Loss Carry-Back Tax Offset: How Australian Companies Can Reclaim Tax Paid in Prior Years

Last reviewed against current ATO guidance: 10 Nov 2026. Always confirm current thresholds, rates, and dates at ato.gov.au.

When a business goes from profitable to loss-making, the natural question is: "What do we get back?" For Australian companies, the loss carry-back tax offset can provide real cash relief — not just a deferred tax asset sitting on a balance sheet, but an actual refundable offset against income tax already paid. Understanding the mechanics is essential for any accountant or bookkeeper advising company clients.

Who Is Eligible?

The carry-back offset is available exclusively to companies — sole traders, partnerships, and trusts are excluded. To claim, a company must:

• Be an Australian resident company (or a foreign company with a permanent establishment in Australia)
• Have had an income tax liability in the year they want to carry back to (i.e., they paid tax in a prior profitable year)
• Have an aggregated turnover of under $5 billion (effectively all but the largest multinationals)
• Lodge a tax return for the loss year

The offset was introduced for the 2020–21 income year and has been extended through subsequent years. For the 2024–25 income year, the ATO confirmed the measure continues to apply, so companies making losses in the current cycle can still access it — but verify with the ATO's most current legislative instruments, as extension status can shift with each budget.

Importantly, the offset is only available via the company tax return — it cannot be claimed mid-year or through the PAYG instalment system.

The $1 Million Cap on Carry-Back Losses

There is a dollar limit that trips up many advisers. The maximum tax offset a company can claim in any one year is capped at the lesser of:

1. The company's income tax liability in the carry-back year (you can't get back more than you paid)
2. The company's franking account balance at the end of the loss year (see below)
3. Tax on $1 million of losses carried back — meaning the offset cannot exceed $250,000 for a base rate entity (25% rate) or $300,000 for a company on the 30% rate

The $1M cap applies to the quantum of losses being carried back, not the dollar offset itself. A company with $3 million in losses cannot carry back more than $1 million worth in a single year. Excess losses fall into the ordinary carry-forward pool.

The Franking Account Constraint

This is the detail most often missed. The carry-back offset is limited to the company's closing franking account balance at the end of the loss year. This prevents companies from claiming a cash refund that would exceed the franked distributions they could support — effectively stopping double-dipping where a company both pays no tax and retains franking capacity.

In practice, if a company has a small or zero franking account balance at year end — perhaps because it distributed most of its franked dividends — the carry-back offset may be significantly reduced or eliminated regardless of prior tax paid. When modelling carry-back positions, always pull the franking account balance first. Companies should also consider whether any interim distributions before year-end might inadvertently reduce the franking balance and limit carry-back access.

How to Claim on the Company Tax Return

The offset is claimed at label T4 — Tax offset for loss carry back on the company tax return. The ATO's return includes a worksheet to calculate the offset amount, stepping through the three caps described above.

Your workflow should be:

1. Confirm the company has a current-year tax loss (net loss after all adjustments)
2. Identify the carry-back year(s) — losses can be carried back up to two years prior
3. Pull prior year notices of assessment to confirm the actual tax liability paid
4. Check the closing franking account balance at 30 June of the loss year
5. Calculate the offset using the ATO worksheet
6. Lodge the company return with the T4 label completed — the offset will reduce the tax payable or generate a refund

The ATO generally processes carry-back offset refunds within 14–28 days of lodgement, though complex returns may take longer.

Interaction With Prior Year Losses and PAYG Instalments

Companies that have already paid PAYG instalments for the loss year will have those instalments credited in the normal way before any carry-back offset is applied. The carry-back offset then applies to the remaining liability — or generates a refund if the instalments plus offset exceed the tax payable.

Note that the carry-back measure does not affect how prior year losses are tracked. If only part of a loss is carried back (due to the $1M cap), the remainder is available as a carry-forward loss in future profitable years. Both positions can coexist — partial carry-back, partial carry-forward.

Bookkeeping and Reporting Implications

From a bookkeeping perspective, the carry-back offset creates a receivable — an income tax refund expected from the ATO. This should be recognised as a current asset once the return is lodged and the refund is reasonably certain. Under AASB 112, companies following Australian accounting standards may also need to assess whether the carry-back changes their deferred tax asset position (it typically reduces or eliminates a deferred tax asset for the same losses).

For practices using ReconLink, tagging the ATO refund receivable with the correct account code (typically under tax assets or other receivables) keeps the reconciliation clean and ensures the cash receipt when it arrives matches cleanly to the outstanding item.

Carry-back is one of the more shareholder-friendly tax concessions in the Australian system. Identifying eligible company clients early — particularly those who had strong profits in 2022–24 and are now facing headwinds — can deliver real value at return time.