Comparing your options: what it means to have a stocks and shares ISA managed for you

What survived is the tax on savings interest held outside an ISA. From 6 April 2027 it rises by 4%: 24% for basic-rate taxpayers, 44% for higher-rate and 49% for additional-rate.

So nobody is being pushed into investing. But the gap between sheltered and unsheltered savings is widening, which makes the ISA wrapper worth more than it was. For anyone now weighing a stocks and shares ISA, there is a second question underneath the first: how much of the work do you actually want to do yourself?

What the Budget changed, and what it didn't

Three proposals were dropped. The £12,000 cash ISA cap for under-65s will not happen. Neither will the plan to tax cash held inside stocks and shares ISAs, nor the restriction on transferring from a non-cash ISA back into cash.

One thing got worse for savers outside the wrapper. The rise in savings income tax was already due to 2% from April 2027; the Budget doubled it to 4%. It applies to interest above your Personal Savings Allowance, which is unchanged at £1,000 for basic-rate taxpayers, £500 for higher-rate and nothing for additional-rate.

A “Starter ISA” aimed at first-time investors was also announced, though the detail is still being worked out with the industry. Separately, the Lifetime ISA withdrawal charge for buying a home above the £450,000 cap fell from 25% to 20% on 29 October 2026.

The general rules on how ISAs work are set out on GOV.UK, and the £20,000 can still be split across ISA types however you like.

Why this is a comparison, not a compulsion

You can still put the whole £20,000 into cash and nothing into the market. That option was never removed, and for money you might need within a few years it is often the sensible one.

What has changed is the cost of holding savings outside an ISA, and that makes the choice inside the wrapper worth thinking about properly rather than by default. If some of that money has a long horizon, the question becomes how a stocks and shares ISA would actually be run.

Three ways to run a stocks and shares ISA

Do it yourself

You choose the platform, pick the funds or shares, and decide when to buy, sell or rebalance. Platform charges are usually the lowest of the three routes. The trade-off is time and judgement: nobody is checking whether your holdings have drifted from what you intended, and nobody stops you selling at the worst moment.

Have it managed for you

Here you answer questions about your goals, your timeframe and how much short-term loss you could tolerate, and a portfolio is built and maintained around those answers. Having a stocks and shares ISA managed on your behalf means rebalancing, dividend reinvestment and day-to-day admin happen without you logging in. You still own the ISA and can usually withdraw, but you aren't the one picking individual holdings.

This is not the same as advice. A managed service builds a portfolio to match the risk level you selected; it does not assess whether investing is right for your wider circumstances.

Pay for regulated advice

A regulated adviser looks at your wider position and makes a personal recommendation. It costs the most, and it is the only route where someone is formally responsible for whether that recommendation suits you. You can check a firm is authorised on the FCA register before handing over any money.

What “managed” does not cover

Managed means someone handles the investment decisions. It does not mean the value can't fall. Markets move, and a managed portfolio moves with them.

It also doesn't decide how much you should save, when you'll need the money, or whether an ISA is the right wrapper for your situation. Those questions stay with you.

Costs are the part worth checking

Managed services usually charge in two layers: a management fee, plus the cost of the underlying funds. Both are percentages, both are taken whether the portfolio rises or falls, and only the combined figure tells you anything useful. Ask for the total, not the headline rate.

The gap looks small annually and large eventually. On a £20,000 portfolio, a total cost of 0.5% takes £100 in the first year and 1.2% takes £240 — a difference of £140. Left for 20 years at the same 5% assumed growth, the first ends up around £48,200 and the second around £42,200. That £140-a-year difference has become roughly £6,000.

Those figures are illustrative, not a forecast. Running your own contributions through a compound interest calculator with two different fee assumptions is the quickest way to see what the spread means for your numbers.

Moving an existing ISA without losing the wrapper

If you already hold an ISA elsewhere, you don't need to cash it in to switch. Ask the new provider to arrange the transfer and the money keeps its tax-free status throughout.

Withdrawing it yourself is the expensive mistake. Money taken out stops being ISA money, and paying it back in counts against your annual allowance again.

Cash ISA transfers should complete within 15 business days and other types within 30 calendar days. Partial transfers are generally allowed, but providers aren't obliged to accept them, so check before you commit.

What protection you actually have

If an authorised firm fails, the Financial Services Compensation Scheme covers eligible investment claims up to £85,000 per person per firm. Deposits held with a bank or building society are covered separately, up to £120,000 since December 2025.

The distinction that catches people out: FSCS cover applies if the firm fails, not if your investments lose value. Falls in the market are not compensated, however the ISA is run.

Questions worth asking before you choose

• What is the total annual cost, including underlying fund charges?
• How often is the portfolio rebalanced, and who decides?
• Can I transfer an existing ISA in, and will it be sold to cash on the way?
• Are there exit fees, and how long does a withdrawal take to reach my bank?
• Is the firm FCA authorised, and is it covered by the FSCS?
• Can I change risk level later without closing the account?

Where it fits in a longer plan

For anyone considering stopping work before pension age, a stocks and shares ISA often does one specific job: covering the years between finishing work and being able to draw a pension. Saving Tool UK's ISA bridging calculator gives a rough sense of whether a balance is on track for that.

The route you pick matters less than being clear about what the money is for. A managed ISA suits people who want to invest but don't want the ongoing decisions. Doing it yourself suits people who want control and will keep reviewing it. Advice suits people whose situation has moving parts. None is better in the abstract.

The bottom line

The U-turn removed a deadline, not a decision. Cash keeps its full £20,000 allowance, so there is no rush — but with savings tax rising in April 2027, it is worth knowing what you would do with the wrapper rather than defaulting into it. If part of the answer is investing, the next question is how involved you want to be, and the costs that come with each answer.

This article is for information only and is not financial advice. The figures used are illustrative examples, not forecasts or recommendations. Investments can fall as well as rise and you may get back less than you put in. Tax rules and allowances can change. Consider speaking to a regulated financial adviser about your own circumstances.