Highlights

  • The ATO is contacting taxpayers and tax agents where PAYG instalments have been repeatedly varied to nil across multiple years.
  • The activity is better described as targeted compliance contact and education rather than a blanket enforcement crackdown.
  • PAYG variations should reflect a reasonable estimate of the taxpayer's expected tax position and be supported by current information.
  • General interest charge consequences can arise where instalments are materially underestimated, and the charge has been non-deductible since 1 July 2025.

The Australian Taxation Office is contacting taxpayers and tax agents who have repeatedly varied their pay-as-you-go (PAYG) instalments to nil, reinforcing that variations need to be realistic and supportable.

While the activity may attract attention as a compliance crackdown, the ATO's September 2026 guidance frames it more precisely as targeted contact aimed at reinforcing fair and consistent administration of the PAYG instalment system.

That distinction matters. A properly supported nil variation is not automatically problematic, but a repeated pattern of nil variations that does not align with the taxpayer's actual tax position can attract scrutiny.

What the ATO is doing

The ATO has said it is contacting taxpayers, or their registered tax agents, where PAYG instalments have been varied to nil across multiple years.

The purpose is to remind taxpayers of their obligations when making variations and encourage more accurate estimates.

PAYG instalments are intended to prepay part of a taxpayer's expected annual income tax liability.

Where a taxpayer consistently reduces those instalments to nil but subsequently has a material tax liability, the pattern may suggest that the variations did not properly reflect the expected position at the time they were made.

The general interest charge risk

One of the main financial consequences of understating PAYG instalments is potential exposure to the general interest charge.

Where a variation produces instalments that are materially lower than the amount that should have been paid under the relevant rules, interest consequences can arise.

That means a nil variation that later proves substantially inaccurate can cost more than simply leaving the taxpayer with a balancing amount at year-end.

The cost has also become more significant because general interest charge amounts incurred from 1 July 2025 are no longer tax deductible.

Taxpayers should therefore consider both the immediate cash-flow benefit of reducing an instalment and the potential cost if the estimate proves materially too low.

Variations must be substantiated

The ATO's central message is that PAYG instalment variations should be based on information that is reasonable, current and capable of being substantiated.

A variation to nil may be appropriate where the taxpayer genuinely expects their relevant tax Liability to fall to nil or to a sufficiently low level.

That might occur because of a Business downturn, Investment losses, a substantial change in income-producing activity or other changes affecting taxable income.

However, the estimate should be supported by evidence such as current management accounts, updated forecasts, investment income information or other relevant records.

Repeatedly selecting nil without reconsidering the taxpayer's current position is the type of behaviour the ATO is seeking to address.

Who may be affected

The guidance is most relevant to taxpayers with a history of repeated nil PAYG instalment variations and the tax agents who lodge those variations on their behalf.

Businesses with volatile profits and investors whose income changes materially from year to year may legitimately need to vary instalments more frequently.

The issue is not Volatility itself.

Rather, the question is whether each variation was reasonable based on the information available when it was made.

Tax agents should therefore be particularly careful where clients routinely request nil variations without providing updated financial information.

What to consider next

Taxpayers should review their PAYG instalment position against their current expected income and tax liability rather than relying on a previous variation automatically.

Relevant information can include:

  • year-to-date business profits or losses;
  • investment income;
  • realised and expected capital gains or losses;
  • deductions and tax offsets; and
  • material changes in trading or investment activity.

Where circumstances change during the year, taxpayers can reconsider the variation instead of allowing an outdated estimate to continue.

Records supporting the calculation should also be retained.

Contact and education, not a blanket crackdown

It is useful to distinguish the ATO's current activity from a general penalty campaign.

The ATO describes the initiative as contacting taxpayers and agents who have repeatedly varied PAYG instalments to nil and reminding them of their obligations.

That is targeted compliance activity rather than evidence that every nil variation will be challenged.

A taxpayer who reasonably expected no relevant tax liability and can substantiate that position may have a legitimate basis for varying to nil.

What increases risk is a repeated pattern that does not correspond with actual income or tax outcomes and cannot be supported by contemporaneous records.

Why repeated nil variations attract attention

PAYG instalments are designed to keep tax payments reasonably aligned with income as it is earned.

If a taxpayer repeatedly reduces instalments to nil and then consistently reports substantial tax liabilities, the instalment system is no longer performing that function.

That can leave the taxpayer with larger year-end liabilities and may also raise questions about whether previous variations were reasonable.

For tax agents, repeated nil variations may therefore Warrant an additional review rather than being treated as a routine administrative request.

How to stay on the right side of the rules

The practical approach is to treat every PAYG variation as an estimate that should be capable of explanation.

Taxpayers should use current information, document their assumptions and revisit the estimate if circumstances materially change.

A nil variation should not be viewed as inherently wrong, nor should it be used automatically whenever income is uncertain.

Where the tax position is difficult to estimate, the focus should be on producing the most reasonable current forecast available and retaining the workings behind it.

For tax agents, proactively reviewing clients with a history of repeated nil variations may help identify cases where instalments no longer reflect the underlying tax position.