How to reduce capital gains tax on shares in the UK

The good news is that legitimate ways exist to reduce capital gains tax on shares. This guide walks through 10 practical strategies that may help you keep more of your investment returns. None involve aggressive schemes or legal grey areas. All require planning, record-keeping, and in many cases, professional advice tailored to your circumstances.

Important: this article provides general educational content, not personal tax or financial advice. Tax rules change frequently. Always verify current rates on the gov.uk website and consider consulting a qualified tax adviser.

What is capital gains tax on shares?

Capital gains tax (CGT) applies when you sell, gift, or otherwise dispose of assets that have increased in value. For shares, your gain is calculated as the difference between what you paid for them and what you received when you sold them, minus certain allowable costs.

Not every share sale triggers a tax bill. You only pay CGT on gains that exceed your annual tax-free allowance. You also pay nothing when selling shares held within tax-efficient wrappers like ISAs or pensions, regardless of the profit involved.

Understanding how the UK capital gains allowance and tax rates work forms the foundation for any reduction strategy.

Current CGT rates for share disposals (2026/27)

Capital gains tax rates for shares differ from those applied to property. For the 2026/27 tax year, the rates for share disposals are:

Your rate depends on your total taxable income plus any capital gains. If adding your gains to your income pushes you above the basic rate threshold, you pay 18% on the portion within the basic rate band and 24% on the remainder.

These rates apply specifically to shares and other assets. Residential property attracts higher rates of 18% and 24% respectively. The distinction matters when prioritising which assets to sell first.

The annual CGT allowance explained

The capital gains personal allowance is the amount you can gain each tax year before any CGT becomes payable. For 2026/27, this allowance stands at £3,000 per person.

This figure represents a significant reduction from previous years. The allowance was £12,300 as recently as 2022/23, dropped to £6,000 in 2023/24, and then halved again to £3,000. This shrinkage makes tax planning more important than ever for active investors.

Key points about the annual allowance:

• It applies per person, per tax year

• It cannot be carried forward if unused

• It applies to total gains across all asset classes, not just shares

• Married couples and civil partners each receive their own allowance

10 strategies to potentially reduce your CGT bill

The following approaches are well-established, legitimate methods that UK investors commonly use to manage their capital gains tax liability. Their effectiveness depends on your individual circumstances, and not all approaches will apply to every investor.

1. Use your annual CGT allowance each tax year

The simplest approach involves ensuring you use your £3,000 allowance each tax year before it expires. If you hold shares with substantial unrealised gains, selling a portion each year to realise gains up to the threshold means paying zero tax on those profits.

This strategy requires patience. Rather than selling an entire holding at once and triggering a large taxable gain, you spread sales across multiple tax years. Each year, you would effectively bank £3,000 of tax-free gains.

Consider this example: you hold shares with a £15,000 unrealised gain. Selling everything in one tax year means paying CGT on £12,000 (after your £3,000 allowance). Spreading sales across five tax years could mean paying nothing, assuming gains stay within the allowance each year.

The approach works best when you don’t need immediate access to all funds and can accept the investment risk of holding shares across multiple years.

2. Transfer assets to a spouse or civil partner

Transfers between married couples and civil partners are treated as occurring at no gain and no loss for CGT purposes. This means you can move shares to your spouse without triggering any immediate tax liability.

Why does this help? Each spouse has their own £3,000 annual allowance. A couple can therefore realise up to £6,000 in gains tax-free each year. Additionally, if one spouse pays tax at a lower rate, having them sell the shares results in a lower CGT bill.

Example: You’re a higher rate taxpayer with shares showing a £20,000 gain. Your spouse has no other income. Transferring the shares to your spouse before selling could mean paying 10% CGT instead of 20%, potentially halving the tax bill.

Important considerations:

• The transfer must be a genuine, outright gift

• Your spouse becomes the legal owner with full control

• This strategy only works for married couples or civil partners, not cohabiting partners

• Artificial arrangements designed solely to avoid tax may attract HMRC scrutiny

3. Invest through an ISA (Bed and ISA)

Individual Savings Accounts shield investments from both CGT and income tax. Any gains realised within an ISA are completely tax-free, regardless of size.

The Bed and ISA strategy involves selling shares held outside an ISA, then using your annual ISA allowance (£20,000 for 2026/27) to repurchase the same shares within an ISA wrapper. You pay CGT on any gain from the initial sale, but future growth becomes entirely tax-free.

This approach makes most sense when:

• You have not used your annual ISA allowance

• The shares have relatively modest unrealised gains currently

• You expect significant future growth

The short-term cost is crystallising a gain today. The long-term benefit is eliminating all future tax on that investment. Think of it as paying a smaller tax bill now to avoid a potentially larger one later.

Note that between selling and repurchasing, you’re exposed to market movements. The share price might rise before you can buy back within the ISA.

4. Use a pension (Bed and SIPP)

The Bed and SIPP strategy works similarly to Bed and ISA but uses a Self-Invested Personal Pension instead. You sell shares, realise any gain, and reinvest within your SIPP.

The advantages here are twofold:

• Future growth within the pension is tax-free

• Pension contributions receive tax relief, effectively boosting your investment

If you pay £10,000 net into a relief-at-source pension, it’s typically grossed up to £12,500 (basic-rate relief), subject to allowances. Higher rate taxpayers can claim additional relief through their tax return.

The significant trade-off is access. Pension funds can’t be touched until you reach 55 (rising to 57 from 2028). This strategy might be suitable for long-term investors who don’t need access to the capital in the short- or medium-term.

Annual and lifetime limits on pension contributions also apply, so it’s important to check your available allowances before proceeding.

5. Offset capital losses against gains

Capital losses can be set against capital gains to reduce your taxable amount. If you sell shares at a loss, that loss can offset gains made elsewhere.

Key rules for using losses:

• Current year losses must be offset against current year gains in full, even if this wastes your annual allowance

• Unused losses can be carried forward indefinitely

• Losses carried forward only need to be used to reduce gains below the annual allowance, not to eliminate them entirely

• Losses must be reported to HMRC within four years to be available for future use

This creates an interesting planning opportunity. If you hold both winning and losing positions, timing your sales strategically lets you match gains with losses in the same tax year.

Be aware of the rules around "bed and breakfasting." You cannot sell shares at a loss and immediately repurchase identical shares. If you buy the same shares within 30 days, the loss is not recognised for CGT purposes. The shares sold are matched against the shares bought, not your original holding.

6. Time your disposals across tax years

The tax year runs from 6 April to 5 April the following year. Sales made on 5 April fall into a different tax year than sales made on 6 April.

By timing disposals around the tax year boundary, you can potentially use two years' worth of annual allowances in quick succession. Selling some shares in late March and more in early April (after 5 April) spreads gains across two tax years.

This strategy pairs well with others. For instance, each spouse could realise gains up to their allowance in both tax years, giving a couple access to £12,000 of tax-free gains across two months.

Timing considerations:

• Share prices fluctuate, so waiting could mean selling at a lower price

• Tax rules might change between years

• For CGT, the disposal date is usually the trade/contract date (not the settlement date), but check HMRC guidance for your specific transaction. Ensure your sale settles in your intended tax year

7. Deduct allowable costs

Your taxable gain is not simply the difference between purchase and sale prices. HMRC allows you to deduct certain costs incurred in buying, holding, and selling the asset.

Allowable costs include:

• Original purchase price and any costs of acquisition (broker fees, stamp duty)

• Costs of selling (broker fees, dealing charges)

• Costs of enhancing the asset, if applicable

• Professional fees for valuation or establishing ownership

For shares, the most common deductions are dealing charges and stamp duty paid on purchase. These amounts may seem small individually, but across multiple transactions they accumulate.

Keep detailed records of all transactions, including contract notes and fee statements. You’re not able to deduct costs that you can’t prove.

8. Consider charitable donations of shares

Donating shares directly to charity attracts favourable tax treatment. If you give shares to a registered charity, no CGT applies on the transfer. Additionally, you can claim income tax relief on the market value of the donated shares.

This approach makes sense if:

• You intended to make charitable donations anyway

• You hold shares with large, unrealised gains

• You would otherwise face a significant CGT bill

Compare these two approaches for donating £10,000 to charity:

1. Sell shares, pay CGT on the gain, donate the cash

2. Donate the shares directly, avoid CGT entirely, claim income tax relief

The second route often proves more tax-efficient, though the charity must be willing to accept shares and handle the sale themselves.

9. Enterprise investment scheme (EIS) and other reliefs

Certain government-backed schemes offer CGT advantages to encourage investment in smaller companies.

Enterprise investment scheme (EIS):

• Invest in qualifying companies and defer CGT from gains made elsewhere

• Hold shares for at least three years to maintain relief

• If shares become worthless, loss relief is available

• Income tax relief of 30% on investment also available

Seed enterprise investment scheme (SEIS):

• Similar to EIS but for smaller, newer companies

• 50% income tax relief and CGT exemption on gains reinvested

Venture capital trusts (VCTs):

• Pooled investments in smaller companies

• Dividends tax-free, no CGT on disposal of VCT shares

These schemes involve investing in higher-risk early-stage companies. The tax benefits exist precisely because the underlying investments carry substantial risk. The schemes shouldn’t be pursued these purely for tax reasons, or without understanding and accepting the investment risk involved.

10. Plan for inheritance (CGT and estate planning)

Assets passed on death receive what is called a "tax-free uplift" for CGT purposes. The recipient inherits the assets at their market value on the date of death, with no CGT payable on gains accrued during the deceased's lifetime.

This means that shares with large, unrealised gains might be better held until death rather than sold during your lifetime. The gain effectively disappears for CGT purposes, though the assets may then be subject to inheritance tax (IHT) depending on estate value.

This is an area where tax and estate planning intersect significantly. The right approach depends on:

• Your estate's value relative to IHT thresholds

• Your need for the funds during your lifetime

• The balance between CGT rates and potential IHT liability

• Your broader wishes for asset distribution

Professional advice becomes particularly valuable here, as the interaction between CGT and IHT is complex.

Common mistakes to avoid

Even well-intentioned tax planning can go wrong. Watch for these common errors:

• Forgetting the 30-day rule: Selling shares at a loss and repurchasing the same shares within 30 days invalidates the loss for CGT purposes. If you want to remain invested, consider buying a similar but not identical investment, or waiting the full 30 days.

• Missing reporting deadlines: Capital gains must be reported to HMRC, even when no tax is due because losses offset gains. Failure to report losses within four years means losing the ability to use them later.

• Ignoring transaction costs in calculations: Allowable costs reduce your gain. Keep records of every fee paid.

• Assuming tax rules remain constant: The annual allowance has changed dramatically in recent years. Any planning based on current rules should acknowledge that future changes may alter the picture.

• Over-engineering schemes: Artificial arrangements designed primarily to avoid tax may be challenged by HMRC under general anti-avoidance rules. Stick to legitimate, well-established strategies.

• Forgetting about bed and breakfasting with similar shares: The 30-day rule applies not just to identical shares but also to shares in the same company acquired through different channels.

When to seek professional tax advice

While this guide covers general strategies, professional advice would be sensible in certain situations, such as when:

• You have substantial gains that significantly exceed your annual allowance

• Your tax affairs are complex, involving multiple asset types or income sources

• You’re considering EIS, SEIS, or VCT investments

• You want to coordinate CGT planning with inheritance tax planning

• You have shares acquired through employer share schemes, which have their own complex rules

• You’re unsure whether a particular strategy applies to your circumstances

A qualified tax adviser or chartered accountant can assess your specific situation, identify opportunities you might miss, and help you avoid costly mistakes. Their fees often prove worthwhile when significant sums are at stake.

HMRC also provides guidance at gov.uk, though this explains rules rather than suggesting strategies.

Summary: Key points for UK share investors

Reducing your capital gains tax on shares requires planning, patience, and attention to rules that frequently change. The strategies covered in this guide offer legitimate approaches to managing your tax liability:

• Use your £3,000 annual allowance every year before it expires

• Consider spousal transfers to utilise both allowances and potentially lower rates

• Move investments into ISAs and pensions for tax-free future growth

• Offset losses against gains, keeping records and reporting to HMRC

• Time sales strategically around tax year boundaries

• Deduct all allowable costs from your calculations

• Donate appreciated shares directly to charity if making charitable gifts

• Explore EIS and other reliefs if you accept higher-risk investments

• Factor inheritance planning into your long-term approach

No single strategy suits everyone. The right combination depends on your income, investment portfolio, family situation, and goals. Tax rules will continue evolving, so it’s important to review your approach regularly.

This article provides general educational information only and does not constitute personal tax or financial advice. Tax treatment depends on individual circumstances and may change in the future. Verify current rates and allowances at gov.uk and consult a qualified tax adviser for guidance specific to your situation.