A Co-Founder or Partner Is Leaving, the Steps to a Clean Exit

A co-founder or partner has told you they are leaving. It might be a falling out, a career change, retirement, or a decision that the business has outgrown them. From that moment a defined legal process starts, and its shape depends almost entirely on how the business is structured. Many owners assume the departing person simply steps back and everything else carries on as before. In fact, if the business is a partnership, the departure dissolves the partnership itself. If it is a company, nothing changes legally until the shares are transferred, the resignations are recorded, and the registers are updated.

By the end of the process you will have an outgoing partner or co-founder whose interest has been bought out and formally released, a continuing business under a clear structure, and government records that reflect who actually owns and controls it. For a partnership that means a new ABN in the name of the remaining owner or the new partnership. For a company it means updated shareholdings, an updated members register, and current ASIC records. What will not happen by itself is any of the paperwork: the ABN does not carry over, the share transfer is not registered automatically, and nobody records the resignation for you. Each step below has to be done deliberately.

Before you start

Work through this checklist before you touch any forms:

The governing documents: the partnership agreement, or the constitution and shareholders agreement for a company. You need a clear answer on whether they already deal with a partner or shareholder leaving, because they will usually override the default rules.
A decision on the departing interest: whether the shares or partnership interest will be transferred to the remaining owners, bought back, or sold to a newcomer, and at what price.
A valuation or agreed price: for the departing share of the business, covering goodwill, assets, debts, and any loans the partners or shareholders have made to the business.
A written resignation and any required notices: the notice the partnership agreement or constitution requires, and a letter of resignation from the departing director.
Access to the registries: the ABR details for the partnership ABN, and access to ASIC's company officeholder portal so you can lodge changes online.
The tax picture: GST and PAYG registrations, and a plan for the departing person's final tax return for the business.

The items that actually trip people up are the missing agreement, locked-out ASIC portal access, and the 28 day deadlines that start running as soon as the change happens. Deal with those three first.

The exit process, step by step

Confirm the structure and gather the governing documents

The first step is to confirm which legal framework applies. A partnership is governed by the Partnership Act of the state or territory where the business operates, for example s 32 of the Partnership Act 1892 (NSW). A company is governed by the Corporations Act 2001 (Cth) together with its own constitution and any shareholders agreement.

Read those documents before doing anything else. A partnership agreement will often set out the notice period, how the departing partner's share is valued, and any restraint on the person competing afterwards. A constitution or shareholders agreement will often set out pre-emptive rights, how shares are valued, and what happens on departure. Where a document is silent, the default rules in the Act apply, and those defaults are what the steps below describe. Also decide the practical question now: who keeps trading, and in what form. If two partners remain, they can continue as a new partnership. If one person remains, they continue as a sole trader. A company simply continues, with the remaining shareholders in control.

Give notice of dissolution (partnerships)

A partnership requires two or more people, so when a partner leaves, the partnership dissolves. Where the partnership has no fixed term, any partner may dissolve it simply by giving notice to the others. Under s 32 of the Partnership Act 1892 (NSW) the partnership dissolves from the date stated in the notice, or if no date is stated, from the date the notice is communicated. This is subject to any agreement between the partners, so if the partnership agreement requires 30 days written notice, that requirement governs instead.

The ATO's guidance on changing the makeup of a partnership makes the same point in practical terms: when a partner retires, dies, or a new partner is admitted, the partnership is dissolved and a new partnership is formed.

The notice itself should do three things:

state the departing partner's intention to leave and the date the dissolution takes effect;
call for the accounts to be prepared and the outgoing share to be valued;
arrange handover of records, access, bank signatories, and any leases or licences in the departing partner's name.

Serve it in writing on every other partner and keep a copy. The notice is also the moment the clock starts on the steps below.

Once the partnership is dissolved, the outgoing partner is entitled to their share of the business's value, which means the assets and profits less the debts and expenses. Section 44 of the Partnership Act 1892 (NSW) sets the order for working this out, subject to any agreement: losses are paid first out of profits, then out of capital, and the firm's assets are applied first to paying the debts and liabilities owed to people outside the partnership, with the surplus then divided between the partners according to their entitlements.

How the share is valued depends on what the agreement says. Many partnership agreements specify a formula, a valuation date, or an independent valuer. Where there is no agreement, the parties need to agree a figure for goodwill, plant, stock, work in progress, and the debts the business owes and is owed. This is the step where exits usually stall, because price is a commercial negotiation, not a form.

There is also a trap here that most owners do not expect. Section 42 of the Partnership Act 1892 (NSW) provides that if the continuing partner carries on the business with the firm's assets without a final settlement of accounts, the outgoing partner can choose between a share of the profits made since the dissolution, to the extent those profits are attributable to their share of the assets, or interest at 6% per annum on the value of their share. In plain terms, trading on without settling keeps the departing partner financially interested in the business. The fix is a written settlement that records the amount paid, what it covers, and a release of further claims, signed before the business trades on.

Cancel the old ABN and re-register (partnerships)

The ABN belongs to the partnership as it was constituted, so when the partnership dissolves the old ABN cannot simply be renamed. Under the ABR's guide to changing your business structure you must cancel the existing ABN and apply for a new one. The new application is made in the name of the sole trader who remains, or in the name of the new partnership once it is formed.

The ABR requires you to update your ABN details within 28 days of becoming aware of any change. In this case the change is structural, so the practical steps are:

cancel the old partnership ABN online through the ABR;
apply for the new ABN as a sole trader or new partnership;
review the GST registration, because it does not automatically follow the new entity;
update invoices, letterhead, contracts, and bank details with the new ABN, and tell suppliers and insurers.

The departing partner should also be removed from any bank signatories, merchant accounts, and lease or licence arrangements in their name.

Transfer or buy back the departing co-founder's shares (companies)

For a company the entity continues, so the work is changing who owns and controls it. Start with the constitution and shareholders agreement. Most contain pre-emptive rights, which require the departing shareholder to offer their shares to the existing shareholders first, often at a formula price, before any outsider can buy. If the shares were subject to vesting and have not vested, or the shareholders agreement has leaver provisions, the departing co-founder is usually required to sell the shares back at a reduced formula price, and the company may be obliged to buy them.

The mechanics of moving the shares are governed by the Corporations Act. Under s 1071B of the Corporations Act 2001 (Cth) a company must only register a transfer of shares if a proper instrument of transfer has been delivered to it. If the company buys the shares back rather than another shareholder buying them, s 257A allows a buy-back provided it does not materially prejudice the company's ability to pay its creditors and the procedures in the Act are followed. Once the transfer to the company is registered, the shares are cancelled.

The transfer pack for a departing co-founder typically contains:

a share transfer form (the instrument of transfer) signed by the departing shareholder and the buyer;
board minutes and resolutions approving the transfer, and the shareholder resolution if the agreement requires it;
a buy-back resolution and offer if the company is the buyer;
new share certificates for the remaining shareholders and the cancellation of the old ones;
an updated members register showing the change.

If the shares are being sold to someone outside the existing shareholders, check first whether the pre-emptive rights require the offer to existing shareholders and whether those shareholders will waive their rights.

Record the resignation and update ASIC (companies)

A co-founder who leaves the company will usually resign as director. Under s 203A of the Corporations Act 2001 (Cth) a director may resign by giving written notice to the company at its registered office, although the constitution may impose its own requirements. The resignation is a separate step from the share transfer, and both must be notified.

The company must tell ASIC about the change in officeholders within 28 days under s 205B. Changes to the members register must also be notified to ASIC within 28 days under ss 178A and 178D. The practical vehicle for both is Form 484, Change to company details, which is lodged online through ASIC's portal and covers officeholders and share structures. ASIC's guidance on adding or removing an officeholder confirms the 28 day window and that late lodgement attracts late fees.

The ASIC side of the exit therefore comes down to:

lodging Form 484 for the director's resignation and the change in members;
keeping the resignation letter on file with the company records;
confirming the members register matches what ASIC now holds;
checking whether the departing director has personally guaranteed any company debts, because resignation does not end a guarantee.

Where the process usually stalls

The failure points that stall most exits come down to four recurring problems:

No written agreement: the statute provides default rules, but it cannot tell you the price, the valuation date, or who keeps the client relationships. Those become the subject of negotiation or dispute at the worst possible time.
Trading on without settlement: in a partnership this keeps the outgoing partner's claim to profits or interest alive under s 42 of the Partnership Act, sometimes for years.
Missing the 28 day deadlines: ASIC late fees apply and the register stays wrong, which misleads lenders, insurers, and anyone buying the business later.
Locked out of the portals: without the corporate key or access to the company officeholder portal you cannot lodge the Form 484 yourself, and the clock keeps running.

Where a lawyer helps

A lawyer's main value in an exit is sequencing the paperwork so nothing is missed and the deal that was agreed is the deal that is documented. A commercial lawyer will review the partnership agreement, constitution, and shareholders agreement before the departure, and tell you which provisions actually govern. If there is no agreement, a lawyer will help negotiate and draft the settlement deed that fixes the price, releases the departing person's claims, and records any restraint on competition and use of client lists or intellectual property. For companies, a lawyer will draft the share transfer instruments, buy-back resolutions, and board minutes, and can lodge the Form 484 and ABN changes on your behalf.

Where the parties cannot agree, the disputes are usually resolved through the same statutes. A departing or remaining shareholder can apply to the Court for relief where the company's conduct is oppressive or unfairly prejudicial under s 232 of the Corporations Act 2001 (Cth). An outgoing partner can pursue an account of profits or interest under s 42 of the Partnership Act. In either case, the existence of a written agreement signed before anyone left is the strongest position to be in.

The Deal Comes Before the Paperwork

The single thing most likely to determine whether the exit succeeds is whether the terms of departure were agreed and written down before the forms were touched. The statutory steps are mechanical: give notice, settle the share, cancel and reapply for the ABN, transfer or buy back the shares, lodge the resignation and the Form 484 within 28 days. None of that is complicated once the commercial terms exist. The price, the valuation date, the treatment of goodwill, and who keeps the clients are decisions that no form can make for you, and they are where exits stall and relationships curdle into disputes.

In summary: confirm the structure and read the governing documents first; for a partnership, give notice of dissolution, settle the outgoing partner's share in writing, and cancel the old ABN before applying for a new one; for a company, transfer or buy back the shares, record the director's resignation, and lodge Form 484 with ASIC within 28 days. If the partnership agreement or shareholders agreement was drafted to cover departure, most of this will already be decided, and the process becomes a matter of executing it cleanly.