Before the Handshake Fades: Why Every Co-Founder Should Sign a Shareholders' Agreement

Two people incorporate a limited company over coffee. Each owns 50 shares. Nobody signs anything beyond the incorporation paperwork because, as one of them puts it, "we've known each other twenty years — we don't need lawyers." Four years later, one of them wants out, the other wants to carry on, and there is nothing in writing to say what happens next.

We see the aftermath of this regularly. The company limps on through a dispute that costs more in professional fees — and far more in lost time — than a shareholders' agreement would have cost at the start. If you are going into business with someone, this document is worth understanding before you need it.

What a Shareholders' Agreement Actually Is

A shareholders' agreement is a private contract between the shareholders of a company. Unlike the articles of association — which are public and apply to all shareholders equally — an agreement can be tailored precisely to your situation. It sets out how the company is run, how decisions are made, and critically, what happens when things go wrong.

It is not a legal requirement. That is precisely why so many founders skip it, and precisely why so many end up regretting it. The articles of association that Companies House provides as a default template are deliberately generic. They were never designed to answer questions like "what if my co-founder stops turning up?" or "what is my shareholding worth if I leave?"

The Questions It Should Answer

A well-drafted agreement covers four broad areas.

Decision-making and deadlock. In a 50/50 company, what happens when two directors disagree and neither will budge? Without a mechanism, the company can gridlock entirely — suppliers unpaid, decisions unmade, HMRC deadlines looming. A good agreement includes a deadlock clause: perhaps a casting vote, perhaps a mediation requirement, and in the last resort, a buy-out mechanism where one shareholder can offer to buy the other out at a stated price.

Exiting the business. What happens if a shareholder wants to leave? Can they sell their shares to anyone, or must they first offer them to the other shareholders? This "pre-emption" right is one of the most valuable protections in the whole document — it prevents your co-founder from selling their stake to a stranger, a competitor, or an estranged relative.

Valuation. This is where disputes get expensive. What is a shareholding in a small private company actually worth? An agreement should specify the valuation method in advance — typically an independent accountant or business valuer acting as expert — so that nobody can inflate or deflate the number to suit themselves.

Leavers and their shares. Consider the founder who leaves after eighteen months but keeps their full shareholding. The remaining directors now work full-time for a business part-owned by someone who contributes nothing. A "good leaver / bad leaver" clause addresses this: someone leaving on good terms after a long tenure may keep their shares at fair value, while someone who resigns early or is dismissed for cause can be required to sell at a nominal price.

Two Scenarios We Have Watched Unfold

Scenario one. Two directors, equal shareholdings, no agreement. One falls seriously ill and cannot work for a year. The other carries the business alone but cannot access any of the value being created, cannot restructure the shareholding, and cannot bring in an investor because the absent shareholder's consent is needed. The company survives; the relationship does not.

A shareholder protection policy — insurance paired with an agreement obliging the shares to be offered to the surviving shareholders — would have resolved this cleanly.

Scenario two. Three shareholders, one of whom goes full-time elsewhere while remaining a director and 40% owner. Dividends continue; resentment grows. When the working shareholders finally seek advice, they discover that removing a shareholder with no agreement in place is slow, uncertain, and potentially expensive. The negotiation happens from a position of weakness, because the default legal position favours whoever holds the shares.

The Accounting Dimension

This is not purely a legal matter. The valuation method you choose, the treatment of directors' loan accounts, dividend policy, and how salary and dividends are balanced between shareholders all interact with the agreement. A clause that ignores the tax position — for example, one that triggers a share transfer at an arbitrary price — can create unexpected capital gains tax liabilities for the departing shareholder or a market value problem for the company.

When we advise on shareholder arrangements, we look at the agreement alongside the company's accounts and the shareholders' personal positions. The drafting itself is a job for a solicitor, but the numbers behind it benefit from an accountant's eye before anyone signs.

What It Costs, and What It Prevents

A shareholders' agreement for a small company typically costs a fraction of a single month's professional fees in a serious shareholder dispute. Litigation between founders routinely runs to tens of thousands of pounds, sometimes far more, and can last years. The unfair prejudice remedy under the Companies Act 2006 — often the only recourse without an agreement — is slow and unpredictable.

The comparison is stark. A modest, one-off cost now, drafted when everyone is on good terms and intentions are honest, against an open-ended, adversarial process later, conducted when goodwill has already collapsed.

If You Are Reading This Too Late

If you are already in business with co-founders and there is no agreement, it is not too late. Negotiating one while the relationship is still functional is considerably easier than negotiating one during a dispute, and considerably cheaper than the alternative. Even a partial agreement covering exits and valuation is better than nothing.

Businesses, like marriages, rarely end the way they begin. The document you sign at the start is not an expression of distrust — it is what allows trust to do its job when circumstances change.

If you would like to talk through the financial and tax side of a shareholders' agreement, or a valuation for an existing arrangement, we are happy to help — ideally before the argument starts.