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P2P Lending Tax Guide for UK Investors 2026

How HMRC taxes P2P lending interest in 2026: IFISA £20,000 allowance, self-assessment rules, bad debt relief, and EU platforms. Not tax advice.

By Daniel Brenner, Senior Editor · Updated 2026-05-19

P2P Lending Tax Guide for UK Investors 2026

A plain-language walkthrough of how HMRC taxes peer-to-peer lending interest in 2026 — covering the standard taxable route, the Innovative Finance ISA wrapper, self-assessment reporting, bad debt relief, and the extra steps that apply when you invest through EU-domiciled platforms.

⚠️ Not tax advice. This article provides general information about UK P2P tax treatment as of 2026. It is not personalised tax or legal advice. Tax laws change, allowances are reviewed annually, and your individual circumstances will determine how the rules apply to you. Always consult a qualified UK tax adviser or accountant before acting on anything in this guide. All specific rates, thresholds, and deadlines should be confirmed against the current HMRC guidance at gov.uk before you rely on them.

TL;DR

  • P2P interest is taxable in the UK as savings income, reported through self-assessment.
  • The Innovative Finance ISA (IFISA) lets you hold qualifying P2P loans inside an ISA wrapper — interest is tax-free up to your annual ISA allowance of £20,000, shared across all your ISA types.
  • Self-assessment is required if your P2P interest (combined with other untaxed income) takes you above the relevant reporting thresholds. Register by 5 October following the tax year, file by 31 January.
  • Bad debt reliefis available — you can offset irrecoverable P2P loan losses against P2P interest in the same tax year, with carry-forward of unused losses for up to four years .
  • EU platforms (Mintos, Maclear, EstateGuru, etc.) are not UK-domiciled and are not eligible for IFISA. Interest from them is foreign-source income, reported separately, and may involve foreign tax credit relief.

📊 CrowdIndex Editor’s Pick: Maclear is our #1 rated European P2P platform (Score 9.2/10). Note: EU-domiciled platforms like Maclear may have different tax treatment for UK residents than UK-domiciled platforms — they cannot be wrapped in an IFISA, and interest is reported as foreign-source income. Always consult a UK tax adviser before assuming any specific treatment applies to your situation.

1. How UK P2P Interest is Taxed

In the UK, the interest you earn from peer-to-peer lending is treated by HMRC (His Majesty’s Revenue and Customs — the UK tax authority) as savings income. That puts it in the same broad category as bank interest, building society interest, and most bond coupon payments — but with a few P2P-specific rules layered on top.

What this means in practice:

  • Interest is taxed at your marginal income tax rate.Basic-rate taxpayers pay 20%, higher-rate 40%, and additional-rate 45% . The rate that applies is determined by your total taxable income for the year, not by the P2P interest alone.
  • The Personal Savings Allowance (PSA)gives most taxpayers a tax-free band on savings income before any tax is due. Basic-rate taxpayers typically get the first £1,000 of savings interest tax-free, higher-rate taxpayers get the first £500, and additional-rate taxpayers get £0 . P2P interest counts toward this allowance.
  • Interest is taxed when it is paid or credited to you, not when the underlying loan is originated. If you reinvest interest automatically through a platform’s AutoInvest feature, it is still taxable in the year it was credited — even if you never withdrew it to your bank account.
  • No automatic tax deduction at source. Unlike employment income (which is taxed through PAYE), P2P platforms do not deduct UK tax before paying interest. You are responsible for declaring it yourself.

The combination of those four points produces the headline reporting obligation: if your total savings interest (P2P plus bank plus any other untaxed savings income) exceeds your Personal Savings Allowance, you owe tax on the excess, and HMRC expects you to declare it through self-assessment.

There is one important exception to this whole structure: interest earned inside an Innovative Finance ISA. That is the next section.

2. The Innovative Finance ISA (IFISA) — Tax-Free P2P Investing

The Innovative Finance ISA, usually abbreviated IFISA, is the UK tax wrapper purpose-built for peer-to-peer lending. It was introduced in April 2016 to put P2P loans on the same tax-free footing as cash savings and stocks-and-shares investments held inside an ISA. Interest earned on qualifying P2P loans held inside an IFISA is free of UK income tax — no Personal Savings Allowance calculation, no self-assessment line item for that interest, no liability to HMRC on the income itself.

Key eligibility and limits:

  • The annual ISA allowance is £20,000for the 2025/26 tax year , and it isshared across all your ISA types. If you put £15,000 into a stocks-and-shares ISA in the same year, you can only put £5,000 into your IFISA before hitting the cap.
  • The platform must be FCA-authorised as an ISA manager. Not every UK P2P platform offers an IFISA wrapper — the platform itself has to be approved by HMRC as an authorised ISA manager, on top of being FCA-authorised as a peer-to-peer lender. Always check on the platform’s own disclosure page that they hold both authorisations before assuming IFISA eligibility.
  • You must be a UK resident for tax purposes to open and contribute to an IFISA. Non-residents cannot contribute, and if you leave the UK partway through a tax year, the rules tighten.
  • Only one IFISA per tax year for contributions.You can hold IFISAs from previous tax years across multiple providers, but in any given tax year you can only make new contributions to a single IFISA. (Rules have been adjusted in recent years — on the latest ISA flexibility rules at the time of investment.)
  • Transfers in from existing ISAs do not count against your annual allowance. You can transfer funds from an existing cash ISA, stocks-and-shares ISA, or another IFISA into a new IFISA without affecting your fresh £20,000 contribution limit for the year — provided you follow the formal ISA transfer process via the receiving provider.

What is NOT IFISA-eligible:

  • EU-domiciled P2P platforms. No European platform regulated under MiFID II Investment Firm rules, ECSP authorisation, or Swiss SRO can be held inside a UK IFISA — they are not on the FCA’s ISA manager register. This includes CrowdIndex-Mintos (Latvian MiFID II IF), Maclear (Swiss PolyReg SRO), CrowdIndex-EstateGuru (Estonian ECSP), CrowdIndex-Capitalia (Latvian ECSP), CrowdIndex-InRento (Lithuanian ECSP), and every other platform we cover at CrowdIndex.
  • Crowdfunding equity and unsecured high-risk products that fall outside HMRC’s definition of qualifying P2P agreements or ISA-eligible debt-based securities.
  • Loans originated outside the FCA perimeter, even if marketed in the UK.

In practice this means: for UK investors who want tax-free P2P income, the IFISA route is restricted to UK-domiciled, FCA-authorised platforms — a much smaller universe than the EU platforms covered on CrowdIndex. The trade-off is real: better tax treatment versus broader platform choice, higher yields, and the regulatory variety covered in P2P-Regulation-Explained.

3. Self-Assessment Reporting Requirements

If your P2P interest is not sheltered inside an IFISA, you almost certainly need to report it through self-assessment. Here is how that works in practice.

When self-assessment is required:

You generally need to register for self-assessment and file a return if anyof the following apply :

  • Your total untaxed savings and investment income (including P2P interest) exceeds your Personal Savings Allowance for the year.
  • You receive any foreign income, including interest from EU P2P platforms — even a few euros.
  • You have other reasons to file a return (self-employment income, rental income, capital gains above the annual exempt amount, total income above the higher-rate threshold, etc.).
  • HMRC has previously asked you to file a return.

If you are unsure whether you need to file, HMRC publishes a self-check tool on gov.uk. When in doubt, register — penalties for failing to register and file are higher than the cost of filing an unnecessary nil return.

The key deadlines:

  • Register for self-assessment by 5 Octoberfollowing the end of the tax year in which you first need to file . (UK tax years run 6 April to 5 April.)
  • File your online self-assessment return by 31 Januaryfollowing the end of the tax year . So for tax year 2025/26 (ending 5 April 2026), the online filing deadline is 31 January 2027.
  • Pay any tax due by 31 Januaryas well . Late filing penalties start at £100 and escalate; late payment interest accrues daily.

What to report:

For each P2P platform you use during the tax year, you will need:

  • The total gross interest received or credited during the tax year — even reinvested amounts that never left the platform.
  • Any bad debt losses you intend to claim relief for (covered in the next section).
  • For EU platforms: the gross interest in the original currency, the GBP equivalent at the date received (HMRC publishes monthly average exchange rates if you do not want to use spot rates), and any foreign withholding tax deducted at source.

Most platforms publish an annual tax statement or transaction export that aggregates this for you. Download it, keep a copy with your tax records, and reconcile it against your own portfolio records before relying on it — platform tax exports have been known to miss reinvested interest or misreport recovery payments as fresh interest.

Where it goes on the return:

  • UK-source P2P interest typically goes on the savings and investments sectionof the SA100 main return, or SA101 supplementary pages if applicable .
  • Foreign-source P2P interest (EU platforms) goes on the SA106 foreign incomesupplementary pages, with a separate entry per country of source .
  • Bad debt relief claims have a specific box — see section 4.

4. Default and Recovery: Bad Debt Relief

When a P2P borrower defaults and your loan becomes irrecoverable, HMRC allows you to claim bad debt relief — offsetting the loss against P2P interest income for tax purposes. Without this relief, you could end up paying tax on gross interest while bearing the full economic loss of the principal, which is the kind of asymmetry HMRC introduced the relief specifically to address.

How the relief works:

  • Losses on qualifying P2P loans can be set against your P2P interest income in the same tax year. If your P2P interest for the year is £2,000 and you have £600 of qualifying bad debt losses, you pay tax on £1,400 of net P2P income.
  • Unused losses can be carried forward and set against P2P interest in future tax years, generally up to four years. If your bad debt losses in one year exceed your P2P interest in that year, the excess does not disappear — you carry the unused portion forward.
  • Losses cannot be set against other types of income — only P2P interest. They are ring-fenced to the asset class.
  • The loss must be on a qualifying P2P agreement— generally an FCA-regulated peer-to-peer loan agreement. Losses on non-qualifying instruments (equity crowdfunding, unauthorised platforms, EU-source loans where the agreement does not meet UK qualifying-P2P criteria) are treated under different rules and may not be claimable under this relief at all .

When a loan counts as “irrecoverable”:

This is the part that traps people. A loan in arrears is not automatically irrecoverable. HMRC’s position is generally that you can claim the loss only when:

  • The borrower has been put through formal recovery proceedings, and
  • There is a reasonable expectation that the loan will not be repaid, or it has been formally written off by the platform.

Loans in active recovery — where the platform is still pursuing collateral enforcement, court action, or borrower negotiation — typically do not yet qualify. A loan flagged “in default” on a platform dashboard is also not automatically irrecoverable for tax purposes; check the platform’s formal write-off status and your own tax adviser’s view of the specific facts.

If recovery later pays out on a loan you have already claimed relief against, you must add the recovered amount back into your taxable P2P income in the year of recovery — the relief is not permanent if the loss reverses.

Practical record-keeping:

Keep, per platform, per tax year:

  • A list of every loan that went into default or recovery during the year.
  • The platform’s formal status update on each (in recovery / formally written off / partially recovered).
  • The principal outstanding at the point of write-off.
  • Any subsequent recovery payments and their dates.

Most UK-domiciled platforms can produce a “bad debt relief eligible” summary on request. EU platforms typically cannot — you need to construct it yourself from the loan-by-loan transaction history.

5. EU Platforms and UK Tax: Foreign Income Rules

Most of the platforms we cover on CrowdIndex are EU-domiciled — CrowdIndex-Mintos in Latvia, Maclear in Switzerland, CrowdIndex-EstateGuru in Estonia, CrowdIndex-Capitalia in Latvia, CrowdIndex-Profitus in Lithuania, and so on. For UK residents, interest from these platforms is foreign-source income, which involves a few extra steps compared to a UK-domiciled platform.

The core points:

  • Foreign P2P interest is reportable on the SA106 foreign income pagesof your self-assessment return , with a separate line per country of source.
  • You report the gross interest in GBP, converted from the original currency at an appropriate exchange rate. HMRC accepts both spot rates at the date of each transaction and HMRC’s own monthly average rates published on gov.uk.
  • EU platforms are NOT IFISA-eligible. No EU-domiciled P2P platform is on the FCA’s approved ISA manager list. There is no way to wrap EU P2P interest in a UK tax-free wrapper — every euro you earn on an EU platform is taxable in the UK if you are UK resident.
  • Currency gains and losses on the underlying principal are typically not separately taxablefor retail P2P lending — but specific facts matter, and large enough portfolios may produce a different answer .

Withholding tax and foreign tax credit:

Some EU jurisdictions deduct a withholding tax at source on interest paid to non-residents. The rate and applicability depend on the country, the platform’s structure, and any double-tax treaty between that country and the UK. Where withholding tax has been deducted at source on your P2P interest, you can usually claim foreign tax credit reliefagainst your UK tax liability on the same income — preventing the same interest from being taxed twice .

The mechanics:

  • The platform deducts withholding tax (if applicable) and pays you net interest.
  • You report the gross interest in GBP on your UK return.
  • You claim foreign tax credit relief for the foreign tax paid, up to the amount of UK tax that would otherwise be due on the same income.
  • The credit reduces your UK tax bill — it is not a refund of foreign tax.

Whether withholding tax actually applies depends on the platform and jurisdiction. Many EU P2P platforms have structured themselves to pay interest gross without deduction at source — common with Latvian and Lithuanian licensed platforms — in which case there is no foreign tax to credit, and the full amount is taxed in the UK at your marginal rate.

This is precisely the kind of area where the right answer depends on specifics: your residency status, the platform’s legal structure, the country of source, and the relevant double-tax treaty. Get a UK tax adviser to walk through your specific platform mix before you assume any particular treatment applies.

Bad debt relief on EU loans:

The qualifying-loan rules in section 4 generally require the loan agreement to be an FCA-regulated UK peer-to-peer agreement. Losses on EU-source P2P loans typically do not qualify for the standard UK P2P bad debt relief— they may be treated under different rules with different (often less generous) outcomes. This is one of the practical reasons UK investors using EU platforms should keep clean per-loan records: the tax recoverability of losses is more constrained.

6. HMRC Resources and Official Guidance

The authoritative sources for current rates, thresholds, and rule changes are on gov.uk. Before filing or before changing your P2P allocation strategy, check these directly:

For anything beyond the basics — particularly anything involving multiple platforms, EU sources, recovery proceedings, or larger portfolios — engage a qualified UK tax adviser. The cost of a one-hour consultation with a chartered tax adviser is small compared to the penalties for filing wrongly, and the complexity of mixing UK IFISA, UK non-IFISA, and EU foreign-source P2P income on a single return is exactly where professional advice pays for itself.

7. Frequently Asked Questions

Do I have to pay tax on P2P interest in the UK?Yes, unless the interest is earned inside an Innovative Finance ISA (IFISA). Outside an IFISA, P2P interest is taxable as savings income at your marginal income tax rate, after any Personal Savings Allowance you have available. Bank interest, building society interest, and most other savings interest count toward the same allowance, so the practical answer depends on your total non-ISA savings income for the year .

What is the IFISA contribution limit for 2025/26? The Innovative Finance ISA shares the overall ISA annual allowance of £20,000, spread across cash ISAs, stocks-and-shares ISAs, IFISAs, and Lifetime ISAs combined. You cannot contribute more than £20,000 across all ISA types in a single tax year, regardless of how you split it between them. ISA rules have been updated in recent years — confirm the current position on gov.uk before you contribute.

Can I hold Mintos, EstateGuru, or Maclear in an IFISA? No. The IFISA wrapper is only available with FCA-authorised UK ISA managers, and no EU-domiciled platform — including CrowdIndex-Mintos (Latvia), CrowdIndex-EstateGuru (Estonia), Maclear (Switzerland), CrowdIndex-Capitalia (Latvia), or CrowdIndex-InRento (Lithuania) — appears on that register. UK investors using EU platforms pay UK income tax on interest at their marginal rate, with no ISA shelter available. This is the headline trade-off: EU platforms offer broader choice and often higher yields, but you cannot wrap them tax-free.

How do I report P2P interest on my UK tax return?UK-source P2P interest goes on the savings and investments section of the SA100 main return. Foreign-source P2P interest (any EU platform) goes on the SA106 foreign income supplementary pages, with a separate line per country of source. You report gross interest in GBP, converted at an appropriate exchange rate, and claim foreign tax credit relief for any withholding tax deducted at source . Register for self-assessment by 5 October following the first tax year you need to file, and file your return by 31 January.

What happens if my P2P loan defaults — can I claim tax relief on the loss? Yes, for qualifying UK FCA-regulated P2P loan agreements. Bad debt relieflets you offset irrecoverable P2P losses against P2P interest income in the same tax year, with carry-forward of unused losses for up to four years . The loss must be on a formally written-off or genuinely irrecoverable loan — loans still in active recovery typically do not yet qualify. Losses on EU-source loans may not qualify for this specific relief and are usually treated under different (less generous) rules, so keep clean per-loan records and consult a UK tax adviser if you have material bad debt across EU platforms.

8. Bottom Line

UK P2P tax treatment is more nuanced than it first appears, but it follows a clear shape once you map it out. Interest is taxable as savings income at your marginal rate, except inside an IFISAwhere it is tax-free up to your £20,000 annual ISA allowance .Self-assessment is required if your untaxed savings income exceeds your Personal Savings Allowance, and the deadlines are firm. Bad debt relief softens the blow on UK qualifying P2P defaults. EU platforms sit outside the IFISA system — broader choice and often higher yields, but no UK tax shelter, and bad debt relief may not be available.

For UK investors building a P2P portfolio: the IFISA should be filled first with whatever UK-domiciled, FCA-authorised platforms suit your risk profile — the tax saving compounds materially over years. EU platforms can play a complementary role at the higher-yield end of the portfolio, but they need to be sized with the post-tax return in mind, not the headline gross yield. A 14% gross EU yield taxed at higher rate (40%) is an 8.4% net yield before any bad debts — closer to a regulated UK platform inside an IFISA than the headline number suggests.

See our full ranking of 19 European P2P platforms →

💡 Top platform on CrowdIndex

Maclear is our #1 rated European P2P platform — Swiss SRO-positioned with 14.5%–14.9% yields, multilingual support, and the only documented case of a CEO covering investor losses from personal funds on a default. Important for UK investors: Maclear is not IFISA-eligible (Swiss-domiciled, not an FCA-authorised UK ISA manager), so interest is taxable as foreign-source savings income on your UK self-assessment return. Bad debt relief rules may differ from UK FCA-regulated P2P agreements. Always consult a UK tax adviser before allocating to EU-domiciled platforms.

See the full Maclear review →

⚠️ Not tax advice — final reminder. This article provides general information about UK P2P tax treatment as of 2026. It is not personalised tax or legal advice. Tax laws change. Allowances and rates are reviewed annually by HM Treasury and HMRC. Your individual circumstances — residence status, total income, marginal rate, platform mix, treaty position — will determine how the rules actually apply to you. Consult a qualified UK tax adviser or chartered accountantbefore relying on anything in this guide for actual filings or investment allocation decisions. All specific rates, thresholds, deadlines, and reliefs marked should be confirmed against the current HMRC guidance at gov.uk at the time you act.

Affiliate disclosure. CrowdIndex earns commissions when readers sign up to platforms through links in this guide. This is how we fund our research. It does not change our editorial ranking or the tax framing in this article. We document our methodology and editorial process publicly so you can verify our reasoning.