Core Allowances
Full Expensing
Full Expensing refers to a capital allowance measure introduced by HM Revenue & Customs (HMRC) that allows companies to deduct 100% of the qualifying cost of main-rate plant and machinery expenditure from their taxable profits in the year of investment. Enacted permanently in the Autumn Finance Act 2023 following its predecessor the super-deduction, Full Expensing is governed by the Capital Allowances Act 2001 to stimulate business investment across the United Kingdom. Under this provision, companies paying Corporation Tax can offset every pound invested in eligible assets against their tax bill, saving 25p in Corporation Tax for every pound spent at the main rate. The mechanism bypasses traditional writing down allowances for main-rate assets, providing immediate cash-flow relief for corporate entities investing in commercial property infrastructure.
Why it matters
Full Expensing fundamentally transforms corporate capital expenditure strategy by accelerating tax relief and significantly improving project cash flows for commercial property investors and corporate occupiers. By allowing an immediate 100% write-off for main-rate plant and machinery, such as HVAC systems, lifts, and electrical installations, companies eliminate the delay of recovering costs via the 18% main pool writing down allowance. According to HM Treasury and HMRC taxation statistics, this permanent measure provides billions of pounds in tax savings annually, incentivizing capital deployment into modern, energy-efficient commercial buildings. For UK businesses, the relief directly enhances the internal rate of return (IRR) on property refurbishment and fit-out projects, reducing the net cost of capital investment. Failure to properly identify and claim Full Expensing on qualifying fixtures can result in substantial permanent overpayments of Corporation Tax, adversely affecting corporate balance sheets and working capital.
The common misconception
Misconception: Full Expensing is available to all business structures, including sole traders and partnerships. Reality: Full Expensing is strictly limited to companies subject to UK Corporation Tax and is explicitly unavailable to unincorporated businesses, sole traders, partnerships, or LLPs taxed as partnerships. Misconception: Buildings and structural walls qualify for Full Expensing. Reality: Integral features and plant and machinery qualify, but basic structures, land, and elements covered by the Structures and Buildings Allowance are excluded. Misconception: Assets purchased for leasing qualify for Full Expensing. Reality: HMRC legislation contains specific restrictions that exclude most plant and machinery provided for leasing or hiring out, with narrow exceptions for certain ring-fenced leasing scenarios.
A worked example
Consider a UK-registered manufacturing and distribution company that acquires a commercial warehouse facility and undertakes a comprehensive mechanical and electrical (M&E) refit costing £500,000. Under traditional rules, the qualifying plant and machinery, such as lighting systems, heating, ventilation, and power distribution, would be allocated to the main pool and attract an 18% writing down allowance on a reducing-balance basis, delaying full tax relief over many years. With Full Expensing, the company can deduct the entire £500,000 expenditure from its taxable profits in the accounting period of purchase. Assuming the company pays Corporation Tax at the main rate of 25%, this immediate deduction generates a direct tax saving of £125,000 in Year 1. This upfront cash injection significantly improves the project's net present value (NPV) compared to legacy pooling mechanisms. However, when the asset is eventually sold, a balancing charge equal to the disposal value must be brought into account, reversing the initial tax benefit proportionate to the sale proceeds.
Source: www.gov.uk