06 Nov 2026 · commercial-law

How alternate directors work under the Corporations Act

How alternate directors work under the Corporations Act: who can appoint one, what powers they hold, the duties that apply, and the ASIC notices required.

Tyler Wright
Tyler Wright Principal Lawyer

An experienced commercial, technology, cyber, privacy lawyer, Tyler acts for corporate technology enterprises of all sizes as well as individuals navigating the law in the face of technological change.

  1. Who is involved
  2. The default rule is a replaceable rule
  3. From decision to a valid appointment
  4. While the alternate is acting: powers, duties and liability
  5. Alternate director, proxy, or power of attorney
  6. Where the arrangement goes wrong
  7. When a lawyer earns their fee
  8. The paperwork is the arrangement

An alternate director is a stand-in. A director who will be unavailable for a period, whether for travel, illness, leave, or a temporary step back, can appoint someone else to exercise some or all of their powers as a director in the meantime. The arrangement exists because governance cannot always pause: contracts still need signing, board approvals still need to happen, and lenders and investors still expect decisions to be made.

The mechanism is set out in s 201K of the Corporations Act 2001 (Cth) (the Act), supported by the company's own constitution and by notification obligations to ASIC. This article walks through how the arrangement actually operates: who is involved, what triggers a valid appointment, what the alternate can and cannot do, the duties that attach while they are acting, and the traps that turn a useful stand-in into a governance problem. It matters most for startups and SMEs with small boards, where one unavailable director can stall the whole company.

Who is involved

An alternate director arrangement involves a small cast of players, each with a different role:

  • The appointing director: holds the office and chooses the alternate. Under the default rule they can terminate the appointment at any time.
  • The alternate: the person appointed to step in. While acting they are treated as a director for the purposes of the Act, and they must hold their own director ID.
  • The board: the other directors must approve the appointment under the default rule, and the company must keep the paperwork and give the alternate notice of meetings when asked.
  • ASIC: must be notified of the appointment, of any change to the alternate's details, and in many cases of the end of the role, within 28 days.
  • Third parties: banks, suppliers and counterparties who rely on the alternate's authority to sign or approve things. Their willingness to deal with the arrangement depends on the paperwork being right.

The default rule is a replaceable rule

Section 201K of the Act is a replaceable rule. That label matters. Replaceable rules apply automatically to companies registered after 1 July 1998, but a company's constitution can displace or modify them (s 135). The first question for any company is therefore not "what does the Act say" but "what does our constitution say". Many tailored constitutions set their own conditions for alternate appointments: who approves them, how long they can run, and what powers the alternate can hold.

Where s 201K does apply, the mechanics are:

  • A director may appoint an alternate with the other directors' approval (s 201K(1)). The alternate can be given some or all of the appointing director's powers, for a specified period.
  • If the appointing director asks, the company must give the alternate notice of directors' meetings (s 201K(2)).
  • When the alternate exercises the director's powers, the act is just as effective as if the appointing director had done it (s 201K(3)).
  • The appointing director may terminate the appointment at any time (s 201K(4)).
  • The appointment and any termination must be in writing, with a copy given to the company (s 201K(5)).

One limitation is worth noting before planning around this rule: a replaceable rule like s 201K does not apply to a proprietary company while the same person is both its sole director and sole shareholder (s 135(1)). A single-founder company therefore needs an express constitution provision to create an alternate director mechanism; it cannot rely on the default rule.

From decision to a valid appointment

The steps, in the order they usually happen:

  1. Check the constitution and any shareholders agreement: Confirm whether alternates are permitted and what conditions apply. If the company relies on replaceable rules, confirm nothing has displaced s 201K.
  2. Secure the other directors' approval: Under the default rule the appointment needs the approval of the other directors. Record it in a board resolution or the minutes.
  3. Put the appointment in writing: The appointment document should name the appointing director and the alternate, state the period or the event that ends the role, and specify the powers being delegated. ASIC's guidance lists the details the appointment should contain: full name and any former names, date and place of birth, residential address, date of appointment, and the terms of the role, including whether the alternate may sign instruments and attend meetings.
  4. Confirm the alternate has a director ID: ASIC requires an alternate director to hold their own director identification number.
  5. Keep the records: The company must keep a copy of the appointment. It is prudent to also hold the alternate's signed consent to act, in line with the consent requirement that applies to director appointments (s 201D), and to keep the board minutes.
  6. Notify ASIC within 28 days: Section 205B(2) of the Act requires the company to lodge notice of the alternate's personal details and the terms of their appointment within 28 days, in the prescribed form. ASIC's Company officeholder portal is the lodgement channel. Lodging late attracts a late fee, and failing to lodge is a strict liability offence (s 205B(7)).

The notification obligations continue while the arrangement runs. The company must notify ASIC of any change in the alternate's personal details within 28 days (s 205B(4)), and when the alternate stops being an alternate (s 205B(5)). There is an important exception: if the alternate's role ended in accordance with the terms of the appointment, such as at a fixed end date, no cessation notice is required (s 205B(6)). Where there is no set end date, the company must notify ASIC within 28 days of the role ending, and the cessation date ASIC records can depend on how quickly the company lodges.

While the alternate is acting: powers, duties and liability

The defining feature of an alternate director, and the point that separates it from a mere authority to sign, is that an acting alternate is a director for the purposes of the Act. The Act's definition of "director" includes a person appointed to the position of an alternate director who is acting in that capacity (s 9AC(1)(a)(ii)).

That has two consequences.

First, powers. While acting, the alternate exercises the appointing director's powers with full effect (s 201K(3)). They can attend and vote at board meetings, and an acting alternate counts as a director when the company executes documents. Under s 127 of the Act, a company can execute a document without a common seal if it is signed by two directors, or by a director and the company secretary, with a special rule for sole director proprietary companies. An acting alternate can be one of those signatures, which is often exactly what a two-person board needs while one director is away.

Second, exposure. While acting, the alternate is subject to the same duties as any director, including the duties to exercise care and diligence (s 180), to act in good faith in the best interests of the company and for proper purposes (s 181), and not to improperly use their position (s 182) or information obtained through it (s 183). Dishonest or reckless breaches can be criminal offences (s 184). The point is practical: the person stepping in carries real personal liability for the decisions they make, which is why the appointment should never be a favour handed to someone who does not understand the company's position.

Alternate director, proxy, or power of attorney

Three tools get confused, and they do different jobs:

  • Alternate director: acts as a director at board level, and carries director duties and liabilities while acting. This is the mechanism under s 201K.
  • Proxy: under s 249X, a member can appoint a proxy to attend and vote at a meeting of members. A proxy operates at shareholder level, not board level.
  • Power of attorney: an authority to sign documents and do certain acts on someone's behalf. It does not make the person a director or attract director duties.

If the goal is to keep the board functioning while a director is away, an alternate director is the mechanism that fits. If the goal is simply to get documents signed, a power of attorney may be enough. Knowing which one the situation calls for avoids building a governance structure where an authority would do.

Where the arrangement goes wrong

The recurring problems in small company governance are the predictable ones:

  • The handshake appointment: An appointment that is not in writing is not valid under s 201K(5). Worse, someone who acts as a director without a valid appointment can still be treated as a director (s 9AC(1)(b)), with the duties that come with it, while the company has no clean record of their authority.
  • Vague scope: If the appointment does not say which powers are delegated, or for how long, third parties can be reluctant to accept signatures, and the alternate can make decisions the appointing director never intended. Specify the period and the limits.
  • Sole director companies: With no other directors to give approval, and no replaceable rule applying, a single-director company needs a constitution that provides for alternates. If it does not, the appointment has no statutory footing.
  • Removal surprises: Removing the appointing director does not remove the alternate; they remain in office unless separately removed. And a company must always have at least one director, so an alternate cannot be removed if they are the only director left.
  • Missed or late ASIC notices: A late lodgement attracts a late fee, and if a no-end-date appointment finishes and the company lodges late, ASIC records a later cessation date than the true one, which can surface in later due diligence.
  • Conflicts: Alternates are often chosen from outside the business, or from related entities. While acting they owe the company the same duties, including the duty to manage conflicts, which is worth documenting when the alternate has other business interests.

When a lawyer earns their fee

The cheap parts of an alternate director appointment are the form-filling and the minutes. The parts worth advice are the design decisions. A corporate lawyer can help with:

  • drafting or amending the constitution so the alternate mechanism actually works for a single-director company or a group structure;
  • setting the scope of the appointment so the alternate has enough authority to keep the business moving without unintended exposure;
  • checking the ASIC lodgements and their timing, particularly for time-limited appointments, overseas appointees, or alternates who hold multiple roles;
  • advising the alternate on the duties they will carry while acting; and
  • tidying the records before fundraising, finance, or a sale, where an informal appointment can become a due diligence problem.

The paperwork is the arrangement

The alternate director mechanism only works when the documentation and the ASIC trail are complete. The mistake that costs the most is rarely the choice of person; it is the appointment that was never properly recorded, or the notice that was never lodged, surfacing months later in a dispute over who had authority to sign a contract or in a due diligence process. Both are cheap to get right at the time: a written appointment with a clear scope, a board approval on file, and a notice to ASIC within 28 days. A short conversation with a lawyer before the appointment can confirm which parts apply to your company, and it is far less expensive than unpicking an informal arrangement later.