Tax & Business Structure

The Annual Investment Allowance (AIA) gives businesses a 100% first-year tax deduction for qualifying plant and machinery purchases, up to a limit of £1 million per year. Unlike normal writing-down allowances spread over several years, the AIA lets the full cost of an eligible asset — such as machinery, tools, commercial vehicles and computer equipment — be deducted in the year of purchase, reducing the tax bill immediately. The AIA is available to most UK businesses, including sole traders, partnerships and limited companies. Certain assets are excluded, notably cars and assets used partly for private purposes.

Auto-enrolment is the legal requirement for UK employers to automatically enrol eligible workers into a qualifying workplace pension scheme without requiring the worker to opt in. Minimum contributions in 2025/26 are 5% from the employee and 3% from the employer, applied to qualifying earnings between the lower and upper thresholds. Workers aged 22 to State Pension age earning above £10,000 per year from a single employer are automatically enrolled; younger workers or those earning less can opt in. Employers must choose a compliant pension provider, manage ongoing re-enrolment every three years, and submit a declaration of compliance to The Pensions Regulator.

A beneficial interest is the right to benefit from an asset — such as receiving income, capital gains or occupation rights — even when legal title is held by another person or entity. In property co-ownership, a Declaration of Trust records beneficial shares separately from the names on the title deeds, which is important for tax planning between spouses or business partners. In company structures, beneficial ownership of shares determines dividend entitlement and is now publicly disclosed on the PSC register at Companies House. HMRC requires beneficial interests to be reflected in tax returns even where legal ownership differs.

Business Asset Disposal Relief (BADR), formerly called Entrepreneurs' Relief, reduces the capital gains tax rate to 10% on the first £1 million of qualifying business disposal gains over a lifetime. To qualify, individuals must own at least 5% of the shares and voting rights and be an officer or employee of the company for at least two years before the disposal date. Following the October 2024 Budget, the 10% rate increases to 14% from April 2025 and 18% from April 2026, reducing its attractiveness compared with the previous regime. The relief applies to disposals of the whole or part of a trading business, as well as assets used in a business upon its cessation.

Business rates (formally Non-Domestic Rates) are a property tax levied on most non-residential properties in England — shops, offices, warehouses, factories and some home-based businesses. They are calculated by multiplying the property's rateable value (set by the Valuation Office Agency) by a multiplier set each year by central government. Small businesses may qualify for Small Business Rate Relief (SBRR), which can reduce the bill to nil for properties with a rateable value below £12,000. Businesses can also appeal their rateable value if they believe it is too high.

The VAT cash accounting scheme allows businesses to account for VAT based on when payments are actually received and made, rather than the invoice date. This means VAT is not due to HMRC until the customer pays, which helps cash flow — particularly for businesses that extend credit to customers. The scheme is open to businesses with annual taxable turnover of £1.35 million or less; businesses must leave the scheme once turnover exceeds £1.6 million. It is most beneficial for businesses with slow-paying customers, though it means input VAT on purchases cannot be reclaimed until the business itself has paid the supplier.

A Community Interest Company is a UK limited company designed for social enterprise: assets and profits are dedicated to a community purpose rather than private gain. CICs are registered at Companies House and regulated by the CIC Regulator, who applies a Community Interest Test on incorporation. An asset lock prevents distribution of value to members beyond a capped dividend. CICs file an annual CIC34 report alongside accounts.

The Construction Industry Scheme is an HMRC tax-withholding regime for payments from contractors to subcontractors in UK construction. Contractors deduct 20% (verified) or 30% (unverified) from the labour element of each payment and remit it to HMRC. Gross payment status is available to subcontractors meeting turnover and compliance tests. CIS does not replace VAT or PAYE — it sits alongside them.

The Construction Industry Scheme (CIS) is an HMRC tax-deduction scheme for the construction sector. Contractors must register with HMRC and deduct money from subcontractors' payments before paying them — 20% for registered subcontractors and 30% for unregistered ones — and pass the deducted amounts to HMRC as advance payments against the subcontractor's tax and National Insurance. Subcontractors can register to reduce the deduction rate or apply for gross payment status if they meet turnover and compliance thresholds.

A Companies House number is the unique 8-character identifier assigned to every UK limited company, LLP and registered charity. It appears on the company's certificate of incorporation and must be displayed on letterheads, invoices and websites. The number never changes, even if the company is renamed. Public records — accounts, directors, charges — can be looked up free at find-and-update.company-information.service.gov.uk.

A Confirmation Statement (form CS01) is the annual filing every UK company and LLP must make at Companies House to confirm that registered information — directors, members, registered office, shareholders, PSCs and SIC codes — is up to date. The fee is £34 online (£62 paper) from May 2024. Failure to file is a criminal offence and can lead to strike-off.

The Construction Industry Scheme (CIS) is an HMRC regime under which contractors deduct money from subcontractor payments and pass it to HMRC as advance income tax. The deduction rate is 20% for registered subcontractors and 30% for those not registered — only the labour element of an invoice is deductible, not materials. Subcontractors must register with HMRC to receive the lower 20% rate, and those with a strong compliance record and sufficient turnover can apply for gross payment status (no deduction). The scheme applies to most construction work including building, demolition, installation and site preparation.

Corporation Tax is levied on the taxable profits of UK limited companies and some other organisations. From April 2023, the main rate is 25% for profits above £250,000, with a small-profits rate of 19% applying to profits up to £50,000 and marginal relief between the two thresholds. Companies must file a Company Tax Return (CT600) with HMRC within 12 months of the end of their accounting period and pay any tax due within 9 months and 1 day. Research and Development (R&D) tax credits can significantly reduce a company's Corporation Tax bill.

A director's loan account (DLA) records money lent between a director and their company, outside of salary, dividends or expenses. An overdrawn DLA (director owes the company) outstanding more than nine months after year-end attracts s455 Corporation Tax at 33.75%, plus a benefit-in-kind charge if the balance exceeds £10,000. DLA balances must be disclosed in statutory accounts.

The dividend allowance is the amount of dividend income a UK taxpayer can receive before paying dividend tax. It was reduced to £500 for 2024/25 and 2025/26, down from £2,000 in 2022/23. Dividends above the allowance are taxed at 8.75% (basic rate), 33.75% (higher rate) or 39.35% (additional rate) — all higher than equivalent savings rates. Company directors who pay themselves partly through dividends must track their allowance carefully, particularly when dividends combine with other income. Dividends are paid from post-corporation-tax profits and do not attract National Insurance.

The Enterprise Investment Scheme (EIS) offers UK investors 30% income tax relief on investments of up to £1 million per tax year (£2 million for knowledge-intensive companies) in qualifying growing businesses. Qualifying shares must be held for at least three years; after this period, any gains are exempt from CGT and losses can be offset against income tax. EIS also provides inheritance tax relief via Business Property Relief. The company must be an unquoted trading business with gross assets below £15 million and fewer than 250 full-time employees.

Going concern is the accounting assumption that a business will continue operating for the foreseeable future — typically at least 12 months from the balance-sheet date. Directors must assess and disclose material uncertainties in the accounts. If the going concern basis is inappropriate, accounts must be prepared on a break-up basis. Auditors test the assumption explicitly.

HM Revenue & Customs (HMRC) is the UK government department responsible for collecting taxes, administering benefits, and enforcing tax and customs law. HMRC oversees Income Tax, Corporation Tax, VAT, PAYE, National Insurance, Capital Gains Tax, Inheritance Tax and many other levies. It also administers the Construction Industry Scheme and Making Tax Digital programme. Businesses and self-employed individuals interact with HMRC to register for tax, file returns, make payments and claim reliefs. HMRC has wide-ranging powers to investigate tax affairs and impose penalties for non-compliance.

IR35 is HMRC's "off-payroll working" legislation, designed to ensure contractors who work like employees pay broadly the same tax as employees. If an engagement is caught by IR35, the contractor's personal service company must pay Income Tax and National Insurance on the income as though the contractor were directly employed. Since April 2021, medium and large private-sector clients are responsible for determining IR35 status and, where necessary, deducting tax at source. Public-sector clients have had the same obligation since 2017.

An IR35 Status Determination Statement (SDS) is the written conclusion a client must produce — and pass down the supply chain — when engaging a contractor through an intermediary under the off-payroll rules. The SDS must give reasons and be issued before the contract starts. HMRC's online CEST tool offers one route, though tribunal cases continue to refine the substantive employment-status tests.

A Limited Liability Partnership combines the operational flexibility of a partnership with the limited liability of a company. LLPs are registered at Companies House and file annual accounts and confirmation statements. Members are taxed as self-employed partners under Self Assessment, but the LLP itself is a separate legal entity that can hold property and sue or be sued. Professional service firms (solicitors, accountants) are the most common adopters.

A private limited company (Ltd) is a legal structure that gives a business a separate legal identity from its owners. Shareholders' liability is limited to the value of their unpaid shares, so personal assets are generally protected if the business fails. Directors must file accounts and a confirmation statement with Companies House each year, and the company pays Corporation Tax on its profits rather than Income Tax. An Ltd structure is often chosen when a business grows beyond sole-trader scale, seeks outside investment, or needs the credibility of a registered company.

Making Tax Digital (MTD) is HMRC's long-running programme to move tax record-keeping and submissions online. MTD for VAT has been mandatory for all VAT-registered businesses since April 2022, requiring compatible accounting software to maintain digital records and file returns. MTD for Income Tax Self Assessment (ITSA) is planned for April 2026 for self-employed people and landlords with qualifying income above £50,000, with lower thresholds phased in subsequently. Businesses must use HMRC-recognised software and cannot use spreadsheets as a standalone solution.

Making Tax Digital for Income Tax Self Assessment (MTD ITSA) requires self-employed individuals and landlords with qualifying income above £50,000 to keep digital records and submit quarterly updates to HMRC from April 2026, with lower thresholds phased in subsequently. Compatible software — such as Xero, QuickBooks or FreeAgent — replaces the traditional annual Self Assessment return for affected taxpayers. Businesses must store their records digitally throughout the year and send four quarterly summaries plus a final declaration each tax year. The programme is a continuation of the broader Making Tax Digital initiative already mandatory for VAT-registered businesses.

HMRC's Approved Mileage Allowance Payment (AMAP) rates for business travel are 45p per mile for the first 10,000 miles and 25p per mile thereafter for cars and vans, with 24p for motorcycles and 20p for bicycles. Employees who use their own vehicle for business journeys can claim Mileage Allowance Relief (MAR) on the difference between HMRC's approved rate and any lower reimbursement their employer pays. Self-employed individuals can instead deduct the flat mileage rate directly from business profits without needing to track actual running costs.

National Insurance (NI) contributions fund state benefits including the State Pension, Statutory Sick Pay and the NHS. Employees pay Class 1 NI on earnings above the Primary Threshold; employers pay additional Class 1 contributions. Self-employed people pay Class 2 (a flat weekly rate) and Class 4 (a percentage of profits above a threshold). NI is administered by HMRC and deducted through PAYE for employees. The number of qualifying years of NI contributions determines entitlement to the full new State Pension, making it important to track gaps in your record.

Self-employed individuals pay two classes of National Insurance. Class 2 was a flat weekly contribution (£3.45 per week in 2023/24) that built entitlement to the State Pension and contributory benefits; from April 2024 Class 2 was effectively abolished for those with profits above the small profits threshold, with State Pension entitlement instead credited automatically via Self Assessment. Class 4 is a percentage of profits between the lower profits limit and upper profits limit, set at 6% in 2024/25 (reduced from 9% in April 2024). Those with profits below the small profits threshold can pay voluntary Class 3 contributions to protect their State Pension record.

Off-payroll working is HMRC's collective term for the rules applying where a worker provides services through an intermediary (typically a personal service company) but would otherwise be regarded as an employee. Since April 2017 (public sector) and April 2021 (medium/large private sector), the client is responsible for assessing status and operating PAYE if the engagement is inside IR35.

Pay As You Earn (PAYE) is HMRC's system for collecting Income Tax and National Insurance from employees' wages before the money reaches them. Employers deduct the correct amounts each pay period and transfer them to HMRC by the 19th (22nd if paying electronically) of the following month. PAYE also covers statutory payments such as Statutory Sick Pay and Statutory Maternity Pay. Any business hiring staff must register as an employer with HMRC and operate PAYE from the first payday.

Research and Development (R&D) tax credits are an HMRC incentive allowing qualifying UK companies to deduct an enhanced amount of R&D expenditure from taxable profits, or claim a cash credit if loss-making. From April 2024, the previous SME and RDEC schemes merged into a single scheme offering a 20% above-the-line credit for most companies; an enhanced rate of 27% applies to R&D-intensive SMEs that spend more than 30% of total expenditure on qualifying R&D. Qualifying costs include staff wages, software, materials consumed in research and subcontracted work. Claims must be submitted within two years of the end of the accounting period.

The Seed Enterprise Investment Scheme (SEIS) offers 50% income tax relief to individual investors who subscribe for qualifying shares in early-stage UK companies. Gains on SEIS shares held for at least three years are exempt from capital gains tax, and losses can be offset against income. From April 2023, the maximum investment qualifying for SEIS relief increased to £200,000 per investor per tax year, and the company limits were also raised. The company must be carrying on a qualifying trade, have gross assets below £350,000 and fewer than 25 full-time employees at the time of investment.

Self Assessment is HMRC's system for collecting Income Tax from people whose tax cannot be fully collected through PAYE — chiefly the self-employed, company directors, landlords and those with income over £100,000. You must register, complete an online tax return each year (deadline: 31 January following the tax year end), and pay any tax owed by the same date. A further payment on account is usually required by 31 July. Failure to file on time incurs automatic £100 penalties, with additional charges for prolonged delays.

A sole trader is the simplest form of self-employment in the UK. You trade as an individual, keeping all profits after tax but also bearing personal liability for all debts. You must register with HMRC and submit a Self Assessment tax return each year, paying Income Tax on profits and Class 2/4 National Insurance. There is no requirement to register with Companies House, and there is far less administrative burden than running a limited company. Many tradespeople, consultants and freelancers start out as sole traders.

A sole trader is an individual trading in their own name; they keep all profits but bear unlimited personal liability for debts. A limited company is a separate legal entity registered at Companies House, with liability capped at shareholders' investment. Sole traders pay Income Tax and Class 2/4 National Insurance via Self Assessment; limited companies pay Corporation Tax and directors take income as salary and dividends. The choice affects tax efficiency, credibility, admin burden and personal risk.

IR35 (also known as the off-payroll working rules) determines whether a subcontractor providing services through their own limited company is treated as employed or self-employed for tax purposes. Since April 2021, medium and large private-sector clients are responsible for making the status determination. Inside-IR35 engagements attract PAYE and NIC deductions at source. Sole traders are outside IR35 but may still face employment-status tests.

A tax code is the set of numbers and letters HMRC issues to tell an employer or pension provider how much tax-free Personal Allowance an individual gets under PAYE. The standard code for 2024/25 is 1257L, meaning £12,570 of tax-free income. Letters carry meaning — e.g. BR taxes all income at basic rate, K codes add untaxed income, and an emergency code (W1/M1) is temporary. Wrong codes are a common cause of over- or under-payment of tax.

A Unique Taxpayer Reference (UTR) is a 10-digit number issued by HMRC to identify individuals and companies for tax purposes. Self-employed people receive a UTR when they register for Self Assessment; companies get one automatically on incorporation. The UTR appears on tax returns, notices to file, and correspondence from HMRC. Subcontractors working in the construction industry must quote their UTR when registering for the CIS Scheme so contractors can verify their tax status before making payments.

Value Added Tax (VAT) is a consumption tax levied on most goods and services sold in the UK. The standard rate is 20%, with a reduced rate of 5% for items such as domestic energy and children's car seats, and a zero rate for essentials like food and children's clothing. Businesses with taxable turnover above the registration threshold (£90,000 from April 2024) must register for VAT with HMRC, charge it on sales, and submit periodic returns. Registered businesses can also reclaim VAT paid on eligible purchases.

The VAT Flat Rate Scheme (FRS) allows eligible businesses to pay a fixed percentage of their gross (VAT-inclusive) turnover to HMRC instead of calculating VAT on every individual transaction. The flat rate percentage varies by trade sector (for example, 12.5% for a management consultant). The scheme is available to businesses with taxable turnover up to £150,000 and simplifies VAT accounting, though businesses cannot reclaim input VAT on most purchases. Limited cost traders — those spending less than 2% or £1,000 of their turnover on goods — must use a flat rate of 16.5%, which often makes the scheme unviable for service businesses.

The VAT registration threshold is the level of taxable turnover above which a UK business must register for VAT with HMRC and begin charging 20% (standard rate) on eligible supplies. From April 2024 the threshold is £90,000 on a rolling 12-month basis, raised from £85,000. Businesses that exceed the threshold must register within 30 days of the end of the month in which they exceed it, or within 30 days if they anticipate exceeding it within the next 30 days alone. Voluntary registration below the threshold is permitted and allows input VAT recovery on purchases.

The construction VAT reverse charge, in force since March 2021, shifts responsibility for declaring VAT from the supplier to the customer on most B2B CIS-reportable construction services. The supplier issues an invoice marked "reverse charge" with no VAT amount; the customer self-accounts. End users (typically the property owner) and intermediary suppliers are excluded.

The UK VAT registration threshold is the level of taxable turnover above which a business must register for VAT with HMRC. As of April 2024 it stands at £90,000 on a rolling 12-month basis. Businesses may also register voluntarily below the threshold to reclaim input VAT. The current standard VAT rate is 20%, with reduced (5%) and zero rates for specific goods and services.