Locked at 50/50: When Business Decisions Grind to a Halt

Written by Helen Lyne, Senior Consultant Dispute Resolution Lawyer, Setfords Published: 4 August 2026, Last reviewed: 4 August 2026, Read time: 8 minutes

Plenty of businesses start the same way: two people, splitting ownership 50/50 because it feels fair. That works well while everyone agrees. It’s when they stop agreeing that the problem shows up.

Key takeaways

• Deadlock isn’t always as symmetrical as it looks. Under standard model articles, whoever chairs the board meeting can hold a casting vote on director-level decisions.
• Shareholder-level decisions are different. A general meeting (a formal shareholders’ meeting, as opposed to a directors’ board meeting) has no reliable default tie-breaker, so a 50/50 vote can simply fail to pass.
• A well-drafted shareholders’ agreement can include a deadlock mechanism, such as a buyout option or an independent chair, agreed before anyone’s in dispute.
• Without a mechanism, the options are negotiation, mediation, an unfair prejudice petition, or, as a last resort, winding up the company on just and equitable grounds.
• Courts have wound up 50/50 companies since the 1970s where trust between the parties has broken down completely, so deadlock is taken seriously as a ground in its own right.

Deadlock is exactly what it sounds like: you and your co-shareholder, unable to agree, with the company caught in the middle. It’s especially common where two people set up a business together as equal partners, often without ever expecting to fall out.

The starting point is working out what your company’s documents say, because “50/50” doesn’t always mean a true tie in practice. Standard model articles give whoever chairs a board meeting a casting vote on director-level decisions by default. That means you or your co-shareholder may already hold more effective control than you realise. At shareholder level, the position is usually a true deadlock, since there’s no equivalent automatic tie-breaker for general meeting resolutions.

What are model articles? The standard, government-drafted articles of association that apply to a company by default unless it adopts its own bespoke version. Most small companies use them unchanged, often without realising exactly what they say about situations like a tied vote.

Where your shareholders’ agreement includes a deadlock mechanism, that’s the first port of call. Where it doesn’t, or where the mechanism itself has failed, the law provides a small number of formal routes. All of them work better once you’ve tried to resolve things between yourselves first.

Key figures

Article 13 (board casting vote) · Section 994 (unfair prejudice) · Section 122(1)(g) (winding up)

If your board is deadlocked, here’s what the law provides. Standard model articles hand the chair a deciding vote under Article 13, unless your company has removed that rule. If the deadlock can’t be sorted out between you, a shareholder can ask a court to step in for unfair prejudice, under section 994 of the Companies Act 2006. As a last resort, section 122(1)(g) of the Insolvency Act 1986 lets a shareholder petition to wind the company up on just and equitable grounds.

(Always check your company’s specific articles with a solicitor, as many 50/50 companies expressly exclude the standard casting vote.)

Why deadlock happens

Deadlock doesn’t always mean two founders have fallen out. Often it means the business has grown to the point where difficult decisions have to be made, and the two of you no longer see the same answer.

• Whether to reinvest profits or start taking money out.
• Whether to take on debt to fund the next stage of growth.
• Whether to bring in senior staff who’ll change how the business is run.
• Whether to open a new location.
• Whether to bring in outside investment, and what that means for control.

None of this points to anyone doing anything wrong. It usually means the business has outgrown the informal way two people used to make decisions together.

What deadlock looks like in practice

Deadlock shows up differently depending on which level of decision-making it hits. Here’s what to look out for:

• Board-level deadlock. You and your co-director disagree on a day-to-day management decision. Under the standard model articles, if one of you chairs the meeting, you hold the casting vote and can, in effect, decide the matter. But appointing a chair in the first place is itself a decision the two of you have to agree on. If your board never appointed one, neither of you can simply claim the casting vote for yourself.
• Shareholder-level deadlock. A resolution requiring shareholder approval, such as issuing new shares or changing the articles, simply can’t get the majority it needs. There’s no default tie-breaker here, so the resolution fails outright.
• Total breakdown. The relationship has broken down so completely that the company can’t function at any level, regardless of what the articles technically allow.

What is a casting vote? An extra, deciding vote given to whoever chairs a meeting, used only when the votes on a proposal are otherwise tied. At board level, model articles generally hand this to the meeting’s chair by default. At shareholder level, this kind of automatic tie-breaker generally doesn’t apply.

Deadlock mechanisms you can build in

A shareholders’ agreement drafted while things are still amicable can include a mechanism specifically for this situation, so a dispute doesn’t have to end up in court at all:

• Russian roulette or shotgun clause. One shareholder names a price for their shares. The other must either buy at that price or sell their own shares at the same price, which tends to keep both sides honest about the true value.
• An independent chair or third director. Bringing in a neutral third person to chair meetings, or to sit as a third director, removes the risk of either side holding an accidental casting vote.
• Mandatory mediation or expert determination. Requiring the parties to attempt mediation, or refer a specific disputed decision to an independent expert, before anything more formal.
• A pre-agreed exit mechanism. A put or call option, exercisable once deadlock has lasted a set period, giving one side a clear, pre-priced route to buy out the other.

What happens without a deadlock mechanism

1. Direct negotiation. Often still the fastest route, particularly where the underlying business relationship, whatever its current state, has some value worth preserving.
   
2. Mediation. An independent mediator can help two deadlocked founders reach a workable exit even where direct negotiation has stalled.
   
3. An unfair prejudice petition. Available under section 994 of the Companies Act 2006, this lets a shareholder go to court over unfair harm to their interests as a member. This applies whether or not that conduct is unlawful in itself. In a deadlock, this often means one side has used their casting vote, or their day-to-day control, in a way that’s truly unfair, not just unwelcome to the other side.
   
4. Winding up on just and equitable grounds. The last resort under section 122(1)(g) of the Insolvency Act 1986. Since Ebrahimi v Westbourne Galleries in 1973, the courts have accepted that a fundamental breakdown of trust between equal partners in a small company can itself justify winding it up. This applies even where the company’s formal documents give no obvious right to do so.

What slows down resolving deadlock

Neither side wanting to be the one who leaves. Deadlock often persists simply because both founders feel equally entitled to stay, with neither prepared to be the party who walks away.

No agreed valuation method. Even where both sides accept one of them should exit, disagreement over what the shares are worth can drag the dispute out as long as the deadlock itself.

Uncertainty over who controls what. Founders who’ve never checked their articles are often surprised to find the casting vote, or the lack of one, changes their bargaining position significantly.

What helps resolve deadlock

Check your articles before you do anything else. Knowing exactly who holds the casting vote, if anyone, changes the whole shape of the negotiation from day one.

Get an independent valuation early. Removing the argument over what the shares are worth clears the path to a buyout far faster than leaving it unresolved.

Try mediation before things harden. A neutral third party can often find a workable exit that two deadlocked founders can’t reach on their own.

Put a proper deadlock mechanism in place if you don’t have one. Even mid-dispute, agreeing a mechanism for next time can sometimes unlock the current disagreement too.

Resolving a 50/50 deadlock depends on your company’s specific articles, any shareholders’ agreement, and what both sides want to happen next. Speak to our shareholder disputes team for a confidential, no-obligation conversation about your options.

Common mistakes

1. Assuming 50/50 ownership means equal control in every scenario. The casting vote provision in standard articles can quietly hand one side the advantage, so check the articles before assuming the position is symmetrical.
   
2. Never putting a deadlock mechanism in the shareholders’ agreement. Deadlock is far cheaper to solve on paper before it happens than to resolve once it has, so build a mechanism in from the outset.
   
3. Letting the business suffer while the standoff continues. An unresolved deadlock can damage the company both sides are fighting over, so get advice and consider mediation early rather than letting it drift.
   
4. Treating winding up as the automatic answer. Courts generally prefer a less drastic remedy, such as a buyout, where one is available, so treat winding up as a last resort rather than a first move.

When to speak to a solicitor

If you and your co-shareholder have reached deadlock, getting advice early gives you the clearest possible picture of where you stand. This is useful whether or not you go on to instruct Setfords.

Speak to a solicitor if:

• You and your co-shareholder can’t agree on a key business decision and it’s affecting the company.
• You’re not sure who holds the casting vote under your company’s articles.
• You don’t have a shareholders’ agreement, or yours doesn’t cover deadlock.
• You’re considering buying out your co-shareholder, or believe they may want to buy you out.
• The relationship has broken down to the point where you’re not sure the business can continue as it is.

What to bring to your first conversation

Having the right documents to hand at your first conversation with a solicitor makes it far more productive. Gather together:

• The company’s articles of association and any shareholders’ agreement.
• The share register showing exact ownership percentages.
• Board minutes or correspondence showing the decisions in dispute.
• Recent company accounts or management figures.

FAQs

Does the chairman always get a casting vote in a 50/50 company?

Not always. Standard model articles give the chair of a board meeting a casting vote by default, but many companies amend their articles to remove it. This is often done deliberately, to avoid handing one side an advantage. Check your own company’s articles rather than assuming either way.

Can a court force one shareholder to sell to the other?

Yes, this is the usual outcome of a successful unfair prejudice petition, a share purchase order requiring one side to buy the other’s shares at a fair value. Courts generally prefer this to winding the company up where a buyout is realistically achievable.

What if neither of us can afford to buy the other out?

This is a real practical constraint courts take into account. Options can include a phased buyout, bringing in external investment, or, where no buyout is realistically achievable, selling the business as a whole or winding it up.

Is winding up the company the only option in a serious deadlock?

No. It’s generally treated as a last resort. Courts have a wide range of remedies available under an unfair prejudice petition, including a share purchase order. They’ll usually prefer one of these over ending the company entirely if it achieves a fair outcome.

Should we have avoided this by having a shareholders’ agreement?

In most cases, yes. A shareholders’ agreement with a proper deadlock mechanism, such as a shotgun clause or an agreed exit process, resolves most 50/50 disputes long before they need a solicitor. It’s one of the most common gaps we see in businesses that end up in a real standoff.

If you’re in a shareholder deadlock, speak to our shareholder disputes team for a confidential, no-obligation conversation.

About the author:

This article is general information about shareholder deadlock in England and Wales and is not legal advice. The law can change and every situation is different, so please speak to a qualified commercial disputes solicitor about your circumstances.