Gareth Hoyle · Founder & Editor
Reviewed May 2026. Independent researcher, not a financial adviser. About Gareth
Neither is FSCS-protected against investment loss, and both put your capital at risk. The difference is the type of risk: a peer-to-peer ISA earns interest from loans (the risk is borrower default and platform failure), while a stocks & shares ISA earns from market growth and dividends (the risk is market volatility).
| Peer to peer ISA | Stocks & shares ISA | |
|---|---|---|
| Return comes from | Interest on loans | Market growth & dividends |
| Main risk | Defaults & platform failure | Markets falling in value |
| Volatility | Low day-to-day, but binary loss risk | Can swing up and down daily |
| Time horizon | Often fixed loan terms | Best over 5+ years |
| Liquidity | Can be limited | Usually sell anytime (price varies) |
| Diversification | Across many loans | Across funds, shares, regions |
Lean towards peer to peer if…
- · You want a steadier income-style return
- · You're comfortable with credit/default risk
- · You can commit money for fixed terms
Lean towards stocks & shares if…
- · You're investing for 5+ years
- · You can ride out market ups and downs
- · You want broad diversification and liquidity
The honest take
Over long horizons, a diversified stocks & shares ISA is the mainstream choice and is far more liquid. A peer-to-peer ISA is a more niche, income-focused play that some use to diversify a small portion of a portfolio, not usually a core holding.
Where to look
See our P2P provider comparison. For stocks & shares ISAs, popular platforms include Fidelity, Hargreaves Lansdown, Trading 212, InvestEngine and IG. Compare fees, fund choice and any transfer offers before committing.
Keep reading
Compare providers
Independent side-by-side comparison of UK IFISA providers: target rates, minimums, security and transfers.
Returns calculator
Illustrate how cash, stocks & shares and peer-to-peer ISA returns could differ over time. Illustrative only.
Types of ISA explained
The five main types of ISA, how each works, who they suit and how they compare.
Cash ISA vs S&S ISA
The classic decision: guaranteed-rate savings vs investing for growth. How to choose, and why not both.