How much business or ATO debt is safe to secure against my home?

There is no universal safe number, but once total business-purpose debt secured against your home pushes your overall LVR above about 70–75%, your buffer is thin. At that point, rate rises, valuation drops or income shocks can quickly create mortgage stress. Priority should then be paying down those business splits or shifting them back into dedicated business facilities.

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Should You Use Home Equity To Clear ATO Debt And Overdrafts?

Using home equity to clear ATO debt or a business overdraft can ease cashflow but shifts business risk onto your family home. Learn when it can make sense, how to structure it safely, and what alternatives to consider before you refinance tax or business debt into your mortgage.

Published 7 Sept 2026Updated 7 Sept 20268 min read

Key Takeaway

Using home equity to clear ATO debt or a business overdraft can reduce interest and ease cashflow, but it also shifts unsecured or short‑term business risk onto the family home for up to 30 years. With around 28% of Australian mortgage holders already at risk of mortgage stress (Roy Morgan, 2026), extending exposure can be dangerous. Safer structures use separate, short‑term loan splits, conservative LVRs, and only after testing alternatives like ATO plans and dedicated business facilities.

Should You Use Home Equity To Clear ATO Debt And Overdrafts?

Using home equity to clear an ATO debt or business overdraft can reduce interest and simplify repayments, but it also moves business risk onto your family home for a long time. The safer approach is to treat it as a last resort, keep loan‑to‑value ratios (LVRs) conservative, and quarantine any business‑purpose debt in short, clearly labelled splits with a defined exit plan.

In one line: only refinance tax or overdraft debt into your mortgage if it keeps your home safe under stress tests, alternatives have been checked, and the exposure is tightly contained.

Illustration of home, business overdraft and ATO debts consolidating into a home-secured split Consolidating overdraft and ATO debt into a home-secured split concentrates risk on the family home.

1. What does “pay ATO debt with home equity” really mean?

Using home equity to clear ATO or overdraft debt usually means:

Increasing your home loan (top‑up or new split); and
Using those funds to pay the ATO or close a business overdraft.

You’re swapping:

Short‑term, higher‑rate debt (ATO general interest charge or overdraft rates)
For long‑term, lower‑rate, home‑secured debt.

Key risks in plain language

You turn business or tax problems into mortgage problems.
The debt can stretch from a 1–3 year business issue into 25–30 years of home exposure.
In a rising‑rate environment (RBA cash rate 4.35% in May 2026 and still “somewhat restrictive” per the RBA), that longer exposure can hurt if income drops.

2. Pros and cons: refinancing ATO and overdraft debt into your home loan

Potential benefits

Lower interest cost (usually): home loan rates are typically below overdraft and ATO general interest charge rates.
Cashflow relief: stretching repayment over more years can dramatically lower monthly outgoings.
Simplicity: fewer facilities, fewer deadlines, less stress.

Major downsides

Your home becomes the security for tax and business risk.
You may pay more interest in total if you don’t accelerate repayments.
It’s harder to later separate business, investment and personal debt cleanly.
It can weaken your position if you ever need to negotiate with the ATO or your bank.

Comparison: leave as is vs refinance into the home

Scenario	Typical rate*	Typical term	Security	Main risk
ATO payment plan	GIC ~8–11% (indicative)	1–3 years	Usually unsecured	Tight cashflow, ATO enforcement if you default
Business overdraft	10–15% (indicative)	Ongoing, reviewed	Business / PG	Bank can reduce/call limit; high ongoing cost
Refinance into home (separate split)	5–7% (indicative)	5–30 years	Family home	Home at risk if business or income deteriorates

*Illustrative only, not current quotes. Lenders and rates vary.

For many small business owners, that last column is the critical one.

3. The real risk: securing business debt against your home

If you secure business debt against your home you’re concentrating risk. This is exactly the problem we unpack in /insights/protecting-home-when-you-run-a-business-loans-guarantees.

How it goes wrong

Trading falls, or a key client leaves.
The business can’t meet its obligations.
You’ve moved overdraft and ATO debt into the home loan.
Now missing mortgage payments puts the house on the line, not just the business.

Roy Morgan’s 2026 work shows more than one in four owner‑occupier borrowers are already “At Risk” of mortgage stress. Adding more home‑secured debt at that time needs real caution.

Structural problems to avoid

Cross‑collateralisation: multiple properties tied to multiple loans, making it hard to sell or refinance selectively (see /insights/cross-collateralisation-small-business-owners-pros-cons).
Mixing purposes in one loan: personal, business and investment uses in a single facility complicate tax and exit options.
Using redraw/offset as a rolling overdraft: this functionally converts your mortgage into a business overdraft and concentrates business risk on the family home.

4. If you do refinance tax or overdraft debt into your mortgage, do it like this

Sometimes, using home equity is the only way to avoid a forced sale, statutory demand, or terminal ATO action. In that case, structure and limits are everything. ### 4.1 Keep LVRs conservative - For business use, aim to keep total LVR ≲70–75% where possible (consistent with our guidance in /insights/using-mascot-home-equity-support-small-business-safely). - Stay well clear of 80% to avoid LMI and to preserve future flexibility. ### 4.2 Use separate, short‑term splits Any business‑purpose or tax‑refinance amount should sit in its own split: - Clearly labelled (e.g. “Business – ATO clean‑up”). -…

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Frequently asked questions

Yes, many lenders allow you to release equity and use the funds to pay ATO debts, especially if there is a formal payment plan in place. The bigger question is whether it is wise to do so, because you will be securing tax risk against your family home and potentially stretching a short-term issue over decades. It should generally be a last resort with careful structuring.

Interest deductibility depends on how the original debt arose, not whether your home secures it. If the ATO or overdraft debt came from business or investment activity, properly structured refinance interest is often deductible. If it relates to private spending, the interest is usually not deductible. Mixed-purpose loans can be messy, so seek tax advice and use clearly separated splits.

In many cases it is safer to keep a manageable ATO payment plan because the debt remains unsecured and does not put your home directly at risk. Refinancing into your mortgage may reduce the interest rate but concentrates risk on the family home. It may be worth considering only if the ATO plan is unaffordable or enforcement is imminent, and even then with strict repayment discipline.

When business debt is secured by your home, a downturn in the business can quickly become a mortgage crisis. If trading weakens and you fall behind, the lender ultimately has the right to force the sale of the home to recover the business debt. It also reduces your flexibility to refinance, restructure or sell assets selectively in the future.

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