What it means
When a business spends more than it earns in a year, the tax authority does not send a refund for the loss. Instead, many tax systems let the company keep a running balance of that loss and deduct it from profits earned in future years.
That balance is the net operating loss carryforward, often shortened to NOL. This matters most for start-ups, turnaround businesses and cyclical industries, where early or bad years are followed by better ones.
A company that loses $400,000 in its first year and then earns profits is taxed as if it had earned only the net amount over the longer period. Without the carryforward, the business would pay tax on the good years and get nothing for the bad ones.
In practice the loss is applied against the oldest available profit first, and any unused balance rolls on to the next year. Rules differ by country and change over time, so there may be a cap on how much of each year's profit the loss can offset, or a limit on how many years the balance survives.
Always check the current local rules rather than assuming an unlimited shelf life. Finance teams record the future tax saving as a deferred tax asset (an amount expected to reduce tax bills later).
Auditors then ask whether the company will realistically earn enough profit to use it, and if not, the asset is written down. That judgement can move reported profit noticeably.
There is one important nuance in deals and fundraising. Many tax systems restrict the use of a loss balance after a major change in ownership, so a buyer cannot simply purchase a loss-making shell to wipe out its own tax bill.
Anyone valuing a company with large accumulated losses should ask what survives a sale.
In practice
Real-world examples
Example 1
A software start-up loses $1,200,000 while building its product and signing its first customers. In its fourth year it makes a $500,000 profit and pays no tax on it because of the carried loss. The founders include the remaining balance in their cash forecast for the following years.
Example 2
A seasonal building contractor has a poor year after a long wet spell and records a $150,000 loss. The next year is strong, and the carryforward reduces the taxable profit by the same amount. The owner uses the saving to pay down equipment finance.
Example 3
An investor is evaluating a retailer that has accumulated $3,000,000 of losses. Before putting any value on the tax asset, her adviser confirms how much of it would survive a change of ownership. The offer price is set well below what the headline figure would suggest.
Think of it
Imagine you are climbing a steep hill and slip backwards, sliding down a few metres. Instead of starting from scratch, a checkpoint saves your progress. When you climb again, you do not have to redo the bottom section from zero; you pick up where your efforts left off.
Formula
Calculation
Tax saved = NOL used x tax rate
Suppose a company loses $400,000 in Year 1, earns $250,000 in Year 2 and earns $300,000 in Year 3, with a tax rate of 25% and no cap on the offset. In Year 2 it uses $250,000 of the loss, so taxable profit is $0 and the tax saved is 250,000 x 25% = $62,500. The remaining loss is 400,000 - 250,000 = $150,000, which it uses in Year 3, so taxable profit falls from $300,000 to $150,000 and the tax saved is 150,000 x 25% = $37,500. Total tax saved across both years = 62,500 + 37,500 = $100,000, which equals the full $400,000 loss x 25%.Case study
Seen in the real world
Marlowe Trails Ltd is a fictional outdoor equipment retailer used here for illustration. It lost $600,000 over its first two years while building a loyal online customer base, and its accountant recorded the full amount as a loss balance to carry forward.
In its third year the company earned a profit of $380,000, and in its fourth a profit of $420,000. The loss balance wiped out the third-year taxable profit completely and covered the remaining $220,000 in year four, so the company paid tax on only $200,000 that year.
The illustrative lesson is that the saving only materialised because the company kept clean records and filed its returns on time. The management team now reviews the balance every quarter, so no one is surprised by a lapse or a restriction.
Watch out
Common mistakes
- Treating the loss as cash in the bank, when it only reduces future tax and has no value if the company never becomes profitable.
- Assuming the balance lasts forever, when many tax systems limit the number of years or the share of profit it can offset.
- Assuming the losses transfer fully to a buyer, when ownership changes can restrict or remove the right to use them.
Questions
People also ask
Is a carryforward the same as a carryback?
No, a carryforward applies the loss to future profits, while a carryback applies it to earlier years to claim a refund of tax already paid, and not every system allows it.
Does an NOL appear on the balance sheet?
Only as a deferred tax asset, and only if the company judges it likely to earn enough future profit to use it.
Who decides how much loss can be used each year?
The tax rules of the relevant country set the limits, so a local tax adviser should confirm the figures before they are put into a forecast.