Best investing platforms for beginners in the UK

A UK investing platform is two decisions stacked together: the account wrapper and the provider that holds it. The wrapper decides the tax treatment. The provider decides the fees, what you can buy, and how pleasant the app is to use on a Tuesday evening.

Most beginners start with one of three wrappers:

• Stocks and Shares ISA. GOV.UK sets the overall ISA allowance at £20,000 for the 2026 to 2027 tax year. Gains and dividends inside it are free of UK tax, and you can withdraw at any time.
• SIPP (self-invested personal pension). Under relief at source, GOV.UK says the provider claims basic rate relief of 20% and adds it to the pot. The money is locked until normal minimum pension age, which HMRC puts at 55 now and 57 from April 2028. GOV.UK puts the annual allowance at £60,000 for the current tax year.
• Lifetime ISA. Up to £4,000 a year with a 25% government bonus, worth up to £1,000 a year, for a first home or for later life. GOV.UK says the first payment has to be made before you turn 40.

One change is already announced. GOV.UK says that from April 2027 the cash ISA limit falls to £12,000 for savers under 65, with rules to make sure the limits operate as intended. Money paid into a Stocks and Shares ISA is not covered by the new cash limit.

The table shows the costs a beginner meets first: what it costs to hold, what it costs to buy, and what happens when pounds become dollars for a US share.

Two costs are the same everywhere because the government sets them. AJ Bell's schedule notes stamp duty of 0.50% on purchases of UK shares, and no stamp duty on ETFs, unit trusts, OEICs or gilts. The PTM levy of £1.50 applies to UK equity trades over £10,000. A beginner buying a global index ETF pays neither.

Trading 212's help centre lists the fees on its Invest account, ISAs and SIPP as: trading commission free, custody fee free, FX fee 0.15%. The same article says the FX fee is the only fee Trading 212 can charge on those accounts, so there is no separate SIPP account fee. The FX fee applies only when a currency is converted, so buying a pound-denominated ETF on the London Stock Exchange avoids it entirely.

What a beginner gets is a short list of costs: in pounds, the platform itself charges nothing to hold or to trade. The cost shows up in the spread of the ETF you choose and in the 0.15% when your pounds become dollars for a US share. Choosing the listing currency matters more here than choosing the app.

One fee to notice: its help centre says card, Apple Pay and Google Pay deposits are free until £2,000 has been deposited in total, after which a 0.7% fee applies. Bank transfers stay free.

AJ Bell is the long-established option in this group, and its fees are a percentage with a cap. Its ISA schedule, effective from July 2026, charges 0.25% a year on shares, ETFs and investment trusts, capped at £3.50 a month. Funds are 0.25% on the first £250,000, 0.10% on the next £250,000 and nothing above £500,000.

Dealing costs £5 per online share or ETF deal, falling to £3.50 if you placed 10 or more share deals the month before, and £1.50 per fund deal. Regular investments placed online cost nothing, which is the detail that matters most for a beginner investing a fixed amount each month.

The FX charge on international dealing is tiered: 0.75% on the first £10,000, 0.50% on the next £10,000, 0.25% above £20,000. That makes AJ Bell noticeably dearer than Trading 212 for anyone buying US shares directly. It also offers a Lifetime ISA, and its SIPP charges the same 0.25% on shares but with a higher cap of £10 a month.

Interactive Brokers UK lists £3 per trade for typical-sized Western European stock orders and 0.05% of trade value on larger orders, with no custody fee. It offers a Stocks and Shares ISA, though its pricing page notes that a minimum activity fee applies to ISA accounts. It does not open a SIPP directly: it works with SIPP administrators, so the pension sits with a separate firm.

The trade-off is breadth against simplicity. Interactive Brokers reaches far more exchanges and order types than the other two, which matters more to a larger account trading abroad. For a beginner putting £200 a month into one index fund, most of that breadth goes unused and the per-trade charge is a real cost.

This comparison comes up because Public is one of the most visible commission-free apps. For a UK resident, it resolves quickly: Public's help centre says an account needs a valid Social Security Number and a legal US residential address. A UK beginner is choosing between AJ Bell and Trading 212.

Between those two, a worked example shows where the cost lands. Take a £10,000 Stocks and Shares ISA holding one ETF, topped up monthly:

• AJ Bell, regular investing. Account charge 0.25% of £10,000 is £25 a year, under the £42 annual cap (12 x £3.50). Regular investments online are free. Roughly £25 a year.
• AJ Bell, buying by hand. The same £25, plus 12 deals x £5 = £60. Roughly £85 a year.
• Trading 212. No account fee, no commission, and no FX fee on a pound-denominated ETF. £0 in platform charges.

At £50,000 the AJ Bell share charge would be £125 a year uncapped, but the cap holds it at £42. The cap is why AJ Bell becomes more competitive as a shares-and-ETFs account grows. Its fund charge has no such cap below £250,000, so £50,000 in funds costs £125 a year.

For a US reader, the equivalent question is answered on our page about beginner investing apps, where Public and Robinhood sit alongside the other US brokers.

Here the comparison is about style more than price. For UK residents Public again drops out, leaving two platforms that are both cheap but cheap in different ways.

• Trading 212 costs nothing to hold or trade in pounds and 0.15% on currency conversion. It fits regular, small deposits into a few funds or shares.
• Interactive Brokers charges £3 a typical UK trade and offers deep market access. Twelve monthly buys cost £36 a year in commission, which is small on a large account and noticeable on a small one.

A common pattern is to start on the simpler app and move later if the needs change. ISAs can be transferred between providers without losing the tax wrapper, as long as the transfer goes through the receiving provider rather than a withdrawal and redeposit. AJ Bell lists no charge for a transfer in from another ISA manager, and Trading 212's help centre says the FX fee is the only fee it can charge on its Invest, ISA and SIPP accounts.

The fee tables point in a fairly consistent direction once you know how you plan to invest. These are the patterns, not a recommendation for any one person.

A small monthly amount into one or two ETFs

This is the most common beginner setup, and it is where platform fees bite hardest as a share of the money. Trading 212 charges nothing on a pound-denominated ETF. AJ Bell's regular investing route is also free to deal, leaving only the 0.25% account charge, which is £2.50 a year on every £1,000 held until the £3.50 monthly cap is reached.

Funds rather than ETFs

Many workplace and pension savers already know unit trusts and OEICs by name. AJ Bell lists them with a £1.50 dealing charge and the tiered 0.25% account charge, and its regular investing route removes the dealing charge. Anyone set on a particular fund should check first that the platform carries it.

US shares bought directly

Here currency conversion is the cost that matters. On £5,000 of US shares, AJ Bell's 0.75% first tier is £37.50, Trading 212's 0.15% is £7.50, and Robinhood UK lists 0.1% to 0.3%. A pound-denominated ETF that holds US companies sidesteps the conversion at the point of purchase.

A pension alongside the ISA

Trading 212 and AJ Bell both run their own SIPP. Interactive Brokers needs a separate SIPP administrator. A basic rate taxpayer who pays £800 into a relief-at-source pension ends up with £1,000 in the pot, because the provider claims the 20% relief and adds it, which is the reason a SIPP is often weighed against an ISA at all.

Someone who wants a person on the phone

AJ Bell lists telephone dealing at £25 a deal, which signals a phone service exists. Trading 212 and Robinhood UK are built around the app. For some beginners that difference outweighs a few pounds of fees.

The platform is the easy part to change later. The ISA rules come with you wherever the account sits, so they are worth reading once before the first deposit.

• Who can open one. GOV.UK says you must be 18 or over to open a Stocks and Shares ISA and resident in the UK (with an exception for Crown servants and members of the armed forces posted abroad, and their spouses or civil partners). A Lifetime ISA also has to be opened before you turn 40.
• More than one ISA in a year. The how ISAs work page says you can save up to £20,000 in one account or split the allowance across several, and its own example splits a year's allowance across two cash ISAs and a Stocks and Shares ISA. The Lifetime ISA is the exception: you can only pay into one per tax year. The tax year runs from 6 April to 5 April, so an unused allowance does not roll over.
• Shares you already own. The same page says you cannot move non-ISA shares you already hold into an ISA, unless they come from an employee share scheme. Getting existing holdings into the wrapper normally means selling them outside it and buying again inside, which can create a gain for Capital Gains Tax purposes.
• Moving to another platform. GOV.UK's transferring your ISA page says to contact the provider you want to move to and fill in its ISA transfer form. If you withdraw the money instead, you cannot reinvest that part of your tax-free allowance again.

Investing for a child: the Junior ISA

A parent or guardian with parental responsibility can open a Junior ISA for a child under 18 who lives in the UK. GOV.UK puts the limit at £9,000 for the 2026 to 2027 tax year. The child can take control of the account at 16 but cannot withdraw the money until 18, at which point it belongs to them. Not every platform offers one, so it is worth checking before choosing a provider if a child's account is part of the plan.

The 25% government bonus makes the Lifetime ISA look like free money, and for the two purposes it was built for it largely is. Outside those purposes it costs you. GOV.UK's Lifetime ISA withdrawal rules say you pay a 25% withdrawal charge if you take cash or assets out for any other reason. Because the charge applies to the whole amount, including the bonus, it takes back more than the bonus added.

The withdrawals that carry no charge:

• At 60 or over, for any reason.
• To buy a first home costing £450,000 or less, bought at least 12 months after your first payment into the account, through a conveyancer or solicitor, and with a mortgage.
• If you are terminally ill, with less than 12 months to live.

For a beginner, that makes the Lifetime ISA a good fit for money that is genuinely earmarked for a first home or for later life, and a poor place for an emergency fund. The £450,000 price cap matters most in higher-priced areas, where a typical first home can sit above it.

Some beginners fill their ISA and keep going in an ordinary investment account, sometimes called a general investment account. Every platform in this guide offers one. The difference is tax, and it shows up in two places.

Dividends

GOV.UK gives everyone a dividend allowance of £500 a year. Above that, for the 2026 to 2027 tax year, dividends are taxed at 10.75% for basic rate taxpayers, 35.75% at the higher rate and 39.35% at the additional rate. Dividends from shares held in an ISA are not taxed at all.

Capital gains

The Capital Gains Tax allowance is £3,000 a year for an individual. Gains above it, made when you sell investments held outside an ISA or pension, may be taxable. Inside an ISA there is nothing to report.

Those allowances are small enough that a beginner investing a few hundred pounds a month can outgrow them within a few years. That is the practical reason the ISA usually comes first, and the general account second.

A UK investor buying US shares directly meets a piece of US paperwork. The IRS describes Form W-8BEN as the certificate a foreign individual gives to the withholding agent or payer to document foreign status for US tax withholding. In practice the platform collects it, usually as a short form during sign-up or before your first US purchase.

It matters because of dividends. US tax is withheld from dividends paid to foreign investors, and the US and UK tax treaty caps the US rate on most portfolio dividends paid to UK residents at 15 percent, according to the IRS technical explanation of the treaty. Without a valid W-8BEN on file, the platform cannot apply the treaty rate.

Two points that catch beginners. The form covers withholding on income such as dividends, not the price you pay or receive for the shares. And it expires: platforms ask for a fresh one every few years, so a reminder email from the platform is worth acting on rather than ignoring. A pound-denominated ETF listed in London that holds US companies avoids the form for that holding, because you do not own the US shares directly.

Walnut is an AI investing app. It does not hold your money; it connects to the broker where your account already sits. The steps for a UK investor:

1. Connect the account

Link your broker from the brokerage page. AJ Bell and Interactive Brokers connect for reading: Walnut sees your holdings, shows them against the S&P 500, and gives a keep, trim or exit read on each one. Trading 212 also takes orders you approve inside Walnut.

2. Ask the assistant about what you hold

The assistant reads your actual portfolio, so a question such as how concentrated the account is in US technology gets an answer about your holdings rather than a general one.

3. Build a basket

A basket is a set of holdings with target weights and a written thesis. Walnut tracks it against the S&P 500, shows how far each holding sits from its target, and drafts the trades that would bring it back.

4. Approve any trade yourself

Walnut places the orders you approve at Public and Robinhood (where Robinhood buys go into a Robinhood Agentic account) and at E*Trade, tastytrade, Webull, moomoo, Questrade, Wealthsimple, Trading 212 and Stake (Australia). Every other connected broker, including AJ Bell and Interactive Brokers, is read in full. Nothing is bought without your approval.

The steps are broadly the same at every platform in this guide, and most take one sitting on a phone.

1. Have your details ready

ISA providers ask for your National Insurance number, a UK address and a UK bank account to fund from. Platforms also run identity checks, which sometimes ask for a photo of a passport or driving licence.

2. Choose the wrapper first, then the platform

Decide whether this money belongs in a Stocks and Shares ISA, a Lifetime ISA, a SIPP or an ordinary account, using the rules above. Then check the platform offers that wrapper. Interactive Brokers, for example, does not run a SIPP itself.

3. Fund it by bank transfer

Bank transfers are free at all three. Trading 212 charges 0.7% on card and wallet deposits once £2,000 has been deposited that way in total, so a bank transfer is the cheaper habit.

4. Set up the regular investment

A fixed monthly amount into one or two funds does most of the work for a new investor, and at AJ Bell it is also what removes the £5 dealing charge. Check the currency of what you buy: a pound-denominated ETF avoids the FX fee at every platform here.

• Comparing headline prices only. A zero-commission app with a high FX fee can cost more than a platform with a small dealing charge, if most purchases are US shares.
• Withdrawing to switch. Taking money out of an ISA to move it uses up allowance on the way back in. A formal transfer keeps the wrapper.
• Putting short-term money in a SIPP. The tax relief is real, but the money stays locked until 55, or 57 from April 2028.
• Treating FSCS cover as a guarantee. The £85,000 limit applies when a firm fails and cannot return your assets. It never covers a fall in prices.
• Paying a dealing charge on every monthly top-up. At AJ Bell, setting up a regular investment removes the £5 charge that a manual purchase would carry.

AJ Bell fees: ISA charges and SIPP charges (effective July 2026). Trading 212: fees in the Invest, ISAs and SIPP and fees for funding an account. Interactive Brokers UK: European stock commissions, pricing overview and SIPP accounts. Robinhood UK: Stocks and Shares ISA. Public: eligibility. GOV.UK: ISAs, cash ISA limit reduction, Lifetime ISA, pension tax relief, annual allowance and pension age. FSCS investment protection. More GOV.UK: how ISAs work, transferring your ISA, Junior ISAs, Lifetime ISA withdrawals, tax on dividends and Capital Gains Tax allowances. IRS: about Form W-8BEN and the technical explanation of the US and UK tax treaty. Walnut is not a registered investment adviser, and this guide is educational rather than personalised advice.