Jasmine Birtles
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Capital Gains Tax and Dividend Tax for Beginners: What to Know Before You Invest Outside an ISA
Moneymagpie Team
5th Nov 2026
Most beginners hear “tax” and mentally tune out. Fair enough, but a few minutes of understanding here could save you real money. If you invest through a stocks and shares ISA, you can skip most of this. If you invest outside an ISA, in what is usually called a general investment account (GIA), two taxes can come into play: capital gains tax and dividend tax.
A quick note: the figures below are the 2026/27 UK tax year rates as shown on GOV.UK when this was written. Tax rules and allowances change, so always check the latest on GOV.UK.
First, why ISAs matter
Gains and dividends on investments held in an ISA are tax-free. According to GOV.UK, the maximum you can save in ISAs in 2026/27 is £20,000. For most beginners, filling your ISA first is the easy way to avoid the taxes below.
Our guide to the best Stocks and Shares ISAs is a good place to start. But if you have used up your ISA allowance, or are investing a larger sum, read on.
What is capital gains tax (CGT)?
Capital gains tax is a tax on the profit you make when you sell (or “dispose of”) an investment for more than you paid for it. You are taxed on the gain, not the total you receive. GOV.UK’s example is an asset bought for £5,000 and sold for £25,000, which gives a £20,000 gain.
Importantly, you only pay tax if you sell. A share that has gone up in value on paper doesn’t trigger CGT until you actually dispose of it.
How much CGT might you pay?
Everyone gets a tax-free allowance, called the annual exempt amount. For 2026/27, GOV.UK says it is £3,000. Gains above that are taxed at 18% for basic rate taxpayers (within the basic rate band) and 24% for higher and additional rate taxpayers.
Here is a simple, hypothetical example. You buy shares for £5,000 and sell them for £9,000. Your gain is £4,000. Take off the £3,000 allowance and you have £1,000 taxable. At 18%, that is £180 of tax. At 24%, it is £240. (Your rate depends on your total income, so check how GOV.UK says the bands work.)
What about losses?
Losses can help. GOV.UK explains that losses are first deducted from gains made in the same tax year, and unused losses can be carried forward to future years. You generally need to report them to HMRC, and you can claim up to four years after the end of the tax year in which you sold.
See the GOV.UK guide to capital gains tax losses.
What is dividend tax?
A dividend is a share of a company’s profits paid to its shareholders. If you hold shares or funds outside an ISA, dividends can be taxable. You get a dividend allowance of £500 a year in 2026/27, and you only pay tax on dividend income above that, according to GOV.UK’s guide to tax on dividends.
Above the allowance, the rates for 2026/27 are 10.75% for basic rate taxpayers, 35.75% for higher rate and 39.35% for additional rate. Your band depends on your total income, including the dividends, so you may pay at more than one rate. Dividends that fall within your Personal Allowance are also untaxed.
Another hypothetical example: you are a basic rate taxpayer and receive £1,200 in dividends. The first £500 is covered by your allowance, leaving £700 taxable. At 10.75%, that is about £75 in tax.
One thing beginners often miss: with funds that reinvest (“accumulate”) dividends for you, the dividends can still count as income for tax purposes even though you never see the cash. Check the details for your fund, or ask HMRC or a tax adviser if you are unsure.
Which investments are exempt?
GOV.UK says shares held in an ISA are exempt from CGT, as are UK government gilts and gifts to a spouse, civil partner or charity (they usually aren’t taxed). Shares not held in an ISA, and units in unit trusts, can be taxable when sold. See GOV.UK on tax when you sell shares.
Simple ways to keep your tax bill down
- Use your ISA allowance first. It is the easiest tax shelter for most people.
- Use your annual allowances. The CGT and dividend allowances reset each tax year, and unused ones can’t be carried over.
- Consider selling in stages. Spreading sales over more than one tax year could let you use more than one CGT allowance, but don’t let tax drive an investment decision on its own.
- Think about a pension. Pensions are tax-efficient for long-term saving. Check the rules that apply to you.
- Keep good records. Note what you paid, when you bought, and any costs. It makes working out your gain far easier.
If you sell and quickly rebuy the same investment, special HMRC matching rules can affect how your gain is worked out, so check the rules before doing this.
What to do next
- Find out where your investments are held. ISA or general account? Only the second can create CGT and dividend tax.
- Check your allowances. Look up the current CGT and dividend allowances on GOV.UK.
- Start with an ISA. Use it before a taxable account. Our stock investing guide for complete beginners explains how to get going.
- Keep records and report if needed. If your gains or dividends are above the allowances, you may need to tell HMRC.
- Get help if it is complicated. Speak to a qualified tax adviser or use HMRC’s helpline. And remember you don’t need a huge pot to begin; see how much money you need to start investing.
Disclaimer: This article is for informational and educational purposes only and is not regulated financial, tax or legal advice. Tax treatment depends on your individual circumstances and may change. Figures are the 2026/27 tax year rates published on GOV.UK on 21 October 2026. Investing involves risk, and the value of your investments can go down as well as up, so you could get back less than you put in. Examples are hypothetical. Check GOV.UK or speak to a qualified tax or financial adviser before making decisions.
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