To invest in the UK, you open an account with a brokerage platform authorized by the Financial Conduct Authority, verify your identity, choose a tax wrapper that fits your goals (usually a stocks and shares ISA), fund the account from your UK bank, and place a trade. Most people get from application to first trade in under a day. The decisions that matter are made before any money moves: which platform, which account type, and whether you understand the taxes and costs attached to the trades you plan to make.
Start by Checking the Platform Is FCA-Authorized
Before you give any firm your bank details, confirm it is on the FCA’s Financial Services Register. The FCA runs a public Firm Checker where you can search a company name and see whether it has permission to hold client money and offer investment services.1Financial Conduct Authority. How to Check a Firm or Individual Is Authorised A firm not on the register is operating illegally, and you have no regulatory recourse if things go wrong.
When an FCA-authorized platform fails and there is a shortfall in client assets, the Financial Services Compensation Scheme can cover losses up to £85,000 per person per firm. The FSCS also pays out where bad financial advice caused a loss. It does not compensate you for shares that simply fell in value.2FSCS. Investments Most platforms also hold your investments in a nominee account, which legally separates your shares from the platform’s own assets, so if the platform collapses your holdings can be identified and transferred elsewhere.
What You Need to Open an Account
You have to be 18 to open a standard brokerage account, a stocks and shares ISA, or a SIPP.3GOV.UK. Junior Individual Savings Accounts (ISA) – Open an Account You also need to be a UK taxpayer for the tax-advantaged accounts, and your National Insurance number links your investment accounts to your tax records.4GOV.UK. National Insurance – Your National Insurance Number Every platform will ask for it.
Expect to prove who you are and where you live. Under the Money Laundering, Terrorist Financing and Transfer of Funds Regulations 2017, firms must confirm your name and address before opening the account.5Legislation.gov.uk. The Money Laundering, Terrorist Financing and Transfer of Funds (Information on the Payer) Regulations 2017 – Regulation 30 A passport or UK photocard driving licence works for identity. A utility bill or council tax letter dated within the last three months works for address.
If you plan to deposit a large sum, be ready for source-of-wealth questions. Platforms may ask for bank statements, payslips, an employment contract, evidence of a property sale, or estate accounts showing an inheritance before releasing the funds for trading.6GOV.UK. Economic Crime Supervision Handbook – ECSH33358 – Source of Funds and Source of Wealth Smaller deposits usually clear without this step.
The application itself is digital. You will enter your full legal name, date of birth, three years of address history, employment status, National Insurance number, and your UK sort code and account number for future deposits and withdrawals. You will also make a tax residency declaration confirming you are a UK taxpayer, and if you hold tax residency elsewhere you need to declare that too. The platform runs an automated identity check in the background. Most applications clear in minutes. If your identity cannot be verified automatically, you upload documents and wait a few business days.
Pick the Right Account Type
The wrapper you choose decides how your returns are taxed, how much you can put in, and when you can take money out. Most UK investors end up using more than one.
Stocks and Shares ISA
For most people this is the default. You can contribute up to £20,000 per tax year across all your ISAs combined, and everything inside the wrapper grows free of capital gains tax and dividend tax.7GOV.UK. Individual Savings Accounts (ISAs) – How ISAs Work The £20,000 allowance holds for the 2026–2027 tax year. A stocks and shares ISA holds individual company shares, funds, investment trusts, and bonds. Gains and dividends inside the ISA never appear on your tax return.
Lifetime ISA
A Lifetime ISA is a specialist account for buying a first home or saving for retirement after 60. You can open one if you are 18 to 39 and contribute up to £4,000 a year until you are 50, with the government adding a 25% bonus of up to £1,000 a year.8GOV.UK. Lifetime ISA – Who Can Open a Lifetime ISA9GOV.UK. Lifetime ISA – Overview Your £4,000 LISA contribution counts toward the £20,000 overall ISA allowance, so this is not extra headroom.
Withdraw for anything other than a first home or reaching 60 and you pay a 25% charge on the amount removed, which actually leaves you with less than you put in.10GOV.UK. Lifetime ISA – Withdrawing Money From Your Lifetime ISA If there is any realistic chance you will need the money earlier for another purpose, a LISA is the wrong wrapper.
General Investment Account
A General Investment Account has no contribution limit and no special tax treatment. You deposit as much as you want and pay standard dividend and capital gains tax on the returns. Most investors use a GIA once they have filled their ISA allowance, or for holdings they want to sell and rebuy to realize losses.
Self-Invested Personal Pension
A SIPP is a pension wrapper where you pick the investments. Contributions get tax relief up to 100% of your earned income or £60,000 a year, whichever is lower.11GOV.UK. HM Revenue and Customs – Pension Tax Limits Basic-rate taxpayers get 20% added automatically; higher-rate (40%) and additional-rate (45%) taxpayers claim the rest through self-assessment.12GOV.UK. Tax on Your Private Pension Contributions – Tax Relief The money is locked away until the normal minimum pension age, currently 55 and legislated to rise to 57 in April 2028.13GOV.UK. Increasing Normal Minimum Pension Age
What You’ll Pay in Tax and Trading Costs
Returns inside an ISA or SIPP are sheltered. Returns in a GIA face two taxes, and every UK share purchase carries a couple of government-mandated costs on top of your platform’s own fees.
Dividend Tax
Outside an ISA or SIPP, you get a £500 dividend allowance per tax year, in place for both 2025–2026 and 2026–2027. Above that, the rate depends on your income tax band: 8.75% for basic rate, 33.75% for higher rate, and 39.35% for additional rate.14GOV.UK. Tax on Dividends Dividends received inside an ISA are tax-free regardless of amount, which is one of the strongest reasons to use the ISA allowance first.
Capital Gains Tax
Sell shares or funds in a GIA for more than you paid and the profit is a capital gain. The annual exempt amount is £3,000.15GOV.UK. Capital Gains Tax Allowances From 6 April 2025, gains on shares and funds above that allowance are taxed at 18% for basic-rate taxpayers and 24% for higher-rate taxpayers.16GOV.UK. Capital Gains Tax Rates and Allowances Gains inside an ISA or SIPP are not subject to CGT.
Stamp Duty and the PTM Levy
Stamp Duty Reserve Tax is charged at 0.5% on electronic purchases of UK shares. Buy £10,000 of shares and £50 goes to HMRC automatically through your platform.17GOV.UK. Tax When You Buy Shares – Overview SDRT applies to purchases only, not sales.
The PTM levy is a flat £1.50 on any trade worth more than £10,000, on both buys and sells, and funds the Takeover Panel.18The Takeover Panel. PTM Levy Small enough to barely notice, but it appears on your contract notes.
Funding and Placing Your First Trade
Once your account is live, you fund it by bank transfer or debit card from the account dashboard. Bank transfers need a reference number the platform provides so the money lands against your account. Debit card deposits usually show instantly; bank transfers can take a few hours to a full business day.
To place a trade, search for the company name or ticker, then choose how many shares you want or how much to spend. There are two main order types:
- A market order executes immediately at the best available price. Simple and fast, but with less liquid stocks you might pay more than the last quoted price.
- A limit order sets the maximum you will pay (or minimum you will accept when selling), and only fills at that price or better. If the price never reaches your limit, it stays open until it expires or you cancel.
Market orders are usually fine for highly liquid FTSE 100 shares. Use a limit order when you are trading smaller companies or buying in size, because the price can move between the quote you see and the moment your order hits the market.
Before the order goes through, the platform shows a summary including SDRT and commission. You confirm, the order goes to market, and a contract note is generated. Keep those contract notes. They are your legal record of the transaction and you will need them to work out capital gains when you eventually sell.
When the Money Actually Moves
Trades on the London Stock Exchange currently settle on a T+2 basis, meaning legal ownership transfers two business days after the trade date.19London Stock Exchange. Market Notice – Implementation of T+2 Standard Settlement Period Your portfolio shows the shares straight away, but the back-office transfer takes two days. The UK is moving to T+1 settlement on 11 October 2027.20GOV.UK. Policy Note – Mandating T+1 Settlement in the UK If you sell and want to withdraw cash, the proceeds typically become available after settlement completes. Some platforms let you reinvest settled cash sooner but hold external withdrawals briefly.
If You’re a US Citizen
If you are an American citizen or Green Card holder living in the UK, the account-opening process above still applies, but US tax rules change which investments actually make sense. The US taxes based on citizenship, so you file a US return every year regardless of where you live.
Most UK-domiciled funds, unit trusts, and open-ended investment companies are treated as Passive Foreign Investment Companies under US tax law. The default PFIC tax treatment is punitive, with effective rates that can exceed 50% of gains once interest charges are added, and you have to file Form 8621 for each PFIC you own. Many UK platforms will not accept US citizens as clients at all because of the reporting burden FATCA puts on them.
The practical path is usually to stick to US-listed ETFs and funds (which are not PFICs for US tax purposes) through a platform that accepts American clients. You also need to file a Foreign Bank Account Report annually if the combined balance across your non-US financial accounts tops $10,000 at any point in the year. Penalties for getting this wrong start at $10,000 per form per year, with no statute of limitations. Cross-border tax advice is worth paying for before you open anything.