Understanding the distinction between expenses allowable against income and those deductible for Capital Gains Tax (CGT) is fundamental to UK tax practice. The nature of an expenditure dictates its tax treatment; it is not a matter of choice. This guide provides a clear framework for correctly classifying costs, ensuring compliance and accurate computation of tax liabilities on asset disposals.
The core principle is simple: a cost cannot be deducted twice. An expense allowable against income is prohibited from also being used to reduce a capital gain.
Expenses Allowable Against a Capital Gain
When you calculate the gain on an asset disposal, the law permits the deduction of specific categories of capital expenditure. The Taxation of Chargeable Gains Act 1992 (TCGA 1992) provides the definitive list.
The Three Categories of Allowable Expenditure (TCGA 1992, s 38)
Section 38(1) of TCGA 1992 restricts allowable deductions to three specific types of expenditure.
- Acquisition Costs: This includes the price you paid for the asset, plus the incidental costs of acquiring it. Examples include Stamp Duty Land Tax, legal fees for the conveyance, and surveyor’s fees.
- Enhancement Expenditure: This is capital expenditure you incur to enhance the value of the asset, provided the enhancement is reflected in the asset’s state at the time of disposal. This also covers costs to establish, preserve, or defend your title to the asset. For instance, the cost of building an extension is allowable enhancement expenditure, but routine redecorating is not.
- Disposal Costs: This covers the incidental costs of making the disposal. Common examples include estate agent fees, auctioneer’s commission, and legal fees related to the sale.
Accountant’s fees are only allowable to the extent they relate to a valuation or apportionment required to compute the gain, not for the general calculation of the tax liability itself.
The Prohibition: No Double Deduction for Expenses
The most critical aspect of the “allowable expenses vs. capital gains” analysis is the rule preventing double tax relief. Income tax treatment always takes precedence over CGT.
The Rule in TCGA 1992, s 39
Section 39(1) of TCGA 1992 explicitly excludes any expenditure from the CGT calculation if it is allowable as a deduction against income tax. This applies whether the deduction was actually claimed or not; it is enough that the expenditure could have been allowed against income.
This means that any cost considered a revenue expense for a trade or property business cannot be set against a capital gain. For example, the cost of redecorating or rewiring a rental property is generally treated as a revenue expense deductible from rental profits. Consequently, you cannot also claim these costs as enhancement expenditure to reduce the capital gain upon selling the property.
| Expenditure Type | Tax Treatment | Rationale |
|---|---|---|
| Legal fees to acquire a property | Deductible for CGT. | An incidental cost of acquisition under s 38(1)(a) TCGA 1992. |
| Routine repairs to a rental property | Deductible from rental income. | A revenue expense of the property business. It is therefore excluded from the CGT computation by s 39 TCGA 1992. |
| Cost of building a garage for a property | Deductible for CGT. | Capital enhancement expenditure reflected in the asset’s value, per s 38(1)(b) TCGA 1992. |
| Advertising costs to find a buyer | Deductible for CGT. | An incidental cost of disposal under s 38(1)(c) TCGA 1992. |
The Role of Capital Allowances
Capital Allowances complicate the distinction. They provide relief for certain types of capital expenditure (e.g., on plant and machinery) by allowing the cost to be deducted from income or profits.
Because relief is given against income, the expenditure cannot also be deducted from a capital gain.
Interaction with Capital Losses
The interaction is most relevant when an asset that has qualified for capital allowances is disposed of at a loss. Section 41 of TCGA 1992 restricts the amount of the allowable capital loss by the amount of any capital allowances given in respect of the expenditure on that asset. The purpose of this rule is to prevent a taxpayer from obtaining relief for the same expenditure twice: once through capital allowances against income, and again as a capital loss.
For example, if an asset cost £10,000 and £6,000 of capital allowances have been claimed, the allowable expenditure for the purpose of calculating a capital loss is reduced to £4,000.
Summary: Revenue Expense or Capital Deduction?
The correct classification of an expense is determined by its nature at the time it is incurred. It is a matter of fact and law, not a choice.
- Allowable against Income: Expenditure that is revenue in nature (e.g., repairs, maintenance, running costs of a business) must be claimed against the relevant income source.
- Allowable against Capital Gain: Expenditure that is capital in nature and directly relates to the acquisition, enhancement, or disposal of the asset can be deducted when calculating the capital gain.
Maintaining meticulous records is essential. You must be able to justify why each item of expenditure has been treated as either a revenue expense or a capital cost deductible for CGT.
For detailed guidance on allowable expenditure for capital gains, you should consult HMRC’s Capital Gains Manual, starting at CG15150. For the rules on capital allowances, refer to the Capital Allowances Manual. The primary legislation is found in the Taxation of Chargeable Gains Act 1992 and the Capital Allowances Act 2001.
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