United Kingdom

Resident companies are taxable in the United Kingdom on their worldwide profits (subject to an opt-out for non-UK PEs), while non-resident companies are subject to UK corporation tax on the trading profits attributable to a UK PE, the trading profits attributable to a trade of dealing in or developing UK land (irrespective of whether there is a UK PE), on gains on the direct and certain indirect disposals of UK property, and on UK property rental business profits plus UK income tax on any other UK-source income. In practice, for many companies, the application of a wide range of tax treaties, together with the dividend exemption, makes the UK corporation tax system more like a territorial system.

General corporation tax rates

The main rate of corporation tax is 25% for the financial year beginning 1 April 2024 (previously 25% in the financial year beginning 1 April 2023). This main rate applies to companies with profits in excess of GBP 250,000. For UK resident companies with augmented profits below GBP 50,000, a lower rate of 19% is generally applicable. For companies with augmented profits between GBP 50,000 and GBP 250,000, there is a sliding scale of tax rates. For corporate entities with associated companies, both profit limits are divided by the number of active companies worldwide. The main rate of corporation tax and the small profits rate will remain at 25% and 19% respectively, for the financial year beginning 1 April 2025. 

Where the taxable profits can be attributed to the exploitation of patents, a lower effective rate of tax applies. The rate is 10%. Profits can include a significant part of the trading profit from the sales of a product that includes a patent, not just income from patent royalties.

Special corporation tax regimes

Apart from the six specific exceptions noted below, there are no special regimes for particular types or sizes of business activity; in general, all companies in all sectors are subject to the same corporation tax rates and rules. However, certain treatments and reliefs do vary according to size, including transfer pricing, R&D credits, and some targeted anti-avoidance rules.

For large companies, there are some additional compliance and reporting requirements. Some elements of HMRC’s organisational structure and approach to avoidance and compliance are arranged by size of business (e.g. Large Business Strategy).

Oil and gas company regime

Profits that arise from oil or gas extraction, or the enjoyment of oil or gas rights, in the United Kingdom and the UK Continental Shelf ('ring-fence profits') are subject to tax in the United Kingdom at a full rate of 30%. In addition, a supplementary charge to tax (SCT) of 10% applies to 'adjusted' ring-fence profits and a further 38% ‘windfall’ tax - the Energy Profits Levy (EPL) - also applies.

Whilst taxed at a higher rate, ring-fence profits do benefit from a number of enhanced incentives not historically available under the general corporation tax regime, including:

• 100% capital allowances on most capital expenditure (although since 2023 this has been available to most UK businesses)
• extended loss carryback rules on decommissioning expenditure (not available against the EPL), and
• investment allowances providing relief against supplementary charge for capex incurred.

Petroleum revenue tax (PRT) is now set at 0% but is retained for technical and historical reasons. PRT refunds are subject to corporation tax and SCT in the period received.

Effective 26 May 2022, the Energy Profits Levy (EPL), an additional tax on the profits of oil and gas companies was brought into effect. The rates and reliefs have changed a number of times since it was introduced. Following the Labour Party’s October 2024 Budget, the EPL regime is broadly as follows:

• The EPL rate is 38% from 1 November 2024 (it increased from 35%; it was originally 25%). 
• No relief for EPL purposes is available for historical tax losses carried forward as at 26 May 2022 or for any decommissioning expenditure incurred. 
• The EPL will continue to 31 March 2030 (originally 31 December 2025). 
• The ‘normal’ 29% investment allowance - originally designed to encourage investment in the UK North Sea - has been removed from 1 November 2024. 
• A 80% decarbonisation investment allowance exists for capital expenditure associated with the decarbonisation of upstream petroleum production.

The Energy Security Investment Mechanism (ESIM) means that::

• EPL will not apply should oil and gas prices remain at or below USD 74.21/bbl for oil and GBP 0.57/thm for gas. These prices will be adjusted on 1 April each year, calculated based on the previous December’s consumer price index (CPI).
• The reference price period (in which oil and gas prices must on average fall below the reference price) is a rolling six month period, ending on the last day of each calendar month. 
• The government has confirmed that if ESIM is triggered, legislation will be enacted to end the EPL effective on the last day of the reference price period in which the price went below the threshold price for oil and gas.

The government continues to review the UK oil and gas fiscal regime and engage with the energy sector on future changes. The outcome from the most recent call for evidence was confirmation from the government of the core principles that will direct future policy decisions, including:

• Supporting investment through predictability over the future tax treatment of price shocks and maintaining the existing set of investment incentives.
• Outlining support for and conclusions about energy transition and decarbonisation.
• Highlighting continued engagement on suggestions for simplifying the tax regime.

Life insurance company regime

Life insurance businesses are also taxed under a special regime, which effectively includes different corporation tax rates as well as special rules for quantifying profits.

Tonnage Tax regime

Companies that are liable to corporation tax and operate qualifying ships that are strategically and commercially managed in the United Kingdom can elect (subject to certain conditions) to apply Tonnage Tax in the place of corporation tax. Tonnage Tax is an alternative method of calculating corporation tax profits by reference to the net tonnage of operated ships. The Tonnage Tax profit replaces the tax-adjusted profit/loss on a shipping business and certain related activities, as well as the chargeable gains/losses made on Tonnage Tax assets. Any other profits are taxable under the normal corporation tax regime.

A Tonnage Tax election must, broadly, be made within 12 months from the day that the company became eligible to enter the regime. However, a new window for entry into the Tonnage Tax regime for eligible companies from 1 June 2023 to 30 November 2024 was announced in Budget 2023 and implemented by a Statutory Instrument made on 9 May 2023. 

Finance Act 2024 extended the scope of Tonnage Tax to include elections into the regime by companies that manage qualifying ships, with effect for elections made on or after 1 April 2024. In addition, Finance Act 2024 increased the capital allowance limit for persons who lease ships to companies within Tonnage Tax with effect for leases entered into on or after 1 April 2024. 

Banking sector

A supplementary tax (‘banking surcharge’) is applicable to companies in the banking sector at 3% on profits in excess of GBP 100 million with effect for accounting periods commencing on or after 1 April 2023. Prior to this date, the rate of supplementary corporate tax charge was 8% on profits above GBP 100 million. 

Loss utilisation is restricted; pre-1 April 2015 carried forward trading losses can be set against only 25% of profits in a period, and post-1 April 2015 carried forward trading losses are subject to the general loss restriction.

Real estate investment trust (REIT) regime

A UK REIT is, broadly, a UK resident company or a group of companies of which the principal company is UK tax resident, carrying on a property investment business, with property let to third-party tenants. Subject to the satisfaction of a number of conditions, REITs are taxed under a special regime.  

A UK REIT is exempt from UK tax on both rental income and gains relating to its qualifying property rental business, as well as gains on the sale of shares in qualifying UK property-rich companies. 

Profits from activities of the REIT other than the property rental business (the ‘residual business’) are subject to corporation tax in the normal way.

Tax is effectively levied at the investor level (subject to the tax status of investors) on their share of rental income that is distributed to them by the REIT as a property income distribution (PID) on which 20% withholding tax (WHT) is applied, subject to certain exemptions. Distributions of exempt gains are treated in the same way (i.e. as PIDs).

Shareholders are generally treated as receiving property income, which is subject to corporation tax/income tax at the investor’s marginal tax rate. However, investors who are exempt from UK tax can reclaim any WHT to put them into a position equivalent to investing directly in UK real estate.

For non-resident investors, it may be possible to reclaim some or all of the WHT on dividends, depending on the terms of any relevant double tax treaty (DTT).

Qualifying asset holding company (QAHC) regime

The QAHC regime was introduced with effect from April 2022, and slightly amended in 2023, in order to mitigate the tax roadblocks that prevent the use of a UK company to act as a holding company/intermediate holding company. 

A QAHC must be at least 70% owned by diversely owned funds managed by regulated managers, or certain institutional investors, and exists to facilitate the flow of capital, income, and gains between investors and underlying investments. There are a number of detailed provisions relating to the regime, but broadly, in terms of the benefits, it is allowed tax exemption/benefits in respect of:

• Gains on the disposal of certain shares and non-UK property. 
• The profits of an overseas property business.
• The obligation to deduct income tax at the basic rate on payments of interest.
• Modified rules in relation to deductions for interest and other finance costs on debt funding the QAHC.

Also, there is capital (as opposed to income) treatment of payments in the hands of investors made where a QAHC redeems, repays, or repurchases its own shares, and an exemption from stamp duty/stamp duty reserve tax (SDRT) on repurchases by a QAHC of share and loan capital.

Residential Property Developer Tax (RPDT)

A UK RPDT was introduced with effect from 1 April 2022. It applies to a company or corporate group that holds or has held interests in land/property as trading stock in the course of a trade and is subject to corporation tax on trading profits from residential property development activity. The tax applies at a rate of 4% to annual profits exceeding GBP 25 million (on a group basis, where relevant).

Income tax for non-resident companies

A non-resident company is subject to UK corporation tax on the trading profits of a UK PE and, irrespective of whether there is a UK PE, the trading profits attributable to a trade of dealing in or developing UK land, as well as profits from a UK property rental business. Non-resident companies are also subject to UK corporation tax on gains on the direct and certain indirect disposals of UK property (see 'Capital gains on disposal of UK immovable property by non-UK residents’ in the Income determination section).

Any other UK-source income received by a non-resident company is subject to UK income tax at the basic rate, currently 20%, without any allowances (subject to any relief offered by a DTT, if applicable). This charge has most commonly arisen in relation to UK rental income earned by a corporate non-resident landlord (NRL), which, until 5 April 2020, was within the scope of UK income tax. The United Kingdom operates an NRL scheme that requires the NRL's letting agent or tenants to withhold income tax at 20% at source unless they have been notified that the NRL has applied for and been given permission to receive gross rents. The NRL scheme is continuing, notwithstanding that corporate NRLs are now within the scope of corporation tax in respect of the profits of their property rental business (see ‘Non-resident companies within corporation tax on UK property rental business income from 6 April 2020' in the Income determination section).

Diverted Profits Tax (DPT)

DPT, introduced in April 2015, is part of the United Kingdom’s response to the shifting tax environment, most notably highlighted in the OECD’s Base Erosion and Profit Shifting (BEPS) reports. DPT is separate from other corporate taxes. The usual rate of DPT charged on diverted profits (as defined) was increased from 25% to 31% from 1 April 2023, with apportionment provisions for accounting periods straddling the commencement date. This increase was made in order to maintain the differential between the rate of DPT and corporation tax, which was also increased by 6% from that date. The rate of DPT charged on diverted profits that are UK ring-fenced profits or notional ring-fence profits (broadly oil extraction operations) remains 55%. The rate of DPT charged on taxable diverted profits that would have been subject to the bank surcharge remains unchanged at 33%.

DPT may apply in two circumstances:

1. where groups create a tax benefit by using transactions or entities that lack economic substance (as defined), involving an effective tax mismatch outcome and the insufficient economic substance condition is met, and/or
2. where foreign companies have structured their UK activities to avoid a UK PE involving an effective tax mismatch outcome and the insufficient economic substance condition is met and/or the tax avoidance condition is met.

There are several situations or types of transactions that are not within the scope of the DPT rules.

The following are not within the scope of the DPT rules in either of the circumstances outlined above:

• transactions where the parties are both SMEs,
• situations where the tax mismatch arises from loan relationships (and derivatives hedging loan relationships), and
• transactions involving the receipt of payments by the following types of bodies:
• pension funds
• person with sovereign immunity
• certain investment funds, and
• charities.

The following are not within the scope of the DPT rules in the second circumstance only:

• total UK-related sales revenue is less than GBP 10 million for the period, or 
• total UK-related expenses are less than GBP 1 million for the period.

Companies are required to notify HMRC if they are potentially within the scope of DPT (even if it is anticipated that there will be no DPT payable, e.g. due to credit relief) within three months of the end of the accounting period to which the notification would relate. The legislation is complex and subjective in places, and it has the potential to apply more widely than might be expected.

In January 2019, HMRC launched the Profit Diversion Compliance Facility, which is aimed at multinationals using arrangements targeted by DPT who are not currently under a DPT or transfer pricing enquiry.

The Facility is designed to encourage businesses potentially impacted to review their tax policies, change them as appropriate, and use the Facility to submit a report with a proposal to pay any additional tax, interest, or penalties due. This enables the business to bring their tax affairs up to date efficiently and without intervention from HMRC.

Finance Act 2022 (FA22) introduced three changes to the rules. It inserted a new subsection (101C FA2015) that provides that a final closure notice may not be issued in relation to an open enquiry where the review period for a DPT charging notice remains open. This is clearly a response to the First-tier Tribunal (FTT) decision in Vitol Aviation Ltd v HMRC, in which the FTT found that HMRC was in possession of sufficient information on the transfer pricing aspects to close their corporation tax enquiries and despite the DPT review period still being open, the FTT directed HMRC to close their corporation tax enquiries. This is an important immediate change to the legislation, resulting in DPT still being the 'stick' to encourage the resolution of transfer pricing disputes. This change has effect in relation to any relevant tribunal direction that is given on or after 27 October 2021, unless the application for the direction was made before 27 September 2021.

In addition, FA22 also: 

• Extended the ability to amend tax returns under s101 A / B to the last 30 days of the review period instead of the first 12 months of the review period. Practically, this gives taxpayers an additional two months to agree to a corporation tax resolution to a DPT enquiry.
• Introduced a measure to allow relief against DPT to be given where it is necessary to give effect to a decision reached in a Mutual Agreement Procedure (MAP). This is a significant reversal of HMRC’s earlier position that DPT was 'treaty-proof' and will be a welcome development for taxpayers subject to DPT enquiries.

As part of HMRC’s consultation on the UK DPT legislation (as well as other international tax matters) back in June 2023, the main issue in focus is whether to remove DPT’s separate tax status and bring it within the scope of corporation tax by way of a new ’diverted profits tax assessment‘, explicitly acknowledging the connection between DPT and transfer pricing, and providing access to treaty benefits. This is seen as a notable simplification that would provide greater certainty and clarity.

In addition, there are some points that HMRC was looking to clarify in law to reflect their position in practice, including:

• Confirming that the effective tax mismatch outcome (in essence the DPT approach to ’tax advantage‘) applies equally to a reduction in UK income as it does to an increase in UK expenses.
• Clarifying that DPT applies to the creation or increase in the amount of a loss and not only to a reduction in profit.
• Aligning the wording of the ’relevant alternative provision‘ (akin to the comparison with a third-party transaction) more closely to the UK’s tax treaties.

As noted above, the Government has announced that it will further consult on reforms to the UK DPT legislation in Spring 2025.

Local income taxes

There are no local or provincial taxes on income, although legislative powers are in place to introduce a reduced rate of corporation tax in Northern Ireland. It is not clear when the reduced rate will be introduced or at what rate.