First mortgage or second mortgage for a business loan?

The basic difference

When you borrow against property, the order in which lenders are registered on the title determines who is repaid first if the property is sold. A first mortgage ranks first. A second mortgage ranks behind it. For a business owner, the practical question is whether to replace the existing loan with a new first mortgage that includes the extra funds, or to leave the existing loan alone and add a second mortgage behind it.

Neither is always better. Each suits different circumstances, and the right answer usually becomes clear once a few facts are on the table.

When a first mortgage makes more sense

• There is no existing mortgage. An unencumbered property can secure a first mortgage straight away. See first mortgage loans.
• The existing loan is expensive or expiring. If the current lender is charging too much, wants to be repaid or will not extend, replacing it achieves two goals at once.
• The amount is large. A single first mortgage usually supports more borrowing than a second mortgage behind someone else.
• The existing lender will not cooperate. If consent for a second mortgage is unavailable, refinancing removes the obstacle.
• Simplicity matters. One lender, one loan and one discharge at the end.

When a second mortgage makes more sense

• The existing loan is good value. A competitive rate or fixed term you do not want to break.
• The need is moderate and temporary. A tax bill, a deposit, a stock purchase or a cash flow gap that will be repaid within months.
• Break costs would be high. Fixed-rate loans can carry significant costs to repay early.
• Speed matters and consent is easy. Only the new loan needs to be documented. See second mortgage loans.

How the numbers compare

Illustrative only. Consider a commercial property worth $1,600,000 with an existing bank loan of $700,000 on attractive terms, fixed for another two years. The business needs $300,000 for twelve months.

	Option A: second mortgage	Option B: first mortgage refinance
New lending	$300,000 behind the bank	About $1,000,000 replacing the bank
Existing loan	Unchanged	Repaid; possible break costs
Combined LVR	About 63%	About 63%
Documentation	New loan only	Whole debt
Cost focus	Pricing on $300,000 for 12 months	Pricing on $1,000,000 plus break costs

In this example the second mortgage is likely to be the cheaper and simpler path, because the bank loan is good value and the need is small and temporary. If instead the bank loan were expiring and the business needed funds for several years, the first mortgage refinance might be better. Use the second mortgage headroom calculator and the LVR calculator to test your own figures.

Consent and cooperation

Many first mortgage contracts require the borrower to obtain consent before granting a second mortgage, or at least to give notice. Some lenders consent quickly; others take weeks or decline. Where consent is slow, a caveat can bridge the gap and later be converted to a registered second mortgage. Where consent is refused, a first mortgage refinance may be the only practical route.

Find out which structure suits your property with a quick enquiry.

LVR differences

With a first mortgage, the LVR is simply the new loan divided by the property value. With a second mortgage, the lender looks at the combined LVR: the first mortgage (its limit, if it can be redrawn) plus the second mortgage plus any capitalised costs, divided by the value. The combined figure must sit within the lender’s maximum for the property type. Because a second mortgage lender ranks behind another lender, it may apply a slightly more conservative maximum.

Cost considerations beyond pricing

• Break costs on fixed-rate loans can make refinancing expensive.
• Legal and registration costs apply to both options, but a refinance documents a larger loan.
• Interest treatment matters: interest can be prepaid or added to the loan for either structure.
• Term: a short need on a large first mortgage may cost more in total than a small second mortgage.
• Exit costs: discharge fees at the end of the loan.

Compare options on the total dollar cost over the realistic term, not on any single figure.

Risk and enforcement

With a second mortgage, there are two lenders with interests in the property. A default on either loan can lead to enforcement that affects the other. Keep both loans in order and communicate early if problems arise. With a single first mortgage, there is one relationship to manage, which some borrowers find simpler.

Illustrative example

Illustrative only. A family company owns its factory outright and needs $900,000 to buy a competitor’s equipment and customer list. There is no existing mortgage, so a private first mortgage over the factory is the natural choice. In another case, a director’s home has a low-rate bank loan fixed for three years and the company needs $150,000 for six months to clear an ATO balance; a second mortgage behind the bank avoids break costs and is repaid when a property sale settles.

Planning the exit for each

Whichever structure you choose, the exit is the same question: how will the loan be repaid and when? For second mortgages, the exit is often a sale, a planned refinance that consolidates both loans, or trading cash flow. For first mortgages, it is commonly a bank refinance once the business is ready, or a sale. The loans are flexible and can stay in place if needed, but the plan should be clear from day one.

Questions to settle before you decide

1. What does it cost to break or repay the existing loan?
2. How much do you need, and for how long?
3. Will the existing lender consent to a second mortgage, and how quickly?
4. Is the existing loan expiring or under review?
5. What is the exit, and does it repay one loan or both?

A third option: the caveat

For very short or urgent needs, a caveat loan sits behind the existing mortgage like a second mortgage but is lodged rather than registered. It is often the quickest structure and can later be converted to a registered second mortgage if the term extends. Our guide comparing caveats and second mortgages explains when it is the better choice.

Using more than one property

Sometimes the answer is neither a large first mortgage nor a single second mortgage, but a combination: a first mortgage over an unencumbered investment property together with a second mortgage behind the bank on the family home. Spreading security can improve the overall LVR, reduce the amount borrowed against any one property and give more flexibility when the exit arrives, because one property can be released while the other remains as security. Your specialist can model these combinations quickly.

Making the decision

The right structure is the one that solves the business need at the lowest total cost and with the least risk, given your existing loan and timeline. Share the property value, your existing loan’s balance and terms, the amount and duration you need, and your exit plan, and a specialist will lay out both options side by side. There is no credit check when you first enquire, your enquiry is not sent to other lenders, and accurate details on your current loan make the comparison meaningful. Compare your options.