ISA, pension or general account: where investments can be held

The same shares, funds and bonds can be held in three very different kinds of account: a stocks and shares ISA, a self-invested personal pension (SIPP), or a general investment account with no special tax treatment. Investment platforms typically offer all three side by side, so the practical question for most people is not what to buy but which account to buy it in¹.

The choice changes three things above all. Tax: an ISA shelters up to £20,000 of new money each tax year from income tax and capital gains tax³, a SIPP gives pension tax relief on money going in but locks it away, and a general investment account has no limits but its returns are taxable⁴. Access: ISA money can be withdrawn at any time with no statutory lock-in⁵, while SIPP money usually cannot be touched until age 55, rising to 57 from 6 April 2028. Cost: the three wrappers are often charged differently by the same platform.

Three accounts for the same investments

Most investment platforms let you hold the same underlying investments, shares, funds, bonds, inside an ISA, a SIPP or a Junior ISA, and every platform also offers an ordinary trading account with no special tax benefits, usually called a general investment account¹. The wrapper is the account, not the investment: a fund held in an ISA is the same fund as one held in a general account, and its price moves in exactly the same way. What differs is what the taxman sees.

The ISA family itself has four members. The Financial Ombudsman lists them as cash ISAs, stocks and shares ISAs, innovative finance ISAs and lifetime ISAs⁹, matching the four account types set out in the ISA regulations: a stocks and shares account, a cash account, an innovative finance account or a Lifetime ISA¹⁰. For investing in shares and funds, the stocks and shares ISA is the one that matters, and the rest of this page focuses on it. A SIPP is a personal pension you direct yourself, and a general investment account is a plain dealing account with no tax shelter at all.

Which wrapper suits which money is mostly a question of time horizon and tax position. Money you may need at short notice does not belong in a SIPP, because it cannot come out before pension age. Money you expect to hold for years generates gains and dividends that an ISA shelters completely. Money beyond the annual ISA allowance has to go somewhere, and for most people that somewhere is a general investment account, whose returns are taxed⁶. The sections below take each account in turn, then compare the tax, fees and access rules directly.

Stocks and shares ISA: up to £20,000 a year tax free

A stocks and shares ISA is a wrapper around investments, and its headline rule is the allowance: you can put in up to £20,000 each tax year, across all your adult ISAs combined, and the returns are free of UK income tax and capital gains tax⁴. You do not even have to declare the ISA on your tax return¹. The allowance is per person, not per account, and it is use-it-or-lose-it: money you do not subscribe by the end of the tax year on 5 April cannot be carried forward.

Since 6 April 2024 the multiple-account rules have been relaxed. You can now open and pay into more than one ISA of the same type in a tax year¹², so you could, for example, contribute to two stocks and shares ISAs with different providers, as long as the total across all of them stays within £20,000¹⁴. Before that date the rule was one cash ISA and one stocks and shares ISA per year, and some guidance still describes the old position, including an exception for ISAs opened only to receive inherited savings¹⁵. The current legislation is the one to rely on: it permits subscribing to more than one ISA of the same type in a tax year¹².

What can be held inside the wrapper is regulated. Only authorised or recognised funds may be held in a stocks and shares ISA under current law¹⁶, and shares, including investment trust shares, must generally be acquired via a public offer rather than before listing¹⁷. Uninvested cash waiting to be deployed is treated differently from the investments: interest on uninvested cash held in a stocks and shares ISA is subject to a flat rate charge representing tax at the basic rate¹⁸. The ISA shelters your returns, not the value of your money: the value of your investments can fall as well as rise, and you may get back less than you put in⁴.

ISAs are held by individuals, not couples. An ISA is opened using your national insurance number and cannot be held in joint names¹⁹, so a household's £20,000 allowances are one per adult. Transfers between providers are covered below, and the rules around moving money out of stocks and shares ISAs into cash ISAs are tightening from April 2027, which matters if you plan to de-risk in retirement.

SIPP: pension tax benefits, locked until pension age

A SIPP is a self-invested personal pension: a pension wrapper in which you choose the investments yourself, typically from a range of thousands of shares, exchange-traded funds and mutual funds on a platform²⁰. Its tax treatment is the mirror image of an ISA's. An ISA is tax free coming out; a pension is tax boosted going in. Contributions receive tax relief, at 20% for basic rate taxpayers, with provider documents describing relief of between 20% and 48% depending on the saver's marginal rate. The annual allowance is £60,000, or 100% of your earnings if you earn less than that. Employer contributions, if you have a workplace scheme, are extra money a SIPP cannot replace.

The trade-off is access. Money in a SIPP usually cannot be withdrawn until age 55, and that minimum age rises to 57 on 6 April 2028, after which it is expected to track ten years below state pension age. Money moved into a SIPP is therefore committed for the long term: if your circumstances change, it stays locked. Within the wrapper, returns roll up free of tax, as in an ISA, and the investments available are broadly the same universe of funds and shares.

Two warnings attach to pension-adjacent products. The FCA requires firms to tell clients that saving in a Lifetime ISA instead of enrolling in or contributing to a pension scheme may lose them the benefit of employer contributions, and that their entitlement to means-tested benefits may be affected²¹. That warning exists because a Lifetime ISA, the fourth ISA type, is sometimes marketed as a pension alternative for younger savers, and the comparison is not straightforward²³. The dedicated guides to pensions and to investing for children cover these routes in more detail.

General investment account: no limits, but returns are taxed

A general investment account is an ordinary dealing account: no subscription limit, no lock-in, no tax shelter. All platforms offer one alongside their ISA and SIPP¹, and it is where most people hold investments once their ISA allowance is used up. The account itself is simple; the tax return it can generate is not.

Returns in a general account are taxed in two ways. Dividends and interest count as income and are taxed according to your overall income and available allowances, and any income received from ISA investments, by contrast, is not taxed any further²⁴. When you sell an investment for more than you paid, the profit is a capital gain, and capital gains tax on shares applies to disposals in a general account⁶. The rules on allowances, rates and reporting are covered in the guide to how investments are taxed.

Because there is no limit on what you can hold, the general account is also the natural overflow valve and the staging post for Bed and ISA, the process for moving existing investments into your ISA described later in this page⁷. Its other practical role is for money you may want to get at without any wrapper rules at all: withdrawals are just sales, with no transfer paperwork and no effect on any allowance.

Tax compared: income, dividends and capital gains in each account

The core comparison is between the ISA and the general account, because the SIPP shares the ISA's tax-free roll-up inside the wrapper and differs mainly in what happens at each end. With an ISA, any returns you earn are free from UK income tax and capital gains tax⁴. Individuals do not pay tax on capital gains arising on disposals of ISA investments²⁵, and they are exempt from tax on any income, meaning dividends, interest and bonuses, or capital gains they receive from their ISA savings and investments²⁶. The underlying legislation puts it beyond argument: no tax is chargeable on the manager, the nominee or the investor in respect of interest, dividends, distributions or gains on account investments, and losses are disregarded for capital gains tax purposes²⁷.

In a general investment account, the same dividends and gains are taxable⁶. The difference compounds over years: a gain that would be invisible inside an ISA may cross the taxable threshold in a general account, and selling one holding to buy another, rebalancing, for instance, is itself a disposal that can trigger tax in a general account but not in an ISA²⁵.

Two edges of the ISA shelter are worth knowing. First, it does not cover everything: stocks and shares ISAs do not shield your investments from inheritance tax or from stamp duty when buying shares¹⁴. Second, cash inside a stocks and shares ISA is not fully sheltered either: interest on uninvested cash is subject to the basic-rate charge described above¹⁸, while money in a cash ISA is free from UK income tax and capital gains tax while it stays in ISAs³⁰. An ISA is a type of savings account where you do not have to pay tax on the interest or returns your savings earn³¹, but the wrapper's edges are real, and the guides to stamp duty on shares and capital gains tax on investments cover them in detail.

Fees and charges across ISAs, SIPPs and general accounts

The wrapper itself is often charged for, and the same platform can charge differently for each type of account. Platforms typically charge an account fee or platform fee, plus dealing charges when you buy or sell, plus the funds' own ongoing charges, and the structure of the account fee is what varies by wrapper². Interactive investor, for example, offers a general trading account, an ISA and a SIPP on a single low, flat fee³², while other platforms charge a percentage of the value held in each account.

The percentage-versus-flat distinction matters more as pots grow. Percentage-based fees are generally cheaper for smaller pots, and flat annual fees are often more cost-effective for larger pots over £50,000²⁰. Because a SIPP is usually the largest pot a person accumulates, its fee structure deserves particular attention: a percentage fee that looks trivial on a small ISA can cost more in pounds on a six-figure pension. The guide to investment platform fees and charges sets out the common structures, and dealing charges covers the cost of each trade.

Fees are also where Bed and ISA has a price: the process involves a sale and a purchase, so it can trigger two dealing charges plus stamp duty on the repurchase⁷. None of these costs are usually large per transaction, but they are the reason the move is worth doing in considered chunks rather than as a reflex. The wrapper's tax saving has to be weighed against the wrapper's fee, and for most people the ISA's tax saving dominates once the account is of any size, but the comparison is a matter of arithmetic, not of preference.

Getting money out: access rules and the rise to age 57

Access is where the three wrappers differ most sharply. For adult ISAs, individuals have the right to access their investment at any time and there are no statutory lock-in periods⁵. Withdrawing from a stocks and shares ISA means selling investments, which takes the usual settlement time, but there is no wrapper penalty and no age gate. Money taken out keeps its tax-free status; what you lose is the ability to put it back: withdrawals only restore allowance if the ISA is flexible, and the £20,000 subscription limit applies to new money going in each year⁴.

The SIPP is the opposite. Money in a SIPP usually cannot be withdrawn until age 55, and that minimum rises to 57 on 6 April 2028. From then on the minimum pension age is expected to track ten years below state pension age. This is a hard rule, not a provider policy, and it is the single biggest cost of pension tax relief: money that goes in cannot come out early, however much circumstances change.

The ISA rules around moving between ISA types are also tightening. From 6 April 2027, transfers from a stocks and shares ISA or an innovative finance ISA to a cash ISA will be prohibited where the account holder is below the age of 65³³, and the annual subscription limit for a cash ISA will be set at £12,000 for investors under 65, while remaining at £20,000 for those aged 65 and over³⁵. The overall annual limit of £20,000 is unchanged³⁶, and the Budget confirmed the £12,000 cash limit sits within it³⁷. The charge on interest earned on cash held in non-cash ISAs and the prohibition on wholly cash-like investments in a stocks and shares ISA will remain in place³⁶. For someone planning to shift a stocks and shares ISA into cash on retirement, the window for doing so without restriction narrows at 65, not at pension age.

Age limits apply at the other end of the ISA too. Account opening for ISAs has been harmonised at 18 years³⁸, with an exception allowing an investor under 18 with an existing cash ISA to continue enjoying its benefits³⁸. A Lifetime ISA is a special case: once opened, it is treated as such an account even after the investor reaches 50, though no further qualifying contributions can be made¹⁰.

Moving investments from a general account into an ISA with Bed and ISA

Investments cannot be transferred directly into an ISA. Instead, you can sell them, move the money to your ISA, and buy the investments back: a pair of deals known as a Bed and ISA⁶. The process lets you sell an asset in a general investment account and repurchase the same asset straight away in an ISA, a Junior ISA or a SIPP⁷.

The conditions and costs are practical ones:

• Allowance: you need some of your £20,000 annual ISA allowance left, or you must wait for the new tax year when it renews⁷.
• Provider: you need a stocks and shares ISA with the same provider as your general investment account⁷.
• Stamp duty: you pay 0.5% on the repurchase of shares, because an ISA does not shelter stamp duty on buying shares¹⁴.
• Repurchase timing: normally you cannot sell and then repurchase the same investment within 30 days⁷.
• Capital gains tax: the sale itself is a disposal, so a large embedded gain can trigger CGT, though for many people the annual exemption covers it⁶.

The 30-day repurchase restriction is the one that surprises people: it exists because selling and immediately rebuying the same holding can look like a tax manoeuvre rather than a genuine disposal, so providers space the two legs of the trade. The guide to whether you pay capital gains tax when selling investments to transfer them covers the sale leg in detail.

Risks, complaints and where to get help

The wrapper does not change the investment risk. The value of your investments can fall as well as rise, and you may get back less than you put in, whether they sit in an ISA, a SIPP or a general account⁴. An ISA is a tax wrapper, not a guarantee, and the guides to investment risk and what happens if a platform fails cover what protection exists and where it stops.

Complaints about ISA investments have their own route. The Financial Ombudsman handles complaints about stocks and shares held in an ISA through its dedicated consumer page on ISAs⁴¹, and its data shows the scale of the issues people raise. In the first quarter of 2026/27, 392 new complaints were opened about stocks and shares ISAs, alongside 620 about cash ISAs and 34 about investment-only Lifetime ISAs⁴². In the previous year's first quarter, the uphold rate for stocks and shares ISA complaints was 39%⁴³, and across 2024/25 the stocks and shares ISA was the most complained-about investment product, with 1,655 new complaints⁴⁴. The ombudsman's case studies show what goes wrong in practice: one complaint involved a customer who believed she had opened a Lifetime ISA online but had in fact opened a sub-account that was a standard general savings pot named 'LISA'⁴⁵. Checking what you have actually opened, and in which wrapper, is worth doing at the outset.

Two further warnings come from the rulebook. An Innovative Finance ISA does not reduce the risk of the underlying investment or protect you from losses, so you can still lose all your money; it only means any potential gains will be tax free⁴⁶. And firms must warn clients that saving in a Lifetime ISA instead of a pension may lose employer contributions and affect means-tested benefits²¹. If something has gone wrong, complain to the provider first, then to the Financial Ombudsman Service; the guides to mis-sold investments and investment scams cover the warning signs, and MoneyHelper offers free, impartial guidance on where you stand.