What it means
Tax is charged year by year, but business results do not respect the calendar. A carryback smooths that out by letting a loss-making year reach back into a profitable one, recalculating the earlier year's tax and refunding the difference.
The claim is usually made through the current return or an amended return for the earlier period. The attraction for a finance director is cash timing.
A loss carried forward is worth something only when the business returns to profit, whereas a carryback can put money in the bank within months, which is why governments often extend carryback periods during recessions. The mechanics are straightforward.
You take the loss, apply it against the earlier year's taxable profit, recompute the tax for that year at the rate then in force, and claim the difference between the tax originally paid and the tax now due. The refund is capped both by the profit available in the carryback year and by any statutory limit on the amount that can be carried back.
Rules vary widely between countries and change often. Some regimes allow one year, some allow several, some suspended carrybacks entirely and later reinstated them temporarily, and many restrict which types of loss qualify.
Because the tax rate in the earlier year may differ from today's rate, the value of a carryback also depends on which year the loss lands in. The accounting treatment differs from a carryforward in a helpful way.
A carryback claim is recognised as a current tax receivable because the refund is essentially certain, while a carryforward creates a deferred tax asset that must be tested against the likelihood of future profits.
In practice
Real-world examples.
Example
A machine tool maker has a bad year after a major customer collapses. It carries the loss back against the previous year's profits and receives a $240,000 refund, which covers three months of payroll while the sales team rebuilds the order book.
Example
A hotel operator that had been consistently profitable records a large loss following a forced closure. Its accountant files an amended return for the prior year, and the resulting refund removes the need to draw on the group overdraft facility.
Example
A construction firm makes a loss on a single fixed-price contract that pushes the whole year into the red. Because the carryback is limited to one year and the prior year's profit was small, only part of the loss produces a refund and the balance is carried forward.
Formula
Calculation
Tax Refund = (Earlier Year Taxable Income x Tax Rate) - ((Earlier Year Taxable Income - Loss Carried Back) x Tax Rate)
A packaging business reported taxable income of $800,000 two years ago and paid tax at 21%, so the tax paid was $800,000 x 21% = $168,000. This year it makes a trading loss of $500,000, and the rules in force allow a two-year carryback.
Revised taxable income for the earlier year = $800,000 - $500,000 = $300,000. Tax now due for that year = $300,000 x 21% = $63,000.
Refund = $168,000 - $63,000 = $105,000, which is simply $500,000 x 21%. The whole loss has been absorbed, so nothing remains to carry forward. Had the loss been $1,000,000 instead, only $800,000 could have been carried back, giving a refund of $800,000 x 21% = $168,000 and leaving $200,000 to carry forward.Case study
Seen in the real world.
Ridgeway Textiles is an illustrative, invented mill business used to show how a carryback works in practice. In its most recent financial year it reported a trading loss of $450,000 after a fire closed one of its two production lines for four months.
The previous year had been a good one, with taxable income of $700,000 taxed at 21%, giving tax paid of $700,000 x 21% = $147,000. Carrying the loss back reduced that year's taxable income to $700,000 - $450,000 = $250,000 and the tax due to $250,000 x 21% = $52,500, producing a refund of $147,000 - $52,500 = $94,500.
In this fictional example the refund arrived four months after the claim and was used to fund the deposit on replacement machinery. The finance director noted afterwards that the carryback had been worth far more than the same relief carried forward, because the business needed cash during the recovery rather than a lower tax bill two years later.
Watch out
Common mistakes.
- Assuming a carryback is always available, when many tax regimes restrict or suspend it and some allow no carryback at all for ordinary trading losses.
- Forgetting that the refund is limited by the profit reported in the earlier year, so a loss larger than that profit cannot be fully recovered.
- Recognising the expected refund in the accounts before checking the deadline for amending the earlier year's return, which in many jurisdictions is strict and unforgiving.
Questions
People also ask.
How is a carryback different from a carryforward?
A carryback applies the loss to profits already taxed and generates a refund, whereas a carryforward applies it to future profits and reduces a future tax bill.
Does a carryback always give the best result?
Not always, because if tax rates are due to rise, carrying the loss forward may be worth more even though the cash arrives later.
What documentation is needed?
Generally the loss computation, the original and revised returns for the earlier year, and evidence that the loss is a trading loss of the type the rules allow to be carried back.
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