A first angel deal arrives as a stack of PDFs with a deadline attached. Most of it is boilerplate. A surprising amount of it is not, and the parts that aren't tend to be buried in the clauses nobody reads aloud on the call. The point of knowing the documents in advance is simple: you can tell, quickly, which one you're holding and what it's quietly deciding.
What follows is the shape of a standard priced equity round - the kind where shares are issued at an agreed valuation and the round qualifies, or hopes to qualify, for SEIS or EIS relief. Convertible structures look different, and we'll come to those.
The term sheet: the shape of the deal
First in, and the shortest. The term sheet sets the headline terms - how much is being raised, at what valuation, the rights attaching to the new shares, who sits on the board. It reads like a contract and mostly isn't one. The commercial terms are usually expressed as intentions, subject to due diligence and to the long-form documents that follow.
A handful of clauses normally do bind: confidentiality, any exclusivity or no-shop period, and who pays the legal costs if the deal falls over. The label at the top of a paragraph matters less than the drafting underneath it, so read for which clauses say they bind. For the detail of what's negotiated here, our guide to the term sheet goes clause by clause.
The term sheet sets the direction. The agreements that follow are where the money actually changes hands.
The subscription agreement: your contract to buy
This is the one that commits you. The subscription agreement records how many shares you're buying, at what price, the conditions that must be met before completion, and - the part that earns its keep - the warranties. Warranties are statements of fact the company and often the founders give you about the business: that it owns its intellectual property, that the accounts are accurate, that there's no litigation hiding in a drawer. If a warranty turns out to be false and you've lost money as a result, it's the basis of a claim.
For a single angel writing a modest cheque alongside a lead, the warranty package is usually lighter than what a VC extracts. It's still the document that defines what you were promised, so it's worth knowing what you can and can't rely on later.
The shareholders' agreement: how the company is run
If the subscription agreement gets you in, the shareholders' agreement governs life afterwards. It covers how decisions are made and which ones need investor consent (issuing new shares, taking on debt, changing the business, selling the company), what information you're entitled to and how often, what happens when a founder leaves - good leaver, bad leaver - and the rules on transferring shares: pre-emption, drag-along, tag-along.
For a small angel position, the practical questions are narrow. Do you get accounts and a regular update? Is there a pre-emption right that lets you defend your percentage in the next round? Our piece on pro-rata rights explains why that one clause matters more than it looks.
The articles of association: the company's constitution
The shareholders' agreement is a private contract between the parties. The articles are the company's public constitution, filed at Companies House, and they bind everyone who holds shares - including people who never signed the shareholders' agreement. A funding round almost always adopts new articles, and the share rights live here: the different classes of share, voting, dividends, and any liquidation preference setting who gets paid first on an exit.
Two documents, then, can govern the same point - and where they conflict, which one wins is itself a drafting question. This is also where SEIS and EIS quietly intersect with the paperwork. The reliefs generally require ordinary shares carrying no preferential right to your money, so a preference or a special dividend written into the articles for the angel round can put the relief at risk. If it matters to you, it's worth checking before signature rather than after.
The disclosure letter: where the truth lives
The disclosure letter is the most under-read document in the stack, and the most revealing. The subscription agreement warranties say the business is in good order. The disclosure letter lists the exceptions - the contract that's gone unsigned, the customer dispute, the IP that hasn't been assigned across yet, the key hire who's mid-notice. Anything fairly disclosed here generally can't form the basis of a later warranty claim.
Which means the disclosure letter is, in effect, the company's own confession of where the bodies are. Read it against the warranties, line by line. It tells you more about the real state of the business than the deck ever did.
The cap table and the tax certificates
After completion, two things should land. First, an updated cap table showing your shares and your percentage - sense-check it against what you agreed, including any option pool that dilutes everyone.
Second, where the round qualifies, the tax certificate. SEIS and EIS both need HMRC advance assurance obtained by the company before the raise, and after your shares are issued the company gives you an SEIS3 or EIS3 certificate, which is what you use to claim the relief on your tax return. The relief is real money: SEIS offers 50% income tax relief on up to £200,000 invested per tax year, EIS offers 30% on up to £1,000,000 (or £2,000,000 where at least £1,000,000 goes to knowledge-intensive companies), each with a minimum three-year holding period. The full conditions and current figures are on gov.uk for SEIS and EIS. You'll generally need to be a UK taxpayer to use them.
What changes with a SAFE or convertible
Not every angel deal is a priced round. In a convertible - a SAFE (Simple Agreement for Future Equity), a convertible loan note, or a UK advance subscription agreement (ASA) - the instrument itself is the document you sign. You put money in now and the shares come later, usually at the next priced round, with the valuation deferred.
That collapses the stack into one or two documents up front, but it changes the tax picture. SEIS and EIS generally require shares to be issued at the time you invest, so a plain SAFE or an open-ended convertible note often won't qualify - which is why many UK rounds use an ASA with a longstop date instead. Our comparison of SAFEs and convertible notes sets out where they diverge.
Who reads all this for you
Often, nobody. Plenty of small angel cheques go through on the lead's documents without separate legal review, and that's a normal risk to take with a small position in a standard round. But the company's lawyers act for the company. A syndicate lead's review is done in the lead's interest, not yours. For a larger cheque, an unusual structure, or any deal where the SEIS/EIS relief is doing real work, a solicitor reading the subscription agreement, the shareholders' agreement and the articles is cheap against the position you're taking.
None of the above is investment or legal advice - it's a map of the paperwork, not a recommendation to do any deal. Before you commit capital, take FCA-regulated advice, and confirm the current SEIS and EIS rules on gov.uk rather than on the word of anyone selling you the round.
Frequently asked questions
What legal documents do I sign as an angel investor?
In a typical UK priced round you'll usually sign a subscription agreement (your contract to buy the shares and the warranties you rely on) and a shareholders' agreement (how the company is run and what protections you get). You countersign the term sheet earlier, you receive a copy of the new articles of association and the disclosure letter, and after completion you should get an updated cap table and, where the round qualifies, an SEIS3 or EIS3 certificate to claim your tax relief. A convertible instrument such as a SAFE or an advance subscription agreement is itself the document you sign, with the share paperwork following at the next priced round.
What is the difference between a subscription agreement and a shareholders' agreement?
The subscription agreement is the deal: it sets out how many shares you're buying, at what price, the conditions to completion, and the warranties the company gives you about the state of the business. The shareholders' agreement is the ongoing relationship: how decisions get made, what needs investor consent, information rights, what happens if a founder leaves, and how shares can be transferred. One gets you in; the other governs life on the cap table afterwards.
Why does the disclosure letter matter to an angel?
Because it quietly edits the warranties you're relying on. The subscription agreement says the company is in good order; the disclosure letter lists the exceptions - the unsigned contract, the pending dispute, the IP that's not yet assigned. Anything fairly disclosed there generally can't be the basis of a later warranty claim, so the disclosure letter is where the real picture of the business sits. Read it against the warranties, line by line.
Do these documents affect my SEIS or EIS relief?
They can. SEIS and EIS relief generally require ordinary shares carrying no preferential right to your money, so terms in the articles or shareholders' agreement that give the angel round a liquidation preference or special dividend can put the relief at risk. The reliefs also depend on the company qualifying and holding HMRC advance assurance, with the SEIS3 or EIS3 certificate issued after your shares are. If the relief matters, have the structure checked before you sign. This is general information, not advice - confirm the current rules on gov.uk.
Do I need my own lawyer for an angel investment?
Not always, and many small angel cheques go through on standard documents without separate legal review. But the company's lawyers act for the company, not for you, and a syndicate lead's review is done in the lead's interest. For a larger cheque, an unusual structure, or anything where the SEIS/EIS relief is doing real work, paying a solicitor to read the subscription agreement, the shareholders' agreement and the articles is cheap relative to the position you're taking. This is general information, not investment advice.