How to change an employment contract in Australia

Your business has reached the point where the employment arrangements you set up no longer fit. A role is being reshaped, a site is closing, an employee has asked to move to part time, or a new policy needs to become part of the terms on which people work. Whatever the trigger, you have decided the contract needs to change, and the question is how to do that without breaching the contract itself, the Fair Work Act 2009 (Cth), or the modern award or enterprise agreement that covers the employee.

Done properly, the process ends with a signed variation agreement, or a replacement contract, that records the new terms and that both sides understand. What it does not end with is an email telling the employee their hours, pay or duties have changed from next Monday. Employers commonly assume that because they pay the wages, they can redesign the job and the employee must accept it. That assumption is wrong, and it is the source of most contract change disputes. Australian law does not allow an employer to impose a significant change by announcement, and most employees are entitled to refuse one. The lawful path runs through consultation, agreement and written documentation, and each step is set out below.

What you need before you start

Assemble the following before the first conversation with the employee:

The current written contract and anything it incorporates: the letter of offer, the contract itself, and any policies or handbooks the contract says apply. If there is no written contract, gather the emails and records that show what was agreed.
The applicable modern award or enterprise agreement: most employees are covered by one, and it will usually set the minimum terms the change cannot undercut and may impose consultation obligations. Employees who are award and agreement free still have the National Employment Standards and the Fair Work Act as their floor.
A precise statement of the change and the business reason for it: the hours, duties, location, pay, reporting line or combination of these that is proposed, and why. Vagueness at this point makes the consultation that follows much harder.
A draft of the variation agreement or new contract: preparing a draft before consultation lets you hand the employee something concrete to respond to.
Confirmation of who can sign: who in your business is authorised to enter the variation, and who must sign on the employee's side.

The item that most often trips employers up is the second one. A change that looks straightforward under the contract can trigger a consultation clause in the award, and a term of an award or enterprise agreement cannot simply be varied by agreement between you and one employee.

The steps to changing an employment contract

Step 1: Review the current contract and its flexibility clauses

Start by reading the existing contract for what it already permits. Many contracts include a clause allowing the employer to vary duties, transfer locations or adjust rosters within stated limits. Where such a clause exists and is drafted widely enough, a minor operational change may be within your existing rights and no variation document is needed at all.

Also check what the contract incorporates. If it says workplace policies apply from time to time, updating a policy such as a work from home or dress code policy may sit within your existing rights, provided the change is not used to undercut minimum entitlements or to single out an individual employee.

Step 2: Confirm what the law will not let you change

The National Employment Standards set the minimum conditions for all national system employees, covering maximum weekly hours, leave, notice of termination and redundancy pay, among other matters. Section 61 of the Fair Work Act 2009 (Cth) provides that these standards cannot be displaced, and s 55 provides that a modern award or enterprise agreement must not exclude them. The Fair Work Ombudsman puts the same point in plainer terms: an employment contract cannot remove or provide for less than an employee's minimum entitlements. The same floor applies to pay. Award and agreement free employees must be paid at least the national minimum wage, and award covered employees cannot drop below the minimum rates and conditions in their award, so a variation that reduces pay below those levels is ineffective no matter what the employee signs.

Where the employee is covered by a modern award or enterprise agreement, that instrument is the next constraint. For award covered employees, the award's flexibility term allows you and the employee to agree an individual flexibility arrangement (IFA) that varies the effect of specified award terms. The arrangement must be genuinely agreed, must be in writing and signed by both parties, and must leave the employee better off overall than they would have been without it, and a copy must be given to the employee: s 144 of the Fair Work Act 2009 (Cth). Enterprise agreements carry a similar flexibility term with similar requirements: s 203.

Step 3: Consult the employee before the change is made

Consultation is both a legal requirement and the practical heart of the process. Every modern award must include a term requiring the employer to consult about a change to an employee's regular roster or ordinary hours of work, to provide information about the change, to invite the employee's views on its impact, including on their family and caring responsibilities, and to consider those views: s 145A of the Fair Work Act 2009 (Cth). Enterprise agreements must include a consultation term covering major workplace changes and changes to regular rosters or ordinary hours: s 205.

In practice this means a genuine exchange, not a notification. Explain what is changing, why, and when it would take effect. Give the employee time to respond and to ask questions. Take their views seriously, and where a reasonable adjustment would answer their concerns, consider making it. Most modern awards also contain a consultation clause covering major workplace change, so the same discipline applies before any restructure that puts roles at risk is locked in. Record what was discussed, what concerns were raised and what was decided, because that record is what you will rely on if the change is later challenged.

Step 4: Agree the new terms and put them in writing

Once the employee agrees, document the change. The main options are:

A variation agreement: a short document that identifies the existing contract and sets out the specific clauses being amended, signed by both parties.
A new contract: the sensible option where changes are extensive, or where several amendments need to be consolidated into a single up to date document.
An individual flexibility arrangement: where the change varies a term of a modern award or enterprise agreement and the instrument's flexibility term applies.

Under general contract law, a variation needs something in exchange to be enforceable; if the employee receives nothing for agreeing, executing the variation as a deed avoids that issue. A lawyer can confirm which form suits the situation.

Do not rely on a verbal agreement. A change agreed in a corridor conversation is difficult to prove and easy to dispute. If the employee later claims the change was never agreed, or that different terms were promised, the dispute comes down to one recollection against another, and the employer usually carries the burden of showing the terms were accepted. A signed written record is the only form that gives you certainty about what was agreed and when.

Step 5: Sign, store and implement the change

Have both parties sign, give the employee a copy, and keep the signed original with the employee's personnel file. Update payroll and roster systems so the new terms take effect as agreed, and tell anyone whose work is affected. If the change comes with a transition period, diarise the start date so the new arrangements begin as promised.

Where the process typically gets held up

The process usually stalls at one of four points:

The employee refuses to sign: You cannot compel agreement to a significant change, and imposing it anyway is a breach of contract. Before moving on, treat the refusal as feedback: ask what is driving it, and consider whether a modest adjustment to the proposal would address the concern while still meeting your operational need. If genuine consultation still does not produce agreement, the realistic paths are compromise, redeployment, or restructuring the role. Where the role genuinely disappears, a redundancy may follow, but only if it is genuine: the role must no longer be required because of changes in the operational requirements of the business, any award or agreement consultation obligations must have been complied with, and redeployment within the business or an associated entity must not have been reasonable: s 389 of the Fair Work Act 2009 (Cth).
The unilateral change: Forcing a major change to pay, hours, duties or location can amount to repudiation of the contract. If the employee resigns in response, the Fair Work Commission can treat the resignation as a dismissal at the employer's initiative, and a forced resignation of this kind can support an unfair dismissal claim.
A change tied to a workplace right: If the change is made because the employee exercised a workplace right, such as requesting flexible working arrangements or raising a complaint, it can be adverse action. Adverse action includes altering the position of the employee to their prejudice, and s 340 of the Fair Work Act 2009 (Cth) protects employees who have or exercise workplace rights: s 342.
Skipping the award's consultation clause: Making a roster or hours change without the consultation the award requires can be a contravention of the award in its own right, separate from any contractual issue.

When a lawyer should be involved

Employment lawyers are most useful at the points where the risk sits. Before the change is proposed, a lawyer can confirm which award or enterprise agreement applies, whether an existing flexibility or variation clause covers the change, and whether an IFA is the right mechanism, and can check whether the proposed terms can be varied at all. During drafting, they can prepare the variation agreement or new contract so the change is enforceable, properly documented and does not accidentally undercut the National Employment Standards or the instrument. If the employee refuses, a lawyer can map the alternatives, including whether a genuine redundancy is available, and sequence the consultation and termination steps so the business does not walk into an unfair dismissal or general protections claim. For any change that touches pay, position or location, or that involves more than a handful of employees, legal input before the change is announced is usually money well spent.

The employee's informed agreement, in writing

The success of a contract change rests on one thing: the employee's informed agreement, obtained through genuine consultation and recorded in writing. Every other element of the process, the award check, the drafting, the record keeping, exists to protect that agreement from being challenged. Where the agreement is real, documented and compliant with the award and the National Employment Standards, the change holds up. Where it is assumed, forced or verbal, the business is exposed to breach of contract, unfair dismissal and adverse action claims.

The sequence to remember is: check the contract and the award first, consult before deciding, agree in writing, and never impose a significant change unilaterally. Where agreement cannot be reached, stop and take advice before restructuring, redeploying or terminating, because the steps taken at that point determine whether the business ends up protected or exposed.