Capital gains tax : recent developments
This briefing discusses the reforms made to capital gains tax since 2008, including the most recent changes announced in the 2024 Autumn Budget.

The Energy (Oil and Gas) Profits Levy Bill 2022-23 is to introduce a new temporary levy on North Sea oil and gas production.
Energy (Oil and Gas) Profits Levy Bill 2022-23 (644 KB , PDF)
Companies operating in the North Sea pay three separate profit-related taxes on oil and gas production: ring fence corporation tax, supplementary charge, and petroleum revenue tax (PRT). Total receipts from these taxes were £3.1 billion in 2021/22.
Following speculation that the Government would introduce a one-off ‘windfall tax’ in response to increased world oil and gas prices and the boost in profits from North Sea oil and gas production, on 26 May 2022 the then Chancellor Rishi Sunak announced measures to support households. These are to be funded in part by a new tax on the profits from North Sea oil and gas production: the Energy Profits Levy.
Details of the Energy Profits Levy were set out in a factsheet published by HM Treasury.
Currently, the oil and gas sector pay a 40% headline rate tax on profits from oil and gas production in the UK and the UK Continental Shelf (UKCS). This consists of 30% ring fence corporation tax and 10% supplementary charge. At present the rate of petroleum revenue tax (PRT) is zero.
The Energy Profits Levy is an additional 25% tax on UK oil and gas profits on top of the existing 40% headline rate of tax, taking the combined rate of tax on profits to 65%.
The Levy takes effect from 26 May 2022. HM Treasury estimates that it will raise around £5 billion in its first 12 months
Companies will not be able to offset previous losses or decommissioning expenditure against profits subject to the levy. The Government’s purpose in restricting relief this way is to “to appropriately tax the extraordinary profits” that the sector is making at present. An Investment Allowance will apply, set at 80%, available to companies at the point of investment.
The Treasury also published a technical note that provided a few more details on how the Energy Profits Levy would work in practice. This confirms that the Energy Profits Levy is “temporary” and “will be phased out when oil and gas prices return to historically more normal levels.” The legislation to establish the new charge will include a clause to remove the tax after 31 December 2025.
The Levy is to be legislated for via a standalone Bill. On 21 June HM Revenue & Customs published a draft of this legislation, and a draft version of its explanatory notes, seeking technical feedback before the Energy (Oil and Gas) Profits Levy Bill is introduced. The consultation closed on 28 June.
The Energy (Oil and Gas) Profits Levy Bill [Bill 135 of 2022-23] was introduced on 5 July 2022. The Bill, with its explanatory notes, is published on the Bill’s page on Parliament.uk, which also provides details of its parliamentary progress.
HM Revenue & Customs has published a tax information and impact note on the Bill.
As noted, the Levy has effect for profits arising on or after 26 May 2022.
Following an announcement by the Leader of the House on 30 June that the Bill would be ‘fast tracked’, the Bill completed all of its stages in the House of Commons on Monday 11 July. The Energy (Oil and Gas) Profits Levy Act 2022 received Royal Assent on 14 July 2022.
Commons Library briefing Taxation of North Sea oil and gas explains how profits from North Sea oil and gas production are taxed, and how the fiscal regime that applies to North Sea oil and gas production has been reformed in recent years, including the Government’s announcement of the Energy Profits Levy.
Energy (Oil and Gas) Profits Levy Bill 2022-23 (644 KB , PDF)
This briefing discusses the reforms made to capital gains tax since 2008, including the most recent changes announced in the 2024 Autumn Budget.
The Water Bill was introduced in the House of Commons on 16 October 2024, and its second reading took place on 28 March 2025. The second reading debate was adjourned, and is scheduled to continue on 4 July 2025, if there is time in the sitting. The Library briefing provides an overview of the bill and background information.
The state pension is liable to income tax, though pensioners are unlikely to pay tax in practice if their only income is the state pension.