How to (Legitimately) Reduce Capital Gains Tax: 8 Ways

There’s a clear, legal difference between avoiding tax (planning within the rules to pay less) and evading it (hiding income, which is illegal). This guide is about the former — eight legitimate ways to reduce a Capital Gains Tax bill, using reliefs the rules specifically provide.

1. Use your annual exempt amount

Everyone gets a £3,000 tax-free allowance each year (2025/26). It can’t be carried forward, so if you’ve gains to crystallise, using it every year — rather than realising a big gain all at once — is the simplest saving.

2. Shelter investments in ISAs and pensions

Gains on assets inside an ISA or pension are completely free of CGT. Holding investments in these wrappers — and “bed and ISA” to move existing holdings in — removes future CGT entirely. For most investors this is the single most effective step.

3. Transfer assets to your spouse

Transfers between spouses and civil partners are CGT-exempt. Moving an asset (or a share) to your partner before a sale lets you:

Use both £3,000 allowances
Shift gains into a lower tax band if one of you is a basic-rate taxpayer

It’s simple, powerful and entirely legitimate.

4. Offset your losses

Capital losses are deducted from your gains, cutting the taxable amount. Losses can be carried forward to future years if you report them. Deliberately realising a loss to offset a gain (“loss harvesting”) is a recognised technique.

5. Spread disposals across tax years

Selling part of a holding in March and part in April uses two years’ allowances instead of one — and can keep more of the gain in the lower 18% band. Timing genuinely matters.

6. Claim Private Residence Relief

Your main home is normally exempt under Private Residence Relief. If a property was your home for part of the time you owned it, partial relief (plus the final 9 months) can still apply — valuable for former homes you later let out.

7. Claim Business Asset Disposal Relief

If you’re selling a business or qualifying company shares, Business Asset Disposal Relief applies a reduced CGT rate to qualifying gains up to a £1m lifetime limit. Winding up a solvent company can qualify too.

8. Plan the timing of big disposals

For large gains — a business sale, a property, a big share holding — when you sell can change the tax significantly, because of allowances, band thresholds and changing relief rates. This is where advice pays for itself many times over.

Plan, don’t just pay

Most people overpay CGT simply by not using the reliefs they’re entitled to — the allowance, ISAs, spousal transfers, losses and statutory reliefs. Our tax planning service builds these into a plan before you sell, and our Capital Gains Tax service handles the calculation and reporting. For the fundamentals, start with Capital Gains Tax explained.

Frequently asked questions

How can I legitimately avoid Capital Gains Tax?

Legitimate ways include: using your £3,000 annual exempt amount every year, holding investments in ISAs and pensions (gains are tax-free), transferring assets to a spouse to use both allowances and bands, offsetting capital losses against gains, spreading disposals across tax years, and claiming reliefs like Private Residence Relief or Business Asset Disposal Relief. These reduce or remove CGT within the rules — they're tax planning, not evasion.

Can I transfer assets to my spouse to save Capital Gains Tax?

Yes. Transfers between spouses and civil partners are exempt from CGT, so you can move an asset (or a share of it) to your partner before a sale. This uses both of your £3,000 allowances and can shift gains into a lower tax band if one of you is a basic-rate taxpayer — a simple, powerful and entirely legitimate move.

Do ISAs avoid Capital Gains Tax?

Yes — any gains on investments held within an ISA are completely free of Capital Gains Tax, and there's no CGT to report when you sell within an ISA. This is one of the simplest ways to shelter investment gains. 'Bed and ISA' lets you move existing holdings into an ISA to protect future growth.

Can I use capital losses to reduce CGT?

Yes. Capital losses are offset against your capital gains in the same year, reducing your taxable gain. Unused losses can be carried forward to future years if you report them to HMRC. Deliberately realising a loss to offset a gain — sometimes called loss harvesting — is a legitimate planning technique.

Is avoiding Capital Gains Tax legal?

Using allowances, ISAs, spousal transfers, losses and statutory reliefs to reduce CGT is legal tax planning — these are reliefs the rules specifically provide. That's very different from tax evasion (hiding gains), which is illegal. The aim is to pay the right amount of tax, using the reliefs you're entitled to.

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Reviewed by Provense Accountants

Written and reviewed by our team of qualified accountants (AAT-regulated). This guide is general information, not personal tax advice — book a free consultation for advice on your situation.