Yes, you generally do pay tax on UK investments, but the rules break into three separate charges: Capital Gains Tax when you sell at a profit, income tax on dividends and interest while you hold, and Stamp Duty Reserve Tax when you buy UK shares. Each has its own allowance and rate, and holding investments inside an ISA or pension can remove all three.
Capital Gains Tax When You Sell
CGT is triggered by a disposal, not by a profit reaching your bank account. Selling shares, gifting them to anyone other than a spouse or civil partner, and swapping one asset for another all count.1legislation.gov.uk. Taxation of Chargeable Gains Act 1992 Giving away an appreciated asset produces a tax charge based on its market value on the day you hand it over.
Every individual gets an annual exempt amount of £3,000 for the 2025/26 tax year, down from £6,000 two years earlier.2GOV.UK. Capital Gains Tax Rates and Allowances Only gains above that figure are taxed.
Rates changed from 30 October 2024. For disposals made from 6 April 2025 onwards, basic rate taxpayers pay 18% and higher or additional rate taxpayers pay 24% on investment gains.2GOV.UK. Capital Gains Tax Rates and Allowances The older 10% and 20% rates on shares and other non-property assets are gone. Which rate you actually pay depends on where the gain sits once stacked on top of your other taxable income. If part of it falls inside the basic rate band and part above, you pay 18% on the lower slice and 24% on the rest.
To work out the gain, take what you received on disposal, subtract the original cost including dealing fees and any stamp duty paid, then subtract your £3,000 allowance and any allowable losses. What remains is taxable.
How Share Cost Basis Is Calculated
If you bought the same shares at different prices over time, HMRC’s matching rules decide which cost applies when you sell. The order matters, and getting it wrong is a common self-assessment error.
Section 104 Pooling
The default is to pool all your holdings of the same share into one block. Each purchase adds to the pool; each sale removes a proportionate slice of the pooled cost.3GOV.UK. CG51550 – Share Identification Rules for Capital Gains Tax From 6.4.2008 What you end up with is a weighted average cost per share that becomes your base cost on any disposal.
Same-Day and 30-Day Matching
Before the pool comes into play, HMRC first matches a disposal against shares of the same class bought on the same day, then against any bought within the 30 days following the sale.4GOV.UK. HS284 Shares and Capital Gains Tax (2024) This blocks the old “bed and breakfasting” tactic of selling to book a loss and immediately buying back. Repurchase within 30 days and the new price becomes the disposal’s cost basis, effectively wiping out the loss you were trying to lock in.
Using Losses to Reduce Your Bill
Capital losses from the same tax year are automatically netted against your gains before the tax is calculated.5GOV.UK. Capital Gains Tax – If You Make a Loss Anything left over can be carried forward indefinitely and used against gains in future years.
Ordering matters. Current-year losses must be used first, even if that pushes your gain below the £3,000 allowance and wastes it. Losses brought forward from earlier years only need to reduce the gain down to the allowance, so the £3,000 is protected.5GOV.UK. Capital Gains Tax – If You Make a Loss
You claim a loss on your Self Assessment return. If you aren’t registered because you’ve never had gains to report, write to HMRC instead. The deadline is four years after the end of the tax year the loss occurred in, so don’t assume old losses stay claimable forever.5GOV.UK. Capital Gains Tax – If You Make a Loss
Tax on Dividends
Dividends have their own allowance and their own rates, separate from your salary. The first £500 of dividend income each year is tax-free regardless of your income.6GOV.UK. Tax on Dividends That allowance has been halved twice recently, from £2,000 to £1,000 and now to £500.
Above the allowance, the rate depends on your income tax band. From 6 April 2026, the basic and higher rates rise by two percentage points:
- Basic rate: 10.75% (up from 8.75%)
- Higher rate: 35.75% (up from 33.75%)
- Additional rate: 39.35% (unchanged)
The new rates apply to dividends received from 6 April 2026 onwards.7GOV.UK. Changes to Tax Rates for Property, Savings and Dividend Income To find your rate, add total dividends to your other earnings. If the combined figure crosses a band, you’ll pay more than one rate on different slices.
Scotland sets its own income tax bands, but dividend and savings rates are set at Westminster. A Scottish taxpayer pays the same dividend rates as everyone else in the UK; the Scottish bands only matter in determining overall income level, and the dividend rate band that applies is the UK-wide one.8Scottish Government. Scottish Income Tax 2026 to 2027 Technical Factsheet
Tax on Savings Interest
Interest on bank and building society accounts is taxed as income, but the Personal Savings Allowance shields part of it:9GOV.UK. Tax on Savings Interest – Personal Savings Allowance
- Basic rate taxpayers: £1,000 tax-free
- Higher rate taxpayers: £500 tax-free
- Additional rate taxpayers: no allowance
Anything above your allowance is taxed at your normal income tax rate. Banks pay interest gross now, so you have to track the total and report it once it goes over.
Tax on Cryptocurrency
HMRC treats crypto like any other asset for CGT. A taxable disposal happens when you sell for cash, swap one token for another, spend it on goods or services, or give it away to anyone other than a spouse or civil partner.10GOV.UK. Check if You Need to Pay Tax When You Sell Cryptoassets The same 18% and 24% rates apply, and the same £3,000 annual exempt amount reduces the gain.
The swap rule catches people out. Moving Bitcoin into Ethereum counts as disposing of the Bitcoin at market value on that day, and CGT is due on any gain since you first bought it, even though no cash left the wallet. Self Assessment returns now include a dedicated cryptoasset section from the 2024/25 tax year onwards.10GOV.UK. Check if You Need to Pay Tax When You Sell Cryptoassets
Stamp Duty When You Buy UK Shares
Buy UK shares electronically through a broker and Stamp Duty Reserve Tax of 0.5% is charged on the purchase price.11GOV.UK. STSM031010 – Scope of Stamp Duty Reserve Tax (SDRT) – Rates of Tax The broker collects and pays it automatically; you’ll see it on the contract note.
SDRT applies only at purchase, not on sale. It doesn’t apply to gilts, corporate bonds, or most exchange-traded funds domiciled outside the UK. Shares in newly listed companies on a UK regulated market may qualify for a three-year SDRT exemption on transfers made from 27 November 2025 onwards.12GOV.UK. Stamp Duty Reserve Tax – UK Listing Relief
How to Avoid Investment Tax Legitimately
The cleanest way to sidestep all three charges is to hold investments inside a tax-free wrapper. Within these accounts there is no CGT, no tax on dividends or interest, and nothing to declare to HMRC.
Individual Savings Accounts
You can put up to £20,000 per tax year across all your ISAs combined. Growth, dividends, and interest inside the wrapper are entirely tax-free and never appear on a tax return.13GOV.UK. Individual Savings Accounts (ISAs) – How ISAs Work The £20,000 can be split between a Cash ISA, Stocks and Shares ISA, Innovative Finance ISA, and Lifetime ISA in any combination. Left inside the wrapper, investments can compound for decades without generating any tax liability.
Lifetime ISA
The Lifetime ISA is for adults aged 18 to 39 saving for a first home or retirement. You can contribute up to £4,000 a year (counting towards the £20,000 overall ISA limit), and the government adds a 25% bonus, up to £1,000 per year.14GOV.UK. Lifetime ISA Overview Withdraw for anything other than a first home or reaching age 60 and a 25% charge is applied to the whole amount taken out, including the bonus. Because the charge lands on the full withdrawal, you end up losing more than just the bonus. Treat it as genuinely locked away unless you’re sure you qualify.15GOV.UK. Withdrawing Money From Your Lifetime ISA
Pensions
Self-Invested Personal Pensions and workplace schemes offer income tax relief on contributions. Basic rate relief is added automatically by the provider; higher and additional rate taxpayers claim the rest through Self Assessment. The annual allowance is £60,000, tapered for those with adjusted income above £260,000.16GOV.UK. Tax on Your Private Pension Contributions – Annual Allowance Investments inside the pension grow free of CGT and income tax. The trade-off: you generally can’t access the money until age 55 (rising to 57 from April 2028), and withdrawals are taxed as income at that point.
Reporting and Paying What You Owe
Investment income and gains go on the Self Assessment return. Capital gains are reported on the SA108 supplementary pages; dividends and savings income sit on the main SA100.17GOV.UK. Self Assessment Tax Return Forms
The online filing deadline is 31 January after the end of the tax year. For 2025/26 (ending 5 April 2026), that means 31 January 2027. Miss it and you get an automatic £100 penalty even if no tax is owed. After three months, daily penalties of £10 begin, up to £900. At six months, a further 5% of the tax due or £300 (whichever is greater) is added, and the same again at twelve months.18GOV.UK. Self Assessment Tax Returns – Penalties
The tax itself is also due by 31 January, payable by Direct Debit, bank transfer, or the online service. Late payment accrues interest daily. Most platforms now issue an annual tax report summarising gains, losses, and dividend income, which spares you the job of piecing figures together from individual contract notes.