Second Mortgage or Refinance: Keeping Your Cheap First Loan
Second Mortgage vs Refinance Your Home | Switchboard Finance
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Second Mortgage · Refinance · Self-Employed
Second Mortgage or Refinance: Keeping Your Cheap First Loan
If you already owe on your home, you can raise money two ways: add a second mortgage behind your current loan, or refinance the whole thing into one bigger loan. For self-employed owners, the deciding factor is often whether your first loan is worth protecting.
Quick Answer
A second mortgage adds funds behind your existing home loan, so you keep your cheap first loan; a refinance replaces that loan with a bigger one. If your first rate is worth protecting, a second mortgage or a caveat loan usually beats refinancing.
A second mortgage and a refinance solve the same problem two ways
A second mortgage and a refinance both let you draw on the equity in your home, but they do it in opposite directions. A second mortgage is a new loan that sits behind the first mortgage in priority, leaving your original loan exactly where it is. A refinance does the opposite: it pays out your existing loan and replaces it with a single, larger one.
That is the whole decision in one line, one loan versus two. When someone asks me which is better, the first thing I check is not the interest rate on the new money, it is how good the loan they already hold is. If you want the mechanics first, our explainer on how a second mortgage works walks through registration and consent step by step.
Where a second mortgage is the stronger fit
A second mortgage is the stronger fit when your first loan is already cheap and you want to keep it. If you locked in a low rate, refinancing means giving that up, and on a fixed loan it can also mean break costs on a fixed loan. A second mortgage leaves the first untouched and simply adds funds behind it, which is exactly why owners choose it to keep your cheap first loan intact.
For self-employed borrowers this is where a second mortgage commonly lands, because the funders in this space assess the deal on business cash flow and the equity in the property rather than payslips. Provided your serviceability holds up and there is a clear exit, a second mortgage or private lending can release equity without disturbing a good first loan. It is worth knowing this is a mainstream funding route now, not a fringe one.
Where a refinance is the cleaner call
A refinance is the cleaner call when your first loan is nothing special anyway, because you end up with one loan versus two: one repayment, one set of fees and one lender to deal with. If the rate on your existing loan is no longer competitive, replacing the whole balance can lower what you pay across the entire debt, not just the new portion.
Cost is part of this too. Because a second mortgage ranks behind the first, a second mortgage is typically priced higher than a first, indicative and varies by lender. So if your first loan is not worth protecting, paying a premium on second-ranking money makes little sense, and refinancing the lot usually wins. ASIC's MoneySmart sets out the switching and refinancing process and the fees to check before you move.
The honest test is the cost across the whole debt, not the rate on the headline number. A second mortgage prices only the new money, but at a higher margin; a refinance reprices everything, for better or worse. Add up what each option costs over the period you actually expect to hold the debt, including any establishment fees and, on a fixed first loan, the break cost of ending it early. Sometimes a slightly dearer second mortgage over eighteen months still beats refinancing a large, cheap first loan onto a higher rate. The arithmetic, not the instinct, should settle it, and it is exactly the sum a broker runs with you before you commit.
Where a second mortgage is the stronger fit
- Your first loan is cheap or on a low fixed rate
- Refinancing would trigger break costs on a fixed loan
- You need funds behind the first mortgage without disturbing it
- You are self-employed and assessed on business cash flow and equity
Where it gets tricky
- Your first loan rate is no longer competitive anyway
- You would rather have one loan versus two and one set of fees
- Combined borrowing pushes past what a second lender will sit behind
- Getting first mortgagee consent would slow the deal down too much
Making the call as a self-employed owner
For self-employed owners the call usually comes down to two things: how good your first loan is, and how fast you need the money. Keep a cheap first loan and add behind it; replace a dear one outright. Either path needs first mortgagee consent or a discharge, so the paperwork is real, and where this commonly lands is a straightforward broker conversation rather than a guess.
Speed can override all of it. If a settlement or a tax bill will not wait for a second mortgage or refinance to settle, a caveat loan can release equity in days, then be refinanced into a cheaper facility once there is time. If you are weighing that trade-off, compare a second mortgage against a caveat loan, or start from the Property Lending Hub to see how the facilities line up.
Why first mortgagee consent decides your timing
One practical point decides timing more than any other, and that is first mortgagee consent. A registered second mortgage cannot settle until your existing lender agrees to sit ahead of the new facility, and how long that takes is largely out of your hands. Where the first lender is slow to respond, or will not consent at all, the second-mortgage path narrows and a refinance or a faster facility moves up the list. Knowing your first lender's posture early, before you pin a plan to it, is what saves the most time.
A second mortgage and a refinance answer the same question differently: keep the loan you have and borrow behind it, or replace it with one bigger loan. The decision turns on whether your first loan is worth protecting, what break costs or fees apply, and how quickly you need the funds.
Key takeaway: if your first loan is cheap or fixed, keep it and add a second mortgage; if it is not, a refinance into one loan usually wins.Frequently Asked Questions
Whether a second mortgage or a refinance is better depends on how good your current first loan is. If that loan is cheap or fixed, a second mortgage keeps it in place and adds funds behind it; if it is not competitive, a refinance rolls everything into one loan and one set of fees. A broker can model both against your real rate before you commit.
Taking a second mortgage almost always needs first mortgagee consent, because the new loan sits behind the first mortgage in priority. The existing lender confirms it is comfortable with the extra debt registered against the property, which is a normal step rather than a barrier. Understanding how a second mortgage works makes that request straightforward to manage.
Refinancing a fixed home loan can trigger break costs on a fixed loan, which is one reason owners with a cheap fixed rate often keep it and add a second mortgage instead. On a variable loan there are usually no break costs, though other switching and discharge fees can still apply. It is worth comparing a refinance against a second mortgage or a caveat loan before you decide.
Self-employed owners can get a second mortgage, and it is usually assessed on business cash flow and the equity in the property rather than payslips. A clear serviceability position and a sensible exit still matter, so keep recent figures ready. Non-bank and specialist funders are often more comfortable with self-employed income than the major banks.
If you need funds faster than a second mortgage or a refinance can settle, a caveat loan can release equity in days rather than weeks. It is a short-term facility, so the usual plan is to refinance it into a cheaper second mortgage or term loan once there is time. Speak to a broker about the exit before you draw it.
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