Small Business Tax Tips UK 2026: Save Money and Stay Compliant
11 August 2026
Practical UK small business tax tips for 2026: allowances, deadlines, deductions, and ways to reduce your tax bill legally.
1. Choose the Right Business Structure for Tax Efficiency
Your legal structure determines how you pay tax. Sole traders pay Income Tax on profits via Self Assessment, while limited companies pay Corporation Tax on profits and then dividends tax on extraction. In 2026, Corporation Tax is 25% for profits over £250,000, but the small profits rate of 19% applies below £50,000. Sole traders face Income Tax rates up to 45% plus National Insurance. Consider which structure suits your profits and growth plans. If you are a high-earner with retained profits, a limited company can be more tax-efficient. However, ongoing filing duties and accountancy costs are higher. Review your structure annually with an accountant, especially as thresholds change.
2. Utilise Your Tax-Free Allowances and Reliefs
Every small business owner should make full use of tax-free allowances. For 2025/26, the Personal Allowance stands at £12,570, letting you earn this amount before paying Income Tax. The Trading Allowance lets you earn £1,000 of trading income tax-free – useful for hobby businesses or side income. If you run a limited company, remember the Dividend Allowance is £500 (from 2024/25), and the Annual Investment Allowance is £1 million for most plant and machinery. Also check the new Employment Allowance, which can reduce your Class 1 National Insurance by up to £10,000. These reliefs are often overlooked but can cut your bill significantly when used correctly.
3. Claim Every Legitimate Business Expense
To reduce your taxable profit, you must claim expenses that are 'wholly and exclusively' for business purposes. For sole traders, allowable costs include office rent, utilities, stock, equipment, travel (but not commuting), marketing, insurance, and staff salaries. If you work from home, you can claim a flat rate based on hours worked (£6 per week for 25+ hours) or actual costs. For limited companies, be particularly careful with entertaining costs – client entertaining is not deductible. Keep receipts and mileage logs. Many small businesses miss subscriptions, software costs, and home office shares, which can mount up. Use accounting software to track expenses throughout the year so you don't forget deductions at year-end.
4. Watch Key Deadlines and Payments on Account
Missing HMRC deadlines leads to automatic penalties. For sole traders and partnerships, the 2025/26 Self Assessment deadline is 31 January 2027 for online filing and payment. You'll also need to make two payments on account (31 January and 31 July) unless your tax bill is under £1,000. Limited companies must pay Corporation Tax within 9 months and 1 day of their accounting period end, and file accounts at Companies House within 9 months. Set reminders well in advance and consider setting aside money for tax regularly. If you expect your tax liability to drop in 2026/27, you can apply to reduce your payments on account by completing a SA303 form – just be careful not to underpay and incur interest.
5. Plan Ahead: Pensions, R&D Relief and Capital Allowances
Pension contributions are a powerful tax-planning tool. Sole traders can claim tax relief on personal contributions (up to £60,000 or 100% of earnings), while limited companies can make employer contributions which are deductible against Corporation Tax and usually avoid NICs. If you do research and development, check whether your business is eligible for R&D Tax Relief – the rates changed in 2023, with enhanced relief for SMEs and merged schemes for loss-making companies. Also time capital purchases wisely to maximise Capital Allowances. Spend on qualifying equipment before your year-end to accelerate relief. Early planning with a tax adviser can help you legitimately reduce your 2026 liability, so don't leave it too late.
FAQ
For sole traders and partnerships, the online Self Assessment deadline for the 2025/26 tax year is 31 January 2027. Paper returns must be filed by 31 October 2026. Limited companies must file their Company Tax Return and pay Corporation Tax within 9 months and 1 day after the accounting period ends.