Autumn Budget 2026 Explained: Key Tax Changes for UK Small Businesses, SMEs & Individuals

The Autumn Budget 2026 has now been announced, bringing a wide range of tax and financial changes for businesses and individuals.

While there were no sweeping increases to the headline rates of Income Tax, National Insurance or VAT, there is considerably more beneath the surface. Changes to business taxes, Capital Gains Tax reliefs, savings and property income, business rates and the way Self Assessment tax is paid could all have an impact over the coming years.

For owner-managed businesses in particular, the Budget is a reminder that tax changes rarely operate in isolation. A change affecting a director personally can influence how they take money from their company, while changes to capital allowances, employment costs or business rates can affect the company's cash flow.

This guide explains the most relevant Budget announcements in plain English and considers what practical steps businesses and individuals should be taking next.

1. Income Tax: headline rates stay the same, but some income will be taxed more

The headline rates of Income Tax have not increased. However, this does not necessarily mean that everyone's Income Tax position will remain unchanged.

Income Tax thresholds remain frozen, which means that as earnings increase, more income can gradually become taxable or move into a higher tax band. This is often referred to as fiscal drag.

There is also a significant change coming for savings and property income. From 6 April 2027, the rates applying to savings income will be 24% for basic-rate taxpayers, 44% for higher-rate taxpayers and 49% for additional-rate taxpayers. New property income rates are also due to be introduced at these levels in England, Wales and Northern Ireland.

For landlords, investors and business owners with significant savings, this makes reviewing your overall personal tax position increasingly worthwhile.

2. A higher trading allowance for small and side businesses

There is welcome simplification for some of the UK's smallest businesses.

From 6 April 2027, the trading allowance will increase from £1,000 to £3,000. The Self Assessment reporting threshold for trading income will also increase to £3,000.

For people earning relatively small amounts through a side business or occasional self-employment, this could reduce both tax and administration.

However, once a business starts growing, good bookkeeping remains important regardless of whether a Tax Return is immediately required. Accurate records help you understand whether the business is genuinely profitable and ensure you are prepared as turnover increases.

3. Important Capital Gains Tax changes for business owners

One of the Budget areas requiring particular attention from owner-managed businesses is Capital Gains Tax.

From 6 April 2027, the lifetime limit for Business Asset Disposal Relief, or BADR, is due to reduce from £1 million to £500,000. BADR can reduce the Capital Gains Tax due when qualifying business owners dispose of their business or shares.

For somebody considering selling or restructuring a business, this makes the timing of a transaction potentially important.

Alongside this, the government is introducing a new Founders' Relief for qualifying founders and early investors in certain high-growth companies, applying to qualifying disposals from 6 April 2027. This relief is intended to allow qualifying founders and early investors in certain high-growth companies to benefit from a reduced 10% Capital Gains Tax rate on qualifying gains of up to £10 million over their lifetime, subject to meeting the detailed eligibility conditions.

The detailed application of the relief is currently the subject of consultation.

The important message is not to rush a commercial decision simply because tax rules are changing. However, anyone already considering a sale, succession or restructuring should take professional advice early enough to understand the options.

4. Business investment and capital allowances

The Budget also contains changes relevant to businesses investing in equipment, machinery, and other qualifying assets.

Capital allowances effectively allow businesses to obtain tax relief on certain capital expenditure. Depending on the type of asset and the circumstances, this can include relief through the Annual Investment Allowance (AIA), full expensing, first-year allowances or writing-down allowances, which allow some or all of the cost of qualifying assets to be deducted from taxable profits.

This is an area where forward planning can be valuable. If you are considering significant expenditure, particularly around accounting periods or tax-year ends, understanding the tax treatment before making the purchase can help with both tax and cash-flow planning.

For growing SMEs, this is also why accounts should ideally be used for more than year-end compliance. Regular management accounts and forecasts can help a business decide whether an investment is affordable before considering the tax relief available.

5. Changes for innovative and growing businesses

There was some simplification for companies making Research and Development tax relief claims.

For R&D claims made on or after 1 April 2027, the requirement to submit a Claim Notification Form will be removed. The government also intends to simplify the Additional Information Form used in R&D claims from autumn 2027.

This may remove some administration, but companies should not interpret simplification as reduced scrutiny. Maintaining good records explaining the qualifying project, technological advancement and qualifying costs remains important.

For innovative SMEs, sound bookkeeping and accurate year-end accounts therefore remain an important foundation for a robust R&D claim.

6. Employers: don't ignore ‘small cost’ changes

Employers should look at the Budget alongside wider changes to employment costs.

One potentially useful change concerns business mileage. From 6 April 2027, the approved rate for business mileage above 10,000 miles will increase from 25p to 35p per mile.

Business owners should nevertheless consider employment costs as a whole rather than focusing on individual measures.

When wages, pension contributions, National Insurance, and employee benefits are combined, relatively small individual changes can produce a much larger increase in the annual cost of employing somebody.

For SMEs with employees, updating budgets and cash-flow forecasts before costs actually change can help avoid surprises.

7. Self Assessment payments are changing

One of the biggest longer-term administrative changes announced in the Budget affects people who make Self Assessment payments on account.

Currently, many taxpayers make payments towards their next tax bill twice each year.

From April 2029, the government intends to require taxpayers within the payments-on-account system to make more regular payments during the year. Payments are expected to be automated, with eligible taxpayers also able to choose payment through PAYE. Detailed implementation arrangements are still being developed.

Importantly, this changes the timing of tax payments rather than necessarily changing the final tax liability.

For sole traders, partners, landlords and other Self Assessment taxpayers, however, timing matters. Tax money that previously remained in your bank account until January or July could leave the account earlier.

That makes good cash-flow planning increasingly important.

8. What does the Budget mean for charities and CIOs?

For many charities and Charitable Incorporated Organisations, or CIOs, the direct tax announcements are less significant than their wider financial effects.

Charities employing staff, operating premises or delivering services in a higher-cost environment need to consider how changing employment and operating costs affect future budgets.

Trustees should ensure that budgets remain realistic and that they have sufficient visibility over cash reserves and future commitments.

Regular bookkeeping and management accounts can be particularly useful here. They allow trustees to compare actual income and expenditure against budget and identify emerging pressures before the year-end accounts are prepared.

9. Top tips following the Autumn Budget 2026

Review your forecasts: Update budgets and cash-flow forecasts for known changes rather than waiting until they take effect.

Consider business disposals early: If you are contemplating selling your company, shares or business, review the proposed BADR changes before 6 April 2027.

Look at personal and company tax together: Directors of owner-managed companies should consider salary, dividends, pensions and other personal income as part of one overall plan.

Review planned capital expenditure: Before making a significant purchase, establish which capital allowances are available and whether timing affects the relief.

Keep bookkeeping up to date: Reliable financial records make year-end filings easier, but more importantly give you useful information throughout the year.

Use management accounts as a decision-making tool: If costs, margins or cash flow are changing, monthly or quarterly accounts can identify the trend far sooner than annual accounts.

Plan for tax payments throughout the year: The Self Assessment changes reinforce the benefit of treating tax as a regular cash-flow commitment rather than a twice-yearly surprise.

10. How Halliday Styan Chartered Accountants can help

At Halliday Styan Chartered Accountants, we work with owner-managed businesses, growing SMEs, charities and individuals to turn changes like these into practical actions.

Our partners are Chartered Accountants with extensive experience, allowing us to bring the technical expertise and financial insight associated with larger organisations to smaller and growing businesses, while retaining the friendly, personal approach of an adviser who understands your business.

That can include keeping your bookkeeping and year-end accounts compliant and up to date, providing management accounts so you can understand performance throughout the year, helping with Self Assessment and company tax returns, and supporting businesses with forecasting and financial planning as they grow.

Not every Budget announcement will affect every taxpayer, and changing your plans purely for tax reasons is rarely sensible. The important thing is understanding which changes matter to you and having enough time to respond appropriately.

If you would like to understand what the Autumn Budget 2026 means for you or your business, we are always happy to have a friendly, practical conversation about your position and the steps worth considering.