Every April, the same thing happens. UK investors with cash to deploy start thinking about their ISA allowance. £20,000 for 2026/27. Tax-free returns. Use it or lose it.
If you run an investment platform that offer debt or loan products, whether that's property lending, renewable energy bonds, impact investments, or any other debt instrument, some of your investors are asking themselves: can I hold this in an innovative finance ISA?
If the answer is no, you're losing them to platforms where the answer is yes.
This year is different
The 2026/27 tax year is the last year that under-65s can put the full £20,000 into a cash ISA. From April 2027, the cash ISA allowance drops to £12,000, with the remaining £8,000 available only for investment ISAs — Stocks & Shares and Innovative Finance.
That's not a threat to alternative finance platforms. It's an opportunity. The government is actively steering capital away from cash savings and towards investments. If your platform offers ISA-eligible products but doesn't have an ISA wrapper, you're missing the tailwind.
Meanwhile, dividend tax rates have risen by two percentage points from April 2026 and the capital gains annual exemption sits at just £3,000. The tax advantage of holding investments inside an ISA wrapper is now more valuable than it's been in years. Your investors know this. The question is whether your platform can accommodate it.
What ISA capability actually involves
Adding an ISA wrapper to your platform is not a product decision. It's an infrastructure and regulatory commitment. Here's what sits behind it.
FCA authorised. You need to have the correct regulatory permission of being a deposit taker or being able to hold client money or work with someone or has those permissions. ShareIn have been holding client money since 2019.
HMRC ISA manager approval. You need to be an approved ISA manager, or work with one. This is in addition to the FCA permission, it's a separate HMRC approval process with its own application, fitness criteria, and ongoing obligations.
Subscription tracking and threshold policing. Every investor has a £20,000 annual allowance across all their ISAs. Your platform needs to track subscriptions in real time and prevent breaches. Get this wrong and the investor loses their tax-free status on the excess, a major problem.
ISA transfers. Prior year ISA pots can be very large if they have been built up for several years and investors can transfer their ISA (Cash, Stock & Shares or Innovative Finance) to another manager. You need to handle the record keeping of transfers in and transfers out, with specific timescales set by HMRC.
HMRC reporting. Annual returns to HMRC are mandatory — ISA subscription data, transfer records, investor details. The data requirements are specific and the deadlines are firm.
Ongoing compliance. Eligible investments must remain eligible for the life of the ISA holding. Deceased investor accounts have specific handling requirements. Flexible ISA rules, which allow investors to withdraw and replace funds within a tax year without losing allowance, add another layer of operational complexity.
This isn’t just a one-off build, ISA administration is a permanent operational commitment.
Two models for adding ISA capability
There are two ways to approach this, and the right answer depends on your regulatory status and how much resource you have to dedicate, given your existing business priorities.
Use an external ISA manager. ShareIn holds HMRC ISA manager approval and FCA authorisation. We act as the ISA manager for your platform, handling the wrapper administration while your investors see your brand, your portal, and your investment products. You don't need your own ISA manager status. This is how many of our clients operate.
Use ISA infrastructure with your own status. If you already hold (or plan to hold) ISA manager approval, our ISA API handles the administration layer — subscription tracking, threshold policing, transfer management, and HMRC reporting — while you retain the regulatory relationship. You get the operational infrastructure and expertise without building it from scratch.
Either way, the investor experience is seamless. They see your platform, your brand, and the ISA wrapper sitting around the investments they've chosen. The administration runs underneath.
What happens when things go wrong
If a platform needs to go into administration it is very important that administrators know exactly who’s cash is being held and what can and can’t be used for the administration. The ISA brand is important and HMRC knows that. It's the reason why the HMRC ISA rules stipulate that cash held in an ISA wrapper must be given the protection of Client Money status, it’s not the platforms money it’s the customers.
The timing
The 2026/27 tax year started on 6 April. Your investors are making ISA decisions now. Every month you wait is a month where ISA-eligible investors are deploying their allowance elsewhere, into platforms that already offer the wrapper. We've been an ISA Manager since the Innovative Finance ISA launched in 2016.
If you've been meaning to add ISA capability, there's no better time. The allowance rules are working in your favour, the tax environment makes ISAs more valuable than ever, and the infrastructure exists to get you live without building it yourself.
Get in touch to talk about how ISA capability could work on your platform.
ShareIn Ltd (FRN 603332) is authorised and regulated by the Financial Conduct Authority and is an approved HMRC ISA manager. ISA eligibility does not guarantee returns. Capital at risk. Tax treatment depends on individual circumstances and may change