Two builders. Same turnover. Same profit. One pays £9,200 in tax. The other pays £3,100. The difference isn’t luck. It’s a phone call to an accountant who actually knows the reliefs.
Every year, UK businesses hand HMRC money they didn’t have to. Not through fraud. Through silence. Nobody told them the trading allowance existed. Nobody reviewed whether the company’s qualifying software development work met the R&D conditions. Nobody claimed the capital allowance on the van sitting in their yard.
Tax breaks for businesses in the UK are not loopholes. They’re written into law on purpose. These reliefs are provided within UK tax legislation, but each claim must meet the relevant conditions. So why don’t most businesses claim them? Because nobody asks the right question at the right time.
This guide explains the main tax breaks available to UK businesses, who may qualify, the current rules and the evidence needed to support each claim correctly.
What Are Tax Breaks for Businesses?
“Tax breaks” covers several ways to reduce a tax liability:
• Tax deductions reduce taxable profit, such as allowable running costs.
• Tax reliefs are specific measures providing a tax benefit, such as R&D tax relief.
• Tax allowances give qualifying investment special treatment, such as capital allowances.
• Employer or property reliefs may reduce National Insurance or business rates.
HMRC separates its guidance by business structure because the claims available to a sole trader are not always the same as those available to a limited company.
A £1,000 deduction does not save £1,000 of tax. It reduces taxable profit, so the saving depends on the tax rate. For companies in 2026/27, the small profits rate is 19%, the main rate is 25%, and marginal relief applies between the relevant profit limits.
1. Claim Every Allowable Business Expense
One of the simplest ways to avoid overpaying tax is to ensure that all qualifying business costs are recorded.
Common allowable expenses can include:
• office and stationery costs;
• business insurance;
• accountancy and professional fees;
• software subscriptions;
• advertising and marketing;
• telephone and internet costs;
• business travel;
• relevant professional subscriptions;
• business banking charges;
• qualifying training; and
• costs relating to working from home.
The expense must be incurred for the business. HMRC also distinguishes between revenue expenditure and capital expenditure. Day-to-day running costs may be deductible, while longer-term assets may need to be claimed through capital allowances. Some costs are specifically disallowed; client entertaining is a common example for companies.
A consultancy may overlook software, memberships, cyber insurance and home-working costs. Together they can materially affect taxable profit. Accurate professional bookkeeping makes it easier to identify qualifying costs before accounts and tax returns are finalised.
Evidence to keep: invoices, receipts, bank records and the business purpose. For mixed-use costs, retain the business-use calculation.
(Source: HMRC allowable expenses for self-employed businesses)
2. Capital Allowances: A Major Tax Break for Business Investment
Purchasing equipment does not always result in an ordinary business expense deduction. Instead, relief may be available through capital allowances.
Qualifying assets may include machinery, tools, computers, office equipment and certain business vehicles.
Annual Investment Allowance
The Annual Investment Allowance allows most businesses to deduct the full value of qualifying plant and machinery, subject to an annual limit of £1 million.
The allowance is available to many sole traders, partnerships and limited companies, although cars do not normally qualify. Mixed partnerships and assets with private use may also require special consideration.
(Source: HMRC: Annual Investment Allowance)
Full expensing
Qualifying companies may claim full expensing, providing a 100% first-year deduction for certain new and unused plant and machinery. Full expensing is available to companies rather than sole traders and partnerships, and exclusions apply.
(Source: HMRC: Full expensing)
New 40% first-year allowance
A new 40% first-year allowance applies to qualifying new and unused main-rate plant and machinery expenditure incurred on or after 1 January 2026.
The main writing-down allowance rate also reduced from 18% to 14% from 1 April 2026 for corporation tax and 6 April 2026 for income tax.
This makes it especially important to review which capital allowance gives the most appropriate result rather than automatically applying one treatment to every asset.
(Source: HMRC: 40% first-year allowance)
Evidence to keep: purchase invoices, finance agreements, asset descriptions, purchase dates, dates brought into business use and calculations of any private use.
3. R&D Tax Relief: Innovation Does Not Always Look Like a Laboratory
Research and development tax relief is not limited to pharmaceutical laboratories or major technology companies.
Qualifying R&D may take place where a company is attempting to achieve an advance in science or technology while resolving scientific or technological uncertainty.
Projects could potentially involve:
• developing software;
• designing technical systems;
• testing new materials;
• improving manufacturing processes;
• creating technically improved products; or
• attempting solutions that are not readily available to a competent professional.
Commercial innovation alone is not enough. A new product, website or service will not automatically qualify simply because it is new to the business or its customers.
For accounting periods beginning on or after 1 April 2024, the merged R&D Expenditure Credit generally provides a taxable credit calculated at 20% of qualifying expenditure. Qualifying loss-making R&D-intensive SMEs may claim an additional deduction of 86% and a payable credit worth up to 14.5% of the surrenderable loss.
The R&D additional information form must be submitted before or on the same day as the company tax return. Otherwise, the claim may be removed.
Evidence to keep: technical reports, tests, design changes, time records, costs and an explanation of the advance and uncertainty.
4. Employment Allowance: Reduce Employer National Insurance
Eligible employers can reduce their secondary Class 1 National Insurance liability through Employment Allowance.
For the 2026/27 tax year, the maximum Employment Allowance is £10,500. The allowance is used through payroll until the employer’s qualifying National Insurance liability is reduced by the full available amount or the tax year ends.
(Source: HMRC: Employment Allowance)
Eligibility must be checked carefully. For example, a company cannot normally claim where it has only one employee liable for employer National Insurance and that employee is also the sole director.
Connected companies and charities may also need to determine which entity is entitled to make the claim. Regular payroll processing can help ensure that eligibility is reviewed and the allowance is claimed through the correct payroll.
Evidence to keep: payroll reports, employee records, employer National Insurance calculations and information concerning connected companies.
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5. Tax Relief on Employer Pension Contributions
Employer pension contributions can form part of a tax-efficient remuneration and retirement strategy. A contribution to a registered pension scheme may be deductible where it is incurred wholly and exclusively for the business.
Timing matters. HMRC generally gives relief for the period in which the contribution is actually paid, not merely accrued in the accounts.
The standard pension annual allowance remains £60,000 for 2026/27, but tapering, the money purchase annual allowance and the individual’s wider pension position can affect the result.
For an owner-managed company, a large contribution should be considered alongside:
- salary and dividends;
- the director’s duties;
- the overall remuneration package;
- company cash flow;
- previous pension contributions; and
- personal retirement objectives.
Employer contributions should also be coordinated with the company’s pension setup and filing responsibilities.
Evidence to keep: provider statements, payment confirmations, approval records and remuneration calculations.
6. VAT Reliefs and Planning Opportunities
Business taxes in the UK are not limited to Income Tax and Corporation Tax. Incorrect VAT treatment can create unnecessary costs, penalties and cash-flow problems.
A VAT review may consider:
• input VAT recovery;
• VAT registration timing;
• pre-registration VAT;
• the correct rate for goods and services;
• partial exemption;
• cash accounting;
• annual accounting;
• margin schemes; and
• the Flat Rate Scheme.
The compulsory VAT registration threshold is currently based on taxable turnover exceeding £90,000. A business may generally join the Flat Rate Scheme where expected VAT-taxable turnover is £150,000 or less, excluding VAT.
The Flat Rate Scheme is not automatically cheaper. Businesses with substantial input VAT, unusual supplies or limited-cost-trader status may achieve a worse result than under standard VAT accounting.
Evidence to keep: valid VAT invoices, import documents, sales records, credit notes and calculations supporting the VAT treatment.
7. Corporation Tax Planning: Timing Can Matter
Tax planning should take place before the accounts and company tax return are finalised.
The timing of the following may affect the result:
• equipment purchases;
• pension contributions;
• staff bonuses;
• loss claims;
• R&D expenditure;
• capital disposals; and
• accounting period changes.
For the financial year beginning 1 April 2026, the Corporation Tax main rate is 25% and the small profits rate is 19%. Marginal Relief can apply where profits fall between £50,000 and £250,000. These limits may be reduced where the company has associated companies.
However, spending money solely to obtain a tax deduction rarely makes commercial sense. A £10,000 expense does not create a £10,000 tax saving.
Before committing to expenditure, ask:
Would the business still make this purchase if no tax relief were available?
Advance Corporation Tax planning should support a sound commercial decision rather than create the reason for the purchase.
Tax Breaks for Sole Traders, Partnerships and Limited Companies Are Not the Same
|
Business type |
Common areas to review |
|---|---|
|
Sole trader |
Expenses, home working, mileage, capital allowances and personal pensions |
|
Partnership |
Expenses, capital allowances, partner costs and profit allocation |
|
Limited company |
Corporation Tax deductions, capital allowances, R&D, employer pensions and benefits |
|
Employer |
Employment Allowance, payroll reliefs, benefits, pensions and mileage |
|
VAT-registered business |
Input VAT, VAT schemes and registration timing |
Common Tax Breaks Businesses Miss
Businesses frequently overlook:
• small software and online-service costs;
• professional memberships and relevant training;
• business mileage and home-working costs;
• expenses paid personally by directors or partners;
• capital allowances on equipment and fixtures;
• employer pensions and Employment Allowance;
• business rates relief and qualifying R&D activity;
• recoverable input VAT; and
• corrections or claims relating to earlier periods.
A bank transaction alone rarely proves the tax treatment. The business should show what was purchased, why it was needed, who used it, when it was incurred and how the claim was calculated.
Do Not Miss Valuable Tax Reliefs
The right tax breaks will depend on your business structure, expenses, investments, employees and VAT position. Reviewing these areas before filing your accounts or tax return can help identify missed claims and ensure that the correct evidence is available.
Think your business may be paying more tax than necessary? Speak to an accountant for a review of your current tax position.
Tax rules may change, and the correct treatment will depend on your circumstances.
