As the 2025/2026 tax year progresses, there's no better time to think about year-end tax planning in the United Kingdom. With the tax year ending on 5 April 2026, every month that passes is a missed opportunity to make the most of your allowances, reliefs, and exemptions. Whether you're an employee, self-employed, or drawing income from multiple sources, having a clear strategy can meaningfully reduce your tax bill in the United Kingdom — legally and efficiently.
In this guide, we'll walk you through the most impactful United Kingdom tax tips for 2025/2026, covering everything from personal allowances and pension contributions to ISAs, capital gains, and common mistakes to avoid. Let's make sure you're not paying a penny more than you need to.
Use our United Kingdom Income Tax Calculator at any point to model different scenarios and see exactly how these strategies could affect your tax liability.
Understanding UK Income Tax Rates and Thresholds for 2025/2026
Before diving into tax planning strategies, it's essential to understand the current income tax landscape. For the 2025/2026 tax year (6 April 2025 to 5 April 2026), the key rates and thresholds for England, Wales, and Northern Ireland are:
| Band | Taxable Income | Tax Rate |
|---|---|---|
| Personal Allowance | Up to £12,570 | 0% |
| Basic Rate | £12,571 – £50,270 | 20% |
| Higher Rate | £50,271 – £125,140 | 40% |
| Additional Rate | Over £125,140 | 45% |
Key points to note:
- The Personal Allowance of £12,570 has been frozen since 2021/2022 and remains unchanged for 2025/2026. This freeze, often called a "stealth tax," means that as wages rise with inflation, more of your income is pulled into higher tax bands.
- The Personal Allowance is gradually reduced by £1 for every £2 of adjusted net income above £100,000, disappearing entirely at £125,140.
- Scotland has its own income tax rates and bands, which differ from the rest of the UK. Scottish taxpayers should check the Scottish Government's rates for 2025/2026.
Understanding which band your income falls into is the foundation of effective year-end tax planning. Our United Kingdom Income Tax Calculator can help you determine your exact position.
Maximise Your Pension Contributions
Pension contributions are arguably the single most powerful year-end tax planning tool available to UK residents. They offer immediate tax relief, grow tax-free within the pension wrapper, and can even restore your Personal Allowance if you've lost it.
How Pension Tax Relief Works
When you contribute to a registered pension scheme, you receive tax relief at your marginal rate:
- Basic rate taxpayers (20%): For every £80 you contribute to a personal pension, the government adds £20 automatically (relief at source). A net contribution of £80 becomes £100 in your pension.
- Higher rate taxpayers (40%): You claim an additional 20% relief through your Self Assessment tax return. Effectively, a £100 pension contribution only costs you £60.
- Additional rate taxpayers (45%): The effective cost drops further to just £55 for every £100 contributed.
The Annual Allowance
For 2025/2026, the Annual Allowance is £60,000. This is the maximum amount of tax-relieved pension contributions you can make in a single tax year (including both your contributions and any employer contributions). If you haven't used your full allowance in the previous three tax years, you may be able to carry forward unused amounts — potentially contributing well over £60,000.
Restoring Your Personal Allowance
If your adjusted net income is between £100,000 and £125,140, you face an effective 60% marginal tax rate because your Personal Allowance is being tapered away. Making pension contributions can bring your adjusted net income below £100,000, fully restoring your £12,570 Personal Allowance.
Example: Sarah earns £110,000 in 2025/2026. Her Personal Allowance has been reduced by £5,000 (half of the £10,000 above £100,000). If she makes a £10,000 pension contribution, her adjusted net income drops to £100,000, restoring her full Personal Allowance. The tax saving from this single contribution is approximately £6,000 — that's 60% relief on the contribution.
Action Step
Review your pension contributions for the current year and the previous three years. If you have unused Annual Allowance, consider making additional contributions before 5 April 2026.
Use Your ISA Allowance Before It Expires
The Individual Savings Account (ISA) allowance is a "use it or lose it" benefit. For 2025/2026, you can invest up to £20,000 across all types of ISAs:
- Cash ISA — Interest earned is tax-free
- Stocks and Shares ISA — Capital gains and dividends are tax-free
- Innovative Finance ISA — Returns from peer-to-peer lending are tax-free
- Lifetime ISA — Up to £4,000 per year with a 25% government bonus (subject to conditions, counts towards the £20,000 total)
Why This Matters for Tax Planning
Any income or gains generated within an ISA are completely free from income tax and capital gains tax — forever. Over time, this tax-free compounding can make an enormous difference.
Common mistake: Many people wait until the end of the tax year to use their ISA allowance, risking missing the deadline. Don't let 5 April 2026 pass without sheltering as much as you can.
Couples Should Plan Together
If you're married or in a civil partnership, each partner has their own £20,000 ISA allowance. That's £40,000 per couple that can be invested tax-free each year. Ensuring both partners utilise their full allowance is one of the simplest yet most overlooked UK tax tips for 2025/2026.
Optimise Your Capital Gains Tax Position
The Capital Gains Tax (CGT) Annual Exempt Amount for 2025/2026 is just £3,000 — a dramatic reduction from the £12,300 it was as recently as 2022/2023. This makes careful CGT planning more important than ever.
Key CGT Rates for 2025/2026
- Basic rate taxpayers: 18% on most gains (24% on residential property)
- Higher/additional rate taxpayers: 24% on most gains (24% on residential property)
Note: CGT rates were updated in the Autumn Budget 2024. The lower rate for non-property gains rose from 10% to 18%, and the higher rate from 20% to 24%.
Tax Planning Strategies
Use your annual exempt amount: If you're sitting on investments with unrealised gains, consider selling enough to use your £3,000 exemption before 5 April 2026. You can reinvest the proceeds (though be mindful of the "bed and breakfasting" rules — you cannot sell and repurchase the same shares within 30 days).
Bed and ISA: Sell investments in your general portfolio and immediately repurchase them within your ISA. This crystallises a gain (hopefully within your annual exemption) and shelters future growth from tax.
Transfer assets to your spouse: Transfers between spouses are CGT-free. If one partner has unused exemption or is in a lower tax band, transferring an asset before sale can reduce the CGT liability. Note: New rules introduced from 6 April 2024 require spousal transfers to be used more carefully — the recipient must not sell the asset on the same day to claim an uplift in base cost under certain anti-avoidance provisions.
Offset capital losses: If you have investments that have fallen in value, consider selling them to realise a capital loss. These losses can be set against gains in the same year or carried forward indefinitely.
Claim All Available Tax Reliefs and Allowances
Many UK taxpayers miss out on valuable reliefs simply because they don't know they exist. Here are several to check before the year ends:
Marriage Allowance
If you're married or in a civil partnership and one partner earns less than £12,570 (i.e., doesn't use their full Personal Allowance), they can transfer up to £1,260 of their allowance to the higher-earning partner. This can save up to £252 per year in tax. The higher earner must be a basic rate taxpayer to qualify.
Charitable Giving and Gift Aid
Donations to registered charities under Gift Aid are grossed up by 25%, giving the charity extra money at no extra cost to basic rate taxpayers. Higher and additional rate taxpayers can claim the difference between their marginal rate and the basic rate through Self Assessment.
Example: You donate £1,000 to charity under Gift Aid. The charity claims £250 from HMRC (making the donation worth £1,250). If you're a 40% taxpayer, you can claim an additional £250 in tax relief on your return — meaning the £1,000 donation effectively costs you just £750.
Working From Home Allowance
If your employer requires you to work from home (not by choice), you may be able to claim tax relief on additional household costs. The flat rate for 2025/2026 is £6 per week (£312 per year) without needing to provide receipts, which saves a basic rate taxpayer about £62 per year.
Professional Subscriptions and Expenses
If you pay for professional body memberships or subscriptions that are relevant to your employment (and appear on HMRC's approved list), you can claim tax relief on these costs.
Savings Allowance
Don't forget the Personal Savings Allowance, which lets basic rate taxpayers earn up to £1,000 in savings interest tax-free, and higher rate taxpayers up to £500. Additional rate taxpayers receive no allowance. With interest rates remaining relatively high, more people are exceeding these thresholds — so consider moving excess savings into a Cash ISA.
Dividend Allowance
The Dividend Allowance for 2025/2026 is £500 — down from £1,000 in 2023/2024 and £2,000 in 2022/2023. If you receive dividend income above this level, it's taxed at 8.75% (basic rate), 33.75% (higher rate), or 39.35% (additional rate). Moving dividend-producing investments into an ISA can shelter them from this tax entirely.
Planning for Self-Employed and Higher Earners
If you're self-employed or earn above certain thresholds, year-end planning requires some additional considerations.
Timing of Income and Expenses
Self-employed individuals may have some flexibility in the timing of invoicing or the purchase of business equipment. If you expect to be in a lower tax band next year, it might make sense to defer income. Conversely, if you expect to earn more next year, bringing forward expenses into the current year can reduce this year's taxable profit.
Capital Allowances and the Annual Investment Allowance
The Annual Investment Allowance (AIA) allows businesses to deduct the full cost of qualifying plant and machinery up to £1,000,000 per year. If you're planning a significant business purchase, ensuring it falls within the current tax year can provide immediate tax relief.
High Income Child Benefit Charge
If you or your partner earn between £60,000 and £80,000 and claim Child Benefit, you'll face the High Income Child Benefit Charge (HICBC). The charge is 1% of the Child Benefit received for every £200 of income above £60,000. Above £80,000, the charge equals the full Child Benefit amount.
Making pension contributions to bring your adjusted net income below £60,000 can eliminate this charge entirely — another reason pensions are such a powerful planning tool.
Payments on Account
If you're self-employed and make payments on account, check whether your current year profits are likely to be lower than the previous year. If so, you can apply to reduce your payments on account to avoid overpaying tax and improve your cash flow.
Common Year-End Tax Planning Mistakes to Avoid
Even with the best intentions, taxpayers frequently make errors that cost them money. Here are the most common pitfalls:
Missing the 5 April deadline: ISA allowances, CGT annual exemptions, and pension annual allowances cannot be carried forward to the next year (pensions have a separate carry-forward rule, but unused ISA and CGT allowances are lost forever).
Ignoring the Personal Allowance taper: Not realising that earning between £100,000 and £125,140 creates an effective 60% marginal rate — and not taking steps to mitigate it.
Failing to use both partners' allowances: Each individual has their own set of allowances. Not transferring assets or income between spouses where appropriate is a missed opportunity.
Overlooking carry-forward pension allowances: Many people don't realise they can use up to three years of unused pension Annual Allowance. This can be transformational for those with a lump sum to invest.
Not filing Self Assessment when required: If your income exceeds £150,000 (or you owe the HICBC, or have significant investment income), you may need to file a return to claim reliefs even if all your income is taxed at source.
Waiting until the last minute: Effective tax planning requires time. Rushing decisions in early April often leads to suboptimal outcomes or missed opportunities.
Frequently Asked Questions
When does the 2025/2026 UK tax year end?
The 2025/2026 UK tax year runs from 6 April 2025 to 5 April 2026. All allowances and reliefs must be used within this period.
Can I reduce my tax bill by making pension contributions?
Yes. Pension contributions receive tax relief at your marginal rate (20%, 40%, or 45%), and can also restore lost Personal Allowance if your income is between £100,000 and £125,140.
What happens to my unused ISA allowance?
It is lost. The £20,000 ISA allowance does not roll over from one tax year to the next. You must use it before 5 April 2026.
Do I need to file a Self Assessment tax return?
You generally need to file if you're self-employed, earn over £150,000, have significant untaxed income, or need to claim certain reliefs. HMRC provides a tool to check whether you need to file.
How can I check how much tax I'll owe?
Use our United Kingdom Income Tax Calculator to estimate your income tax liability for 2025/2026 based on your specific circumstances.
Conclusion: Take Action Before 5 April 2026
Year-end tax planning isn't about aggressive schemes or bending the rules — it's about making full use of the allowances and reliefs that Parliament has put in place for everyone. Here are your key takeaways:
- Maximise pension contributions to benefit from tax relief, carry forward unused allowances, and potentially restore your Personal Allowance.
- Use your £20,000 ISA allowance to shelter future income and gains from tax permanently.
- Utilise the £3,000 CGT annual exemption before it resets on 6 April.
- Claim all available reliefs including Marriage Allowance, Gift Aid, and working-from-home allowance.
- Plan as a couple to take advantage of both partners' allowances and tax bands.
- Don't wait — the sooner you review your position, the more options you have.
To get a clear picture of where you stand, try our United Kingdom Income Tax Calculator and model different scenarios for the 2025/2026 tax year.
This article is for informational purposes only and does not constitute tax advice. Tax laws change frequently; consult a qualified tax professional for advice specific to your situation.