Peer-to-Peer Lending in ISAs: Risks in the UK

The Allure of Tax-Free Returns – Why So Many UK Taxpayers Are Drawn to IFISAs in 2026

Picture this: you’re a busy business owner in Manchester or a higher-rate taxpayer in London staring at your self-assessment, wondering how to shelter more of your hard-earned interest from HMRC. For the 2025/26 tax year the £20,000 ISA allowance remains unchanged, and the Innovative Finance ISA (IFISA) lets you put the whole lot into peer-to-peer (P2P) lending while keeping every penny of interest and any capital growth completely tax-free. No personal savings allowance to worry about, no 20%, 40% or even 45% income tax, and no capital gains tax either. It sounds almost too good – and that’s exactly where the first red flag appears.

I’ve advised clients for over 18 years, and I can tell you the IFISA wrapper is genuinely powerful. Yet the moment you wrap high-risk P2P loans inside it, you lose certain protections you would have outside. That trade-off is rarely spelled out on the glossy platform websites you see when searching “P2P lending ISA risks UK”.

Borrower Default Risk – The One That Actually Costs You Money

The single biggest risk remains the borrower failing to repay. FCA-authorised platforms publish average default rates, but real-life experience shows they can spike in economic downturns. Even with provision funds and security (property-backed loans are popular), recoveries are never 100%. In an ordinary taxable P2P account you can claim bad-debt relief by offsetting irrecoverable loans against other P2P interest received – HMRC’s own guidance on the SA101 notes makes this crystal clear. Inside an IFISA that relief disappears because there is no taxable interest to offset against.

I had a client in 2023 – let’s call him David, a company director with two rental properties – who put £15,000 into a well-known IFISA. Two property-development loans defaulted in 2024. Outside the ISA he could have clawed back roughly £1,200 in tax relief at his 40% rate. Inside the wrapper the losses simply vanished from his tax return, and he had no offset. The capital was gone for good. That’s the hidden cost nobody shouts about.

Why the Absence of FSCS Protection Matters More Than Most Realise

Every reputable article mentions this, yet few explain the practical consequence for ISA investors. P2P loans themselves are not covered by the Financial Services Compensation Scheme – not even when held in an IFISA. Only cash sitting unlent on the platform might qualify for the £85,000 protection if the platform is also a deposit-taker. Most aren’t.

Compare that with a cash ISA or even a stocks-and-shares ISA holding money-market funds. The FSCS safety net is there. With P2P it isn’t. In my practice I now insist every client reads the platform’s wind-down plan (required by the FCA since 2019) before committing a single pound. If the platform fails, your loans don’t disappear overnight, but you could be waiting years for repayments while administrators sort out the mess – all inside your tax-free wrapper.

Liquidity Risk and the “Money Locked Away” Problem

P2P lending is not like selling shares on the stock market. Many loans run for three to five years. Secondary markets exist on some platforms, but in 2025/26 they remain thin and often trade at a discount. Need the cash quickly for your business or a house deposit? You may have to accept a loss or wait.

The IFISA rules add another layer. You cannot simply sell a loan held outside the ISA and repurchase the identical loan inside the wrapper. GOV.UK guidance on innovative finance ISA investments for ISA managers is explicit: secondary-market purchases must be at the same price, openly available to any prospective buyer. Many clients assume they can shuffle loans in and out for tax reasons – they can’t.

The Regulatory and Qualification Trap – When an IFISA Stops Being an ISA

This is the risk that keeps me awake at night when signing off client portfolios. For a loan to stay inside the IFISA it must meet strict conditions: the platform must hold the correct FCA permissions (Article 36H and 39G), the loan must be entered on genuine commercial terms, and you must not be connected to the borrower. If HMRC ever decides the investment no longer qualifies, the ISA manager has just 30 days to sell or transfer it out – or the whole thing risks becoming a “void ISA” with backdated tax charges.

I’ve never seen an entire IFISA voided in 18 years, but I have seen individual loans removed after a platform restructured its agreements. The client then faced an unexpected tax bill on the interest that had previously been sheltered. Always check the platform’s latest HMRC approval status yourself via GOV.UK before the 6 April subscription.

Platform Insolvency in Practice – Real Stories from the Last Decade

The FCA’s post-2019 rules tightened things considerably, yet history still matters. Platforms such as Lendy and Funding Secure ran into serious difficulties; investors waited years for partial recoveries. Had those loans been inside IFISAs, the tax-free status would have remained – but the capital losses would have been locked in with no ability to offset elsewhere.

In one case I handled, a client had £40,000 across two platforms. One entered administration. The loans continued to be administered, interest trickled in slowly, but the client could not access the capital when his business needed it for expansion. The IFISA wrapper protected the tax position but offered zero help with liquidity or capital preservation.

How Business Owners and Multi-Income Taxpayers Are Uniquely Exposed

If you run a limited company or have income from employment, dividends and property, the temptation is to use your personal IFISA allowance to shelter “spare” cash. That’s fine – but remember the £20,000 is shared across all ISAs. Many directors I advise forget they already used part of the allowance in a stocks-and-shares ISA for their pension contributions or share schemes.

Higher-rate taxpayers lose the most when defaults occur inside the wrapper: the forgone bad-debt relief at 40% or 45% stings. Scottish taxpayers face the same income-tax rates on non-ISA P2P interest as the rest of the UK for savings, so the IFISA benefit is identical north or south of the border. Welsh and Northern Irish residents follow the same pattern.

A Quick Risk Snapshot Table for 2025/26

Platform and Regulatory Risks – The Silent Killers in 2026

Let’s move on to the risks that sit one layer deeper – the ones that don’t make the headline bullet points but have quietly cost my clients tens of thousands over the years.

What Really Happens When a Platform Fails

Since the FCA forced wind-down plans on all loan-based crowdfunding platforms, the process is more orderly than pre-2019. Yet “orderly” does not mean fast. In practice the administrator steps in, continues collecting loan repayments, and eventually distributes proceeds. If your loans sit inside an IFISA the tax-free status survives – but you cannot touch the money or switch platforms without triggering potential ISA breaches.

I advised one client whose platform entered special administration in late 2024. The IFISA manager confirmed the loans remained qualifying investments, so no immediate tax hit. However, the client needed £25,000 for a business opportunity and had to borrow commercially at 8% while his P2P capital was frozen. The tax shelter looked brilliant on paper; the cash-flow pain was real.

The 10% Investment Limit for Unadvised Investors

Since 2019 the FCA has restricted new P2P investors without regulated advice to no more than 10% of their “investable assets”. Many high-earning business owners assume their IFISA is automatically “advised” because they spoke to the platform. It isn’t. If you exceed the limit without proper advice, the platform should have stopped you investing – but some still slip through. HMRC doesn’t police this, but the FCA does, and a breach can lead to forced sales and potential complaints.

Liquidity and Secondary Market Realities in Today’s Market

Secondary markets have improved slightly since 2024, but discounts remain common on longer-dated or higher-risk loans. In an IFISA you cannot simply sell at a loss and buy something else inside the wrapper without using fresh subscriptions – you are limited by the annual allowance. Many clients underestimate how long they may be locked in when they allocate their full £20,000.

Regulatory Changes on the Horizon – Even If Not for 2025/26

The rules for pure P2P lending inside IFISAs are stable right now. However, from April 2027 the cash ISA allowance drops to £12,000 for under-65s, and HMRC will start taxing interest on cash held inside stocks-and-shares or innovative finance ISAs. Smart business owners are already shifting away from holding large unlent cash balances in IFISAs to avoid future tax leakage. The message is clear: use the IFISA for genuine lending, not as a parking space.

The Qualification and “Void ISA” Risk – The One That Scares Accountants

GOV.UK guidance could not be clearer: if a loan ceases to meet the Article 36H criteria or is deemed part of a tax-avoidance scheme, the ISA manager must act within 30 days. In extreme cases the entire ISA subscription for that year can be treated as never having been an ISA. Back tax plus interest follows.

In 18 years I have seen only one near-miss where a platform changed its loan agreements mid-term and HMRC queried the qualifying status. The client moved the loans out in time, but the stress and professional fees were considerable. Always insist your platform publishes its latest HMRC confirmation letter.

Tax Reporting Pitfalls Even Inside the Wrapper

Platforms send annual tax certificates to both you and HMRC. If they report a figure incorrectly – perhaps interest paid in advance or a fee rebate misclassified – you could face an enquiry. Because the amounts are tax-free you might ignore it, but HMRC can still ask questions about the source of funds or connected-party rules. I now recommend every client keeps screenshots of the platform’s confirmation that the loans were qualifying at the point of investment.

High-Income Child Benefit Charge and Other Interactions

Many business owners with children assume the IFISA is invisible to the high-income child benefit charge. It is – because there is no taxable income. That’s a genuine advantage. However, if you later withdraw and the ISA is deemed void, the sudden taxable income could trigger a repayment of child benefit for the whole year. Rare, but I have seen it happen with other ISA types when errors occurred.

Practical Checklist: Before You Invest a Single Pound in an IFISA in 2026

1. Confirm the platform holds current Article 36H and 39G permissions – check the FCA register yourself.
2. Read the latest wind-down plan and understand recovery timelines.
3. Calculate your 10% investable-asset limit if you have not received regulated advice.
4. Diversify across at least three different loan types or sectors.
5. Keep platform statements showing the loans were qualifying when funded.
6. Review secondary-market liquidity data for the last 12 months.
7. Discuss with your accountant how a capital loss would affect your overall tax position (spoiler: it won’t inside the ISA).
8. Stress-test your cash-flow – can you survive without this money for five years?
9. Check whether the platform offers automatic bad-debt provisioning that actually works in practice.
10. Confirm you are not connected to any borrower.

Two Real-Life Case Studies from My Practice (Names Changed)

First, Sarah, a Scottish GP with £120,000 investable assets. She invested £20,000 in an IFISA in 2022. Two loans defaulted; the platform recovered 65%. Outside the wrapper she could have offset the loss and saved £1,400 in tax. Inside, the net return dropped from the advertised 6.8% to under 3%. The tax shelter helped, but the absolute loss still hurt.

Second, Michael, a London company director who used his IFISA for property-development loans. When the platform hit regulatory problems in 2024, the loans continued but secondary-market bids dried up. He needed funds for his business expansion and ended up remortgaging his house at higher cost. The IFISA protected the tax position perfectly – it just couldn’t protect his liquidity.

Moving Forward – What Smart Taxpayers Are Doing Differently in 2026

The key insight after nearly two decades advising clients is this: an IFISA turns P2P lending from a taxable high-risk investment into a tax-free high-risk investment. The risk level does not drop; the reward simply increases because the tax drag disappears. That makes it attractive for higher-rate taxpayers and business owners with surplus cash they genuinely do not need for five-plus years.

Yet the moment you treat the IFISA as “safe” because it is tax-free, you have made the classic mistake I see year after year. Capital is at risk. Always.