• Taxation
• ||
• February 11, 2026

Stay Ahead of the 2025/26 Tax Year with Proactive Financial Planning

February may appear to be a quieter month in the financial calendar, but it is actually one of the most important times to review your tax position, optimise reliefs, and prepare for the end of the tax year on 5 April 2026.

From Self Assessment penalties and ISA allowances to pension tax relief and Companies House fee increases, this February 2026 tax update outlines the key developments affecting UK individuals, landlords, directors, and business owners.

Self Assessment 2026: Missed the 31 January Deadline?

HMRC confirmed that over 11.48 million taxpayers submitted their 2024/25 Self Assessment tax returns by 31 January 2026. However, approximately 1 million individuals missed the deadline.

If you have not yet filed, the penalties escalate quickly:

• £100 fixed penalty immediately
  
• £10 per day after 3 months (up to £900)
  
• £300 or 5% of tax due at 6 months
  
• A further £300 or 5% at 12 months
  
• Late payment surcharges of 5% at 30 days, 6 months and 12 months
  
• Interest charged on unpaid tax
  

Can HMRC Waive Penalties?

HMRC may cancel penalties if you can demonstrate a reasonable excuse. If you have missed the deadline, it is critical to act quickly. Late filing, appeals, and Time to Pay arrangements can still be managed efficiently with professional support.

2025/26 Year-End Tax Planning: Maximise Reliefs Before 5 April 2026

With the tax year end approaching, now is the time to optimise your allowances and reduce unnecessary tax exposure.

1. ISA Allowance – Use It or Lose It

For the 2025/26 tax year:

• You can invest up to £20,000 per person in ISAs.
  
• Individuals aged 18–39 can contribute up to £4,000 into a Lifetime ISA, receiving a 25% government bonus (up to £1,000 annually).
  
• Lifetime ISA contributions count towards the overall £20,000 ISA limit.
  

Failing to use your ISA allowance before 5 April means losing it permanently.

2. Pension Contributions – Strategic Tax Savings

Pension planning remains one of the most tax-efficient strategies available:

• A £4,000 contribution from a basic rate taxpayer becomes £5,000 in the pension after tax relief.
  
• Higher rate taxpayers can claim additional relief via their tax return.
  
• Individuals earning between £100,000 and £125,140 can use pension contributions to reduce adjusted net income, potentially achieving up to 60% effective tax relief.
  

Timing and annual allowance limits are critical, so early planning is essential.

Voluntary National Insurance Contributions (NICs)

To qualify for the full UK State Pension, you typically need 35 qualifying years of National Insurance Contributions.

If you have gaps:

• Class 3 voluntary NICs cost £17.75 per week for 2025/26
  
• The rate rises to £18.40 per week in 2026/27
  
• Usually, you can backpay for the previous six tax years
  
• Gaps for 2019/20 must generally be filled by 5 April 2026
  

Even a small number of voluntary contributions can significantly improve long-term pension entitlement.

Working From Home Tax Relief Ending in April 2026

From 6 April 2026, employees will no longer be able to claim tax relief for working from home.

For 2025/26:

• Relief of £6 per week (or actual costs if higher) remains available
  
• Only applies if your employment contract requires homeworking
  

Estimated impact:

• Basic rate taxpayers: approximately £62 increase in tax
  
• Higher rate taxpayers: approximately £124 increase
  

From 2026/27, employer reimbursements will remain tax-free if contractually required.

Employees should review their arrangements before the new tax year begins.

Companies House and HMRC Filing Changes

Companies House Fee Increase

From 1 February 2026, the digital confirmation statement fee has increased:

• £34 → £50
  

Directors should budget accordingly and ensure timely filings.

HMRC Closing Free Online Filing Service

By 31 March 2026, HMRC will close its free joint online filing system for:

• Company accounts
  
• Corporation Tax (CT600)
  

After this date, directors must use approved commercial software to submit filings.

This change increases the importance of structured digital accounting systems and professional compliance support.

A Brief History of UK Tax

The UK tax system dates back more than 300 years. Income tax was first introduced in 1799 by William Pitt the Younger to fund the Napoleonic Wars.

The initial rate?
Two old pence per pound on income over £60.

While tax legislation has evolved significantly, one principle remains constant: taxpayers should pay no more than legally required.

Preparing for the 2026/27 Tax Year

February is the ideal time to:

• Review your Self Assessment position
  
• Maximise ISA and pension allowances
  
• Assess National Insurance gaps
  
• Prepare for Companies House and HMRC filing changes
  
• Plan salary and dividend strategies (for company directors)
  

Whether you operate a limited company, work as a sole trader, invest in property, or earn employment income, proactive planning before 5 April 2026 can materially reduce your tax liability and strengthen your financial position.

Final Thoughts

As we approach the new tax year, strategic planning—not reactive compliance—will define financial success in 2026.

At Adept Accountax, we provide practical, structured, and forward-looking tax advice to help individuals and businesses remain compliant while optimising their tax position.

If you would like tailored guidance on any of the matters discussed in this update, please contact our team for professional support.