You've agreed terms, the round is closing, and then the email lands: photograph your passport, upload a utility bill, and - for anything sizeable - tell us where the money came from. To a first-time angel it can feel intrusive, even faintly insulting. You came to back a company, not to be vetted like a suspect.
But the firm asking isn't being nosy. It's discharging a legal duty that, if it skipped, could land it with a fine or worse. Understanding what's behind the request makes the whole thing faster - and tells you something useful about whether you're dealing with a serious operator or a sloppy one.
The checks aren't friction someone invented to slow you down. They're the price of clean money reaching real companies.
What are KYC and AML, in plain terms?
KYC stands for "know your customer". It's the process of confirming you are who you say you are - verifying your identity, your address, and that you're not on a sanctions list or flagged as a politically exposed person. AML, anti-money-laundering, is the wider goal that KYC serves: stopping the proceeds of crime from being washed clean by passing through legitimate businesses and investments.
In the UK, the framework is the Money Laundering, Terrorist Financing and Transfer of Funds (Information on the Payer) Regulations 2017 - mercifully shortened to the Money Laundering Regulations 2017, or MLR. They oblige firms in scope to carry out customer due diligence on the people they do business with. Investment platforms, syndicate managers, nominee companies and the funds that pool angel money typically fall inside that scope. So when you invest through one of them, the check is theirs to run on you.
It helps to separate the two questions the firm is really asking. First: are you who you claim to be? That's identity. Second: is the money you're putting in clean? That's source of funds. They feel like one form, but they're answering different risks.
Why the platform asks, and not the founder
This trips up a lot of new angels. The start-up you're backing usually isn't the one running the check - and often can't see the detail of what you've submitted. The obligation falls on the regulated intermediary: the crowdfunding platform, the syndicate's nominee structure, the SPV manager, the fund. They're the ones the law holds responsible for knowing whose money is moving, so they're the ones who collect the documents.
That's also why a clean, well-run onboarding process is a small but genuine signal. A firm that asks the right questions, in a secure way, and can explain why, is one taking its obligations seriously. One that waves you through with no checks at all isn't doing you a favour - it may simply be cutting a corner it will regret, and that's a corner you're now standing near.
What you'll actually be asked for
For a standard angel investment, expect the routine stuff:
- Photo identity. A passport or full UK driving licence. Increasingly this is verified electronically - you photograph the document and take a selfie, and the check clears in minutes against the document's security features.
- Proof of address. A utility bill, bank statement or council tax letter, usually dated within the last three months. A document that's six months old will often be bounced.
- Source of funds. For larger cheques, or where something looks unusual, the firm may ask where the money came from and for evidence - a bank statement showing the balance, a contract from a business sale, a probate or solicitor's letter for an inheritance.
It's worth distinguishing source of funds from source of wealth. Source of funds is the immediate origin of the specific money you're investing - the account it's sitting in and how it got there. Source of wealth is the bigger picture of how you came to be wealthy in the first place. Most ordinary investments only ever touch the first. The second comes up in enhanced due diligence - triggered by size, by a higher-risk profile, or because you're a politically exposed person, which in plain terms means you hold or held a prominent public position, or you're a close associate or family member of someone who does.
How to clear the checks without losing the deal
Here's the practical heart of it. In a competitive round, allocation goes to the people who can confirm and fund quickly. The angel who's still hunting for a passport scan while the round fills up is the one who misses it. Slow KYC is, quietly, one of the most common ways a committed investor ends up out of a deal.
So get ahead of it. Have a clear photo or scan of your passport ready. Keep a recent proof of address to hand. If you're writing a larger cheque, know in advance how you'd evidence the source - and have that bank statement or solicitor's letter accessible rather than buried. If you invest regularly through one platform, your verification usually persists, so the friction is mostly a first-time cost. Many syndicates let you complete onboarding before a specific deal is even live, precisely so you can move the moment one appears.
One more thing: pay attention to how a firm collects all this. Sensitive identity documents should travel through a secure portal, not an open email thread. A serious platform will tell you why it needs each item, how long it holds the data, and who it shares it with - obligations that sit under UK GDPR alongside the money-laundering rules. If a request feels off, or arrives through a channel you can't verify, that's a reasonable moment to pause and check you're dealing with who you think you are.
Where this sits next to SEIS and EIS
KYC and the tax schemes are separate tracks that happen to run at the same time. Your SEIS relief - 50% income tax relief on up to £200,000 invested in a tax year, with the gain on the shares exempt if you hold for three years and received the relief - depends on the company qualifying and on you being an eligible UK taxpayer who receives an SEIS3 or EIS3 certificate to claim with HMRC. EIS works on the same logic at 30% relief, on up to £1,000,000 a year (or £2,000,000 where at least £1,000,000 goes to knowledge-intensive companies). None of that turns on the KYC check itself.
But the two do touch in one practical way. The relief attaches to shares being issued to you, and shares get issued once your money has actually reached the company. Stall the anti-money-laundering check, and you can stall the funding - which in a round closing near a tax-year boundary can matter, given relief can be carried back to the previous tax year only on shares actually issued. The check isn't a tax obstacle; it's a step on the path your money takes to the place where the relief lives.
For the company-side eligibility rules - gross-asset ceilings, the annual and lifetime raise caps, the knowledge-intensive variations, and the figures that changed in April 2026 - read the current numbers from HMRC's EIS guidance on gov.uk rather than from any single article, because those limits move.
None of the above is a recommendation to invest in anything, or to use any particular platform. It's a map of a control regime that decides whose money is allowed to move and how. The rules, and how they apply to your circumstances, can change - this piece is general information, not financial, legal or compliance advice. Take FCA-regulated advice where your situation calls for it, and read source-of-funds expectations from the firm running your check.
Frequently asked questions
What is KYC for an angel investor?
KYC - know your customer - is the identity and background verification a regulated firm runs before it lets you invest through it. For a UK angel, that usually means confirming who you are with a passport or driving licence and a proof of address, then checking your name against sanctions and politically-exposed-person lists. It is the first stage of customer due diligence under the Money Laundering Regulations 2017. The platform, syndicate manager or nominee carrying out the check is doing it because the law requires them to know who they are taking money from before it goes into a company.
Why does a syndicate ask where my money came from?
Because anti-money-laundering rules require regulated firms to understand the source of the funds being invested, and sometimes the broader source of your wealth. The question is not about your private affairs for their own sake - it is a control to make sure clean money, not the proceeds of crime, is flowing into early-stage companies. A salary, a business sale, an inheritance or an investment exit are all ordinary answers. The firm may ask for evidence such as a bank statement or a solicitor's letter, particularly for larger cheques.
What documents do I need to invest as a UK angel?
Typically a government-issued photo ID such as a passport or full driving licence, and a recent proof of address such as a utility bill or bank statement, usually dated within the last three months. Larger investments, or anything that triggers enhanced due diligence, can require evidence of source of funds - a bank statement showing the money, a contract of sale, or a solicitor's confirmation. Many platforms now verify ID electronically, so you photograph a document and your face and the check clears in minutes.
Does KYC affect my SEIS or EIS tax relief?
Not directly. KYC and anti-money-laundering checks are about confirming who you are and where your money came from; SEIS and EIS relief depends on the company qualifying, you being an eligible UK taxpayer, and you receiving an SEIS3 or EIS3 certificate to claim with HMRC. The two run in parallel. In practice, though, failing or stalling the KYC check can delay your money reaching the company and your shares being issued, which is what the tax relief ultimately attaches to.
Is my personal information safe when I complete KYC?
Regulated firms must hold the identity and due-diligence records they collect, and UK GDPR governs how that data is stored and used. A reputable platform will tell you why it needs each document, how long it keeps it, and who it shares it with. If a firm asks for sensitive information through an insecure channel, or cannot explain why it needs something, that is a reasonable prompt to slow down. This article is general information, not financial, legal or compliance advice - seek FCA-regulated advice where your situation calls for it.