November 2025 Budget: Key Impacts for UK Micro and Small Business Owners

Executive Summary

The November 2025 budget presents significant fiscal and policy changes that will directly impact UK micro and small business owners. While the budget aims to address fiscal consolidation and welfare reversals, it introduces several tax increases and compliance measures that will affect business profitability, investment decisions, and operational costs.

1. EMPLOYER NATIONAL INSURANCE CONTRIBUTIONS (NICs)

Current Situation and Previous Changes

The October 2024 Autumn Budget increased employer NICs significantly. The November 2025 budget extends the freeze on the secondary threshold (the point at which employers start paying NICs).

Key Impact

• Secondary threshold freeze extended for an additional three years beyond the previous announcement

• This freeze prevents the threshold from rising with inflation, effectively increasing the tax burden on employers over time

• The freeze compounds the impact of the October 2024 rate increase from 10% to 15% on earnings above £9,100 per employee

Business Implication

Small business owners with employees face a sustained and increasing cost burden. The combination of the higher rate and the frozen threshold means that as wages grow with inflation, a larger proportion of payroll becomes subject to the higher 15% rate. This particularly affects labour-intensive small businesses.

2. SALARY-SACRIFICED PENSION CONTRIBUTIONS

New Policy (From April 2029)

Salary-sacrificed pension contributions above £2,000 per employee per year will no longer be exempt from National Insurance contributions. These will now be treated as ordinary employee pension contributions, subject to both employer and employee NICs.

Costing

• Raises £4.7 billion in 2029-30

• Raises £2.6 billion in 2030-31

Business Implications

• Increased employer costs: Businesses offering salary-sacrifice pension schemes will face additional NIC liabilities on contributions above £2,000

• Potential employee resistance: Employees may see reduced take-home pay if employers don't absorb the additional cost

• Behavioural responses: The OBR estimates that employers may pass 76% of the additional cost to employees through:

• Lower ordinary employer pension contributions (50%)

• Lower salaries and bonuses (50%)

• Scheme complexity: Employers may need to restructure pension arrangements or move to ordinary pension contributions

Uncertainty

The yield is subject to significant uncertainty regarding employer and employee responses. Some employers may switch to ordinary contributions or employees may move to relief-at-source (RAS) schemes, creating administrative complexity.

3. CAPITAL ALLOWANCES: WRITING DOWN ALLOWANCE (WDA) REDUCTION

Policy Change (From April 2026)

The writing down allowance main rate is being reduced from 18% to 14% from April 2026, alongside a new 40% first-year allowance from January 2026.

Costing

•Raises £1.5 billion in 2029-30

•Applies to both corporation tax-paying companies and unincorporated businesses (sole traders and partnerships)

What This Means

Writing down allowances allows businesses to deduct a percentage of the cost of capital assets from taxable profits each year. Lowering the main rate reduces the tax relief available for capital expenditure.

Assets Affected

The measure applies to assets that do not qualify for full expensing, primarily:

•Assets bought for leasing

•Second-hand assets

•Cars (all types, including electric vehicles)

Business Impact

• Reduced tax relief: Businesses investing in capital equipment will receive less generous tax deductions, increasing the effective cost of investment

• Leased assets: Only leased assets are eligible for the new 40% first-year allowance, which partially offsets the disincentive

• Second-hand assets and cars: These receive no first-year allowance, making the reduction in WDA particularly costly for businesses relying on used equipment or vehicle fleets

• Investment deterrent: Lower tax relief reduces the incentive to invest in capital equipment, potentially dampening business growth and productivity

Specific Concern for Small Businesses

Small businesses often rely on purchasing second-hand equipment and vehicles to manage cash flow. This change will make such investments less tax-efficient.

4. BUSINESS RATES CHANGES

Policy Measures

The budget includes several changes to business rates:

1.Multiplier adjustments: Changes to the multipliers used to uprate business rates annually

• Reduces rates for retail, hospitality, and leisure properties

• Increases rates for high-value properties

2.Transitional relief: A transitional relief package will cap increases following revaluations due in 2026

3.Local retention: Extensions to measures allowing certain local authorities to retain a higher proportion of business rates revenue locally

Fiscal Impact

• Reduces receipts by £1.2 billion on average between 2026-27 and 2028-29

• Broadly neutral by end of the forecast as transitional relief and local retentions expire

Business Implication

• Retail, hospitality, and leisure: These sectors benefit from rate reductions, providing some relief

• Other sectors: High-value properties face increased rates

• Revaluation impact: While transitional relief caps increases following 2026 revaluations, businesses should prepare for potential rate increases when relief expires

• Variability: The impact depends on property value and sector, creating uncertainty for business planning

5. CORPORATION TAX CONTEXT

Current Rate

The corporation tax main rate remains at 25% (increased from 19% in April 2023), with a lower rate of 19% for profits below £50,000.

Capital Allowances Impact

The reduction in writing down allowances (discussed above) effectively increases the corporation tax burden on capital investment by reducing available deductions.

Business Investment Outlook

The OBR notes that business investment is expected to be weaker over the forecast period due to:

• Continued weakness in business sentiment

• Lower profit growth

• Increases in long-term interest rates pushing up the cost of capital

This suggests the investment climate remains challenging for small businesses.

6. PERSONAL TAX THRESHOLDS: FROZEN UNTIL 2028

Policy

Personal income tax thresholds remain frozen, including:

• Personal allowance

• Higher-rate threshold

• Additional-rate threshold

• Secondary threshold for employer NICs

Impact on Owner-Managed Businesses

• Fiscal drag: As inflation erodes real incomes, more business owners and their employees are pushed into higher tax bands

• Cumulative effect: The freeze has been in place since 2022-23 and is now extended, creating significant cumulative tax increases

• Dividend taxation: Changes to dividend tax rates (see below) compound this effect

Business Owner Impact

Owner-managers drawing income as salary and dividends face increased tax burdens through:

1.Frozen personal allowance (reducing the amount of income taxed at the basic rate)

2.Frozen higher-rate threshold (pushing more income into the 40% band)

3.Increased dividend taxation (see below)

7. DIVIDEND AND INVESTMENT INCOME TAX INCREASES

Policy Changes (From April 2026)

Dividend tax rates increase by 2 percentage points:

• Basic rate: 8.75% → 10.75%

• Higher rate: 33.75% → 35.75%

Savings income tax rates increase by 2 percentage points (from April 2027):

• Basic rate: 20% → 22%

• Higher rate: 40% → 42%

• Additional rate: 45% → 47%

Property income tax rates increase by 2 percentage points (from April 2027):

• Basic rate: 20% → 22%

• Higher rate: 40% → 42%

• Additional rate: 45% → 47%

Costing

• Dividend increases: £1.2 billion per year average from 2027-28

• Savings and property income increases: £0.5 billion per year average from 2028-29

Business Owner Impact

Owner-managers who extract profits as dividends will face increased tax bills. This is particularly significant for:

• Limited company owners

• Landlords with property income

• Business owners with investment income

Example: A business owner extracting £50,000 in dividends above the basic rate threshold will pay an additional £1,000 per year in tax (on the £50,000 at the increased 2 percentage point rate).  

8. TAX COMPLIANCE AND SMALL BUSINESS TAX GAP

The Small Business Tax Gap Issue

The latest HMRC data shows that the tax gap attributed to small businesses has increased to 60% of the overall tax gap in 2023-24. This is a significant concern for tax compliance.

Government Response

The budget includes substantial tax administration, compliance, and debt collection measures estimated to raise £2.3 billion by 2029-30.

Specific Focus on Small Businesses

HMRC estimates that the compliance package will target around one-third of the small business tax gap.

Measures Include

• Targeting multinational company transfer pricing

• Fraud detection in the construction industry

• Non-compliant tax advisor identification

• Late filer penalties

• Image rights abuse prevention

• Informant reward schemes

• Enhanced HMRC data access and use

• Increased debt collection through debt collection agencies (DCAs)

• Expanded use of DCAs for older tax debts

Business Implications

• Increased scrutiny: Small businesses should expect enhanced HMRC compliance activity

• Record-keeping: Businesses must maintain robust records and documentation

• Professional advice: Engaging qualified accountants and tax advisors becomes more important

• Debt collection: Overdue tax payments will face more aggressive collection action

• Penalties: Non-compliance will face higher penalties and enforcement action

Risk Assessment

The OBR notes that the projected decrease in the tax gap carries both upside and downside risk. While HMRC has been successful in reducing the tax gap in the past (2013-2017), the tax gap has remained stable since 2017-18 despite previous compliance initiatives.

9. ECONOMIC OUTLOOK AND BUSINESS ENVIRONMENT

Real GDP Growth Forecast

• 2025: 1.5% (revised up from March forecast)

• 2026-2029 average: 1.5% (revised down from 1.8% in March)

• Overall: Slower growth than previously expected

Productivity Concerns

• Medium-term productivity growth forecast reduced from 1.3% to 1.0% per year

• This is a significant downward revision and suggests structural challenges in the UK economy

• Lower productivity growth limits wage growth and business profitability

Business Investment

• Business investment growth is expected to be weaker than previously forecast

• Drivers of weakness:

• Continued weakness in business sentiment

• Lower profit growth

• Higher long-term interest rates increasing the cost of capital

Unemployment

• Expected to rise gradually from current levels of around 5%

• Labour market softening expected over the forecast period

Inflation

• Near-term inflation slightly higher than March forecast

• Policy measures reduce CPI inflation by 0.3 percentage points in 2026

Business Confidence

The OBR notes that business and consumer confidence remains subdued, partly due to the anticipation of further tax rises announced in this budget.

10. SUMMARY OF FINANCIAL IMPACTS

Direct Tax Increases on Businesses (by 2029-30)

Cumulative Effect

The cumulative effect of these measures represents a significant increase in the tax burden on small businesses and owner-managers, particularly those:

• With employees (employer NIC impact)

• Offering pension schemes (salary-sacrifice changes)

• Making capital investments (WDA reduction)

• Operating in retail, hospitality, or leisure (business rates changes)

• Extracting profits as dividends (dividend tax increases)

• Operating in the construction industry or with complex tax arrangements (compliance focus)

11. STRATEGIC CONSIDERATIONS FOR SMALL BUSINESS OWNERS

Immediate Actions (2025-2026)

1.Pension Scheme Review: Evaluate current salary-sacrifice pension arrangements and consider alternatives before April 2029 implementation

2.Capital Investment Planning: Accelerate capital purchases before April 2026 to benefit from current WDA rates (18%)

3.Tax Planning: Review dividend extraction strategies in light of increased dividend tax rates (effective April 2026)

4.Compliance Audit: Ensure tax records and compliance are robust, given increased HMRC scrutiny

5.Employee Communications: Prepare for potential changes to pension arrangements and their impact on employees

Medium-Term Considerations (2026-2029)

1.Cost Management: Review pricing strategies to offset increased tax and employment costs

2.Investment Decisions: Reassess capital investment plans given reduced tax relief and higher cost of capital

3.Staffing Strategy: Consider the impact of increased employer NICs on hiring and wage growth decisions

4.Business Structure: Review whether the current business structure (sole trader, partnership, limited company) remains optimal

5.Professional Advice: Engage qualified accountants and tax advisors to optimise tax position

Longer-Term Considerations (2029-2031)

1.Business Viability: Assess the impact of cumulative tax increases on business profitability and sustainability

2.Growth Strategy: Evaluate whether the business can grow profitably under the new tax regime

3.Exit Planning: Consider whether the business remains attractive as a long-term investment

4.Succession Planning: Review the impact of tax changes on business succession and transfer

12. RISKS AND UNCERTAINTIES

Key Risks to Forecast

1.Productivity Growth: The downward revision to productivity growth is a significant risk. If productivity continues to underperform, growth will be weaker and tax revenues lower than forecast

2.Business Investment: Weaker business investment could further dampen productivity and growth

3.Compliance Measures Yield: The tax gap compliance measures are subject to significant uncertainty. Historical experience suggests that attrition rates can be high as businesses find alternative compliance routes

4.Small Business Responses: The impact of measures on small business behaviour is uncertain. Businesses may respond by:

• Reducing investment

• Reducing employment

• Restructuring operations

• Relocating to lower-tax jurisdictions

5.Interest Rates: Higher long-term interest rates increase the cost of capital for businesses seeking to borrow

6.Geopolitical Uncertainty: The OBR notes that geopolitical uncertainty persists and may continue to weigh on business confidence

13. COMPARISON WITH PREVIOUS FORECASTS

Changes Since March 2025 Forecast

Pre-Measures Forecast Changes:

• Borrowing £17 billion higher in 2025-26

• Borrowing £6 billion higher in 2029-30

• Driven by higher spending (welfare, local authorities, debt interest)

• Partially offset by higher tax receipts from inflation and earnings growth

Policy Changes:

• Budget policies increase spending by £11 billion by 2029-30

• Budget policies raise taxes by £26 billion by 2029-30

• Net impact: Increases borrowing by £5 billion on average over the next three years, then reduces by £13 billion in the following two years

14. FISCAL CONTEXT

Government Fiscal Rules

The Government has set two fiscal rules:

1.Current budget balance: Current budget to be in balance by 2029-30

2.Debt reduction: Public sector net debt as a percentage of GDP to be falling by 2029-30

Forecast Performance

• Current budget: Forecast to be in surplus by £22 billion in 2029-30 (exceeding the balance target)

• Debt: Forecast to rise from 95% of GDP in 2025-26 to peak at 97% in 2028-29, then fall slightly to 96.1% in 2030-31

Implications

The Government is relying heavily on tax increases (around three-quarters of fiscal consolidation) rather than spending cuts to meet its fiscal rules. This tax-heavy approach means that businesses and individuals will bear a significant share of the fiscal consolidation burden.

15. KEY TAKEAWAYS FOR SMALL BUSINESS OWNERS

1.Employer costs are rising: Frozen secondary threshold combined with 15% NIC rate means sustained cost increases for businesses with employees

2.Pension schemes are changing: Salary-sacrifice arrangements will become less tax-efficient from April 2029

3.Capital investment is less attractive: Reduced writing down allowances and higher cost of capital make capital investment less tax-efficient

4.Tax compliance is tightening: HMRC is focusing on small business tax compliance; ensure records are robust

5.Dividend taxation is increasing: Owner-managers extracting profits as dividends face higher tax bills

6.Business environment is challenging: Slower growth, lower productivity, and higher interest rates create a difficult backdrop for business expansion

7.Planning is essential: Small business owners should work with qualified advisors to optimise their tax position and business strategy in light of these changes

CONCLUSION

The November 2025 budget represents a significant tightening of the fiscal environment for UK small businesses. While some measures (such as business rates relief for retail, hospitality, and leisure) provide targeted support, the overall impact is a substantial increase in the tax burden on businesses and business owners.

The combination of higher employer NICs, reduced capital allowances, increased dividend taxation, and enhanced compliance activity creates a challenging environment for business growth and investment. Small business owners should review their tax planning, pension arrangements, capital investment strategies, and compliance procedures in light of these changes.

The forecast also suggests a slower-growing economy with productivity challenges, which will limit opportunities for business expansion and wage growth. Against this backdrop, small business owners should focus on cost management, efficiency improvements, and strategic planning to maintain profitability and competitiveness.

Engagement with qualified accountants and tax advisors is strongly recommended to navigate these changes and optimise business performance under the new tax regime.