Second Mortgages for Business Cash Flow: Cost, Consent and the Exit

Key takeaways

• A second mortgage ranks behind the first: in a sale the first lender is repaid before the second sees a dollar, which is why it costs more.
• Most bank mortgages need the bank's consent to a second, often with a deed of priority capping the amount the bank ranks ahead for.
• Lenders cap total debt on the property: in the example, a 70% cap leaves room for $220,000, not the $250,000 requested.
• At an example 13.5% plus fees, $250,000 for 12 months costs $43,500, or 17.4% of the loan.
• A one-off need with a dated exit suits a second mortgage; a permanent shortfall in working capital does not.
• Match the facility to the problem: lump-sum needs and cash cycles call for different products.

When does a second mortgage make sense for business cash flow?

Business owners often have equity in property but cash tied up in the business: a large job to fund before the client pays, a tax debt to clear, stock for a big order, a temporary dip in trade. Refinancing the whole first mortgage to release equity can mean break costs on a fixed rate, a new valuation, a full credit assessment of the business and weeks of paperwork, and a bank that has seen one weak year may not lend more at all. A second mortgage leaves the first loan in place and adds a second-ranking loan behind it.

It suits a defined need with a defined end: a contract payment due in five months, a property sale, a refinance once the next financial statements are lodged. It suits a permanent shortfall badly. A loan of 6 to 24 months at private rates (indicative terms) cannot fix a business that consistently spends more than it collects; it only adds interest to the problem.

Does the first mortgagee have to consent?

Usually, yes. Most bank mortgages include a clause that stops you granting further security over the property without the bank's written consent, and many second mortgage lenders will only lend with that consent in hand. Expect the first lender to ask:

• How much is being borrowed, and for what purpose?
• What priority it keeps. A deed of priority fixes the amount the first lender ranks ahead for, usually its current limit plus a margin for interest and costs.
• Whether the first loan is up to date and the business is within its covenants.

Some banks refuse as a matter of policy, particularly where they also lend to the business. A refusal is useful information: it may point to refinancing the first loan into one larger private loan, which changes the cost sharply, or to a different product altogether. Second mortgages: consent, priority and bad credit covers what lenders ask for. Do not try to get around a refusal with an unregistered charge that breaches the first mortgage, because that can put the first loan in default.

Why does business purpose matter for a second mortgage?

Most private second mortgages are written as business-purpose loans. Credit for personal, domestic or household purposes, and for buying or improving residential investment property, is generally regulated under the National Consumer Credit Protection Act 2009, and the obligations ASIC describes on its responsible lending page are framed around credit contracts with consumers. A loan to fund a business is generally outside that regime, so the lender will ask you to sign a business purpose declaration and may ask how the money will be used.

Two consequences follow. The declaration has to be true: signing one for money that is really for personal spending is a serious matter. And you get fewer statutory protections, so read the loan agreement with a solicitor. The post on business purpose declarations explains what you are signing.

How much can you borrow behind the first mortgage?

Second mortgage lenders lend against total LVR: all the debt on the property, first and second together, divided by the lender's valuation. For illustration, take a property valued at $1,600,000 with a $900,000 first mortgage (a 56.3% LVR):

A borrower asking for $250,000 takes total debt to $1,150,000, or 71.9%. That fits a 75% cap but not a 70% one. Caps depend on the lender, property type and location, and commercial, rural or vacant property often faces a lower cap than a house in a capital city (indicative). Watch the deed of priority as well: if the first lender's priority amount is set above its current balance, some second lenders use the priority amount, not the balance, in the total LVR.

What does a second mortgage cost?

Second-ranking risk is priced above first-ranking risk for three reasons. If the property is sold under enforcement, sale costs and the first lender are paid first and the second lender absorbs any shortfall. The second lender usually has to deal with the first before it can enforce. And it has to watch the first loan for arrears it does not control. For illustration only, a $250,000 second mortgage for 12 months at an example 13.5% a year, with an example 2.5% establishment fee and $3,500 of legal and valuation costs:

Ask whether interest is paid monthly, capitalised or prepaid, whether there is an exit or early repayment fee, and what the default rate is. Each lender sets its own pricing, and the wider market moves with the RBA's cash rate target, which was 4.60% from 30 September 2026 (check the current figure). For the full fee picture, see private loan fees: establishment, brokerage and exit costs, and model the term with the bridging finance calculator.

How does a second mortgage compare with an overdraft or invoice finance?

The real question is whether the cash need is a lump or a cycle. A tax debt, a deposit on a contract, or a bridge to a property sale is a lump with an end date. Customers paying in 60 days while you pay staff weekly is a cycle that recurs every month, and funding it with a 12-month second mortgage means paying private rates on a balance that never goes away. business.gov.au's guide to managing cash flow covers the operating side: invoicing promptly, following up overdue accounts and negotiating supplier terms. For the facility comparison, see invoice finance vs an overdraft.

What exit pays out the second mortgage?

Every second mortgage lender asks how you will repay it at the end of the term. Credible exits are:

• A refinance into one bank loan, once the next financial statements show the dip has passed.
• A sale of the property or another asset.
• A contract payment or receivable with a date and a creditworthy payer.
• Business cash flow, only if the forecast genuinely shows enough surplus within the term; it is rarely enough alone.

Test the refinance exit with numbers. In the example, a bank would have to lend $1,150,000 in total, a 71.9% LVR. At an example 7.5% over 25 years, principal and interest, that is about $8,498 a month, against about $6,651 a month on the current $900,000 at the same rate: around $1,847 a month more, which the business must show it can carry at the bank's assessment rate. If it cannot, the refinance is not an exit, and the realistic exit is a sale.

If the exit fails, costs compound through extension fees and default interest, and eventually a sale on the lender's timetable. See exit strategies for short-term loans for how lenders judge them.

What are the common mistakes, and what should you do next?

• Using a second mortgage to fund a gap that recurs every month.
• Leaving the first lender's consent until the last week.
• Ignoring the priority amount when working out how much room there is.
• Comparing interest rates and forgetting establishment, legal and exit fees.
• Offering an exit with no evidence behind it.

Before you ask, gather the first mortgage statement and terms, a valuation estimate, the last two years of financial statements, a 12-month cash flow forecast and written evidence of the exit. If a tax debt is the reason, read getting a loan with an ATO tax debt. Then post one second mortgage request on ADS with the purpose, security and exit, and 200+ verified lenders and brokers can ask about it.

Frequently asked questions

Can I get a second mortgage without my bank's consent?

Some lenders lend without the first lender's consent, often by way of a caveat, but most bank mortgages prohibit further security without consent, so doing it can put your first loan in breach. Ask your bank first. If it refuses, consider refinancing the first loan or a different facility, and get legal advice on the terms of your existing mortgage.

How much does a second mortgage cost for a business?

It varies by lender, property and LVR, and is usually well above bank pricing. In the illustrative example, $250,000 for 12 months at 13.5% with a 2.5% establishment fee and $3,500 of costs totals $43,500, or 17.4% of the loan. Ask about default rates, exit fees and whether interest is prepaid or capitalised.

What is a deed of priority?

A deed of priority is an agreement between the first and second lenders, signed by you as well, that sets how much the first lender ranks ahead for, called the priority amount. Above that amount the second lender ranks first. It stops the first loan being increased later at the second lender's expense, and many second lenders require one.

Is a second mortgage better than an overdraft?

Not for a recurring gap. An overdraft or invoice finance matches borrowing to your cash cycle and usually costs less over time. A second mortgage suits a one-off need with a dated exit, such as clearing a tax debt or carrying a contract until payment, when the bank will not extend more.

What total LVR will a second mortgage lender allow?

It depends on the lender and the property. As an indicative range, many cap combined first and second debt at around 70% to 80% of a residential property's value, and lower for commercial, rural or vacant land. In the example, a 70% cap on a $1,600,000 property with a $900,000 first mortgage leaves room for $220,000.

Can a second mortgage be used to pay an ATO debt?

It is a common use, because clearing tax debt can stop penalties and enforcement and may help a later bank refinance. Lenders will want to see the debt, any payment plan and a separate exit for the second mortgage itself, since the tax debt was the problem, not the repayment source.

Related reading

• Second Mortgages: Consent, Priority and Bad Credit
• Mezzanine and Second Mortgage Finance
• Invoice Finance vs Overdraft: Which Fixes Your Cash Flow?

Sources

• National Consumer Credit Protection Act 2009 — Federal Register of Legislation
• Responsible lending — Australian Securities and Investments Commission
• Cash rate target — Reserve Bank of Australia
• Guide to managing cash flow — business.gov.au