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United Kingdom Corporate - Deductions

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As noted in the Income determination section, the UK tax system requires taxable profits to be calculated by aggregating (i) the company's net income from each source and (ii) the company's net chargeable gains arising from the sale of capital assets. This approach gives rise to a particularly complicated regime so far as deductions are concerned. Expenses are usually allocated to the source of income (or occasionally by reference to income generally) or to the particular gain to which they relate. The rules governing their deductibility differ according to whether the expense relates to a capital gain or to income, and, indeed, according to the particular source of income concerned. For example, there is a considerable difference in the manner in which tax relief is given for expenses incurred by companies trading in property as compared to those that invest in property. The regime also has a large number of specific rules dealing with particular types of deductions that take priority over the more general rules for each type of income.

We have therefore set out the general rule for trading expenses, being the most common category, and, following that analysis, considered some specific common exceptions.

General rules for trading expenses

A trading company is generally permitted to deduct expenses that are incurred wholly and exclusively for the purposes of the company's trade, provided those costs are not capital in nature and are charged to the profit and loss account. There is a significant amount of case law surrounding whether expenses have been incurred wholly and exclusively for the purposes of a company's trade and whether they are capital or not.

Relief is generally given in the period the expenses are accrued in the accounts, subject to some specific exceptions. In particular, contributions to a registered pension scheme are only allowed on a 'paid' basis, with some further provisions under which some contributions may be spread over a number of years; and if bonuses and other staff costs are paid out more than nine months after the end of the accounting period in which they are accrued, they are only allowed on a paid basis.

The general rule is made subject to a range of specific statutory provisions, some of which allow deductions and others of which limit them; some of the more important of these are discussed below, but there are many others. One example is that the costs of business entertainment cannot generally be deducted.

Depreciation and amortisation

Depreciation of fixed assets (other than of goodwill and other assets within the intangible fixed asset regime, see below) is not allowable as a deduction from any source of income. However, traders, and most non-traders, are instead allowed specified rates of annual deduction in respect of specified classes of assets, together referred to as 'capital allowances', that are deducted in calculating trading income for traders and (broadly) against income derived from the use of the fixed assets for non-traders.

Capital allowances for machinery and equipment can be disclaimed in whole or in part, thereby deferring allowances.

In the period of expenditure, capital allowances are available, generally at 18% of the cost of machinery and equipment acquired for use in a trade or property rental business; thereafter, capital allowances are taken generally at 18% per annum on the reducing-balance basis. With some exceptions, the rate of capital allowances for machinery and equipment with an expected useful life when new of at least 25 years is 8%. This 8% rate also applies to certain integral features in buildings and thermal insulation.

All businesses, regardless of size, can claim an annual investment allowance of 100% on the first GBP 200,000 per year of most qualifying expenditure. This is restricted to a single allowance for groups of companies or associated businesses.

Capital allowances are given on cars at rates dependent on emission levels.

Enhanced allowances, typically at a rate of 100%, are available for expenditure on certain energy saving plant and other specific categories. The products and technologies supported by this regime are reviewed and updated regularly.

No capital allowance is normally allowed on buildings, apart from certain machinery and equipment embodied in the fabric of the buildings. In some buildings (e.g. hotels, retail, offices), such deductions may be significant.

Capital allowances may also be available in respect of the cost of the acquisition of mineral assets and extraction, generally at the rates of 10% and 25%.

Excess capital allowances are generally recaptured on disposal. The recapture is calculated on a 'pool' basis for most machinery and equipment, in which case there is no recapture unless the sale proceeds exceeds the total tax written down value of the pooled assets.

Where assets are leased, capital allowances are generally available to the lessor rather than the lessee. The rate of capital allowance of most plant or machinery leased to non-residents is generally restricted to 8%, but in some cases to nil.

Intangible fixed assets

A special regime applies to intangible assets, such as patent rights, know-how, and trademarks, and (prior to 8 July 2015) goodwill. Royalties are generally deductible on an accounts basis, and, except in relation to 'grandfathered' assets owned by the group on 31 March 2002, the accounts' amortisation of intangible assets is also deductible (with an option to take a flat 4% deduction even if not amortised in the accounts). Traders will take the deductions in computing trading income; non-traders will create a 'non-trading loss on intangible fixed assets' that can be relieved as a loss against any profits of the year, carried back one year, or carried forward indefinitely.

With effect for acquisition of goodwill and customer-related intangibles on or after 8 July 2015, amortisation, impairment, and certain other charges will not be deductible for tax. Subsequent profits and losses on disposals of such goodwill remain taxable/deductible.

Income costs relating to R&D are normally deductible in any event, but there is a special incentive connected with R&D that generally allows additional tax relief (see the Tax credits and incentives section for more information).

Management expenses

Holding companies and companies with investment business can deduct expenses if they are expenses of managing the company's investment business and are not capital in nature. Such costs would typically include audit fees, directors' costs, rent, local rates, and office costs. These costs can be set against any sources of profit the company may have, including gains and financing income.

If the company has inadequate income, excess expenses can be surrendered as group relief or carried forward to set against future income, with no time limit.

Many of the specific rules on the deduction of trading expenses also apply to management expenses. Many rules giving traders specific deductions for certain costs also apply, but this is not always the case.

Employee share schemes

The actual and deemed costs of an employing company for the deemed cost of providing shares or options to employees is usually deductible, depending on the nature of the share plan and the accounting. This will generally allow a deduction to a subsidiary company whose employees receive shares or options in the parent company.

Funding costs

Funding costs (primarily fees and interest) are broadly deductible on an accounts basis, even if capital in nature, but subject to thin capitalisation constraints (with no explicit safe harbours) and a worldwide interest cap based on the group's external debt levels (but see the proposal to replace this from April 2017 below). This extends to foreign exchange deductions relating to debts owed and receivable.

Traders will generally take the deductions in computing trading income (which is also accounts based). Deductions relating to loans not used for trading purposes will give rise to 'non-trading deficits' that, if not group relieved, can be offset against profits of that year generally, carried back one year (against that year's funding profits), or carried forward indefinitely against non-trading profits.

There are complex and specific rules dealing with financial instruments, derivatives, cross-border transactions, etc.

There is a proposal to introduce, from 1 April 2017, a fixed ratio limiting corporate tax deductions for net interest expense to 30% of UK EBITDA, and a group ratio rule for highly geared groups. This will replace the worldwide interest cap and will often operate to reduce the amount of tax deductions achieved by UK taxpayers. Whilst these proposals are not yet law (because of delays in the legislative process), it is anticipated that these reforms are likely to be implemented, and that the effective date will be 1 April 2017. However, further changes to the provisions may be made before implementation.

Bad debts, provisions, and reserves

Provisions for future costs can be deducted for tax purposes if they:

  • are in respect of allowable revenue expenditure
  • are made in accordance with acceptable accounting practice
  • do not conflict with any statutory rule governing the timing of relief (e.g. in relation to payment of staff costs), and
  • are estimated with sufficient accuracy.

This rule extends to bad debts on trading account. Generally, however, bad debts are dealt with under the 'loan relationships' rules for financing costs and financing income. The rules there, however, are broadly the same; if the bad debt can be identified specifically enough to allow a bad debt provision that satisfies UK accounting standards, it should be deductible.

Charitable donations

Most donations to charities by companies are deductible.

Fines, penalties, and bribes

Any payments that constitute a criminal offence (e.g. a bribe) are not deductible for tax. Fines and penalties imposed for breaking the law are also not deductible, although a deduction is usually available for legal costs incurred in defending such an action. Usually, there is no deduction for civil penalties, interest, and similar surcharges (e.g. relating to VAT). Fines for regulatory breaches are not allowed for tax, but the costs of compensating customers, etc. are usually deductible.

Damages that are compensatory rather than punitive (e.g. damages for defamation payable by a newspaper company) are often deductible, as are payments for breach of contract. Payments to employees for wrongful dismissal, etc. are usually deductible.


Local municipal taxes (business rates) may be deducted from taxable income.

Net operating and capital losses

See Income losses in the Income determination section for a description of the treatment of income losses and capital losses.

Payments to foreign affiliates

There are no special rules for payments to foreign affiliates, so their tax treatment follows the basic rules for deductions set out above. The transfer pricing rules will impose an arm's-length price.

Last Reviewed - 22 June 2017

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