Ready-made and managed stocks and shares ISAs

A ready-made or managed stocks and shares ISA is one where the provider does the investing for you. Instead of choosing individual funds or shares yourself, you answer some questions about your goals and how much risk you are comfortable with, and the provider builds a portfolio to match, then keeps it running over time. A stocks and shares ISA is simply an ISA where the money is invested on the stock markets, and any growth and income inside it is free of income tax and capital gains tax¹.

The alternative is a self-managed ISA, where you pick your own investments. Vanguard, one provider that offers both, describes the managed version as one where "Our experts build your investment plan and manage your portfolio", and the self-managed version as one where "You manage your own portfolio"². Both sit inside the same legal wrapper: an ISA must be set up as a stocks and shares account, a cash account, an innovative finance account or a Lifetime ISA³. ISAs were introduced in 1999⁴, and the tax exemption covers interest, dividends and capital gains within the account⁵.

What a ready-made or managed ISA is, and how it differs from picking your own

A managed ISA is built around a model portfolio. The provider offers a small number of ready-made portfolios, usually graded by risk, and places you in the one that matches your answers to its questions. It then handles the day-to-day work of investing: buying the underlying funds, spreading money across different asset types, and rebalancing when the mix drifts away from its target. Some providers describe this as a robo adviser, because the initial questions and much of the ongoing management are handled online rather than by a person.

The self-managed route is different in kind, not just in degree. With a self-managed ISA you choose each investment yourself, from whatever range the platform offers. Vanguard's self-managed ISA, for example, lets you build your own investment plan by choosing from more than 85 funds². Even then, the line can blur: the same provider notes that it also has "ready-made funds that help balance risk"², so a self-managed investor can still buy a single balanced fund and effectively get a ready-made portfolio in one purchase.

What you give up with the managed version is control over the individual holdings, and what you gain is not having to make those decisions. The provider chooses investments based on your risk profile², and you receive guidance from its investment experts rather than making each call yourself. The tax treatment is identical either way: the ISA wrapper, not the management style, is what delivers the tax exemption⁵. The real differences are in the charges, which tend to be higher for managed portfolios, and in how much involvement you want.

How a managed ISA builds and runs your portfolio around your risk profile

Every managed ISA starts with a set of questions. These typically cover your goals, how long you plan to invest for, and how you would feel about your investments falling in value. Your answers place you on a risk profile, and the provider then chooses investments based on that profile². A cautious profile usually means a portfolio weighted towards lower-risk assets, while a higher-risk profile takes more exposure to stock markets in exchange for potentially higher returns.

Once the profile is set, the portfolio is built from funds that the rules allow. Only authorised or recognised funds may be held in a stocks and shares ISA under current law¹⁰, which is why managed portfolios are almost always built from authorised collective funds rather than individual shares. The provider then manages the portfolio on an ongoing basis², which in practice means rebalancing: if one part of the portfolio has grown faster than the rest, the provider sells some of it and buys more of the others to bring the mix back to target.

The process is the same whether you start with a large lump sum or small monthly contributions. Providers typically let you change your risk profile later, and some allow you to switch to a self-managed ISA at any time², which is covered in more detail below.

The ISA allowance: £20,000 a year across all your ISAs

The annual ISA allowance is £20,000 per tax year⁶. During the 2026-27 tax year, which runs from 6 April 2026 to 5 April 2027, you can place up to £20,000 into an ISA¹. That figure is a total across all your ISAs, not a separate limit for each one: if you pay £12,000 into a cash ISA, you can put at most £8,000 into a stocks and shares ISA in the same tax year.

Since 6 April 2024 you can open and pay into more than one ISA of the same type in a tax year¹¹, so you could hold two managed stocks and shares ISAs with different providers at once, as long as the combined payments stay within £20,000. This is a recent loosening of the rules: when ISAs were first reformed in 2008, an individual could subscribe to two ISAs in a tax year, one cash and one stocks and shares, each a single component account¹². There is now no specific limit on how many ISAs you can hold overall, and for most types you can open and pay into multiple accounts of the same type in the same year¹³.

Two points about the allowance matter for managed ISA investors. First, transfers between providers do not use the allowance: you can move existing cash ISAs and stocks and shares ISAs into a new stocks and shares ISA without affecting your allowance¹. Second, unused allowance does not roll over: it resets each 6 April, so money you could have paid in during one tax year cannot be added in the next. The deadline for using each year's allowance is 5 April, covered in the ISA deadline and the end of the tax year.

Fees and charges: account, fund and management costs added together

The cost of a managed ISA comes in layers, and it is the combination that matters, not any single fee. There is usually a platform or account fee for holding the ISA, a management fee for the managed service, and the underlying costs of the funds the portfolio is built from. On top of those sit the costs of buying and selling investments.

The regulator requires firms to show you these costs in a standard way. The rules on costs and charges information require a one-off entry costs figure, a one-off exit costs figure, an ongoing costs figure, a transaction costs figure, and performance fees and carried interests¹⁴. This means a provider must tell you what it costs to get in, what it costs each year, what trading costs, and what it costs to leave, before you invest.

Minimum investments vary by provider. Vanguard's Managed ISA takes a single payment of £500, or a monthly Direct Debit from £100². The ISA regulations themselves set no legal minimum, so the entry point depends entirely on the provider's own terms, and a provider's current product page is the place to confirm the figure that applies before opening an account.

Because managed services charge for the management as well as the platform and the funds, they tend to cost more in total than a self-managed ISA holding similar funds. The trade-off is that the ongoing decisions are made for you. The full breakdown of how ISA fees work, including platform fees, fund charges and dealing costs, is in ISA fees and charges.

Who can open one: age, residency and account rules

The minimum age for opening an ISA has been harmonised at 18 years⁷. That applies to stocks and shares ISAs generally, including managed ones, and to cash ISAs too, so anyone under 18 cannot hold one in their own name. A Lifetime ISA has its own window: an account can only be opened by an adult younger than 40¹⁵.

ISAs are individual accounts, opened using your national insurance number, and cannot be held in joint names¹⁶. You cannot open one for another adult, and you cannot hold one jointly with a partner. The exception is the Junior ISA: a person with parental responsibility for someone under 18 who is resident in the UK can open a Junior ISA for them, the account is held in the child's name, and the person opening it must be at least 16¹⁷. An application to open a Junior ISA may only be made if the account will be held by an eligible child immediately after opening¹⁸.

Residency matters because the ISA rules are tied to UK residence, and the account is tied to your national insurance number¹⁶. The detailed rules, including how they apply if you move abroad, are in who can open an ISA and can a non-UK resident pay into an ISA.

How to open a managed ISA and what you need to apply

Opening a managed ISA is done online with most providers, and the application usually takes less than half an hour. In practice you need:

1. Your national insurance number, which identifies you as the account holder¹⁶.
2. Proof of identity and address, if the provider cannot verify you electronically.
3. Answers to the provider's risk questions, covering your aims, time horizon and attitude to losses².
4. A UK bank account or debit card, for paying money in.
5. Details of any existing ISAs you want to transfer in.

The rules were simplified in April 2024, removing the requirement to make a fresh application to open an account that you already hold¹⁹. In practice this means that if you already have an ISA with a provider and want to open another account with it, you do not have to complete the full application process again.

Once the account is open and your risk profile is set, the provider builds the portfolio and begins managing it². If you change your mind within a short period of opening, ISA rules give you a cancellation window: the details are in cancelling an ISA: cooling-off rights.

Moving between managed and self-managed, and transferring from another provider

Two kinds of move are possible, and they are separate decisions. The first is between management styles with the same provider. Vanguard, for example, allows you to switch between its Managed and Self-managed ISA options whenever you like². If you start with a managed portfolio and later want to pick your own funds, or the reverse, this can be done without moving your money elsewhere, though the provider's own terms set out how holdings are handled during the switch.

The second is transferring the ISA itself to a different provider. This must be done as a transfer, not by withdrawing the money and paying it in again, because withdrawing uses up allowance and can lose tax advantages. You arrange the transfer through the new provider, which contacts the old one: NS&I, for example, tells customers wanting to transfer out to contact the new provider, who will arrange the transfer¹¹. Transfers of existing cash ISAs and stocks and shares ISAs into a new stocks and shares ISA do not affect your allowance¹.

You can also transfer part of a balance rather than all of it, which was not possible in earlier tax years¹³. Cash ISA transfers must be made within the time set by the transfer regulations, and the rules govern the period during which the old account manager ceases to act²⁰. The step-by-step process, and what to do if a transfer is slow, is in how to transfer an ISA and compensation if my ISA transfer is delayed.

Your money can fall in value, and the ISA does not change that

The single most important thing to understand about a managed stocks and shares ISA is that the tax wrapper does not protect the value of your money. As NS&I's own ISA guidance puts it: "The value of your investments can fall as well as rise, and you may get back less than you put in."⁸ A cash ISA is different, because the money you put in cannot go down⁸, but a stocks and shares ISA invests in the markets and moves with them.

A managed portfolio spreads risk across many holdings, and the risk questions are designed to match the portfolio to what you can tolerate, but neither removes the underlying risk. The regulator's wording on a comparable product makes the point plainly: "An IFISA does not reduce the risk of the investment or protect you from losses, so you can still lose all your money. It only means that any potential gains from your investment will be tax free."²¹ The same logic applies to a managed stocks and shares ISA: the tax treatment is favourable, the investment risk is yours.

What does protect you is different in kind. If the provider fails, stocks and shares ISAs may be covered under investment protection, which is the Financial Services Compensation Scheme²². That covers the failure of the firm holding your money, not falls in the market value of your investments. How this works is explained in how your ISA is protected.

Changes to ISA rules on cash and transfers from April 2027

A set of rule changes takes effect from 6 April 2027, and several of them bear directly on stocks and shares ISAs. The Individual Savings Account (Amendment) Regulations 2026 provide that transfers from a stocks and shares ISA or innovative finance ISA to a cash ISA are prohibited where the account holder is below the age of 65²³. The draft legislation confirms the mechanics, and the changes come into force on 6 April 2027²⁴.

The same package introduces a charge on cash held inside a stocks and shares ISA: no relief from tax applies to interest or alternative finance return on cash deposits held under a stocks and shares component, and the account manager must pay a flat rate charge to the Board at the savings basic rate in force for the year²⁵. HMRC's guidance confirms that it will remain possible to transfer from a cash ISA to a non-cash ISA²⁶, so the restriction runs one way: money can move into stocks and shares ISAs from cash, but not back out into cash for those under 65.

This is not the first time the transfer rules have changed. Regulation 21 of the original ISA rules prohibited the transfer of investments from a stocks and shares ISA to a cash ISA²⁷, and that prohibition was lifted in 2014, when regulation 21(4A) was revoked so as to permit transfers from stocks and shares ISAs to cash ISAs²⁸. The 2027 rules partially reverse that for younger savers. The full detail, including the new cash limits, is in changes to the cash ISA limit.

Is interest on cash in a stocks and shares ISA already taxed?

Yes, and this is a point many investors miss. While the investments inside a stocks and shares ISA are free of income tax and capital gains tax⁵, interest on cash sitting uninvested in the account is treated differently. The rules have long provided that interest arising on uninvested cash held in a stocks and shares ISA is subject to a flat rate charge representing tax at basic rate²⁷. The charge is paid by the account manager, and no repayment of tax or amounts representing tax may be made to the account investor receiving or entitled to such interest²⁴.

From April 2027 the charge is set at 22%. Which? reported in July 2026 that "Cash held in stocks and shares Isas could be taxed at 22% from April 2027", describing it as "a 22% charge on the interest that you earn on cash held in stocks and shares ISAs"⁹. The legislation confirms that no relief from tax applies to such interest, with the account manager paying the flat rate charge²⁵.

For a managed ISA investor this matters in two situations: money waiting to be invested after you pay it in, and proceeds from sales waiting to be withdrawn. Neither is a reason to avoid the ISA, but it means holding large sums as cash inside a stocks and shares ISA for long periods is less tax-efficient than it may appear. What counts as cash-like is also being narrowed: the new rules target cash deposits, while money market funds remain eligible investments under the final rules. The tax position of ISAs generally is in ISAs and tax: what is tax free and what is not.

Complaints and where to get help

Stocks and shares ISAs generate a significant volume of complaints to the Financial Ombudsman Service. In 2024/25 the stocks and shares ISA was the most complained-about investment product, with 1,655 new complaints³⁰. In the first quarter of 2025/26 there were 361 new complaints about stocks and shares ISAs, with a 39% uphold rate³¹, and by the first quarter of 2026/27 the number of new stocks and shares ISA complaints had risen to 392, with cash ISA complaints at 620³³.

If something goes wrong, the first step is to complain to the provider, which must respond within a set time. If you are unhappy with the response, or the provider does not respond in time, you can bring a complaint about your individual savings account to the Financial Ombudsman Service³⁴. The ombudsman's service is free to use. If your complaint is about stocks and shares that you hold in an ISA, the ombudsman directs you to its page for consumers about ISAs³⁵, and if you are unhappy about advice you have received, or the way your adviser or investment company managed your ISA, you may complain to the ombudsman about that too³⁶.

Typical grounds for complaint about a managed ISA include the portfolio not matching the risk profile you agreed, misleading information about charges, or delays and errors in transferring or withdrawing money. The process for complaining, and what the ombudsman can and cannot do, is in complaining about an ISA provider.

When an ISA holder dies, and inheritance tax

When someone holding a stocks and shares ISA dies, the ISA ends and its investments and cash become part of their estate. Whoever handles the estate should ask the ISA fund manager for a valuation, using the closing price on the day the person died³⁷. Any uninvested cash held in the ISA must be included in the valuation³⁷.

A stocks and shares ISA does not shelter investments from inheritance tax: stocks and shares ISAs do not shield your investments from inheritance tax, or from stamp duty when buying shares¹. The tax advantages of the ISA end with the holder's death, and inheritance tax may apply to the estate depending on its total value and who inherits it. A surviving spouse or civil partner may be able to inherit an additional permitted subscription, extra ISA allowance based on the value of the deceased's ISAs, covered in additional permitted subscription.

Lifetime ISAs have their own death rules: a Lifetime ISA ends on the date of the holder's death, and there is no charge to withdraw the funds or assets from the account³⁸. The manager must withdraw and repay any government bonuses claimed on payments made after the date of death³⁹. What happens to ISAs generally on death is in what happens to an ISA when someone dies.