What it means
A carryforward exists because taxing each year in isolation would penalise businesses with uneven results. A company that loses $900,000 in one year and makes $900,000 the next has broken even overall, and the carryforward is the mechanism that brings the tax bill closer to that economic reality.
Many jurisdictions now allow losses to be carried forward indefinitely rather than for a fixed number of years. For a growing company, the balance of carried-forward losses can be one of its most valuable assets.
Early-stage businesses that spent heavily before revenue arrived often pay little tax for years after they turn profitable, because the accumulated losses shelter their first profits. The catch in most modern regimes is an annual restriction.
Rather than wiping out a profitable year entirely, a company may only offset a set percentage of taxable income, commonly around 80%, so some tax is always paid. Whatever is not used simply stays in the pool for later years.
Ownership change rules are the other trap. Many jurisdictions restrict or cancel carried-forward losses when a company changes hands or substantially changes its trade, precisely to stop loss pools being bought and sold.
Buyers therefore price those losses cautiously and diligence teams check the history carefully. In the accounts, a carryforward creates a deferred tax asset, but only if management can show that future taxable profits are probable.
Where that evidence is weak the asset is not recognised, which is why loss-making companies frequently disclose large unrecognised losses in the tax note.
In practice
Real-world examples.
Example
A biotechnology business accumulates $12,000,000 of losses over eight years of research. When its first product licence generates profit, those losses shelter most of the early income and the company pays only a modest tax charge for several years.
Example
A restaurant group closes half its sites after a difficult year and records a large loss. As trade recovers, the carried-forward losses reduce its tax payments for the next three years, improving cash flow while it reinvests in the remaining sites.
Example
An acquirer reviewing a target with $5,000,000 of carried-forward losses discovers that local rules cancel loss relief when ownership changes and the trade is restructured. The buyer removes the value it had attributed to those losses from its offer.
Formula
Calculation
Offset Limit = Current Taxable Income x Allowed Percentage
Taxable Income After Losses = Current Taxable Income - Lesser Of (Available Losses, Offset Limit)
A software company carries forward $900,000 of losses from its development years. The following year it reports taxable income of $1,000,000, and the rules allow losses to shelter up to 80% of taxable income.
Offset limit = $1,000,000 x 80% = $800,000. Available losses of $900,000 exceed that limit, so only $800,000 can be used this year.
Taxable income after losses = $1,000,000 - $800,000 = $200,000, and tax at 21% = $200,000 x 21% = $42,000. Without the carryforward the bill would have been $1,000,000 x 21% = $210,000, so the saving is $210,000 - $42,000 = $168,000. The unused balance of $900,000 - $800,000 = $100,000 remains available for future years.Case study
Seen in the real world.
Pallister Analytics is a fictional data services company used here as an illustrative example of how a loss pool behaves. Over its first four years it spent heavily on product development and accumulated tax losses of $2,400,000, none of which had been recognised as a deferred tax asset because profitability remained uncertain.
In year five the company signed three large enterprise contracts and reported taxable income of $1,500,000. With an 80% restriction, the offset limit was $1,500,000 x 80% = $1,200,000, so taxable income after losses was $1,500,000 - $1,200,000 = $300,000 and tax at 21% came to $63,000. The remaining loss pool stood at $2,400,000 - $1,200,000 = $1,200,000.
Because the contracts were multi-year and profits were now clearly foreseeable, the auditors agreed in this illustrative scenario that a deferred tax asset could finally be recognised on the remaining losses. Recognising $1,200,000 x 21% = $252,000 produced a one-off credit in the income statement, which the board took care to explain to investors as an accounting event rather than trading performance.
Watch out
Common mistakes.
- Assuming carried-forward losses will wipe out the next profitable year entirely, when annual restrictions mean some tax is usually payable regardless.
- Recognising a deferred tax asset on losses without credible evidence of future profits, which auditors routinely challenge and which can require reversal later.
- Ignoring change-of-ownership rules during a sale process, and only discovering during diligence that the loss pool the seller was pricing has effectively been forfeited.
Questions
People also ask.
How long can losses be carried forward?
It depends on the jurisdiction, with many now allowing an indefinite carryforward while others impose limits of anywhere from five to twenty years.
Are carried-forward losses shown on the balance sheet?
Only indirectly, as a deferred tax asset when future profits are probable, otherwise they appear as an unrecognised amount disclosed in the tax note.
Can losses be used against any kind of income?
Not always, since many regimes ring-fence losses by activity, so a trading loss may not be available against capital gains or investment income.
From the founder's library
Take it further with the book.
Build your financial confidence beyond this definition. Shihan's full-length guide, Accounting Fundamentals, takes the same plain-English approach and turns it into a complete, practical playbook for non-finance managers, business owners and students - with chapter-end quiz answers and presentation slides included.
25% off with code MMHQ25, applied at checkout. Priced in USD - checkout may show the equivalent in your local currency.
View the book and save 25%Related