Second mortgage to pay tax debt: using property equity to clear the ATO

What is a second mortgage, and why use one for tax debt?

Most business owners who own property have some equity: the gap between what the property is worth and what’s owed on it. A second mortgage borrows against that gap. The existing first mortgage stays exactly as it is — same lender, same repayments — and a second lender registers its mortgage behind it.

For ATO debt, that’s useful for two reasons. First, it leaves a home loan or commercial loan you’re happy with untouched. Second, it can usually be arranged faster than a full refinance, because the new lender is only assessing the second position, not taking over the whole debt.

Second mortgage, caveat loan or refinance?

All three use property, but they suit different situations:

• Caveat loan. Quickest to put in place, built for short terms of months. Best when there’s an urgent deadline and a near-certain exit. See caveat loans for ATO debt.
• Second mortgage. A registered mortgage, so it can usually run longer — useful if the exit is a refinance or sale that may take some time, or if the debt is larger.
• Refinance. Replaces the first mortgage with a larger loan that clears the ATO as well. Often the cheapest long-term structure, but slower and more demanding. See refinancing ATO debt.

A sensible pattern for urgent cases is to use a second mortgage or caveat loan to clear the ATO now, then refinance into a longer facility once the tax account is at nil and the business’s position is stronger.

Residential or commercial property — does it matter?

Both can be used, and both are common. A few differences:

	Residential	Commercial
Typical owners	Directors personally, family trusts	The business, a related entity or SMSF-excluded holdings
Valuation	Usually quicker and simpler	Can take longer; depends on use and leases
Who signs	Every owner on title	Every owner, plus any guarantors
Things to weigh	It’s the family home or an investment	Lease terms, vacancy, zoning

Whatever the property, the loan must be for business purposes. Clearing a company’s ATO debt is a business purpose, which is why these loans are commonly used for tax.

What about my existing lender?

This is the step that most often surprises people. Many first mortgages include a clause requiring the first lender’s consent before any second mortgage is registered. Some banks give consent quickly; others take weeks or decline. Because of that:

• we look at the existing loan terms on the first call;
• if consent is likely to be slow, a caveat loan may be a better first step;
• if the first mortgage is close to its limit, a refinance may be the only realistic option.

There’s no point arranging a second mortgage that can’t settle before your ATO deadline.

Is the ATO’s secured payment plan an alternative?

It can be. The ATO accepts security — preferably a registered mortgage over freehold property or an unconditional bank guarantee from an Australian bank — for deferring payment or for an instalment plan where a standard arrangement can’t be reached. It’s worth asking about if your main goal is time.

The trade-offs are that GIC keeps compounding daily on the outstanding balance, GIC from 1 July 2025 isn’t deductible, and the debt remains with the ATO. If there’s a director penalty with the lockdown applied, only payment removes the personal exposure. A second mortgage pays the ATO out and turns the tax debt into an ordinary commercial loan. Our payment plan vs loan comparison sets out how to weigh the two.

What should you think about before using your home?

Using the family home to secure a business loan is a serious step, and we’d rather you take it with your eyes open:

• Talk to everyone on title. Spouses and co-owners need to understand and agree.
• Model the repayments against realistic, not best-case, trading.
• Know the exit. If it’s a short-term loan, know how it will be repaid and what happens if that’s late.
• Ask your accountant about the tax treatment of interest, which may be deductible depending on who borrows and how.
• Weigh the alternatives honestly. If the business can’t recover, borrowing against the home only puts the home at risk. That’s a moment for free advice from the Small Business Debt Helpline, not a loan.

What does a typical second mortgage for tax debt look like?

Here’s an illustrative example only. A director of a small engineering firm owns a home with a modest bank mortgage. The company owes the ATO a mix of GST, PAYG withholding and income tax, and a standard director penalty notice has just arrived. The online payment plan option doesn’t fit the size of the debt, and the company is trading profitably again after losing a large customer the year before.

A second mortgage over the home clears the full ATO balance within the 21 days, paid straight to the ATO at settlement, while the existing home loan stays untouched. The plan is to refinance both loans into one longer facility after twelve months of clean trading.

Could your property equity clear the ATO?

If you own residential or commercial property and the ATO debt is weighing on the business, see if you qualify. There’s no credit check to enquire, your details stay with one team rather than a list of lenders, and someone who knows second mortgages and ATO deadlines will call you back. Tell us the property, the first mortgage balance and the ATO amount as accurately as you can — that’s how we work out on the first call whether a second mortgage, a caveat loan or a refinance fits best.