How to Buy Shares in the UK — A Beginner's Step-by-Step Guide

Six steps: (1) open a Stocks and Shares ISA rather than a general investment account, because everything inside it is free of UK capital gains tax and dividend income tax; (2) choose a platform, comparing the platform or custody fee, the dealing commission and the FX charge together rather than any one of them; (3) fund it — you can pay in up to £20,000 across all ISAs in the 2026/27 tax year; (4) search the share by ticker and check whether the price is quoted in pence; (5) place a market or limit order, remembering that 0.5% stamp duty reserve tax applies to most electronic purchases of UK shares; (6) the trade settles two business days later. Set up regular monthly investing afterwards, which most platforms charge far less for than ad-hoc trades.

£20,000 across all ISAs in the 2026/27 tax year, which runs from 6 April 2026 to 5 April 2027. That single allowance is shared between a Cash ISA, a Stocks and Shares ISA, an Innovative Finance ISA and a Lifetime ISA in whatever combination you choose, with the Lifetime ISA capped at £4,000 within it. The £20,000 figure has been frozen since 2017/18. Unused allowance does not carry forward — it is lost when the tax year ends, which is why platforms see a rush in late March and early April.

Yes. Stamp Duty Reserve Tax of 0.5% is charged on electronic purchases of UK-listed shares, and holding them in an ISA does not exempt it. This is the most commonly misunderstood point about ISAs: the wrapper shelters the growth and the income, not the transaction. It is charged on purchases only, not sales, so it penalises frequent trading rather than long holding. It does not generally apply to most exchange-traded funds or to overseas shares, which is part of why a global ETF portfolio can be cheaper to assemble than a portfolio of individual UK shares.

The annual exempt amount is £3,000 for 2026/27, unchanged from 2025/26 and dramatically lower than the £12,300 that applied in 2022/23. Gains above it are taxable at the rate applying to your income band. The dividend allowance is separately £500, down from £2,000 in 2022/23. Both cuts have made the Stocks and Shares ISA far more valuable than it used to be for ordinary investors: inside an ISA there is no capital gains tax and no dividend income tax at all, and nothing to report on a Self Assessment return. A 4% yield breaches the £500 dividend allowance at roughly £12,500 invested outside an ISA.

Very little. Commission-free platforms with fractional dealing let you start with £1–£25 and buy a slice of a high-priced share or ETF. On platforms charging per trade, dealing commission of roughly £5–£12 makes very small ad-hoc orders inefficient — a £10 fee on a £100 trade is 10% before the market moves. The practical route on those platforms is the regular monthly investment service, which commonly costs around £1.50 per deal. The bigger constraint is having an emergency fund and no high-interest debt first.

A market order deals immediately at the best available price — fast, but on a thinly traded share the fill can be worse than the price you saw. A limit order sets the maximum you will pay, or the minimum you will accept when selling, and only executes at that price or better; it protects you from a bad fill but may not execute at all. Many UK platforms also offer quote-and-deal, which shows you a live firm price and holds it for a few seconds while you accept. For FTSE 100 shares a market order is usually fine; for smaller companies and AIM stocks, where spreads widen considerably, a limit order is the safer choice.

Two business days — T+2 — for London-listed shares. Settlement is when legal ownership and money actually change hands; the trade itself is binding from execution. It matters if you are selling to fund a payment on a deadline, and around dividend record dates, since you must be the registered holder by the record date to receive the dividend. The UK is planning a move to T+1 settlement later this decade, following the United States and Canada, so expect this to shorten.

Yes — most UK platforms offer US and other international markets, and several offer fractional shares there. Two costs to plan for. First, currency conversion: you convert pounds to dollars going in and back coming out, and the charge varies enormously between platforms, from a few basis points to over 1% each way. Second, withholding tax: US dividends are withheld at 30% by default, reduced to 15% by lodging a W-8BEN with your broker under the UK–US tax treaty. Inside an ISA that 15% is generally not reclaimable, so an ISA shelters your US capital gains fully but not your US dividend withholding.

For most people, broad index funds are the better default. The long-run evidence is that the large majority of active funds and individual investors fail to beat a low-cost index, and one global index fund gives instant diversification in a single deal — with the incidental benefit that funds and ETFs are not generally subject to the 0.5% stamp duty that individual UK shares attract. There is a UK-specific trap worth naming: home bias pulls British investors toward the FTSE 100, which is concentrated in a few sectors and earns most of its revenue abroad, so it is neither a diversified portfolio nor a pure bet on the UK economy. If you enjoy company research, an index core with a small satellite of individual holdings is a reasonable structure.