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That means the first benefit arrives when 2027–28 tax returns are lodged from July 2028, and only for people who pay enough tax on their work income to use it. As the government promotes the offset, the mechanics matter.

With millions of Australians still finalising 2025–26 returns ahead of the October deadline, messages about income statements and payments look routine, and that is exactly what makes them dangerous.

It matters now because the new settings apply to income earned this financial year, with the 2026–27 repayment worked out when returns are lodged from July 2027. For many early-career workers, it means a smaller repayment, or none at all.

For people without private hospital cover whose income sits just above last year's line, that could mean no surcharge at all for 2026–27. For those with cover, it may mean a larger rebate on premiums.

The warning, in the PBO's 2026–27 Medium-Term Budget Outlook released on 14 July, has become a flashpoint in Canberra. It is fuelling Coalition calls to index tax brackets and raising questions about how long legislated tax cuts can offset the drift.

The figures offer a useful snapshot of how Tax Time 2026 is unfolding, with the self-lodger deadline approaching and the ATO sharpening its focus on overclaimed deductions, missing income and misinformation.

This is not a proposal waiting on Parliament. The change sits in Schedule 1 of the Treasury Laws Amendment (Tax Reform No. 1) Act 2026, which passed the Senate on 25 June 2026 and received Royal Assent the next day.