10 Legal Ways to Reduce Your UK Tax Bill in 2026/27

Why tax planning matters more in 2026/27

The personal allowance has been frozen at £12,570 since 2021 and will stay frozen until at least April 2028. Combined with wages rising faster than inflation, this fiscal drag pulls millions of workers into higher tax bands without any change to the headline rates. In 2026/27, the higher-rate threshold remains at £50,270 — the same as it was in 2021/22.

The good news: HMRC provides a wide range of perfectly legal reliefs and wrappers. Using them consistently is not aggressive tax avoidance — it is exactly what Parliament intended when it created the ISA, pension relief, and allowance rules. Here are the ten most impactful strategies for most UK taxpayers in 2026/27.

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1. Salary sacrifice into a pension

Salary sacrifice is the single most tax-efficient benefit available to most employees. You agree with your employer to reduce your gross salary, with the difference going directly into your workplace pension. Because your gross pay falls:

• You pay less income tax (20%, 40%, or 45% depending on your band).
• You pay less employee National Insurance (8% up to £50,270; 2% above).
• Your employer pays less employer NI (15% above £5,000/year) — many employers pass this saving back as a higher employer contribution.

Worked example — basic-rate taxpayer contributing £200/month:

That is £56 of extra pension funding generated from the same £200 net outlay — a 39% uplift if the employer passes the NI saving back.

For higher-rate taxpayers the saving is even greater: the same £200 sacrifice costs only £116 net (42% saving). At the extreme, additional-rate taxpayers earning above £125,140 save 47% (45% IT + 2% NI).

2026/27 pension annual allowance: £60,000 (or 100% of earnings if lower). You can carry forward unused allowance from the three previous tax years.

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2. Maximise your ISA allowance

The Individual Savings Account (ISA) is the UK's most flexible tax wrapper. The annual allowance is £20,000 for 2026/27. Once inside an ISA:

• All investment growth is free from Capital Gains Tax.
• All income (interest and dividends) is free from Income Tax.
• Withdrawals at any time, for any reason, with no tax consequences.
• The shelter is permanent — there is no annual fee or time limit.

Types of ISA available:

The LISA deserves a special mention: up to £4,000 per year attracts a 25% government bonus (max £1,000/year) — effectively an instant 25% return before any investment growth. It counts within the £20,000 ISA limit.

Strategy: If you have a general investment account with unrealised gains, consider a bed-and-ISA (see strategy 10) to move assets inside the wrapper before they grow further.

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3. Reclaim higher-rate Gift Aid relief

When you donate to a UK registered charity under Gift Aid, the charity reclaims 25p of basic-rate tax per £1 donated (i.e., your £80 donation is worth £100 to the charity). You get nothing extra at this stage if you're a basic-rate taxpayer.

But if you pay 40% or 45% tax, you can reclaim the difference between your rate and the basic rate through Self Assessment:

• 40% taxpayer: reclaim 20% of the gross donation — worth 25p per £1 you actually paid.
• 45% taxpayer: reclaim 25% — worth 31p per £1 you paid.

Example: You donate £800 cash. Gross donation = £1,000. As a 40% taxpayer, your Self Assessment reclaim = £200. Your effective net cost of a £1,000 charitable donation = £600.

Gift Aid also extends your basic-rate band by the gross donation amount, meaning more of your income is taxed at 20% rather than 40%. This is especially useful for anyone earning just over £50,270.

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4. Claim the Marriage Allowance (worth up to £252/year)

The Marriage Allowance lets a spouse or civil partner who earns below the personal allowance (£12,570) transfer £1,260 of their unused allowance to their partner. The receiving partner's tax bill falls by £252 (20% × £1,260).

Conditions:

• One partner must earn £12,570 or less.
• The other must be a basic-rate taxpayer (income between £12,570 and £50,270). Higher-rate taxpayers do not qualify.
• You must be married or in a civil partnership (cohabiting couples cannot claim).

The allowance can be backdated up to four prior tax years: 2022/23, 2023/24, 2024/25, 2025/26 — on top of 2026/27. A claim covering all five years could produce a one-off lump sum of up to £1,260.

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5. Electric vehicle company car (4% BIK rate)

If your employer offers a company car scheme, choosing a fully electric vehicle (EV) in 2026/27 means the Benefit in Kind (BIK) rate is only 4% (rising to 5% in 2027/28 and 7% in 2028/29 — still very low by historical standards).

Compare to petrol cars at 120 g/km CO2: 30% BIK rate.

Example: £40,000 list price EV at 4% = £1,600 taxable benefit. A 40% taxpayer pays £640/year in extra income tax. A petrol car of the same value at 30% = £12,000 taxable benefit → £4,800/year income tax.

The annual saving by choosing the EV: £4,160 for a 40% taxpayer. If the company also covers charging, the fuel benefit for EVs is zero (only applicable to combustion cars).

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6. Use the £1,000 trading allowance

If you earn money on the side — selling on eBay, driving for a delivery platform, casual freelance work — the £1,000 trading allowance means the first £1,000 of gross income is entirely tax-free with no need to register for Self Assessment or keep expense records.

Above £1,000, you register for Self Assessment and can either:

• Deduct the flat £1,000 allowance instead of actual expenses (simpler), or
• Deduct actual allowable expenses (better if expenses exceed £1,000).

The trading allowance is separate from the £1,000 property allowance for rental income — you can claim both in the same year if you have both types of income.

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7. Use the £500 dividend allowance carefully

The dividend allowance fell to £500 for 2026/27 (from £2,000 in 2022/23). Every pound above £500 of dividend income is taxed at:

• 8.75% (basic rate)
• 33.75% (higher rate)
• 39.35% (additional rate)

If you are a shareholder-director, structuring your remuneration with a mix of salary up to the secondary threshold (£5,000 employer NI threshold) and dividends up to the basic-rate band is a common and legal strategy — but always take professional advice on the specific numbers given recent changes to employer NI.

Moving dividend-paying investments inside an ISA eliminates dividend tax entirely and is almost always worth doing if you have remaining ISA allowance.

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8. Crystallise gains within the CGT annual exempt amount

The CGT annual exempt amount is £3,000 for 2026/27 — down sharply from £12,300 in 2022/23. Despite the reduction, every year you do not use it is wasted: it cannot be carried forward.

Strategy: Each April, review your general investment account. If you have unrealised gains, consider selling enough to crystallise up to £3,000 of gains tax-free, then repurchasing (after 30 days to avoid the bed-and-breakfast rule, or using an ISA immediately to avoid the wait — see bed-and-ISA below).

For married couples, each spouse has their own £3,000 AEA — consider shifting assets between spouses (which is a no-gain/no-loss transfer) to double the annual exemption used.

CGT rates on non-property assets: 18% (basic rate) / 24% (higher rate). On residential property: 18% / 24% (post-October 2024 Budget).

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9. Pension carry-forward — catch up on missed years

If you have not used your full pension annual allowance in any of the three prior tax years, you can carry it forward to 2026/27:

In theory you could contribute up to £205,000 in a single year (subject to having sufficient UK earnings in 2026/27 and being a member of a registered pension scheme for each year you carry from).

This is particularly powerful for business owners or those who received a large bonus or sold a business asset in 2026/27 — the pension contribution directly reduces taxable income.

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10. Bed-and-ISA: shelter existing investments for the future

A bed-and-ISA is the process of selling investments held in a taxable general investment account (GIA) and immediately repurchasing the same assets inside an ISA. Unlike the 30-day bed-and-breakfast rule (which would trigger the original cost base if you repurchased outside an ISA), moving into an ISA wrapper is specifically permitted by HMRC.

Why do it?

• All future growth and dividends are permanently sheltered from CGT and Income Tax.
• If you have a large GIA, each year you can move up to £20,000 of investments into the ISA wrapper.
• You will crystallise any existing gain at the point of sale — so check whether you have capacity within your £3,000 AEA before selling.

Example: You hold £25,000 of shares with a £4,000 unrealised gain. You sell in April, crystallise £4,000 gain (£1,000 above AEA — you owe CGT on £1,000 at your marginal rate). You then invest £20,000 back into the same shares inside your ISA. Future gains on the £20,000 are tax-free for life.

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Putting it all together

No single strategy works in isolation. The most impactful combination for a higher-rate employee in 2026/27:

1. Maximise salary sacrifice pension contributions to bring taxable income below £50,270.
2. Fill the ISA — shift dividend-paying assets in first.
3. Claim Marriage Allowance if one spouse earns below £12,570.
4. Reclaim Gift Aid through Self Assessment.
5. Crystallise £3,000 CGT gains each April via bed-and-ISA.

Used together, these strategies can save a higher-rate employee several thousand pounds per year without any complex tax structures or professional schemes.

Sources

• HMRC: Income Tax rates and Personal Allowances
• HMRC: Individual Savings Accounts (ISAs)
• HMRC: Tax relief on pension contributions
• HMRC: Marriage Allowance
• HMRC: Capital Gains Tax rates and allowances
• HMRC: Gift Aid