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UK SME Tax & Business Guide
A comprehensive beginner's guide to UK taxation for small and medium enterprises. From choosing the right business structure and understanding Income Tax, NICs, Corporation Tax, and VAT, to mastering Making Tax Digital and legitimate tax planning strategies — this course covers everything you need to know for the 2025/26 and 2026/27 tax years.
14
Modules
6-8 hrs
Duration
2026/27
Tax Year
Free
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Course Modules
Click on each module to expand the content.
1
The UK Tax System — An Overview
▼
The Two Key Government Bodies
- HMRC — His Majesty's Revenue and Customs. The UK's tax authority responsible for collecting all taxes.
- Companies House — The registrar of companies. If you operate a limited company, you must file annual returns and accounts here.
Key Concept: Sole traders deal only with HMRC. Limited companies must deal with both HMRC and Companies House.
The UK Tax Year
| Period | Runs From | Applies To |
|---|---|---|
| Personal Tax Year | 6 April – 5 April | Individuals (Income Tax, NI, CGT) |
| Financial Year | 1 April – 31 March | Corporation Tax for companies |
Taxes That Affect UK Businesses
- Income Tax — on personal income (salary, self-employment profits, rental, dividends)
- National Insurance — contributions by employees, employers, and the self-employed
- Corporation Tax — tax on limited company profits
- VAT — consumption tax on most goods and services
- Capital Gains Tax — tax on profit from selling assets that have increased in value
The Basic Logic of UK Taxation
Formula: Income − Allowable Deductions = Taxable Income × Tax Rate = Tax Due
The UK operates a self-assessment system — you must calculate and file your own tax. Failure to register and file can result in penalties, even if no tax is actually owed.
2
Choosing Your Business Structure
▼
Sole Trader
The simplest structure. No legal distinction between you and your business. Register free with HMRC for Self Assessment.
- You pay Income Tax + Class 2 & Class 4 NI on profits
- Advantages: free setup, minimal admin, full control, privacy
- Disadvantages: unlimited liability, potentially higher tax at higher profits
Example: Sarah earns £45,000 freelancing, with £10,000 in expenses. Taxable profit = £35,000. Income Tax = £4,486, NI = £1,528. Total tax ~£6,014 (effective rate ~17.2%).
Limited Company
A separate legal entity with limited liability protection. Register with Companies House (from £100 online).
- Company pays Corporation Tax (19%–25%) on profits
- Director pays personal tax on salary and dividends extracted
- Often more tax-efficient above ~£50,000 profits
Quick Decision Guide
| Your Situation | Recommended |
|---|---|
| Just starting out, income uncertain | Sole Trader |
| Annual profits below £30,000 | Sole Trader |
| Profits consistently above £50,000 | Limited Company |
| Business carries meaningful legal risk | Limited Company |
| Going into business with others | Partnership or LLP |
Tip: Review your structure annually. It's very common to start as a sole trader and incorporate later once profits grow.
3
Income Tax
▼
Personal Allowance & Tax Bands (2025/26 & 2026/27)
| Band | Income Range | Rate |
|---|---|---|
| Personal Allowance | £0 – £12,570 | 0% |
| Basic Rate | £12,571 – £50,270 | 20% |
| Higher Rate | £50,271 – £125,140 | 40% |
| Additional Rate | Over £125,140 | 45% |
These thresholds are frozen until 2030/31, creating "fiscal drag" as wages rise.
The £100,000 Trap
Warning: For every £2 earned above £100,000, your Personal Allowance is reduced by £1. Income between £100,000 and £125,140 is effectively taxed at 60% — higher than even the Additional Rate. Pension contributions can bring income back below £100k and restore the allowance.
Dividend Tax Rates
| Band | 2025/26 | 2026/27 | Change |
|---|---|---|---|
| Dividend Allowance | £500 tax-free | £500 tax-free | No change |
| Basic Rate | 8.75% | 10.75% | +2% |
| Higher Rate | 33.75% | 35.75% | +2% |
| Additional Rate | 39.35% | 39.35% | No change |
4
National Insurance Contributions
▼
NIC Classes (2025/26)
| Class | Who Pays? | Rate / Amount |
|---|---|---|
| Class 1 (Employee) | Employees | 8% (£12,570–£50,270); 2% above |
| Class 1 (Employer) | Employers | 15% on earnings above £5,000 |
| Class 2 | Self-employed | £3.50/week (~£182/year) |
| Class 4 | Self-employed | 6% (£12,570–£50,270); 2% above |
| Class 3 | Voluntary | £17.75/week |
Tip: You need 35 qualifying years of NI to receive the full State Pension. Check your record at www.gov.uk/check-national-insurance-record.
5
The PAYE System & Employer Obligations
▼
How PAYE Works
Employers deduct Income Tax and employee NI from wages before payment, then remit to HMRC via Real Time Information (RTI).
- Register for PAYE before your first employee's payday
- Calculate and deduct Income Tax + employee NI from each payment
- Calculate and pay employer NI on top of wages
- Submit Full Payment Submission (FPS) each pay date
- Pay HMRC total deductions monthly or quarterly
- Issue P60 to each employee at year-end
Employer NI Changes (April 2025 onwards)
| Item | 2024/25 (Old) | 2025/26 (New) |
|---|---|---|
| Employer NI rate | 13.8% | 15% |
| Secondary Threshold | £9,100/year | £5,000/year |
| Employment Allowance | £5,000 (NI bill < £100k) | £10,500 (no upper limit) |
Note: If the company's only employee is the director (no other staff), it cannot claim the Employment Allowance.
National Living Wage (from April 2026)
| Age Group | 2025/26 | 2026/27 |
|---|---|---|
| 21 and over | £12.21/hr | £12.71/hr |
| 18–20 | £10.00/hr | £10.85/hr |
| 16–17 / Apprentices | £7.55/hr | £8.00/hr |
6
Corporation Tax
▼
Corporation Tax Rates
| Profit Range | Effective Rate |
|---|---|
| Up to £50,000 | 19% (Small Profits Rate) |
| £50,001 – £250,000 | 19%–25% (Marginal Relief) |
| Over £250,000 | 25% (Main Rate) |
Key Concept: Marginal Relief means each additional pound of profit in the £50k–£250k band is taxed at approximately 26.5%, smoothing the transition from 19% to 25%.
Extracting Profits from Your Company
- Salary — deductible for Corporation Tax; subject to Income Tax + NI
- Dividends — from after-tax profits; lower tax rates; no NI
- Pension contributions — fully deductible; no NI; funds locked until pension age
- Expense reimbursement — must be genuine business expenses with receipts
Example: ABC Ltd has £80,000 profit. With Marginal Relief, effective tax rate is ~21.2% = ~£17,000 Corporation Tax. A sole trader on the same £80,000 would pay ~£21,500 in Income Tax + NI.
7
Value Added Tax (VAT)
▼
Registration Thresholds
- Compulsory: Taxable turnover exceeds £90,000 in any rolling 12-month period
- Voluntary: You can register at any level (useful if customers are VAT-registered)
- Deregistration: Turnover drops below £88,000
VAT Rates
| Rate | % | Examples |
|---|---|---|
| Standard | 20% | Most goods and services |
| Reduced | 5% | Domestic energy, children's car seats |
| Zero | 0% | Most food, children's clothing, books |
| Exempt | N/A | Financial services, insurance, education |
Important: Zero-rated (within VAT system, can reclaim input VAT) is fundamentally different from Exempt (outside VAT system, cannot reclaim input VAT).
Small Business VAT Schemes
- Flat Rate Scheme: Pay a fixed % of gross turnover (up to £150k turnover)
- Cash Accounting: Account for VAT when money is received/paid (up to £1.35m)
- Annual Accounting: One VAT return per year instead of four (up to £1.35m)
8
Capital Gains Tax (CGT)
▼
CGT Rates (2025/26 & 2026/27)
| Taxpayer Status | Rate | Annual Exempt Amount |
|---|---|---|
| Basic rate taxpayer | 18% | £3,000 |
| Higher / Additional rate | 24% | £3,000 |
Business Asset Disposal Relief (BADR)
Reduced CGT rate when selling your business or qualifying shares. Lifetime limit: £1,000,000.
2025/26
BADR rate: 14%
2026/27
BADR rate: 18%
Timing matters: On £1m of qualifying gains, the difference between 14% and 18% = £40,000 extra tax. Seek advice before April 2026 if planning a disposal.
9
Making Tax Digital (MTD)
▼
Implementation Timeline
April 2019
MTD for VAT — already in effect
April 2026
MTD for ITSA — self-employed / landlords with income > £50,000
April 2027
Threshold reduces to > £30,000
April 2028
Threshold reduces to > £20,000
What Changes?
Instead of one annual return, you must submit four quarterly updates plus one end-of-period statement, using MTD-compatible software.
| Quarter | Period | Deadline |
|---|---|---|
| Q1 | 6 Apr – 5 Jul | 7 August |
| Q2 | 6 Jul – 5 Oct | 7 November |
| Q3 | 6 Oct – 5 Jan | 7 February |
| Q4 | 6 Jan – 5 Apr | 7 May |
| Final declaration | Full year | 31 January |
Good news: HMRC has confirmed that late filing penalties will NOT be imposed for quarterly updates during 2026/27 (the first year). The new penalty regime takes full effect from April 2027.
10
Allowable Expenses & Record-Keeping
▼
Common Allowable Expenses
| Expense | Sole Trader | Ltd Co | Notes |
|---|---|---|---|
| Premises rent | Yes | Yes | Home office — proportional only |
| Stock / materials | Yes | Yes | Stock must be valued at year-end |
| Vehicle costs | Mileage | Mileage | 45p/mile (first 10k); 25p thereafter |
| Accountancy fees | Yes | Yes | |
| Director's own salary | No | Yes | Sole trader profit = personal income |
| Client entertainment | No | No | Not deductible for tax |
Working from Home
- Simplified method: £6/week flat rate (£312/year), no receipts needed
- Actual cost method: Calculate business proportion of household costs (higher but requires records)
Essential Record-Keeping Rules
- Separate business and personal bank accounts
- Keep evidence for every transaction (invoices, receipts, statements)
- Retain records for six years
- Record transactions promptly — MTD makes real-time bookkeeping essential
Top 3 HMRC investigation triggers: mixing personal/business expenses, missing invoices or receipts, and unreported cash income.
11
Key Dates & Deadlines
▼
Self Assessment Calendar
6 April
New tax year begins
5 October
Register for Self Assessment (if newly self-employed)
31 October
Paper return filing deadline
31 January
Online filing deadline + tax payment + 1st Payment on Account
31 July
2nd Payment on Account due
Limited Company Deadlines
- 9 months + 1 day after year-end: Corporation Tax payment due
- 9 months after year-end: File accounts with Companies House
- 12 months after year-end: File CT600 with HMRC
- 14 days after anniversary: Confirmation Statement (£50)
Late Filing Penalties
| Delay | Penalty |
|---|---|
| 1 day late | £100 immediate |
| 3 months late | +£10/day (up to £900) |
| 6 months late | +5% of tax due (min £300) |
| 12 months late | +5% of tax due (min £300) |
12
Legitimate Tax Planning Strategies
▼
Use All Available Allowances
- Personal Allowance (£12,570): Ensure every eligible family member uses theirs
- Dividend Allowance (£500): Even small amounts should utilise this
- Trading Allowance (£1,000): Side income below £1,000 need not be declared
- ISA Allowance (£20,000): All income and gains within an ISA are completely tax-free
- CGT Exempt Amount (£3,000): Spread disposals across tax years
Pensions — A Powerful Tax Tool
- Personal contributions get tax relief (basic-rate: pay £80, government adds £20)
- Company pension contributions are Corporation Tax deductible and NI-free
- Annual allowance: £60,000 (with 3-year carry-forward)
Upcoming changes: From April 2027, pensions included in IHT. From April 2029, salary sacrifice pension contributions above £2,000/year subject to NI.
Director Remuneration Strategy
Common approach: Set salary at ~£12,570 (Personal Allowance) to avoid Income Tax and employee NI. Take additional profits as dividends. Top up with employer pension contributions. Review annually with your accountant.
13
Capital Allowances
▼
Types of Capital Allowances
- Annual Investment Allowance (AIA): 100% deduction on qualifying plant & machinery, up to £1,000,000/year
- Full Expensing (companies only): 100% first-year deduction on qualifying new plant & machinery (permanent)
- New 40% First-Year Allowance (Jan 2026): For unincorporated businesses & leasing businesses on main-rate assets
- Writing Down Allowance (WDA): Main rate reduces from 18% to 14% from April 2026; special rate remains 6%
- Zero-emission vehicles & EV charge points: 100% first-year allowance until March/April 2027
Note: The WDA main rate reduction from 18% to 14% (April 2026) means tax relief on capital expenditure not covered by AIA or Full Expensing will be spread over a longer period.
14
Timeline of Upcoming Tax Changes
▼
Key Changes by Date
Apr 2025
Employer NI ↑ 15%; Secondary Threshold ↓ £5k; EA ↑ £10,500; CGT unified 18%/24%; BADR 14%; NLW £12.21
Jan 2026
New 40% First-Year Allowance for plant & machinery
Feb 2026
Companies House fees increased (incorporation £100, Confirmation Statement £50)
Apr 2026
MTD for ITSA (>£50k); Dividend tax +2%; BADR 18%; WDA 18%→14%; NLW £12.71; CT late filing penalties double
Apr 2027
MTD threshold >£30k; Property/savings tax +2%; Cash ISA limit £12k (under 65s); Pensions in IHT
Apr 2028
MTD threshold >£20,000
Apr 2029
Salary sacrifice pension contributions above £2,000/year subject to NI
Planning ahead: Use this timeline as a reference for forward planning. Review your business structure and tax strategy annually with a qualified accountant.
Course Resources
Download Course Materials
Get the complete UK SME Tax & Business Guide (PDF, 36 pages).
Video Tutorial
Watch our comprehensive walkthrough of UK SME taxation fundamentals.
Need Professional Help?
Our qualified accountants can manage your company's tax affairs and ensure full compliance.
- ✓ Company formation & setup
- ✓ Corporation Tax returns
- ✓ Self Assessment filing
- ✓ VAT registration & returns
- ✓ Payroll & PAYE management
- ✓ Tax planning & optimisation
Resources
Download the full guide covering all 14 chapters with worked examples and tax tables.
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