Understanding UK Corporation Tax Loss Relief
When a company incurs losses, understanding the reliefs available can help reduce future tax liabilities and improve cash flow. UK corporation tax rules provide a range of options depending on the type of loss and the company’s circumstances.
Relief for Trading Losses
Where a company makes a trading loss, the following options are available:
1. Carry the Loss Forward Against Future Trading Profits
A trading loss can be carried forward and offset against future trading profits.
This option may provide future tax savings, and businesses should consider whether a deferred tax asset should be recognised in the financial statements where recovery of the losses is probable.
2. Offset Against Total Profits of the Same Accounting Period
A company may claim to offset the trading loss against the total profits of the same accounting period.
If the loss exceeds total profits for that period, the unrelieved balance may then be carried forward.
3. Current Year Relief and Carry Back
A company can first offset the loss against the total profits of the current accounting period, then carry back any remaining loss against the total profits of the previous 12 months.
This can create a cash repayment of corporation tax previously paid, which may be valuable for short-term cash flow.
However, where corporation tax rates have increased, it may be more beneficial to preserve losses for future periods, where they may generate relief at a higher tax rate.
Any remaining unused loss is then carried forward.
Important Rules for Current Year and Carry Back Claims
A carry back claim can only be made after a current year claim has been made.
Both current year and carry back claims are all-or-nothing — partial claims are not permitted.
Claims must be made within 2 years of the end of the loss-making accounting period.
Carried Forward Trading Losses
Trading losses carried forward can generally be offset against future total profits, subject to certain restrictions.
Key Conditions
Relief is not automatic — a claim must be made.
The claim must be submitted within 2 years of the end of the accounting period in which relief is to be claimed.
Partial claims are allowed, which means losses can be preserved strategically — for example, to avoid wasting qualifying charitable donations, unlike carry back claims which are all-or-nothing.
The company must continue trading in the period in which the relief is claimed.
Terminal Loss Relief
Where a company ceases trading, terminal loss relief may be available.
This allows trading losses of the final 12 months of trading to be carried back against trading profits of the previous 36 months, rather than the usual 12-month carry back period.
This relief can generate valuable corporation tax repayments in the final years of trade.
Relief for Other Losses
Not all losses are treated in the same way for corporation tax purposes.
UK Property Business Losses
Losses from a UK property business must be offset against the total profits of the current accounting period.
Carry back claims are not permitted
Any excess property losses are carried forward
Carried forward property losses are treated as flexible losses, meaning they can be offset against future total profits, subject to the normal carried forward loss restrictions.
Capital Losses
Capital losses are first set against chargeable gains arising in the same accounting period to arrive at net chargeable gains.
Carry back claims are not permitted
Any unused capital losses are carried forward
Important Point:
Carried forward capital losses are ring-fenced, meaning they can only be offset against future chargeable gains — not against trading income or total profits.
Unlike trading or property losses:
Carried forward capital losses are automatically relieved
They do not require a claim
They cannot be used flexibly against total profits
Final Thoughts
Choosing how to use losses is an important corporation tax planning decision. While carrying losses back may generate an immediate tax refund, carrying them forward may produce greater value where future tax rates are higher.
Businesses should also carefully manage:
claim deadlines
loss restrictions
deferred tax recognition
continuity of trade requirements
Effective loss planning can improve both cash flow and long-term tax efficiency.
If your company has incurred losses and you want to maximise the relief available, professional tax advice can ensure claims are made in the most beneficial way.
Get in touch:
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