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Flexible Stocks and Shares ISA

Withdraw and reinvest without losing your allowance.

Prosper's Stocks and Shares ISA is fully flexible, so if life gets in the way, your allowance doesn't have to suffer for it. Invest up to £20,000 this tax year, and get it all back if you need it.

Investing involves risk. The value of investments may rise or fall and you may get back less than you put in.

What is a Flexible Stocks & Shares ISA?

Most people assume that once they take money out of an ISA, that portion of their annual allowance is gone. With a flexible ISA, that's not the case.

A flexible Stocks and Shares ISA lets you withdraw money and replace it within the same tax year, without it counting as a new subscription. In other words, you won't eat into your £20,000 annual allowance when you put the money back

Here's how it works in practice. Say you deposit £15,000 into your ISA in April. In August, you need £5,000 for an unexpected expense. You withdraw it. In November, things settle down and you put the £5,000 back in. With a flexible ISA, that replacement doesn't touch your remaining £5,000 allowance – you've still got it ready to use.

With a non-flexible ISA, that same withdrawal would cost you £5,000 of allowance permanently for that tax year.

Prosper's Stocks and Shares ISA is flexible. So you always stay in control.

Investing involves risk. ISA and tax rules apply.

Why choose a flexible ISA?

Access to your money when you need it

Life doesn't follow a tax year calendar. A flexible ISA means you don't have to choose between maintaining tax-free growth and having access to your money.

Withdraw for an unexpected bill, a short-term opportunity or anything else – then replace it later without penalty.

Maximise your £20,000 allowance

Your annual ISA allowance is one of the most valuable tools available to UK investors. Don't let a mid-year withdrawal reduce it.

With Prosper's flexible ISA, what you take out can come back in: same year, same allowance, same tax-free status.

Tax-free growth and withdrawals

Like all ISAs, your investments in a Prosper flexible Stocks and Shares ISA grow free from UK income tax and capital gains tax. Withdrawals are tax-free too.

The flexibility just means you can access that money without permanently sacrificing your allowance.

The value of investments may rise or fall.

How Prosper's flexible Stocks and Shares ISA works

Prosper checklist

Deposit up to £20,000 per tax year, starting from just £1.

Invest across 200+ funds and ETFs, including 30+ with fund manager fees fully refunded.

Withdraw anytime via the Prosper app.

Replace what you withdrew in the same tax year, without affecting your remaining allowance.

Pay nothing in platform, transfer, or exit fees — on any portfolio size.

Prosper tracks your flexible allowance automatically, so you always know exactly how much you can replace – without spreadsheets or guesswork.

Uninvested cash doesn't earn interest. Investing involves risk. ISA and tax rules apply.

Comparing flexible Stocks and Shares ISA providers

Not all Stocks and Shares ISAs are flexible, and the ones that are don't all charge the same. Here's how the major providers compare.

Comparison of UK ISA providers by flexible ISA availability and platform fee
Provider Flexible ISA? Platform fee
Prosper Yes 0%
Hargreaves Lansdown Yes 0.35%
AJ Bell No 0.25%
Vanguard No 0.15%
Interactive Investor Yes £5.99/month

Comparison correct as of June 2026. Platform fees and ISA features are set by each provider and may change. Figures sourced from each provider’s published pricing. Investing involves risk. If you are unsure about investing, please speak to an independent financial adviser before proceeding.

Prosper is the only provider on this list that combines ISA flexibility with zero platform fees, plus fund fee refunds on 30+ funds and ETFs from the likes of BlackRock, Vanguard, and Fidelity.

Flexible Stocks and Shares ISA rules

Replacements must happen in the same tax year.

If you withdraw in March and the tax year ends before you replace the funds, that portion of your allowance is gone.

The £20,000 limit applies to new subscriptions.

Your total deposits (original + replacements) can exceed £20,000 in a single year — but only because replacements don't count as new money. You can't add more than £20,000 in fresh contributions.

Not all providers support flexibility.

If you transfer your ISA away from Prosper, check whether the new provider offers a flexible ISA. If they don't, you lose this benefit.

Prosper tracks it for you.

Your flexible ISA balance — including how much you can still replace — is visible in your account at all times.

Investing involves risk and reward. ISA and tax rules apply.

Flexible ISA vs non-flexible ISA

Still weighing it up? Here's the key difference at a glance.

Comparison of flexible and non-flexible ISA features
Feature Flexible ISA Non-flexible ISA
Withdraw and replace funds? Yes (same tax year) No
Lose allowance on withdrawal? No Yes
Annual limit £20,000 £20,000
Tax treatment Tax-free growth and withdrawals Tax-free growth and withdrawals
Best for Access + tax efficiency Long-term investing

Based on ISA rules for the 2026/27 tax year. The £20,000 allowance applies across all ISA types combined and may change in future years. This is general information, not financial advice. For personalised guidance, consult an FCA-authorised adviser.

If you value control and want the safety net of being able to access your money without a permanent cost to your allowance, a flexible ISA is the smarter choice.

Who should choose a flexible Stocks and Shares ISA?

A flexible Stocks and Shares ISA makes sense if you:

Want to make the most of your £20,000 allowance, even in years when your finances aren't perfectly predictable.

Simply want the peace of mind that comes with knowing your money is accessible without sacrificing tax efficiency.

If you invest and never touch it, you probably won't notice the difference between flexible and non-flexible. But the day you need to, you'll be glad you chose Prosper.

Open or transfer your flexible Stocks and Shares ISA

Already have a Stocks and Shares ISA elsewhere? Transfer it to Prosper for free.

We'll handle the paperwork and you'll benefit from zero platform fees, zero transfer fees and fund fee refunds from day one.

Or start fresh. Open an account in minutes from £1 and put your £20,000 allowance to work.

Capital at risk. ISA and tax rules apply. Uninvested cash doesn't earn interest.