Land Remediation Relief UK — Corporation Tax Deduction for Contaminated Land

Who Can Claim Land Remediation Relief?

Land Remediation Relief is available only to companies within the charge to UK corporation tax — it is not available to individual landlords, LLPs where the partner is an individual, or unincorporated businesses. The company must have incurred the qualifying remediation expenditure; it does not need to have been the company that acquired the contaminated land from the original contaminator. Key conditions: the company must not have caused or knowingly permitted the contamination; and the contamination must have been introduced by a third party (at a time when the third party was not the company or a connected person). This 'third party contamination' condition is central — a company that contaminates its own land cannot claim LRR on the subsequent clean-up. Companies acquiring contaminated land from arm's length third parties on the open market will generally satisfy this condition.

• Companies only: LRR applies to companies within the charge to UK CT — individual landlords, LLPs with individual partners, partnerships, and unincorporated businesses are excluded
• Third party contamination: the company must not have caused or knowingly permitted the contamination; contamination must have been introduced by a third party
• Arm's length acquisition: if the company acquired the land from a connected party (a group company or associated entity) rather than an arm's length third party, the third party contamination condition may not be satisfied — specialist advice needed
• Group companies: LRR claims can be made by group companies; but consider whether the contaminating entity and the remediating entity are connected persons — this can affect the availability of the relief
• Scotland/Wales/Northern Ireland: LRR is a UK-wide CT relief — available to companies with contaminated or derelict land in England, Wales, Scotland, and Northern Ireland equally

Contaminated Land — 150% Deduction

For contaminated land, the deduction is 150% of qualifying remediation expenditure: the standard 100% deduction (available as a normal trading or property business expense) plus an additional 50% deduction under the LRR rules. The net tax saving at a 19% CT rate is approximately £28.50 per £100 of qualifying expenditure. At 25% CT (companies above the marginal relief threshold for the CT increase from April 2023), the saving is £37.50 per £100. Qualifying contamination: the land must be in a contaminated state — defined broadly to include land where a pollutant (or potential pollutant) is present in, on, or under the land and there is a significant possibility of significant harm (broadly aligned with Part IIA of the Environmental Protection Act 1990). HMRC guidance (CIRD60000 series) identifies the following as commonly qualifying: arsenic, heavy metals (lead, cadmium, chromium, mercury); volatile organic compounds (solvents); asbestos; coal tar; landfill gas; radioactive substances; Japanese knotweed (specific provisions); radon (where a legal duty to remediate exists); mine workings spoil.

• 150% deduction: 100% standard deduction + 50% additional deduction = total 150% deduction against CT profits
• Tax saving: at 19% CT rate — approximately £28.50 per £100 of qualifying expenditure; at 25% CT — approximately £37.50 per £100
• Qualifying contamination: pollutants defined broadly in HMRC CIRD60000 guidance — arsenic, heavy metals, VOCs, asbestos, coal tar, landfill gas, Japanese knotweed, radioactive substances
• Significant possibility of significant harm: contamination must meet this threshold (broadly following Part IIA EPA 1990) — even if not formally designated as contaminated land by the local authority
• Sampling and surveying costs: the cost of investigating and sampling the land to establish the nature and extent of contamination is qualifying expenditure for LRR

Derelict Land — 110% Deduction

For derelict land (as opposed to contaminated land), the deduction is 110% of qualifying expenditure — the standard 100% deduction plus an additional 10% deduction. Land is 'derelict' for LRR purposes if it has not been in productive use since 1 April 1998 (or since it last came back into productive use after that date), and it cannot reasonably be put back into productive use without decontamination or demolition of existing structures. Derelict land does not need to be chemically contaminated — it covers land with redundant structures, industrial ruins, abandoned railway sidings, disused collieries, and similar sites. The 10% additional deduction is more modest than the contaminated land 50% uplift, but it is available for a wider range of sites where the primary obstacle to development is dereliction rather than chemical contamination.

• Derelict land definition: land not in productive use since 1 April 1998; cannot reasonably be made productive without demolition or decontamination of existing structures
• 110% deduction: 100% standard deduction + 10% additional deduction — less generous than the contaminated land 50% uplift, but available for a broader range of derelict sites
• Demolition costs: the cost of demolishing derelict structures (buildings, silos, chimneys, underground tanks) is qualifying expenditure for the derelict land additional deduction
• Combination sites: many brownfield sites are both derelict (redundant structures) and contaminated (chemical pollutants in the ground) — the 50% contaminated land uplift applies to the contaminated elements; the 10% derelict land uplift applies to demolition-only elements
• Planning permission not required: qualifying expenditure can be incurred before planning permission is obtained — as long as the expenditure is on remediation/demolition within the LRR rules

Qualifying Expenditure and the Tax Credit

Qualifying remediation expenditure for LRR includes: the cost of investigating and sampling the land (site investigation surveys; chemical analysis; environmental consultants); the cost of removing, treating, or containing the contamination (excavation and off-site disposal; in-situ treatment; bioremediation; capping layers; monitoring wells); costs of dealing with contaminated groundwater (pumping and treating systems); demolition of structures on derelict land; and professional fees directly attributable to the remediation works. LRR does not cover: the cost of new construction on the remediated site (those costs are subject to capital allowances or the capital gains base cost rules); or the enhancement of the land beyond its pre-contamination state. Land Remediation Tax Credit (LRTC): if the company cannot use the LRR deduction because it has no CT profits (e.g., it is a loss-making developer), it can surrender the additional LRR deduction (the 50% or 10% element) to HMRC in exchange for a cash payment calculated at 19% of the surrendered amount. The LRTC is capped at the company's total relevant PAYE and NIC costs for the accounting period.

• Qualifying expenditure: site investigation and sampling costs; excavation and disposal of contaminated material; in-situ remediation (bioremediation, chemical treatment); capping layers; contaminated groundwater treatment; demolition of derelict structures
• Not qualifying: new construction costs (separate capital allowances/TCGA regime); costs of enhancing the land beyond remediation; general overhead not directly attributable to remediation
• Plant used for remediation: plant and machinery used to carry out the remediation qualifies for 100% first-year allowances in addition to the LRR deduction
• Land Remediation Tax Credit (LRTC): loss-making companies can surrender the additional LRR deduction for a cash payment from HMRC at 19% of the surrendered amount; capped at total PAYE/NIC for the period
• HMRC manual: CIRD60000–CIRD62500 series provides detailed guidance on qualifying expenditure, the contaminated land conditions, and the claim procedure; HMRC has a dedicated LRR specialist unit

Making the Claim and Record Keeping

LRR is claimed in the company's corporation tax return (CT600) for the accounting period in which the qualifying expenditure is incurred. The claim is made in box 285 (land remediation relief) of the CT600. HMRC may enquire into LRR claims — the company should maintain detailed records: site investigation reports and sampling analysis; remediation specification and contractor certificates; invoices and payment records; professional certifications of the remediation works; evidence that the contamination was third-party-introduced. Professional advice: LRR claims are specialist — most claims are prepared with the assistance of environmental consultants (to confirm the contamination conditions are met) and specialist tax advisors (to identify qualifying expenditure, structure the claim, and prepare the CT600 entries). R&D alongside LRR: where innovative remediation techniques are used, there may be an overlap with the R&D tax credit regime — the two reliefs cannot generally be claimed for the same expenditure, but may be claimable for different elements of the same project.

• CT600 claim: LRR is claimed in the corporation tax return for the period in which the expenditure is incurred; claim must identify the amount of qualifying expenditure and the nature of the contamination
• Supporting evidence: site investigation reports; chemical analysis certificates; remediation contractor's completion certificates; invoices; evidence of third-party contamination origin
• HMRC enquiry risk: LRR claims attract HMRC scrutiny — maintain robust documentation; engage specialist environmental and tax advisors to ensure the claim is defensible
• Timing: qualifying expenditure can be spread across multiple accounting periods; the LRR deduction follows the period of expenditure, not the period of land acquisition
• R&D interaction: innovative bioremediation or novel treatment techniques may qualify separately for R&D credit — but the same expenditure cannot be double-claimed; specialist tax advice needed on the interface

Frequently asked questions