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ISA rules are changing. Here’s what you need to know.

As part of the 2025 Autumn Budget, the total ISA allowance remains at £20,000, but from April 2026, a new cap limits Cash ISAs to £12,000.

This means that to make full use of your allowance, at least £8,000 must now go into a Stocks & Shares ISA.

The good news? Nothing is lost. The shift is simply toward investments.

Over 65? You’re exempt. Your full £20,000 Cash ISA allowance remains.

Prosper is here to help you make most of your Stocks & Shares ISA with zero platform, transfer, or exit fees. We even go the extra mile to refund fund fees on 30+ leading ETFs from the likes of BlackRock, Vanguard, and Fidelity. Uninvested cash doesn’t earn interest.

Capital at risk. Investments can go down as well as up.

NEW MEMBER OFFER

Get up to £3,000 cashback

Enjoy £50 to £3,000 cashback when you invest £5,000+ in a Prosper Stocks and Shares ISA, Personal Pension and/or General Investment Account by 30 June 2026.

Investing involves risk and reward. Minimum holding period of 24 months from 30 June 2026.

Terms and Conditions apply.

Three steps to your cashback

No forms, no fuss. Opt in via your Prosper app and invest before 30 June 2026.

01

Opt in to the offer

Go to your Profile in the Prosper app and opt in to our cashback offer. This confirms you accept the offer Terms and Conditions.

Open and fund your account

Open a Stocks and Shares ISA, Personal Pension and/or General Investment Account and deposit or transfer £5,000+ before 30 June 2026.

Get your cashback

Depending on your invested amount, we’ll pay up to £3,000 into your Prosper wallet by 15 July 2026, as long as the qualifying amount remains invested for 24 months from 30 June 2026.

How much you could earn

The more you invest, the more cashback you receive. Paid once by 15 July 2026.

Three ways to invest

Use one or combine them all to unlock a higher cashback tier.

Stocks and Shares ISA

Tax-free investing up to £20,000 per tax year. Flexible access to your money.

SEE STOCKS AND SHARES ISA
 

Personal Pension (SIPP)

Tax-efficient retirement investing. Access from age 55 (57 from 2028).

SEE SIPP
 

General Investment Account

No contribution limits. Tax may apply on gains and dividends.

SEE GENERAL INVESTMENT ACCOUNT
 

Investing involves risk and reward.

Prosper uses SECCL as the custodian to hold your investment assets which is regulated by the FCA and wholly owned by Octopus Group

Prosper is authorised and regulated by the Financial Conduct Authority under registration number 991710

Why your investments could grow faster with Prosper

No platform fees. No transfer fees. No exit fees. Refunded fund fees on 30+ top funds.

Investing involves risk and reward. The value of investments may rise or fall. Uninvested cash doesn’t earn interest.

Based on a one-time £85,000 investment. Cash grows at 2.20% AER; investments growat 8% per year with returns compounded annually. One scenario includes a 0.45% annualfee. These figures are illustrative and assume no additional contributions. Actual returnsmay vary.

Don't take our word for it

As featured in

FAQs

How do I opt in for cashback?

Tap the opt-in button in the Profile section of the Prosper app. By opting in, you're accepting the offer Terms and Conditions. You'll then need to open and fund any number of eligible investment accounts by 30 June 2026 to qualify for cashback.

Can I claim cashback more than once?

No, cashback is awarded once per member, based on the qualifying investment account or accounts you open and fund during the offer window.

Does my existing Prosper savings account count?

No, the offer applies to investment accounts only – Stocks & Shares ISA, Personal Pension and/or GIA. Cash savings accounts (including Cash ISA and fixed-term savings held with Prosper) do not qualify. The idea behind the offer is to encourage you to put money to work in investments rather than leaving it in cash.

Can I use money I'm transferring from another provider?

Yes, you can fund with new money or transfer in from an existing investment account held elsewhere. If you're transferring a pension, make sure to check for exit fees, lost benefits, employer contributions and compare charges before proceeding.

When will I receive my cashback?

Cashback will be paid into your Prosper wallet by 15 July 2026, following the close of the qualification window on 30 June 2026. You don't need to do anything – it will be applied automatically once your eligibility has been verified.

To keep your cashback, you must maintain at least the original qualifying investment amount in your Prosper investment account for 24 months from 30 June 2026

Will my cashback be paid into my investment account?

No, cashback is paid into your Prosper wallet. You can choose to invest it from your wallet once received.

What is the 24-month holding requirement?

To keep your cashback, you must maintain at least the original qualifying investment amount in your Prosper investment account for 24 months from 30 June 2026. If you withdraw money that brings your balance below that original amount before the 24 months are up, Prosper reserves the right to recover the cashback in full.

Ready to claim your cashback?

Opt in and open your Prosper account in minutes. Invest before 30 June 2026.

Investing involves risk and reward. The value of investments may rise or fall.