Shareholders Agreements Explained for Small Companies

A shareholders agreement is a private contract between the owners of a company setting out who decides what, how shares can be bought and sold, and what happens when someone leaves, dies or falls out with everyone else. Your constitution doesn't cover most of that, and the Corporations Act's default rules cover even less. If two or more people own shares in your company, this is the document that decides how badly a break-up will hurt.

What the constitution doesn't do

Every Australian company is governed by internal rules. You get them from one of three places, and most small companies rely on the thinnest option without realising it.

Notice what's missing from the first two columns. Nothing in the replaceable rules or a standard off-the-shelf constitution tells you whether a co-founder who stops turning up keeps their 50%, sets a minimum time commitment, stops your business partner selling their half to a stranger, or decides whether profits get paid out or reinvested. Those are exactly the questions that end companies.

An agreement is also private — it never goes on the ASIC register, so your pay arrangements, buy-out formula and reserved-matter list stay between the owners. If you're still deciding how to structure the business, start with the company structure guide.

When to do it

Before money, before customers, before the business is worth anything. Two reasons:

Negotiation is easy when the shares are worthless. On day one, agreeing that unvested shares get bought back at issue price is a fair-sounding rule nobody objects to. Three years in, when the same clause would cost your co-founder $200,000, they will object.

Disputes arrive without warning. Illness, a relocation, a marriage breakdown, a better offer, or one founder working 60-hour weeks while the other has quietly checked out.

The practical trigger points: registering the company, taking on a new shareholder, issuing equity to staff, or any outside investment. If you're past all of those, do it now — still far cheaper than the alternative.

The clauses that actually matter

Decision-making thresholds

Under the Corporations Act, most decisions pass on a simple majority of votes cast, and structural ones like changing the constitution need a special resolution of 75%. A 50/50 company therefore has a hidden problem: neither owner can pass anything the other opposes, and neither can remove the other.

A good agreement separates decisions into three tiers:

• Day-to-day — the directors decide, no consultation needed.
• Reserved matters requiring a higher threshold — typically 75% or unanimous shareholder approval.
• Unanimous only — issuing new shares, changing shareholding percentages, winding up.

Your reserved-matters list is where the real negotiation happens. Common entries: borrowing or capital spending above a set amount, hiring or firing senior staff, changing director salaries, long-term contracts, related-party transactions, guarantees, and starting or settling litigation. Set the dollar thresholds to suit your actual turnover — a $50,000 approval threshold is meaningless for a business turning over $180,000 a year.

Roles, time and pay

Write down what each shareholder is expected to do: role, minimum days per week, salary or drawings, and what happens if they cut their hours. State whether shareholders are employees, contractors or neither, because that determines super, PAYG withholding and leave. Directors who work in the business are usually employees for super guarantee purposes — 12% in FY 2026-27, calculated on qualifying earnings, which replaced ordinary time earnings as the super base when payday super started on 1 July 2026.

Dividends and profit distribution

Two co-founders with identical shareholdings can want completely different things from the profits — one wants a house deposit, the other wants to reinvest in stock. Set a policy: a target percentage of after-tax profit distributed each year, a minimum cash buffer, and the process for varying it. Cover whether distributions will be large enough to fund shareholders' tax on franked dividends.

Share transfers and pre-emptive rights

This is the clause that stops your business partner's shares ending up with their ex-spouse or a competitor. Two default protections exist and both are weak:

• Section 254D (a replaceable rule) requires directors of a proprietary company to offer newly issued shares to existing holders of that class first. It says nothing about a shareholder selling shares they already own.
• Section 1072G (also a replaceable rule) lets directors refuse to register a transfer — a blunt veto that can itself become the dispute.

A proper pre-emption clause sets out a process instead: the seller gives written notice, existing shareholders get a fixed window (30 or 60 days is common) to buy at a defined price, unbought shares can be offered externally but on terms no better than those offered internally, and any buyer must sign a deed of accession before the transfer is registered.

Drag-along and tag-along

Two sides of the same coin, and both belong in every agreement.

Drag-along lets a defined majority (say holders of 75% or more) force the rest to sell into a whole-of-company offer on the same terms. Without it, one holdout with 5% can kill the sale of an entire business.

Tag-along does the opposite: if a majority holder sells, minorities can require the buyer to take their shares too, at the same price and terms. Without it, the majority sells at a premium and the minority is left with a new, unknown business partner.

Vesting for sweat equity

If shares are being issued for future work rather than cash, they should vest over time. The standard shape is a four-year vest with a 12-month cliff: nothing vests in the first year, then the balance accrues monthly.

Here's what that means. Two founders each subscribe for 480 shares at $1.00, so 960 shares are on issue and each owns 50%. Vesting runs monthly over 48 months. Alex resigns after 18 months.

• Vested: 18 ÷ 48 = 37.5%, so 0.375 × 480 = 180 shares
• Unvested and bought back at the $1.00 issue price: 480 − 180 = 300 shares, costing $300
• Shares left on issue: 960 − 300 = 660
• Sam now holds 480 ÷ 660 = 72.7%; Alex holds 180 ÷ 660 = 27.3%

Without a vesting clause, Alex walks away with 50% of a business they worked in for 18 months, and Sam spends the next decade building value for them. A company buying back its own shares has to follow the buy-back procedure in the Corporations Act, so have this clause drafted properly rather than copied from a US template.

Deadlock

For 50/50 companies especially, spell out an escalation ladder: a defined negotiation period, then mediation, then a mechanism that actually ends it. Options include a shotgun clause (one shareholder names a price per share and the other must buy at that price or sell at it), an expert valuation and forced buy-out, or an agreed wind-up. An independent third director with a casting vote is cheap insurance compared to litigation.

Exit, valuation and leaver classes

Decide two things now: how the price is worked out, and whether the reason for leaving changes it.

Pick a valuation method and write it down — an agreed multiple of EBITDA or maintainable earnings, net asset value, or an independent valuer appointed by a nominated professional body. Vague words like "fair value" with no mechanism just relocate the argument.

On leaver classes, a "good leaver" (illness, death, retirement after a minimum term, redundancy) is usually paid full value; a "bad leaver" (resigning inside a minimum term, serious misconduct, breaching restraints) may be paid the lower of cost and fair value, or fair value less a stated discount. Define the categories precisely and set payment terms — a company that must find $180,000 in 14 days may not survive the exit it just funded.

Death and disability

If a shareholder dies, their shares pass under their will and you may find yourself in business with their estate. The standard fix is a compulsory transfer clause triggered on death or permanent incapacity, backed by buy/sell insurance so the survivors have cash to pay. Get the policy ownership and tax treatment right with your accountant — it's easy to structure this in a way that creates a CGT problem. Our guide to business insurance covers how these policies sit alongside your other cover.

Restraints, IP and confidentiality

A departing shareholder taking your client list elsewhere is a predictable event. Include confidentiality obligations, IP assignment so business IP sits in the company rather than a founder's own name, and a restraint of trade with cascading time and area limits, so a court can read down an overreach instead of striking the clause out.

What it costs

Templates fail in predictable ways: US-drafted clauses that don't match the Corporations Act, valuation mechanisms with no appointed decision-maker, and drag/tag thresholds that don't match the actual cap table. If you use one, pay a lawyer for a fixed-fee review rather than a full draft. Compare that to a contested shareholder dispute, which routinely runs into five figures once both sides have lawyers. Set against your other formation costs — see company setup costs, where ASIC registration is $636 and the annual review fee $342 — it's good value.

Getting it signed

Each shareholder should get independent legal advice, or sign an acknowledgement that they were told to and declined — that kills the "I didn't understand what I was signing" argument later. Keep the signed agreement with your company register, and review it whenever ownership, roles or the size of the business change materially.

If your business is a partnership rather than a company, the equivalent is a partnership agreement, and our overview of business contracts covers the rest of the paperwork.

Key takeaways

• A shareholders agreement is a private contract between owners; the constitution and the Act's replaceable rules cover almost none of what causes co-founder disputes.
• Sign it before the business has value — clauses that are uncontroversial on day one become unnegotiable once someone wants out.
• The clauses that earn their keep: reserved matters, pre-emption on transfers, drag and tag, vesting, deadlock, leaver classes and a defined valuation method.
• Vesting is the biggest protection for sweat equity — a 48-month vest with a 12-month cliff means a founder who leaves at 18 months keeps 37.5% of their allocation, not all of it.
• Budget roughly $1,500 to $5,000 plus GST for a lawyer-drafted agreement (as at September 2026), or a template plus a fixed-fee legal review.
• Make every new shareholder sign a deed of accession before their transfer is registered.

Where to get help

• ASIC — company rules and constitutions, replaceable rules, and registering changes to company details and share structure.
• business.gov.au — plain-English guidance on company obligations and dispute support.
• Australian Small Business and Family Enterprise Ombudsman — free assistance and referrals to low-cost dispute resolution; your state or territory Small Business Commissioner also offers subsidised mediation.
• A commercial lawyer — for drafting or reviewing the agreement, the vesting and buy-back mechanics, and restraint clauses.
• Your accountant — for the tax and CGT consequences of share transfers, buy-backs, dividend policy and buy/sell insurance ownership.