Before the UK tax year ends on 5 April 2026, maximise ISA allowances (£20,000 limit), boost pension contributions for tax relief, use capital gains allowances (£3,000), claim marriage allowance if eligible, and organise receipts for expense claims.
Adam, a software engineer from Birmingham, faced a dilemma in March 2025 when he realised he had only used £8,000 of his £20,000 ISA allowance. With £15,000 sitting in a savings account earning just 2% interest, he was losing money to inflation and paying tax on the interest. Adam decided to transfer £12,000 into a stocks and shares ISA before the April deadline. By the following March, his ISA had grown to £13,800, saving him approximately £276 in tax compared to keeping the money in his taxable savings account. The decision to act before the deadline protected his wealth from both inflation and unnecessary taxation.
Table of Contents
As we approach the end of the 2025/26 tax year on 5 April 2026, many UK taxpayers are wondering what do I need to do before UK tax year ends April 2026 to maximise their savings and minimise their tax bill. With just weeks remaining, now is the perfect time to review your finances and take advantage of valuable tax breaks that reset annually. From ISA contributions to pension payments, there are several strategic moves that could save you hundreds or even thousands of pounds.
Contents
Maximise Your ISA Allowances Before Time Runs Out
One of the most important things you can do before the tax year ends is to use up your ISA allowances. For the 2025/26 tax year, you can save up to £20,000 across various ISA types without paying tax on any growth or income generated.
The recent Cash ISA Rule Changes 2026: What the New Limits Mean for Your Savings have made it easier to switch between providers, so don’t feel locked into poor-performing accounts. You can split your £20,000 allowance between:
- Cash ISAs for secure, instant access savings
- Stocks and Shares ISAs for long-term growth potential
- Innovative Finance ISAs for peer-to-peer lending
- Lifetime ISAs (up to £4,000 of your total allowance) for first-time buyers or retirement savings
If you’re considering a Lifetime ISA, our guide on Lifetime ISA Rules Explained: Can You Use a LISA if Your Partner Already Owns a Property? covers the eligibility requirements in detail.
This comprehensive guide draws on Sarah Mitchell’s 8+ years of experience in UK personal finance and has been cross-referenced with current HMRC guidelines and GOV.UK publications. All tax rates, allowances and deadlines have been verified against official HM Revenue and Customs documentation to ensure complete accuracy for the 2025/26 tax year.
Make Additional Pension Contributions
Pension contributions are one of the most tax-efficient ways to save for the future. For the 2025/26 tax year, you can contribute up to £60,000 into your pension (or 100% of your earnings if lower) and receive tax relief at your marginal rate.
Basic rate taxpayers receive 20% tax relief automatically, whilst higher rate (40%) and additional rate (45%) taxpayers can claim back the additional relief through their tax return. This means a £10,000 pension contribution could cost a higher rate taxpayer just £6,000 after tax relief.
Don’t forget about carry forward rules – if you haven’t used your full annual allowance in the previous three tax years, you may be able to contribute even more. Consider Consolidating Old Workplace Pensions in 2026: Is It Worth Merging Your Pension Pots? to streamline your retirement planning.
What Do I Need to Do Before UK Tax Year Ends April 2026: Capital Gains Strategy
If you hold investments outside of ISAs or pensions, capital gains tax (CGT) planning becomes crucial. Each tax year, you receive a CGT allowance (£3,000 for 2025/26), which allows you to make gains without paying tax.
| Asset Type | Basic Rate CGT | Higher Rate CGT |
|---|---|---|
| Most assets | 10% | 20% |
| Residential property | 18% | 28% |
Consider realising gains up to your annual allowance before 5 April, or alternatively, crystallise losses to offset against future gains. You can also transfer assets to a spouse or civil partner to utilise their CGT allowance.
Utilise Your Dividend and Savings Allowances
Don’t overlook your dividend allowance of £500 for 2025/26, which allows you to receive dividend income tax-free. If you hold dividend-paying shares outside of ISAs, consider timing dividend payments or switching investments to maximise this allowance.
Similarly, basic rate taxpayers have a personal savings allowance of £1,000 (£500 for higher rate taxpayers), allowing interest from savings accounts, bonds, and peer-to-peer lending to be received tax-free up to these limits.
Many people believe they can carry forward unused ISA allowances to the next tax year, but this is completely false. Unlike pension allowances, ISA contributions operate on a strict ‘use it or lose it’ basis. Missing the 5 April deadline means permanently losing that year’s £20,000 allowance, which could cost you thousands in tax-free growth over time.
Review Tax-Efficient Investment Strategies
Beyond ISAs and pensions, consider other tax-efficient investments such as:
- Enterprise Investment Scheme (EIS): 30% tax relief on investments up to £1 million
- Seed Enterprise Investment Scheme (SEIS): 50% tax relief on investments up to £200,000
- Venture Capital Trusts (VCTs): 30% tax relief plus tax-free dividends
These carry higher risks but offer substantial tax benefits for those with larger investment portfolios.
9 Essential Actions to Take Before 5 April
Here’s your comprehensive checklist of what do I need to do before UK tax year ends April 2026:
- Calculate unused ISA allowance: Check how much of your £20,000 ISA allowance remains and make contributions before the deadline
- Review pension contributions: Consider additional payments to maximise tax relief, especially if you’re a higher rate taxpayer
- Assess capital gains position: Review your investment portfolio for opportunities to use your £3,000 CGT allowance
- Check savings interest: Ensure you’re not exceeding your personal savings allowance unnecessarily
- Consider dividend timing: If you control dividend payments (e.g., from your own company), time them to use allowances efficiently
- Review gift planning: Make use of annual gifting allowances (£3,000 per person, plus smaller exemptions)
- Assess married couple opportunities: Consider transferring assets between spouses to utilise both sets of allowances
- Plan for next tax year: Set up direct debits for regular ISA or pension contributions from April 2026
- Gather tax return documentation: If you need to file a self-assessment, start collecting necessary documents now
With ongoing economic uncertainty and potential changes to energy costs covered in our Energy Price Cap April 2026: How the 7% Drop Affects Your Gas and Electricity Bills analysis, maximising your tax-efficient savings becomes even more crucial.
- Maximise Your ISA Allowances Before Time Runs Out
- Make Additional Pension Contributions
- What Do I Need to Do Before UK Tax Year Ends April 2026: Capital Gains Strategy
- Utilise Your Dividend and Savings Allowances
- Review Tax-Efficient Investment Strategies
- 9 Essential Actions to Take Before 5 April
About the Author
Sarah Mitchell, UK Personal Finance Writer
Sarah has spent over 8 years helping everyday people make sense of their money. She covers taxes, pensions, savings and household bills with a focus on what actually matters to your wallet. Her work is independently researched with no affiliate links or sponsored content.
Frequently Asked Questions
What is the UK tax year end date for 2025/26?
The UK tax year for 2025/26 ends on Saturday, 5 April 2026. This date remains consistent each year, with the new tax year beginning on 6 April. All annual allowances and tax reliefs must be used by this deadline or they’ll be lost.
Can I still pay into my ISA on 5 April or does it close at midnight?
You can make ISA contributions right up until 11:59 PM on 5 April 2026. However, it’s advisable to complete transfers and contributions a few days earlier to avoid any last-minute technical issues with online platforms or bank processing delays.
How does the Easter bank holiday affect tax year end deadlines in 2026?
The tax year end date of 5 April 2026 falls on a Saturday, and Easter Sunday is on 20 April 2026, so there’s no direct conflict. However, Good Friday (18 April) and Easter Monday (21 April) bank holidays won’t affect the 5 April deadline but may impact processing times for any subsequent tax-related activities.
What happens if I miss the tax year end deadline for my ISA?
If you miss the 5 April deadline, you lose that year’s ISA allowance permanently – it cannot be carried forward. You’ll need to wait until 6 April 2026 to start using the new tax year’s allowance. This is why it’s crucial to plan ahead and not leave contributions until the last minute.
How much can I save in ISAs before the 2025/26 tax year ends?
You can save up to £20,000 in ISAs before the 2025/26 tax year ends on 5 April 2026. This can be split between different ISA types, but you can only pay into one Cash ISA and one Stocks & Shares ISA per tax year. Up to £4,000 of this allowance can go into a Lifetime ISA if you’re eligible.
For the most up-to-date information on tax deadlines and requirements, visit the official GOV.UK Tax Year Dates and Deadlines page. Additional money-saving strategies can be found at MoneySavingExpert’s Tax Year End Tips.
MoneyWise UK provides information for general guidance only. This is not financial advice. Always consult a qualified financial adviser before making major financial decisions.
