Key Takeaways
- Adding a tax debt to a 30-year home loan can cost around 10 times as much interest as a two-year ATO payment plan, even at roughly half the rate.
- A separate loan split with its own repayment target keeps the tax portion visible and on a short timeline.
- Usable equity is usually 80% of the property’s value less the current loan, and the larger loan is tested at a rate at least 3 percentage points above the one charged.
- Interest on a personal home loan used to clear a company’s or trust’s tax debt is not normally deductible to the borrowers.
A $150,000 debt to the Australian Taxation Office (ATO) sitting beside a home loan at roughly half the interest rate looks like an easy decision. Move one into the other and the problem appears to shrink overnight. For many owners who consolidate tax debt into a mortgage, it does, but only when the loan clears the balance on a timeline close to the one the ATO would have expected.
The general interest charge (GIC) on overdue tax is 11.51% a year for the October to December 2026 quarter, according to the ATO’s published GIC rates. It compounds daily, and under the Treasury Laws Amendment (Tax Incentives and Integrity) Act 2025, GIC incurred from 1 July 2025 is no longer deductible.
Where the equity is there and a payout looks likely, a tax debt mortgage broker can confirm which lenders accept tax debt as a loan purpose and which property should carry it. What happens inside the loan after that tends to matter more than the headline rate.
Ways to Add Tax Debt to a Home Loan
Tax debt usually reaches a home loan through your current lender, a new lender or a second lender behind the first, and each suits a different starting position:
Loan Top-Up
A home loan top-up increases the limit on your existing loan with the lender you already have. With no discharge and no new title registration, the paperwork is usually lighter and the timeline shorter than a full switch.
Some lenders will not approve a top-up where the stated purpose is paying a tax debt, whatever the equity position. A declined top-up followed by a refinance can take longer than going straight to a lender that accepts the purpose. Where your current lender accepts it, the new funds are often set up as a separate split, which also avoids break costs if the existing loan is fixed.
Full Refinance
A full refinance moves the whole home loan to a new lender whose credit policy accepts tax debt as a purpose, with the tax balance added to the new limit. It tends to suit owners whose current lender has declined a top-up, or whose existing rate is no longer competitive anyway.
It also costs more to set up. The old loan is discharged, the new one is established, a fresh valuation is ordered and any fixed rate on the old loan may attract break costs, which the current lender can estimate on request. A refinance broker can usually tell early whether the new rate covers those costs before the tax debt is factored in.
Second Mortgage
A second mortgage is a separate loan registered behind the existing first mortgage, leaving the original home loan untouched. It is typically offered by specialist or private lenders, runs for a shorter term and carries a higher rate than a first mortgage. A private lending broker can compare those terms against the cost of a top-up or refinance before a second charge is considered.
It tends to appear where the first lender will not top up and a refinance does not stack up, for example where the existing loan has an unusually good fixed rate with years left to run. Some first-mortgage contracts require the first lender’s consent before a second charge is registered, so that permission usually needs checking first.
Does Consolidating Tax Debt Cost Less Than a Payment Plan?
It usually does when the tax portion is repaid over a similar period to the plan it replaces, and it can cost far more when it is not. The comparison turns on these points:
Total Interest Over the Real Payback Period
The fair comparison is the total interest paid until the balance reaches zero, not 11.51% set against a home loan rate. Total interest depends as much on time as on rate.
An ATO payment plan forces a short horizon, often two years or less. A home loan does the opposite. Its default repayment spreads any added amount across the remaining term, which may be 25 or 30 years, so the lower rate works on the balance for far longer.
After-Tax Cost on Each Side
GIC is paid in full with no tax offset, while interest on the new borrowing may be deductible, which lowers its after-tax cost by the borrower’s tax rate. At an illustrative 30% tax rate, a deductible 6.5% loan costs about 4.55% after tax.
Deductibility depends on who borrows and how the tax debt arose. Where a sole trader, company or trust borrows to pay tax debts from its own business, the interest is often deductible, depending on the type of tax owed. Individuals who borrow through a personal home loan to pay a company’s or trust’s tax debt are in a different position, because the interest is not normally deductible to them.
The after-tax result can shift in either direction, so it belongs with your accountant before the loan amount is set.
Worked Example on a $150,000 Debt
On a $150,000 debt, a three-year mortgage split may cost slightly less interest than a two-year ATO plan, while leaving the debt on a 30-year term may cost roughly 10 times as much. The figures assume the October to December 2026 GIC rate holds steady and an illustrative home loan rate of 6.5%, rounded and excluding fees and tax.
| Repayment Path | Monthly Repayment | Total Interest |
| ATO payment plan over two years at 11.51% | About $7,030 | About $18,700 |
| Mortgage split over three years at 6.5% | About $4,600 | About $15,500 |
| Mortgage split over five years at 6.5% | About $2,930 | About $26,100 |
| Mortgage balance over 30 years at 6.5% | About $950 | About $191,300 |
These figures are a general guide only. GIC is reset each quarter, home loan rates vary by lender and borrower and actual costs will differ.
The three-year split also cuts the monthly repayment by about $2,400 compared with the plan. Stretching the debt to five years costs more in total than the plan, even at just over half the rate, so a lower rate alone does not make consolidation cheaper.
A lower monthly repayment is a legitimate reason to consolidate, provided the extra total cost is accepted knowingly.
Consolidation Costs Against the Saving
Moving the debt costs money before it saves any, and the charges usually fall into these groups:
- Establishment or top-up fees.
- Valuation fees.
- Legal and settlement costs.
- Discharge fees on a refinance.
- Break costs on an early exit from a fixed rate.
Fees and charges vary by lender and loan, so this list is a general guide only.
Lenders mortgage insurance (LMI) can change the whole calculation. It may apply where the new balance takes the loan-to-value ratio (LVR) above 80%, and on a larger loan the premium can run into the thousands of dollars, sometimes enough to erase the interest saved on a modest tax debt. The worked example excludes these costs, so they come straight off its savings.
Break-Even Point on a Smaller Debt
Consolidation tends to earn back its costs on larger balances and longer plans. On a $20,000 debt with eight months left on a plan that is being met, the remaining GIC may be smaller than the fees involved in adding it to a mortgage.
A rough test is to estimate the GIC still to come under the current plan and set it against the total cost of the loan change. Where the fees come close to or exceed the interest avoided, keeping the plan and paying it faster may leave you better off, and it keeps the home out of the arrangement.
Interest-Free Plans on Activity Statement Debt
Where a small business qualifies for the ATO’s interest-free payment plan on overdue activity statement amounts, consolidating that debt into a mortgage is unlikely to cost less. GIC still appears on the account, but the ATO automatically remits it while the plan is maintained, and the amount must be cleared by direct debit within 12 months. The ATO sets out these eligibility conditions:
- Annual turnover under $2 million.
- Recent activity statement amounts of $50,000 or less, overdue for up to 12 months.
- No more than one payment plan default in the past 12 months, with no activity statements left unlodged.
- No access to finance through normal business channels.
- Evidence of ongoing viability.
The criteria may change, so they are a general guide only. The finance condition means an owner able to consolidate may not qualify, and the plan does not cover income tax debts, so it tends to help only part of a mixed balance.
How Much Equity and Income Do You Need?
You need enough equity to keep the new balance within the lender’s limit, and enough verified income to repay the larger loan at a tested rate higher than the one you will actually pay. Each is assessed on its own terms:
Usable Equity Below 80% of Value
Usable equity is usually worked out as 80% of the property’s value, less what is already owed. On a home valued at $900,000 with a $520,000 loan, 80% of the value is $720,000, leaving about $200,000 that could be drawn without LMI.
The valuation that counts is the lender’s, not an online estimate or a recent sale down the street. Lenders that accept tax debt as a purpose may also cap the LVR below 80% for this kind of cash-out, or limit the amount released, so the usable figure can be smaller than the arithmetic suggests.
Serviceability at the Assessment Rate
Lenders regulated by the Australian Prudential Regulation Authority (APRA) are expected to test repayments at a rate at least 3 percentage points above the actual loan rate. APRA confirmed in May 2026 that this serviceability buffer would stay unchanged. A loan priced at 6.5% is therefore assessed at 9.5% or higher.
The payment plan instalment drops out of your expenses once the debt is cleared. The larger loan replaces it, though, and the lender tests that loan at the buffered rate, often over the remaining term. A short contractual term on the tax portion raises the assessed repayment further, and on a borderline file that can decide the result.
Debt-to-Income Ratio After the Top-Up
Adding a tax debt raises your debt-to-income (DTI) ratio, and once it reaches six times income, some banks may reprice the loan, ask for more evidence or decline it. DTI is total debt divided by gross income. APRA limits banks to writing no more than 20% of new home lending at a DTI of six times or higher, a setting APRA reviews periodically and left unchanged in May 2026.
The limit applies to each bank’s overall lending, not to any individual borrower. An owner earning $200,000 with a $1,050,000 loan who adds $150,000 moves from just over five times income to six times, and how a bank responds depends on how much room it has left under the limit. Non-bank lenders are generally not bound by the same limit, which is part of why the lender match matters.
Financials Behind the Tax Debt
The income a lender assesses comes from the same returns and financial statements that produced the tax debt. A year that ended with a large unpaid liability may also show strong profit, which helps, or a cash squeeze the assessor will ask about.
Beyond income, the shape of the debt matters too, and how lenders read tax debt decides which of them will consider the file at all.
How to Structure Tax Debt Inside Your Mortgage
Set the tax debt up as its own portion of the loan, with a repayment target that matches the debt instead of the house. The choices that make that work are:
Separate Loan Split for the Tax Portion
Most lenders allow a home loan to be divided into splits, each with its own balance, rate type and repayment. Placing the tax amount in its own split keeps it visible on every statement, so you can watch it fall instead of seeing it disappear into a larger home loan balance.
A split can also be paid off and closed separately, and refinanced later on its own terms without disturbing the main loan.
Repayment Target on the Tax Split
Keeping the tax split’s repayment target close to the timeline of the plan it replaces is what keeps consolidation cheaper than the plan. The contractual term sets only the minimum repayment, and the gap between that minimum and what you actually pay is where consolidation either works or quietly fails.
A contractual term of three to five years forces the pace, but it lifts the repayment the lender assesses and leaves little room in a lean month. A longer contractual term with voluntary higher repayments keeps flexibility and helps serviceability, at the cost of relying on discipline. What matters is choosing the target deliberately and setting it up as an automatic repayment from settlement day.
Rate Type on the Tax Split
A variable rate tends to fit the tax split, because variable loans typically allow unlimited extra repayments and early payout without break costs. Some fixed-rate loans cap extra repayments or charge break costs when repaid early, which works against clearing the debt ahead of schedule.
Where the rest of the loan is fixed, many lenders allow the tax split to be set up as variable on its own. Whether that is available, and on what terms, depends on the lender.
Principal and Interest on the Tax Split
Principal and interest repayments suit the tax split because they reduce the balance from the first month. Interest-only repayments leave the balance exactly where it started for the whole interest-only period, which defeats the reason for moving the debt.
Some lenders offer interest-only on a split for cash flow reasons. In a tight period, that can buy time, but it usually adds to the total cost and pushes the end date out.
Purpose Tracing for Deductibility
A dedicated split keeps the use of the borrowed funds traceable, which protects whatever deductibility position your accountant confirms. When borrowed money is mixed, for example by redrawing from the tax split to pay for a holiday, the purpose becomes blended and the deductible share may need to be apportioned.
General interest deductibility principles follow the use of the funds, not the security, so keeping the tax split clean from the start saves unpicking it later.
Extra Repayments Across the Splits
Extra repayments and offset balances often do the most work on whichever split costs more after tax, which at the same rate is usually the non-deductible one. On a loan with more than one split, they can only reduce one portion at a time.
Where the tax split turns out to be deductible, the reverse may apply, so the placement follows from the rate and tax treatment of each split.
What Changes When the Tax Debt Isn’t in Your Name?
More people may need to sign, fewer consumer protections may apply and the payment needs recording differently when personal property clears a liability that belongs to a company, a trust or one owner alone:
Company or Trust Debt on a Personal Mortgage
Many tax debts sit in a trading company or trust while the home sits in personal names. Using the home to pay that debt means the borrowers take on personal liability for what was an entity’s obligation.
Lenders treat this differently from an ordinary cash-out. Some require the entity’s financials alongside the personal application, some want directors or trustees to sign in more than one capacity and some will only lend where the entity is also a party to the loan. A company home loan broker can match the structure to a lender whose policy accepts it before an application is lodged.
Co-Owner Consent for Someone Else’s Debt
Every registered owner of the property must sign the mortgage. Where the home is jointly owned but the tax debt belongs to one partner or their business, the other owner is putting their share of the home behind a debt that is not theirs.
If both owners are borrowers, each is usually liable for the whole loan, not half of it.
Where the owner who does not owe the tax receives no direct benefit, some lenders require them to obtain independent legal advice and provide a certificate before settlement. Even where it is not required, that advice may be worth having, since it is the only point where their position is looked at on its own.
Credit Law Protections for Business Purpose Loans
Borrowing to pay a business tax debt may fall outside the consumer protections that usually apply to a home loan. The National Credit Code, set out in Schedule 1 of the National Consumer Credit Protection Act 2009, applies where credit is provided wholly or predominantly for personal, domestic or household purposes, or to buy, renovate or improve residential investment property.
Where more than half of the credit is intended for business purposes, the Code does not apply, and neither do the consumer protections tied to a regulated loan, including responsible lending obligations.
Some lenders ask borrowers to sign a business purpose declaration before the contract, which can create a presumption that the Code does not apply to the loan. Before signing one, it helps to know what the declaration changes and whether part of the loan stays regulated where the funds serve mixed purposes.
Director Loan Account for the Payment
When a director pays a company’s tax debt with personally borrowed money, the company usually ends up owing that amount to the director. Your accountant records it through a director loan account, and that record affects how later repayments from the company to you are treated.
Recording it at settlement is simpler than reconstructing it at year-end, and the record may matter if the company later struggles to repay you.
Risks of Consolidating Tax Debt Into a Home Loan
Consolidation changes the nature of the debt as well as its price, and the trade-offs tend to show up after settlement:
Home Exposure
An ATO debt is not secured against your home. Once it moves into the mortgage, it is. Missed home loan repayments carry consequences a payment plan default does not, including the lender’s right to take enforcement action against the property.
The ATO has its own recovery powers, so an unpaid tax debt carries risk too. The difference is that consolidation makes the home the direct security for what used to be a tax liability.
Term Creep
A split set up with a clear target can drift back to the minimum repayment after a tight quarter, and the minimum is whatever the contractual term allows. A year later, the tax portion may be sitting on the same slow schedule as the rest of the home loan.
Redrawing from the tax split has the same effect in reverse, adding back what was already paid off. Checking the split’s balance against its target date each quarter tends to catch drift early.
Repeat Arrears
Clearing a tax debt does not change the cash flow habits that produced it. Where the next quarter’s activity statement or instalment is not funded as it falls due, a new ATO balance can start building while the old one is still being repaid through the mortgage.
Setting aside for each quarter’s liability from settlement day, one of the usual steps for paying out ATO tax debt, can stop that second balance forming. Two tax debts on one household balance sheet, one old and one new, make a harder file to take to any lender.
Thinner Equity Buffer
Every dollar of tax debt added to the mortgage uses equity that could otherwise absorb a fall in property values or fund the business later. A loan sitting near 80% leaves little room for either.
The faster the tax portion clears, the sooner that equity is available again.
Unresolved Trading Losses
Consolidation resets the ATO balance to zero. It does nothing for a business that is still spending more than it earns, and in that case the home is funding losses that may keep recurring.
Where the business is still under pressure, restructuring business debt or closing the cash flow gap may need to come before any payout. If there is genuine doubt about the business continuing, advice from your accountant or a registered insolvency practitioner before securing its debt against the home may protect you from a harder outcome later.
Tax Debt Cleared in Years, Not Decades
What keeps most owners in this position awake is rarely the tax debt itself. It is the fear of swapping one problem for a longer one, and of putting the family home behind a balance that never seems to move.
Once the tax portion has its own end date, it stops being a charge that grows every day and becomes a known number with a finish line. The compounding stops at settlement. From there, the pace is yours to set.
If you are weighing up whether to move a tax debt into your home loan, the team at Loanworx Group can talk you through the options that suit your circumstances.
Frequently Asked Questions (FAQs)
1. Can I consolidate tax debt into an investment property loan?
It may be possible where the investment property has enough equity and the lender accepts the purpose. The security changes, but the use of the funds does not, so the lender still assesses the loan as a tax debt payout, not as investment borrowing.
Using an investment property keeps the family home out of the arrangement, which some owners prefer. Investment loans may carry different pricing, and deductibility still follows the purpose of the funds, not the property securing them.
2. Will consolidating tax debt affect my credit score?
The loan application usually records a credit enquiry on your file, whether it is a top-up or a refinance, and several applications in a short period may count against you. The new loan also appears as a larger credit limit.
Once the tax debt is paid, any business tax debt information the ATO had reported to credit reporting bureaus is generally removed when the reporting criteria are no longer met. Applying only to lenders likely to accept the purpose limits unnecessary enquiries.
3. Can I consolidate other business debts at the same time?
Some owners roll a tax debt, an equipment loan and a business credit card into one facility. Each extra debt adds to the loan amount, the LVR and the serviceability test, so combining them may push a borderline application past a lender’s limits.
Short-term business liabilities placed on a long home loan term can cost more overall, which is why a separate split and repayment target for each is often worth considering.
4. Can I consolidate a personal income tax debt, not a business one?
In many cases, yes. The same mechanics apply, and some lenders are more comfortable with a personal tax debt than a business one.
Interest on borrowing used to pay personal income tax is generally not deductible, which leaves no tax saving on the loan side to soften a longer term. That makes the repayment target on the split even more important.
5. What happens if a new tax debt appears after I consolidate?
A new liability generally needs paying when it falls due, or its own payment arrangement with the ATO. It does not attach to the mortgage automatically. Adding it later would mean a fresh application, assessed on your circumstances at that time.
Loanworx Group can review the split and the loan after settlement as the business position changes, which may bring a new balance to light while it is still small.
This article is general information only. It does not take your objectives, financial situation or needs into account, and you may wish to speak with a qualified accountant, registered tax agent or licensed credit adviser before acting. Lending approval, rates, fees and loan features depend on lender assessment and can change. The general interest charge is set quarterly by the ATO, and the rate quoted applies to the October to December 2026 quarter.
