Innovative Finance ISA (IFISA): Peer-to-Peer Lending in a Tax Wrapper Explained 2026

The Innovative Finance ISA (IFISA) is the least well-known member of the ISA family, sitting alongside the familiar Cash ISA and Stocks and Shares ISA. It was introduced in April 2016 to allow savers to benefit from the higher interest rates offered by peer-to-peer (P2P) lending platforms while keeping returns sheltered from income tax.

In a world where basic-rate savings accounts have lagged behind inflation and P2P platforms advertise returns that can reach double digits, the IFISA offers an intriguing but higher-risk alternative. This guide explains how IFISAs work, who they suit, and what the risks are in 2026.

How the IFISA Fits Into the ISA Family

For 2026/27, you can subscribe up to £20,000 across all your ISAs. The ISA types and their limits are:

• Cash ISA: any amount up to the overall £20,000 limit
• Stocks and Shares ISA: any amount up to the overall £20,000 limit
• Innovative Finance ISA: any amount up to the overall £20,000 limit
• Lifetime ISA: up to £4,000 (counts towards the £20,000 overall limit)
• Junior ISA: separate limit (£9,000 for 2026/27, for children)

You can split the £20,000 across multiple ISA types — for example, £10,000 in a Cash ISA and £10,000 in an IFISA — but you can only subscribe to one IFISA per tax year. You can hold IFISAs from previous years open alongside a new subscription.

What Is Peer-to-Peer Lending?

Peer-to-peer lending is a form of debt-based crowdfunding where individuals lend money directly to borrowers — individuals, property developers or businesses — via an online platform. The platform matches lenders with borrowers, manages loan agreements and typically handles collections if a borrower defaults.

Borrowers pay interest at rates that reflect their credit risk. Lenders receive this interest, minus the platform's fee. The interest rates offered are generally higher than savings accounts precisely because the risk is higher: there is no deposit guarantee and borrower default can result in partial or total loss of capital.

P2P lending platforms that hold FCA authorisation can offer their products within an IFISA wrapper, meaning the interest is received tax-free by the lender.

Why Use an IFISA?

Tax on P2P Lending Outside an ISA

If you lend through a P2P platform outside an ISA, interest earned is added to your taxable income. Subject to your Personal Savings Allowance:

• Basic-rate taxpayers (income up to £50,270): £1,000 PSA — interest above this is taxed at 20%
• Higher-rate taxpayers (income £50,271 to £125,140): £500 PSA — interest above this is taxed at 40%
• Additional-rate taxpayers (income above £125,140): no PSA — all interest taxed at 45%

For a higher-rate taxpayer earning £5,000 gross from P2P lending, £4,500 is taxable at 40%, giving a tax bill of £1,800 and net interest of £3,200. The same lending within an IFISA yields the full £5,000.

ISA Shelter for Higher P2P Returns

The tax-sheltering benefit is proportionally more valuable as your marginal tax rate rises. An additional-rate taxpayer lending at 8% gross retains all 8% within an IFISA versus 4.4% net after 45% tax outside.

Types of Investment in an IFISA

Not all alternative finance products qualify for IFISA inclusion. HMRC sets out qualifying investments:

Qualifying IFISA investments include:

• Peer-to-peer loans (consumer, business and property)
• Debt-based crowdfunding (debentures, loan notes) where the IFISA provider holds appropriate FCA permissions
• Certain other FCA-regulated alternative finance instruments

Not qualifying for an IFISA:

• Equity crowdfunding (buying shares in start-ups — this falls under a Stocks and Shares ISA if the platform offers ISA eligibility)
• Cryptocurrency lending
• Invoice finance receivables not structured as qualifying P2P loans

Most platforms clearly state whether their products are IFISA-eligible.

Understanding IFISA Risks

The IFISA's higher potential returns come with substantially higher risk than a Cash ISA or even a diversified Stocks and Shares ISA. Understanding these risks is essential.

Credit Risk: Borrower Default

P2P lending means you are a creditor. If a borrower fails to repay, you lose some or all of the capital lent. Default rates vary significantly by platform and loan type:

• Consumer P2P loans typically carry higher default rates but smaller individual loan amounts
• Business P2P loans may offer higher returns but business failure risk is significant
• Property P2P loans are often secured against property, providing some recovery value in default, but property development projects can stall

Platforms often quote expected loss rates alongside gross yields. The net expected return after expected losses is the figure that matters, not the headline gross yield.

Platform Risk

If the P2P platform itself fails — due to fraud, insolvency or regulatory action — this creates additional risk beyond individual borrower default. Regulated platforms must have wind-down plans approved by the FCA, which set out how the loan book will be managed in an orderly rundown if the platform closes. However, a wind-down may take years and returns may be lower than expected.

The FSCS does not protect P2P lending losses. You may be protected for uninvested cash held by the platform in a segregated client account (up to £85,000), but not for capital deployed in loans.

Liquidity Risk

P2P loans are not as liquid as cash or listed investments. If you need your money back before loans mature, many platforms offer a secondary market where you can sell your loan parts to other investors. However, in stressed market conditions, secondary markets can freeze — as happened during 2020 — leaving investors unable to exit.

Provision Fund Risk

Many platforms operate a provision fund — a pool of capital set aside to cover expected defaults and protect lenders from bad debt. Provision funds are not guarantees; if defaults exceed the fund, lenders bear the residual loss. The size and adequacy of provision funds varies widely between platforms.

FCA Regulation and the 10% Restriction

Following a review of the P2P sector, the FCA introduced stricter rules in December 2019 that limit how platforms can market IFISAs to retail investors.

Unless an investor qualifies as a sophisticated investor or high-net-worth individual (by meeting specific income or asset thresholds), they must self-certify that they will invest no more than 10% of their net investible assets in P2P lending.

This restriction applies at the point of first investment with a platform. It is a self-certification requirement, not a hard cap enforced by the platform, but it reflects the FCA's view that P2P lending is not suitable as a core holding for most retail investors.

How to Open an IFISA

Step 1: Choose an FCA-authorised IFISA provider. Check the FCA register to confirm the platform holds the correct permissions. Major P2P platforms offering IFISAs include property-secured lending specialists and consumer lending platforms — the market changes, so current research is essential.

Step 2: Complete the appropriateness assessment. The platform will ask you questions about your understanding of P2P lending risks. This is required before you can invest.

Step 3: Complete the self-certification (if applicable). If you are not a sophisticated or high-net-worth investor, you will be asked to confirm the 10% net assets restriction.

Step 4: Subscribe within the annual allowance. Subscribe up to your remaining 2026/27 ISA allowance. Remember you can only subscribe to one IFISA per tax year.

Step 5: Deploy your funds. Depending on the platform, you may auto-invest across a range of loans or manually select loan types. Review the loan criteria, expected returns and default rates carefully.

Transferring Existing ISAs into an IFISA

You can transfer existing Cash ISA or Stocks and Shares ISA funds from previous years into an IFISA without using your current year allowance. Transfers must be done using the formal ISA transfer process — withdrawing and redepositing is treated as a new subscription and will count against your £20,000 limit.

Not all IFISA providers accept transfers in. Check before initiating a transfer.

Who Might Consider an IFISA?

An IFISA may be worth considering for:

• Investors who have already used their Cash ISA and Stocks and Shares ISA allowances and want to shelter further returns
• Higher and additional-rate taxpayers where the tax saving on P2P interest is most valuable
• Investors with a higher risk tolerance who understand that capital is at risk
• Investors who have read and understood the specific platform's risk disclosures

An IFISA is unlikely to be appropriate as your primary savings vehicle, as your emergency fund, or for money you cannot afford to lose.

The Bottom Line

The Innovative Finance ISA offers an attractive tax wrapper for peer-to-peer lending, sheltering returns that could otherwise face 40% or 45% income tax for higher-rate payers. Within the £20,000 annual ISA allowance, it sits alongside Cash and Stocks and Shares ISAs as a tax-efficient option for those prepared to accept the risks of P2P lending.

But those risks are real and meaningful. Capital is at risk, FSCS protection does not apply, liquidity can be limited and platform failures do occur. The IFISA is not an alternative to a savings account — it is a higher-risk investment product that happens to be available in a tax-efficient wrapper.

If you proceed, diversify across multiple loans and platforms, reinvest returns to compound your tax saving, and treat your IFISA allocation as part of a broader, diversified financial plan.