The newly legislated Tax Loss Carry Back offset, passed in August 2026 under the Treasury Laws Amendment (Tax Reform No. 2) Act 2026, allows eligible companies to claim a cash refund for taxes paid in the previous two years against current-year revenue tax losses (net capital losses are excluded). Effective from 1 July 2026 for the 2026–27 income year, this permanent measure converts tax losses into an immediate cash injection rather than requiring businesses to carry them forward to future profitable years. This article breaks down the new offset rules, contrasts them with the previous system, and outlines exactly how finance teams should prepare to maximise cash flow.

Key Rules & Eligibility: How the Permanent Tax Loss Carry Back Works

The newly legislated tax loss carry back rules allow eligible companies to offset their 2026–27 tax losses against corporate tax paid in 2024–25 and 2025–26.

Eligibility

To be eligible, the loss-making entity must be a corporate tax entity that is not a Significant Global Entity (SGE) — generally requiring an aggregated annual global turnover of less than $1 billion.

Permanent Status and Crucial Refund Caps

Claims are strictly capped against three key metrics:

• Tax value of the loss: The offset cannot exceed the tax value of the eligible revenue loss, calculated using the company's corporate tax rate for the loss year (e.g., 25% for Base Rate Entities).

• Prior tax liabilities: The refund cannot exceed the total corporate income tax actually paid across the previous two income years.

• Franking account balance: The refund cannot exceed the entity's franking account balance at the end of the claim year. This franking cap acts as a built-in integrity measure: if a company has already distributed profits and attached franking credits to dividends, it cannot subsequently claim a cash refund for that same underlying tax.

Strategic Choice: Carry Back vs Carry Forward

Applying for the offset is entirely optional. Finance teams must make an active choice whether to carry the loss back for an immediate cash injection or carry it forward to offset anticipated future profits.

Why the Permanent Tax Loss Carry Back Was Reintroduced: Modernising Corporate Resilience and Cash Flow Optimisation

Announced in the 12 May 2026 Federal Budget, the permanent reintroduction of the Tax Loss Carry Back scheme aims to support business risk-taking and bolster economic resilience. By granting rapid access to liquidity, the measure provides immediate balance sheet relief to viable companies facing temporary market downturns.

Australia has experimented with this tax mechanism twice in recent history. It was first enacted for the 2012–13 income year before being repealed in 2014. It later returned as a temporary COVID-19 relief policy, allowing companies to offset losses incurred across the 2019–20 to 2022–23 income years against tax paid in earlier profitable years. However, both previous iterations were temporary interventions designed to address short-term crisis periods.

Unlike previous temporary crisis measures, embedding the offset permanently into the corporate tax system provides ongoing balance sheet certainty. Finance teams can strategically treat prior tax paid as an accessible liquidity buffer during cyclical downturns, supporting working capital or expenditure without waiting for future profitable years.

Key Dates & Compliance Timeline for 2026–27 Claims

The table below outlines the critical compliance and planning deadlines for managing loss projections, franking account balances, and ATO lodgment windows from late 2026 through the 2027 tax return filing season.

4 Immediate Actionable Steps: What Finance Teams Need to Prioritise Right Now

To take full advantage of the Tax Loss Carry Back scheme, preparation must begin well before the end of the financial year. Finance and operations teams should focus on the following four priorities to ensure eligibility and streamline the claim process:

• Verify past tax paid and your franking account balance:

  Precisely calculate your franking credits. The available balance in your franking account at the end of the income year in which you make the claim acts as a strict cap on your maximum potential refund.

• Conduct a 5-year lodgment compliance audit:

  Self-check your company's tax lodgment history. A mandatory ATO eligibility condition for claiming the carry back offset is that your business must have lodged its income tax returns for the current year and the previous five income years. Any outstanding returns will block the claim.

• Reassess cash flow forecasts:

  Incorporate potential cash refunds into your short- and medium-term planning. Knowing a refund is available can alter how you approach capital expenditure approvals or debt reduction strategies.

• Organise documentation and review compliance:

  Ensure your internal systems accurately track the corporate tax rate applicable to your business in the loss year (25% for Base Rate Entities or 30% for standard corporate entities). Prepare all calculated schedules and supporting evidence for your 2026–27 tax return in consultation with your registered tax agent.

The newly permanent Tax Loss Carry Back offset is a critical tool to revitalise cash flow, offering significant relief if your business faces a challenging financial year. It fundamentally changes the calculation from simply carrying a loss forward to actively using past tax contributions as a liquidity buffer.

However, correctly calculating the offset, applying the correct corporate tax rates, and managing franking account limits requires careful preparation. As specific eligibility rules and compliance requirements can be complex, we strongly recommend consulting your registered tax agent or accountant before finalising your next tax return.

Official sources:

• ATO — Tax reform – tax loss carry back

• ATO — Tax loss carry back law now passed

• ATO — How to claim the tax offset

• Ministers' Treasury portfolio — Backing small businesses with tax relief