Corporation tax rates
The expected  increase in the rate of corporation tax for many companies from April 2023 to  25% will go ahead. This means that, from April 2023, the rate will increase to  25% for companies with profits over £250,000. The 19% rate will become a small  profits rate payable by companies with profits of £50,000 or less. Companies  with profits between £50,001 and £250,000 will pay tax at the main rate reduced  by a marginal relief, providing a gradual increase in the effective corporation  tax rate.
In addition:
    - Bank  corporation tax surcharge changes will proceed, meaning that from April 2023  banks will be charged an additional 3% rate on their profits above £100  million.
- From April  2023 the rate of diverted profits tax will increase from 25% to 31%.
Capital allowances
The super-deduction  regime, which gives a 130% enhanced first year allowance (FYA) to companies on  the purchase of qualifying plant and machinery, comes to an end on 31 March  2023. Instead, the government has announced Full Expensing, a 100% FYA, which  allows companies to deduct the cost of qualifying plant and machinery from  their profits straight away with no expenditure limit. Qualifying expenditure  will include most plant and machinery, as long as it is unused and not  second-hand, but will not include cars. Full Expensing will be effective for  acquisitions on or after 1 April 2023 but before 1 April 2026.
A 50% FYA for other  plant and machinery including long life assets and integral features (known as  special rate assets) will operate along similar lines.
Full Expensing and the  50% FYA are only available for companies and not for unincorporated businesses.
The Annual Investment  Allowance (AIA) is available to both incorporated and unincorporated  businesses. It gives a 100% write-off on certain types of plant and machinery  up to certain financial limits per 12-month period. The limit has been £1  million for some time but was scheduled to reduce to £200,000 from April 2023.  The government has announced that the temporary £1 million level of the AIA  will become permanent and the proposed reduction will not occur.
The government will  also extend the 100% FYA for electric vehicle charge points to 31 March 2025  for corporation tax purposes and 5 April 2025 for income tax purposes. 
Comment
The AIA amounts to    full expensing for 99% of businesses. The long-term ambition is to make Full    Expensing and the 50% FYA permanent.
Research and  Development (R&D) relief
For  expenditure on or after 1 April 2023, the Research and Development Expenditure  Credit (RDEC) rate will increase from 13% to 20% but the small and medium-sized  enterprises (SME) additional deduction will decrease from 130% to 86% and the  SME credit rate will decrease from 14.5% to 10%. A higher rate of SME payable  credit of 14.5% will apply to loss-making SMEs which are R&D intensive. To  be R&D intensive the ratio of the company's qualifying R&D expenditure  must be 40% or above the company's 'total expenditure' for the period. This  equates to a receipt of £27 for every £100 of R&D expenditure.
Other  announced changes to the R&D regime include expanding qualifying  expenditure to include the costs of datasets and of cloud computing. All  claims for R&D reliefs will have to be made digitally and be accompanied by  a compulsory additional information form. Companies will also need to notify  HMRC that they intend to make a claim within six months of the end of the  period of account to which the claim relates, generally if they have not made  an R&D claim in the previous three years. These changes apply to claims in  respect of accounting periods which begin on or after 1 April 2023 apart from  the additional information form, which will be required for claims made on or  after 1 August 2023.
The  restriction to relief on overseas expenditure, designed to refocus support  towards UK innovation, will now come into effect from 1 April 2024 instead of 1  April 2023.
Comment
The    increase in the RDEC rate means the UK now has the joint highest uncapped    headline rate of tax relief in the G7 for large companies.
The    government is currently considering responses to a consultation on merging    the RDEC and SME schemes and expects to publish draft legislation for    technical consultation in the summer.
Making Tax Digital  (MTD) for income tax
The  MTD regime is based on businesses being required to maintain their accounting  records in a specified digital format and submit extracts from those records  regularly to HMRC. In what appears to be a never-ending story, the government  has announced a further delay in MTD for income tax self assessment (ITSA).
The  mandation of MTD for ITSA will now be introduced from April 2026, with  businesses, self-employed individuals and landlords with income over £50,000  mandated to join first, a change from the original £10,000 limit.
Those  with income over £30,000 will be mandated from April 2027.
The  government will also review the needs of smaller businesses and look in detail  at whether the MTD for ITSA service can be shaped to meet the needs of smaller  businesses.
Following  the new approach, the government will not extend MTD for ITSA to general  partnerships in 2025.
HMRC  has previously announced that MTD for corporation tax will not be mandated  before 2026. This now looks even further away.
Accounting  periods that are not aligned to tax years
As  part of the MTD project, changes have been made to alter the rules under which  trading profits made by self-employed individuals and partnerships are  allocated to tax years.  
The  changes mainly affect unincorporated businesses that do not draw up annual  accounts to 31 March or 5 April. The transition to the new rules will take  place in the 2023/24 tax year and the new rules will come into force from 6  April 2024.
Affected  self-employed individuals and partnerships may retain their existing accounting  period but the trade profit or loss that they report to HMRC for a tax year  will become the profit or loss arising in the tax year itself, regardless of  the chosen accounting date. Broadly, this will require apportionment of  accounting profits into the tax years in which they arise.
Example
A business draws up accounts to 30 June every year.    Currently, income tax calculations for 2024/25 would be based on the profits    in the business' accounts for the year ended 30 June 2024. The change will    mean that the income tax calculations for 2024/25 will be based on 3/12 of    the profits for the year ended 30 June 2024 and 9/12 of the profits for the    year ended 30 June 2025.
This  change will potentially accelerate when business profits are taxed but  transitional adjustments in 2023/24 are designed to ease any  cashflow impact of the change.
Comment
An estimated 93% of sole traders and 67% of trading partnerships    draw up their accounts to 31 March or 5 April and the proposed changes    will not affect them. Those with a different year end might wish to consider    changing their accounting year end to simplify compliance with the tax rules.
Simplification  measures for small businesses
The  government is introducing a number of simplification measures to the tax system  for small businesses with the aim of encouraging growth by reducing the  administrative burden.
The  announcements include changes to IT systems to allow tax agents to payroll  benefits in kind on behalf of their clients and simplifications to the customs  import and export processes.
Further  consultations were launched which may lead to additional reforms including  expanding the use of the cash basis. Proposed changes in the consultation  include:
    - increasing  the thresholds so that more unincorporated businesses would be eligible
- making it  the default for eligible businesses
- relaxing  the restrictions on interest costs and loss reliefs.
Investment Zones
An Investment Zones  programme is being launched to encourage investment in 12 high-potential  knowledge-intensive growth clusters across the UK. It is expected that eight  sites will be in England and four across Scotland, Wales and Northern Ireland.
A five-year tax package  will allow businesses located on special tax sites within Investment Zones to  benefit from a number of tax reliefs including Stamp Duty Land Tax relief,  enhanced capital allowances, structures and buildings allowances and secondary  Class 1 NICs relief for eligible employers.
Freeports
The UK and Scottish governments  have jointly announced that Inverness & Cromarty Firth and the Firth of  Forth are the two locations for Scotland's Green Freeports. The two winning  bids will be supported by up to £52 million in start-up funding and will  benefit from tax reliefs and other incentives through a combination of devolved  and reserved powers.
Following bids in Wales, a  Welsh Freeport is also expected to be announced during Spring 2023. Eight  Freeports already exist in various locations in England.
Freeports are special areas  within the UK's borders where different economic regulations apply. They are  part of the government's work to 'level up' and boost economic activity across  the UK. The aim is to create innovative hubs, boost global trade, attract  inward investment, and increase productivity.
Seed Enterprise  Investment Scheme
From April  2023, companies will be able to raise up to £250,000 of Seed Enterprise  Investment Scheme (SEIS) investment, a two-thirds increase. To enable more  companies to use SEIS, the gross asset limit will be increased to £350,000 and  the age limit from two to three years. To support these increases, the annual  investor limit will be doubled to £200,000.
Tax treatment of  payments to farmers under the lump sum exit scheme
As  part of the transition to a new agriculture policy in England, the government  announced in November 2020 that it planned to:
    - In 2022,  offer farmers who wish to exit the industry the option of taking a lump sum  payment in place of any further Direct Payments.
- In 2024,  'delink' Direct Payments from the land for all farmers. This means that recipients  will no longer have to farm the land to receive the payments.
Payments  received under the Basic Payment Scheme are generally taxable as receipts of a  trade. Legislation will be introduced to ensure that payments received under  the Lump Sum Exit Scheme which relate to an eligible claim are neither receipts  of a trade nor miscellaneous income. This will allow the payments to be treated  as the proceeds from the disposal of a chargeable asset, as is currently the  case when Basic Payment Scheme entitlements are disposed of. In the case of a  company receiving Lump Sum Exit Scheme payments, the payments will be treated  as the proceeds from the disposal of an intangible asset.
Other
Other announced changes include:
    - The reform  of film, TV and video games tax relief to give expenditure credits instead of  an additional deduction from 1 April 2024.
- Extending  the temporary higher headline rates of relief for Theatre Tax Relief, Orchestra  Tax Relief and Museums and Galleries Exhibitions Tax Relief (MGETR) for two years  to 31 March 2025.
- Extension  of the period for which MGETR will be available for a further two years to 31  March 2026.