ATO interest charges are surging: what business owners need to know

If dealing with the ATO feels harder lately… you’re not imagining it.

Over the past 18 months, the Australian Taxation Office (ATO) has materially tightened its approach to interest charges, communication, and decision-making, and it’s created enough concern to trigger an external investigation by the Tax Ombudsman, led by Ruth Owens.

This isn’t just a policy update. It’s a shift in behaviour and business owners and tax agents are feeling it.

At the same time, ATO interest charges on tax debt have surged by 185% since 2019, far outpacing the growth of the underlying tax debt itself.

Let’s breakdown what’s really going on.

10 Things you need to know (before your tax debt snowballs)

1. Interest debt is growing faster than the tax debt itself

Between 2019 and 2025, the balance of General Interest Charge (GIC) increased by 185%, compared to a 94% increase in tax debt.

Of the $55 billion in uncontested tax owed, 18% is now interest which is up from 13% in 2019.

In simple terms: the longer it sits, the harder it becomes to get back on top of.

2. The ATO has materially tightened its approach

In late 2023, the ATO adopted a stricter stance on reducing interest, but this change wasn’t clearly communicated by the ATO.

The result? Confusion, frustration, and a growing disconnect between the ATO, taxpayers, and advisors.

For many businesses, it feels like the rules have changed mid-game, without warning.

3. The system isn’t playing out evenly

The review found that larger businesses are more likely to have interest reduced than small businesses or individuals.

Despite making fewer requests, larger businesses are seeing better outcomes.

This raises a real concern

Small businesses make up a significant proportion of Australian businesses and drive a significant share of the economy, yet many feel they’re facing stricter scrutiny and less favourable outcomes.

For those on the ground, it doesn’t always feel like a level playing field.

4. Interest compounds daily (even when you’re doing the right thing)

Even if you’re on an ATO-approved payment plan, GIC continues to compound daily.

This means:

• Your debt can keep growing
• Interest can eventually rival (or exceed) the original tax amount

It’s not just debt, it’s compounding pressure! You can be doing the right thing…and still falling behind.

5. Continued inconsistent decisions are a real concern

One of the biggest findings in the investigation has been inconsistency.

The ATO’s guidance has been too vague, leading to:

• Legitimate applications being declined
• Others being approved without clear reasoning

We’re seeing it firsthand with our clients. Same scenario, completely different outcome, depending on who’s reviewing it.

That kind of unpredictability makes the system even harder to navigate.

6. The ATO can’t stop interest, but it can reduce it

By law, interest must be applied to overdue tax, but the ATO does have discretion to remit (reduce) interest, and in some cases, it absolutely should.

There are examples where interest has become grossly disproportionate to the original debt.

The challenge isn’t just the rules, it’s understanding how and when they’ll be applied.

7. Challenging decisions isn’t straightforward

Challenging decisions isn’t straightforward

Once the ATO makes a decision on GIC remission, there is no formal right to appeal through the courts or the Administrative Review Tribunal.

For many business owners, this feels like hitting a wall.

There is a lesser-known pathway to request a reconsideration, even without new information, but it’s not clearly communicated and often overlooked.

The reality is, navigating this process isn’t straightforward, and many don’t realise their options until it’s too late.

8. The interest rate is designed to influence behaviour

The GIC isn’t just a charge, it’s a tool. The ATO’s position is that interest should be high enough to encourage timely payment.

Depending on market conditions, it can also place additional pressure on businesses already dealing with cash flow challenges.

9. Communication needs serious improvement

The review didn’t hold back here. ATO correspondence around interest decisions is often:

• Generic
• Lacking detail
• Missing clear reasoning
• Light on empathy

When decisions aren’t clearly explained, it becomes even harder for businesses to respond, plan, or challenge outcomes.

10. Changes are being made, but there’s more to do

The ATO has started responding with:

• A dedicated remission team
• Clearer guidance
• Standardised application forms
• Expanded reconsideration options

These are steps in the right direction but they come after significant pressure and scrutiny.

For many, the system still feels complex, inconsistent, and difficult to work through.

What this means for your business

This isn’t just theory, it’s playing out in real time.

At MWM, we’re seeing:

• More aggressive ATO engagement
• Reduced flexibility
• Increasing difficulty navigating processes
• Growing frustration from business owners

And most importantly: Tax debt is becoming more expensive, faster, and harder to manage. Because interest compounds daily, even businesses doing the right thing can see their position worsen over time.

What you should do now

If your business is carrying ATO debt:

• Act early – delays only make things harder
• Don’t assume interest will be reduced
• Seek advice upfront – before decisions are locked in
• Review decisions carefully – there may be options you’re not aware of
• Prioritise lodgements – even if payment isn’t immediately possible

Final word

The system is becoming harder to navigate.

For business owners, that’s translating into more complexity, less clarity, and decisions that are harder to navigate and predict.

And when outcomes aren’t always consistent, it puts even more pressure on those trying to do the right thing.

If dealing with the ATO feels harder than it used to be…that’s because it is.

As always, please reach out if there’s anything that we can help you understand better, assist you with or if there’s anything else that you’d like us to focus on next month.

Until next time, all the best.

James and the MWM Team