You lodged your income tax return expecting a refund. The number looked healthy, you had already earmarked what it would go towards, and then the money never arrived. Or a much smaller amount landed than you were told to expect. If that has happened to you, you have almost certainly run into ATO offsetting.

Offsetting is one of the least understood parts of how the ATO handles your money, and it catches business owners out constantly, especially those carrying a debt on another account or running a payment plan. As a Chartered Tax Advisor and CPA, I see it play out most often when a client assumes a refund is theirs to spend, only to discover the ATO has quietly applied it against a debt sitting somewhere else in their file.

Here is exactly how offsetting works, what it does when you are on a payment plan, and the decision I walk clients through whenever a credit lands on their account.

The ATO does not run one account, it runs several

The first thing to understand is that the ATO does not keep a single tally of what you owe or what you are owed. It keeps several separate running balance accounts, each with its own balance, and each dealing with a different type of obligation.

For most business owners, two accounts do the heavy lifting:

• The Income Tax Account. This is where your income tax sits, the tax on your business and personal income after your return is lodged and assessed.
• The Integrated Client Account (ICA). Sometimes called your activity statement account, this is where your GST, PAYG withholding, PAYG instalments and other business activity statement obligations are recorded.

Each account can be in credit (the ATO owes you) or in debit (you owe the ATO) at any given time. It is entirely possible to have a refund owing on one account while carrying a debt on the other, and that is precisely the situation where offsetting comes into play. If you want to understand the obligations that flow through the ICA, our guides on how PAYG instalments work and lodging your BAS are a good place to start.

What offsetting actually means

Offsetting is where the ATO uses a credit or refund sitting on one account to pay down a debt on another account. As the ATO explains it, offsetting is generally automatic, and it applies credits against your tax debts before any debts you might have with other government agencies.

In plain terms, if you are owed money on one account and you owe money on another, the ATO nets them off first and only pays you what is left. A couple of common examples:

• A GST refund sitting on your Integrated Client Account is applied against an income tax debt on your Income Tax Account.
• An income tax refund is applied against an outstanding GST or PAYG amount on your ICA.

Here is what that looks like in practice. Say your company is owed a $12,000 GST refund on its Integrated Client Account but still owes $8,000 in income tax. Rather than paying out the $12,000 and separately chasing the $8,000, the ATO applies the credit to the debt and refunds you the $4,000 difference.

This all happens before a cent reaches your bank account. The ATO can also offset a credit against a debt you have with another government department, such as Services Australia, and against debts it had previously placed on hold. You can read the full ATO explanation on its offsetting page.

The refund you were counting on may never hit your bank

This is the part that stings. You might be expecting a clean cash refund, only to receive a reduced amount or nothing at all, because the ATO has used it to reduce a debt elsewhere. The money was never wasted, it went towards a genuine liability, but if you had already mentally spent it on a purchase, a distribution or simply on cash flow, the surprise can be a real problem.

When the ATO does not have to offset

There is an important nuance here. The ATO is not always required to offset. It states that in certain circumstances it does not have to apply a credit against a debt, including where the amount owing is due but not yet payable, is subject to a payment arrangement you are complying with, is an amount recovery has been deferred on, or relates to director penalties.

Where one of those situations applies, the ATO may still choose to refund the full or partial amount if it considers it appropriate. It encourages you to contact it before or at the time of lodging if you think one of these applies to you. In practice this means the outcome is not always black and white, so it pays to know where you stand before you lodge rather than hoping for the best.

What offsetting looks like on your accounts

When an offset happens, it is not hidden. The amount moved from one account to another appears on the relevant statement of account, and the ATO will notify you about the offset. If your refund is used to pay an amount owed to another government department, that department will also let you know an amount has been paid on your behalf.

The catch is that most business owners only look at these statements after the money has already moved. By then the decision has been made for you. This is one of the many reasons accurate, up to date records matter: if you know your position across both accounts in advance, an offset is never a surprise.

How offsetting works when you are on a payment plan

This is where offsetting becomes genuinely costly if it is misunderstood, and it is the single point I most want business owners to take away from this article.

A credit does not replace your instalment

When you have a payment plan in place and a refund or credit is applied to reduce the debt, that is a good thing: the balance comes down faster. But the ATO is explicit that a credit applied through offsetting will not replace your required instalment payment. You must keep making the agreed payments, on schedule, until the balance reaches nil.

In other words, a credit landing on your account does not buy you a month off. The plan does not automatically shrink or pause because a credit has reduced the balance. If you assume it does and skip a payment, you are heading for trouble.

Income tax and activity statement accounts need separate plans

Because the ATO runs your income tax and activity statement obligations as separate accounts, they require separate payment plans. If you have overdue debts on more than one account, you either pay them in full or set up a separate arrangement for each. It is common for a business owner to believe one plan covers everything, then find a second account has fallen overdue and triggered firmer action.

Miss a payment and the plan can default

If you miss an agreed instalment, or you fail to keep your ongoing lodgements and new tax debts up to date, the payment plan can default. When a plan defaults, the full overdue balance becomes immediately payable and the ATO can move to firmer recovery action. For company directors, that can escalate to a director penalty notice, which makes you personally liable for certain company tax debts. A missed payment based on the false comfort that a credit had it covered is one of the more avoidable ways to end up there.

Should you change your payment plan when a credit lands?

This is the question clients ask me most, so let me share how I generally think about it. What follows is general guidance, not personal advice, but it is the framework I use.

Why I usually tell clients to keep paying

My default position is simple: do not vary or reduce your payment plan just because credits have been applied to the debt. If you can keep the payments going at the agreed level, do it. There are three good reasons.

• You clear the debt faster. The credit brings the balance down and your continued payments bring it down further, so you are debt free sooner.
• You pay less interest. Tax debts on a payment plan keep accruing the General Interest Charge, which compounds daily, so the quicker the balance falls, the less interest you hand over.
• You build goodwill and a buffer. A clean track record of meeting your arrangement matters if you ever need the ATO to work with you again, and clearing the debt early frees up cash flow for the things that actually grow your business.

If cash flow is genuinely tight

Sometimes keeping the payments going simply is not realistic. If cash flow is genuinely under pressure, you may be able to contact the ATO to cancel the existing plan and enter into a new arrangement with terms that suit your current position.

Be prepared, though: the ATO may ask for further information before agreeing to a new plan, such as financial statements and a budget or cash flow forecast showing what you can realistically afford. This is exactly the point where having your numbers in order pays off. A business with clean records and a credible forecast is in a far stronger position to negotiate than one scrambling to pull figures together. It is also where a Virtual CFO earns their keep, giving you the forward-looking numbers the ATO wants to see and the confidence to have the conversation.

Do not forget the General Interest Charge

One more reason to clear ATO debt quickly rather than let it sit: the General Interest Charge (GIC). GIC accrues on outstanding tax debts and compounds daily, so a debt that lingers costs you steadily more over time, even while you are on a payment plan.

There is also a significant change to be aware of. From 1 July 2025, the General Interest Charge is no longer tax deductible. Any GIC you incur on or after that date cannot be claimed as a deduction, even where the underlying debt relates to an earlier income year. That effectively makes carrying an ATO debt more expensive than it used to be, because you no longer get any tax benefit from the interest. You can read the detail on the ATO page covering denying deductions for ATO interest charges. For most business owners, this reinforces the same message: the sooner the debt is gone, the better.

The bottom line

Offsetting is not a penalty and it is not the ATO doing anything underhanded. It is simply how the system works: separate accounts, credits applied automatically against debts, and only the balance refunded to you. The problem is not the mechanism, it is being caught unaware by it, particularly if you were relying on a refund that never came or you assumed a credit had covered your next payment plan instalment.

The business owners who never get caught out are the ones who know their position across every ATO account before they lodge, keep their payment plans running on schedule, and have an advisor in the conversation before decisions are made rather than after. If you are carrying an ATO debt, expecting a refund, or thinking about how to structure your affairs to avoid these surprises in the first place, that is exactly the kind of proactive tax planning we do every day.

Why did I not get my tax refund from the ATO?

The most common reason is offsetting. If you had a debt on another ATO account, such as GST or PAYG on your Integrated Client Account, the ATO can automatically apply your income tax refund against that debt before paying you anything. It can also offset against debts previously placed on hold and against debts with other government departments. The ATO will notify you when it does this, and the movement will appear on your statement of account.

Can the ATO take my refund if I am on a payment plan?

It can, though there is some flexibility. The ATO is not required to offset where the debt is subject to a payment arrangement you are complying with, so it may still refund you in that situation if it considers it appropriate. It is not guaranteed, though, so if you are counting on a refund while on a plan, it is worth contacting the ATO before you lodge to understand what is likely to happen.

Does a credit reduce my payment plan instalments?

No. A credit or refund applied to your debt reduces the overall balance, but it does not replace your required instalment. You must keep making the agreed payments on schedule until the balance reaches nil. Skipping a payment because a credit was applied can cause the plan to default, which makes the full overdue balance immediately payable.

Can I pause or change my ATO payment plan?

A payment plan does not pause automatically. If your circumstances change and the current arrangement is no longer affordable, you may be able to contact the ATO to cancel the existing plan and set up a new one on different terms. The ATO may request further information first, such as financial statements and a budget, before agreeing to a new arrangement. Speak to your accountant before making any change so you go in with the right numbers.

Is the General Interest Charge still tax deductible?

No. From 1 July 2025, the General Interest Charge is no longer deductible. Any GIC incurred on or after that date cannot be claimed as a deduction, even if the underlying debt relates to an earlier year. Because GIC also compounds daily, carrying an ATO debt is now more expensive than it used to be, which is a strong reason to clear it as quickly as your cash flow allows.

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