How do I avoid paying tax when I sell shares?

Smart Ways to Reduce Capital Gains Tax When Selling Shares

Selling shares can be rewarding, but the tax bill that follows doesn’t have to be steep. While you can’t completely avoid Capital Gains Tax (CGT), there are legal and effective ways to reduce what you owe—some of which many investors overlook.

Use your annual CGT allowance first. Everyone has a tax-free allowance on capital gains—make sure you're using it every year. If you're married or in a civil partnership, consider transferring assets to your spouse. Transfers between partners are tax-free, effectively doubling your allowance when planned wisely.

Have you made losses on other investments? Don’t forget to carry forward your capital losses. These can be offset against gains, reducing your overall tax bill. Plus, always deduct allowable costs like broker fees or advisory charges—every bit lowers your taxable gain.

Another smart move? Boost your pension contributions. Not only are you future-proofing your retirement, but higher pension savings can keep you in a lower tax bracket, reducing CGT exposure. Even better, max out your ISA allowance each year. Any profits within an ISA are completely tax-free. Try the “Bed and ISA” strategy: sell shares outside your ISA, then reinvest the proceeds into your ISA to shelter future gains.

If you're charitably inclined, donating shares directly to charity can be highly tax-efficient. Not only do you avoid CGT, but you also support a cause while potentially claiming income tax relief.

These aren’t tricks—they’re legitimate strategies used by savvy investors. Planning ahead, keeping accurate records, and understanding allowances can make a real difference. As always, speak to a financial adviser to tailor these ideas to your personal situation.