Ask most people what an angel investor does and they'll describe a single moment: a cheque, a handshake, a slide deck closed with a grin. That moment is real, and it's also the least demanding part of the entire arrangement. The transfer takes minutes. The relationship it starts can run for the better part of a decade.
What fills those years is the actual work - and it's where good angels separate themselves from the ones who simply happened to have spare capital. Below is a plain-English map of what UK angels typically do once the money has landed. A note before we start: none of this is investment advice. The Carry is editorial journalism, describing how the role works, not what anyone should do with their own money.
How do angels actually help a company - beyond money?
The shorthand the industry uses is "smart money", and it's one of those phrases that sounds like marketing until you've watched it work. The plain version: an early-stage company's biggest constraint is rarely cash. It's access. Access to the right hire, the first serious customer, the lawyer who won't overcharge, the later-stage fund that leads the next round.
A connected angel collapses that distance. An introduction to a prospective head of engineering can turn a three-month search into a fortnight. A warm forwarding email to a corporate buyer gets a meeting the founder would have spent six weeks chasing cold. None of it shows up on a cap table, and all of it changes the trajectory.
The best angels are deliberate about this. They tell founders, up front, exactly where they can help and where they can't - so a fintech specialist isn't pretending to open doors in biotech. Honesty about the edges of your usefulness beats the vague promise of "adding value", which is the phrase founders have learned to distrust most.
Hiring, advice, and being a sounding board
Founders are often technically brilliant and managerially untested. The first ten hires set the culture of the company for years, and they're frequently made by someone who has never built a team before. An angel who has - or who has watched it go wrong a dozen times - earns their keep here: helping write the role, sitting in on final interviews, talking a founder out of the charismatic hire who'll detonate the team in six months.
Then there's the quieter service: being the person a founder can call at 11pm without it ending up in a board minute. Running a young company is lonely, and a trusted backer with no agenda beyond the company doing well is rare. Much of what angels call "support" is really this - reducing the odds that an avoidable mistake becomes a fatal one.
The cheque buys you a seat at the table. Whether anyone wants to hear from you again is earned afterwards.
Why do angels keep investing in the same company?
Here's the part newcomers underestimate. The first cheque is an opening bid, not a final position. When a company that's doing well raises its next round, existing investors are usually offered the chance to put in more - a follow-on investment. Many angels deliberately hold back capital for exactly this, so they can double down on the companies that are working.
Two reasons. First, returns in early-stage investing are brutally concentrated; a small number of companies tend to drive almost all of the gains, so the ability to back a winner again is worth a lot. Second, dilution. Every new round issues new shares, which shrinks the percentage everyone already owns. Following on lets an angel defend their stake rather than watch it thin out round after round.
There's a tax wrinkle worth knowing. SEIS and EIS income tax relief applies per investment, not per company - so a follow-on can qualify for relief in its own right, provided the company and the shares still meet the scheme rules at the time. That's not guaranteed, and the company-side limits tighten as a business grows, which is the next thing.
Getting the structure right: SEIS, EIS and the paperwork
This is the part that doesn't make for good war stories and quietly decides how much money an angel keeps. The UK's two main early-stage tax schemes - the Seed Enterprise Investment Scheme (SEIS) and the Enterprise Investment Scheme (EIS) - exist to offset some of the risk of backing young companies. The headline reliefs, on the investor side, are these:
- SEIS gives 50% income tax relief on up to £200,000 invested per tax year, with a minimum holding period of three years. Gains on the shares are exempt from capital gains tax if held for at least three years and income tax relief was received; loss relief is available; and relief can be carried back to the previous tax year. There's also a capital gains reinvestment relief worth 50% of a gain put into SEIS shares, on up to £100,000 a year.
- EIS gives 30% income tax relief on up to £1,000,000 per tax year - or £2,000,000 if at least £1,000,000 of it goes into knowledge-intensive companies. Same three-year minimum hold, CGT deferral relief, CGT exemption on the shares if held three years with relief, loss relief, and carry-back to the previous year.
The point for this article isn't the numbers themselves - it's that structuring the deal so the relief actually lands is part of what a competent angel watches for. A company has to apply to HMRC for advance assurance (a pre-investment sign-off that the round should qualify) before the money goes in, and then issue each investor an SEIS3 or EIS3 certificate after the shares are allotted. Without that certificate, the investor can't claim. Angels routinely check the company is on top of this before committing, because a relief worth half the cheque is not a detail you discover after the fact.
The eligibility rules sit on the company's side. SEIS is for the youngest businesses - broadly, trading for less than three years, fewer than 25 full-time-equivalent employees, gross assets under £350,000 at the share issue, and a £250,000 cap on what the company can raise under SEIS in total. EIS is for slightly larger but still early companies, and its company-side limits - gross asset caps, annual and lifetime fundraising limits, the employee count, and the more generous variations for knowledge-intensive firms - are set out in full on gov.uk and have been revised, so check the current figures directly: HMRC's EIS guidance. As a rough guide, EIS generally covers companies within seven years of their first commercial sale, under 250 full-time-equivalent employees, with separate rules and higher caps for knowledge-intensive businesses.
For completeness, the third scheme angels meet is the Venture Capital Trust (VCT): 20% income tax relief on up to £200,000 a year, a five-year minimum hold, tax-free dividends and no CGT on gains - though, unlike SEIS and EIS, VCTs offer no loss relief. To use any of these reliefs you generally need to be a UK taxpayer. The reliefs are what make the risk maths work, which is why getting them right is core to the job rather than an afterthought.
Board seats, reporting and the lead angel
On larger angel rounds, someone usually takes the lead. A lead angel negotiates the headline terms - mainly the valuation and the shareholder rights - and the other angels typically come in on those same terms. The lead does the heaviest diligence, and often stays closest to the company afterwards, sometimes taking a board seat or an observer role.
That brings governance duties: reading the monthly numbers, holding the founders to the plan without smothering them, and being a sober voice when a board gets giddy or panicked. It's a balance. Too absent and the angel adds nothing; too involved and they become the back-seat driver every founder dreads. Most of the skill is knowing which mode the moment calls for.
And when things go wrong - which, for early-stage companies, they often do - the post-cheque work gets real. Bridging a cash crunch, helping renegotiate with a difficult investor, managing an orderly wind-down so people get paid and reputations survive. None of that is in the term sheet. All of it is the difference between a backer and a name on the register.
So what's the role, really?
Strip away the mythology and an angel is part financier, part recruiter, part therapist, part deal lawyer's early-warning system. The capital is the entry ticket. What a founder actually remembers - and what other founders hear about - is everything the angel did once the money was no longer the point. That's the part worth understanding before you ever think about writing one.