ATO Just Increased Late Lodgement Penalties — Here’s the New Timeline and Consequences

By The Fine Print editorial team  |  Last updated: June 2026  |  10 min read  |  ⚠️ Not financial advice

The ATO can now charge you $1,565 for filing your tax return late — even if they owe you a refund. That’s the uncomfortable reality for the 2025–26 tax year. The penalty-unit value has risen over successive years, bringing the maximum FTL penalty for individuals to its highest level yet. And this year, the stakes went up further: a new “failure to correct” penalty framework took effect from 1 January 2026, the ATO is automating FTL assessments more frequently, and tax agents are warning that the era of the ATO quietly overlooking minor delays is over. Here’s exactly how the penalty system works, what triggers it, and how to stay off the ATO’s radar before 31 October 2026.

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The FTL Penalty Timeline — Exact Amounts by Days Overdue

The Failure to Lodge on Time (FTL) penalty is not a single fixed fine — it’s calculated in penalty units, with one unit charged per 28-day period (or part thereof) that the return is overdue. For 2026, one penalty unit equals $313. The penalty caps at five units for individual taxpayers, giving a maximum of $1,565 per late return. ^[1][3][4][5]For context, the maximum FTL penalty for individuals was approximately $900 in earlier years, rose to around $1,050, then to $1,320 in some period examples, and is now $1,565. The consistent direction is upward, and there is no reason to expect it to reverse. ^[3][4][1]

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General Interest Charge — The Cost of Unpaid Tax

Separate from FTL penalties, the ATO charges General Interest Charge (GIC) on any tax that remains unpaid from the original due date. For April–June 2026, the GIC rate is 10.96% per annum, compounding daily. Unlike the fixed FTL penalty structure, GIC accumulates continuously until the debt is paid. ^[5][6]

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How Penalties Stack Across Multiple Unlodged Years

FTL penalties are assessed per return, not per taxpayer. If you have three years of unlodged returns — a situation that is more common than you might expect, given that the ATO estimates hundreds of thousands of returns go unlodged each year — you can face up to three separate FTL penalties, each as high as $1,565. That’s up to $4,695 in FTL penalties alone, before GIC on the underlying debts. ^[3][4][1]The situation compounds further if the ATO issues a default assessment — where the ATO estimates your taxable income and issues a tax bill in the absence of a return. Default assessments are often set high, and the GIC starts running from the original due date. Disputing a default assessment while simultaneously owing penalties and interest creates a difficult financial and administrative position. ^[4][9]

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Late Lodgement as an Audit Trigger

Beyond the direct financial penalties, tax agents and accounting firms in 2026 are consistently warning clients that late or non-lodgement has become a behavioural red flag in ATO risk profiling. The ATO’s data-matching systems receive information from employers (income statements), banks (interest), share registries (dividends), rental bond authorities and exchanges (crypto). When that data shows income for a given year but no return has been filed, the ATO flags the taxpayer for follow-up — and the follow-up typically involves a closer look at not just the missing year, but prior years and specific deduction categories. ^[6][11]In 2026, CPA Australia and AI-driven analytics platforms note that the ATO’s ability to identify anomalies across millions of returns has improved significantly. The practical effect: the window between non-lodgement and ATO contact is shorter than it used to be. ^[9][6]

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The New Failure-to-Correct Penalty From 1 January 2026

ATO legislation guidance from May 2025 outlines changes to “strengthen penalty and shortfall interest charge provisions.” From 1 January 2026, a new failure-to-correct penalty framework applies. Where ATO data-matching identifies a discrepancy in a lodged return — under-reported income, over-claimed deductions — and the taxpayer has not voluntarily corrected the return within a specified window, the ATO can apply shortfall penalties starting at 25% of the tax shortfall, rising to 50% where reasonable care is not demonstrated. ^[11][12]These shortfall penalties are in addition to any FTL penalties and are separate from GIC. The combined exposure — FTL penalty, GIC on the underlying debt, and shortfall penalty on the discrepancy — can quickly make a small compliance gap an expensive problem. ^[11][12][6]

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The Tax Agent Extension — And Who Doesn’t Qualify

The ATO’s Registered Agent Lodgment Program gives clients of registered tax agents extended due dates — often to 15 May, with a concessional FTL “safe harbour” if returns and associated payments are made by 5 June. This is widely used and genuinely useful. But there is a critical condition: to be eligible for the extension, you must have no outstanding prior-year returns. ^[8][7][9]If you have any return listed as “not lodged” in your myGov/ATO Online account for years prior to 30 June 2025, you are not eligible for the 2025–26 extension — even if you sign up with a tax agent tomorrow. Your 2025–26 return (and all outstanding prior years) are due by 31 October 2026, regardless. Accountants Daily warned of exactly this scenario in October 2025, noting that “no compliance, no extension” is the ATO’s current operating policy. ^[9][8][7]

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✅ Three Actions to Take Before 31 October

Action 1: Lock in your lodgement status before the ATO writes first

For your 2025–26 return: treat 31 October 2026 as a firm deadline if you self-lodge. If you use a tax agent, confirm you are on their 2025–26 lodgement list now — and confirm you have no outstanding prior-year returns, which would remove your eligibility for any extension. If you are already late on the current or any prior year, the right move is to lodge (or engage an agent to lodge) before the ATO sends a reminder or default assessment. Tax agents consistently report that FTL penalties are more likely to be remitted when the taxpayer acts voluntarily, before ATO contact. ^{[8][7][9][5][6]}

Action 2: Check your myGov account for outstanding prior-year returns and clear them

Log into myGov, navigate to the ATO section, and check your tax return history for any years listed as “not lodged.” If any appear, prioritise lodging them — even before the current-year return if necessary. Each unlodged year is a separate FTL exposure of up to $1,565. Clearing outstanding years also restores your eligibility for the tax agent extension program, which may matter for 2026–27 planning. If the unlodged years have significant income, consider engaging a tax agent rather than self-lodging, as they can negotiate with the ATO on penalty remission as part of the lodgement process. ^{[10][5][4][9]}

Action 3: If you’ve discovered an error in a past return, act now using voluntary disclosure

If your own review, or the use of a crypto tax tool, or a look at prior year bank statements reveals that you’ve under-reported income or over-claimed deductions in a past return, the most cost-effective response is voluntary disclosure before any ATO contact and before the failure-to-correct deadline closes. Amend the return via myGov (for recent years) or through your tax agent. Doing this proactively can reduce shortfall penalties from 25–50% of the shortfall down to a fraction of that, and may result in FTL penalties being partially or fully remitted. The ATO’s “correct it before we find it” policy is explicit in current guidance — the voluntary disclosure pathway exists precisely for this scenario. ^{[11][12][5][6]}

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❓ Frequently Asked Questions

What is the ATO late lodgement penalty in 2026?

$313 per penalty unit, one unit per 28 days overdue, maximum 5 units = $1,565 per return. Non-deductible. ^[1][3][4][5]

Am I charged even if the ATO owes me a refund?

Yes — FTL penalties apply regardless of whether you have a debt or a refund owing. A $400 refund with a 60-day late lodgement can become a $226 net payment to the ATO. ^[1][3][10]

What is the GIC rate in 2026?

10.96% per annum compounding daily for April–June 2026. Runs from the original due date until the debt is paid. ^[5][6]

What is the failure-to-correct penalty?

From 1 January 2026 — 25% of the tax shortfall if the ATO finds a discrepancy you haven’t corrected; rising to 50% for lack of reasonable care. On top of FTL and GIC. ^[11][12]

Can I get a tax agent extension?

Only if you have no outstanding prior-year returns. If any years show “not lodged” in your ATO account, your 2025–26 return is due 31 October regardless. ^[8][9]

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📚 Sources & References

1. Yahoo Finance AU, “Only days left to avoid possible $1,650 penalty as tax deadline looms,” au.finance.yahoo.com/news/only-days-left-to-avoid-possible-1650-penalty-as-tax-deadline-looms-213018444.html
2. YouTube (ATO explainer reference), youtube.com/watch?v=m-1D5aDkWhM
3. etax, “ATO late lodgement penalty,” etax.com.au/ato-late-lodgement-penalty/
4. Nanak Accountants, “Tax return due dates,” nanakaccountants.com.au/blog/tax-return-due-dates/
5. AusTax Tools, “Tax return deadline Australia 2026,” austax.tools/tax-insights/tax-return-deadline-australia-2026/
6. Seed Accounting, “Client update March 2026,” seedaccounting.com.au/client-update-march-2026/
7. ABC News, “Tax return deadline 2025,” abc.net.au/news/2025-10-01/tax-return-deadline-2025/105820288
8. ATO, “Registered agent lodgment program 2025–26 due dates June 2026,” ato.gov.au/tax-and-super-professionals/for-tax-professionals/prepare-and-lodge/registered-agent-lodgment-program-2025-26/due-dates-by-month/june-2026
9. Accountants Daily, “No compliance, no extension — accountant warns late lodgers as 31 Oct deadline looms,” accountantsdaily.com.au/business/21871-no-compliance-no-extension-accountant-warns-late-lodgers-as-31-oct-deadline-looms
10. Clean Slate, “ATO tax deadlines 2026,” cleanslate.net.au/insights/blogs/ato-tax-deadlines-2026/
11. ATO, “Strengthen penalty and shortfall interest charge provisions,” ato.gov.au/about-ato/new-legislation/in-detail/businesses/strengthen-penalty-and-shortfall-interest-charge-provisions
12. YouTube (failure to correct explainer reference), youtube.com/watch?v=0-Zr_bOkedA

This article is general information only and does not constitute financial or tax advice. Penalty amounts and interest rates are based on ATO guidance current as at June 2026 and are subject to change. Your specific penalty exposure depends on your lodgement history and circumstances. Consult a registered tax agent for advice tailored to your situation. The Fine Print 🇦🇺 is not affiliated with the ATO or any firm mentioned.