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A tax-debt whack could be on the way for small and medium-sized businesses.

After 1 July 2025, taxpayers likely won’t be able to claim a tax deduction for the interest charged on money they owe to the ATO.

It would be a big change affecting many – about 65% of the outstanding $50 billion of ATO debt is owed by small businesses.
Banjo CEO Guy Callaghan and Adrian Palone, Business Advisory Partner at William Buck, with speech bubbles between them showing the words 'TAX', 'SMEs', a percentage symbol, a dollar sign, and a hand icon
“There’s a bit to be worried about here,” says Guy Callaghan, CEO of Banjo Loans.

“We’ve been tracking ATO debt for a while and it’s been a barrier for SMEs seeking finance.”

“Our SME Compass Report 2025 also found that 62% of businesses with an ATO debt saw the amount they owe increase last year. In addition, 77% of those businesses are on a payment plan and already paying interest to the ATO."

“Losing the ability to claim a tax deduction for this interest will put new pressure on thousands of SMEs,” Guy adds.

Understanding the proposed changes, and getting the right advice about how to act, will be critical.

What's changing?

A lot of businesses owe the ATO money.

It could be that they haven’t paid tax on time because working capital is tied up with debtors, or perhaps due to large inventory balances.

Alternatively, it could be they submitted a tax return that wasn’t accurate, resulting in a shortfall that now needs to be paid.

In these two situations, the ATO charges interest on that money owed until it’s paid back – just like a bank.

Currently, businesses can claim a tax deduction for that interest.

But from 1 July 2025, if a proposed bill (Treasury Laws Amendment (Tax Incentives and Integrity) Bill 2025) passes, they won’t be able.

What does this mean for SMEs?

“With no tax relief on the interest charged, that ATO debt will effectively become more ‘expensive’,” says Callaghan.

“The tax burden becomes heavier.”

“Businesses will need to prioritise paying it back ahead of other costs – easier said than done when many smaller operators are already stretched,” he adds.

This new repayment-burden would be a new hit to business cashflow.

The proposed tax law change also suggests that the ATO will be zeroing in on outstanding debts.

SMEs should start talking to trusted advisers, like finance brokers and accountants, to make sure they’re prepared.

How can businesses respond?

SMEs with ATO debt will need to look at their cashflow cycle and build-in the outflows of tax debt repayments.

From this, they'll need to think about whether new finance – or a re-arrangement of their existing funding structure – will be needed to cover the tax debt.

Here, finance brokers can provide great support and advice, and help to find a solution for business funding.

Similarly, your accountant can provide expert advice on tax planning.

The expert’s advice – how to be prepared

Adrian Palone, Business Advisory Partner at William Buck, outlines what business owners can do before 30 June 2025.

“The first thing is to understand the impact of the proposed change on cashflow,” says Adrian.

“Should this tax bill pass, and the existing tax deduction becomes unavailable, then the effective rates of interest payable increase dramatically – in some cases, nearly doubling.”

The below table shows what the change in interest rates would be on general interest charged (GIC) and shortfall interest charged (SIC) by the ATO.

Taxpayer

GIC rates

SIC rates

Individuals

Current

Effective

Current

Effective

11.42%

21.55%

7.42%

14.00%

Companies (base rate)

11.42%

15.23%

7.42%

9.89%

Companies (ordinary rate)

11.42%

16.31%

7.42%

10.60%

Taxpayer

GIC rates

SIC rates

Current

Effective

Current

Effective

Individuals

11.42%

21.55%

7.42%

14.00%

Companies (base rate)

11.42%

15.23%

7.42%

9.89%

Companies (ordinary rate)

11.42%

16.31%

7.42%

10.60%

“SMEs need to consider how they’re managing their existing tax obligations,” adds Adrian.

“Is it through their available cashflow, an ATO payment plan, or a debt facility – and is this strategy the best one available?”

Adrian suggests that if SMEs don’t know the answer, they should speak with an accountant who’s qualified in working with the ATO.

“Accountants can liaise with the ATO and can often help taxpayers to have ATO interest amounts put on hold or even reversed.”

Businesses also need to understand their options for reducing the risk of ATO interest charges. These include:
  • Talking to the ATO: engaging the tax office through a tax agent, putting in place a plan and understanding the nature of your tax debts can often see relief provided.
  • Getting it right first time: taxpayers need to work with their tax agents to ensure their tax returns are correct first time, every time. This way, the risk of a shortfall interest charge is reduced.
  • Managing cashflow: effective cashflow management systems allow business owners to identify when a tax obligation may hit and empower them to plan accordingly.
  • Proactive tax planning: this will help SMEs better understand their tax obligations. If you don’t have a process to identify your options before 30 June each year, then you need to talk to an accountant.
If you're uncertain about how these changes might impact your business, or whether your current strategy is the most effective, seek advice from the experts like Banjo Loans and William Buck.
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