STI Bonuses in Australia: How to Structure Short-term Incentives Legally

An sti bonus can be a useful way to reward performance, but many Australian businesses get the legal structure wrong. Common mistakes include promising a bonus informally in an email, calling it “discretionary” while setting hard targets that make it look guaranteed, and forgetting to deal with what happens if an employee resigns, is terminated, or is part-way through a performance period. Those gaps often create disputes right when a business is already managing budget pressure, staff turnover, or underperformance.

The main issue is that a short-term incentive is still part of the employment relationship. If the wording is unclear, a bonus plan can clash with the employment contract, create arguments about whether the bonus forms part of wages, or expose the business to claims about unfair treatment, misleading representations, or underpayment.

This guide explains what an sti bonus usually means in Australia, the legal issues to sort out before you sign, the clauses businesses often miss, and the common errors founders and managers make when rolling out incentive plans.

Overview

An sti bonus is a short-term incentive, usually tied to annual or quarterly performance, financial targets, individual KPIs, team outcomes, or a mix of those measures. It can work well when the rules are clear, documented consistently, and aligned with the employee’s contract and the way your business actually makes decisions.

The legal position usually turns on the documents, the wording used in offers and policies, and the conduct of the employer over time. A bonus labelled “discretionary” will not always stay discretionary if the surrounding facts point the other way.

• Whether the bonus is truly discretionary, partly discretionary, or earned once conditions are met
• How the bonus plan interacts with the employment contract, award, enterprise agreement, and workplace policies
• What performance measures apply, who assesses them, and when they are confirmed
• What happens if the employee starts mid-cycle, goes on leave, resigns, is terminated, or is under notice
• Whether the business has reserved a clear right to amend, replace, or withdraw the plan
• How to avoid misleading promises in offer letters, emails, recruitment conversations, and manager discussions
• Whether record-keeping and payroll treatment match the wording in your documents

What STI Bonus Means For Australian Businesses

An sti bonus is usually a cash incentive linked to performance over a short period, most often a financial year. For Australian businesses, the legal question is not just what you call the payment, but whether your documents and conduct show that the employee has a contractual entitlement to it.

In practice, short-term incentives often sit beside base salary and other benefits in senior employee contracts, management contracts, and key staff retention packages. Smaller businesses also use them for sales staff, operations managers, and team leaders where owners want variable pay tied to results.

How short-term incentives are usually structured

Most sti bonus arrangements use one of the following models:

• A fully discretionary bonus, where the business may decide whether to pay any amount at all
• A formula-based bonus, where payment follows if stated targets are met
• A mixed model, where some criteria are objective and some are subject to management discretion
• A pool model, where a bonus pool is created if the business hits financial goals and then allocated among eligible employees

Each model creates different legal risks. A fully discretionary model gives more flexibility, but it has to be drafted and managed carefully. A formula model is easier for employees to understand, but it can create stronger contractual claims if the targets are met and the business later tries not to pay.

Why the wording matters so much

The wording matters because courts and tribunals do not look only at the title of the clause. They look at the whole arrangement, including the employment contract, bonus policy, offer letter, board approvals, manager communications, and what the business has done in prior years.

This is where founders often get caught. A contract may say the sti bonus is discretionary, but the recruitment discussion may have described it as a standard 20 per cent annual entitlement, with specific targets already agreed. If the employee relies on that promise before they sign, the business may have created a problem.

Where sti bonus disputes usually come from

Most bonus disputes do not start with the plan itself. They start with a real workplace moment, such as these:

• An employee meets revenue targets but the business says profits were too low to pay bonuses
• A manager tells a new hire the bonus is “basically guaranteed” if they perform
• An employee resigns just before the payment date and claims a pro rata amount
• The business changes KPIs late in the performance year without clear contractual power to do so
• An employee on parental leave is excluded from the bonus process without proper thought about the reason
• The contract is silent on whether misconduct, notice periods, or termination affect entitlement

For SMEs, the practical lesson is simple. Before you sign a contract or circulate a bonus plan, make sure the wording reflects what the business genuinely intends to do.

Does an sti bonus form part of salary?

Sometimes yes, sometimes no. If the bonus is discretionary and properly documented as such, it may not be part of fixed salary. But if the payment becomes an enforceable entitlement under the contract or a clear formula, it may be treated as part of the employee’s contractual remuneration package.

The classification matters because it can affect termination discussions, unpaid entitlement claims, and payroll administration. It can also affect how offers are communicated to candidates. Businesses should also speak with an accountant or tax adviser about tax and superannuation treatment, because those issues depend on the structure and the payment type.

Legal Issues To Check Before You Sign

Before you sign, the key legal task is to make the bonus arrangement internally consistent. Your contract, bonus policy, offer documents, and manager communications should all describe the scheme in the same way.

1. Contract versus policy

The first issue is whether the sti bonus terms sit in the employment contract, a separate incentive plan, or both. If both documents cover the same topic but use different language, the business can accidentally create conflicting obligations.

A common approach is to keep the key framework in the contract and put the operational detail in a policy or plan rules. If you do that, the documents should clearly say:

• whether the policy is contractual or non-contractual
• which document prevails if there is inconsistency
• whether the business can amend the policy during the employment relationship

2. Discretion must be genuine

If you want the bonus to remain discretionary, the documents and the day-to-day messaging must support that. A clause that says “sole discretion” can be undermined if managers treat the payment as automatic or if targets are framed as creating an entitlement.

Discretion also should not be exercised arbitrarily, capriciously, or for an improper purpose. Even where a business retains discretion, the way it makes the decision still matters.

3. Performance measures need to be clear

A bonus scheme works best when employees know what they are being measured against. Vague references to “good performance” or “meeting expectations” invite arguments later, especially if the payment amount is significant.

Where possible, set out:

• the performance period
• the financial or operational metrics
• any individual KPIs or behavioural standards
• who decides whether targets are met
• when assessment happens
• whether the board, founder, or manager has final approval

4. Eligibility rules must cover common scenarios

The main risk is leaving out the practical situations that regularly arise in growing businesses. Employees change roles, start mid-year, go on leave, or leave before the payment date. If the plan does not deal with those scenarios, disputes are much more likely.

Your eligibility wording should address:

• new starters and whether bonuses are pro rated
• employees on probation
• employees on unpaid leave, parental leave, or other extended absence
• employees who resign or are terminated before assessment or payment
• employees who are under notice
• employees dismissed for serious misconduct

5. Variation and withdrawal rights

Businesses often need flexibility to change incentive settings when budgets tighten, strategy changes, or a role is redefined. But changing a bonus arrangement is easier if the documents expressly allow for amendment, replacement, suspension, or withdrawal.

Even then, there are limits. A broad variation clause is not a licence to rewrite accrued rights after an employee has already met the conditions. If a payment has already been earned under the contract, the business may not be able to take it away.

6. Fair Work Act, awards, and minimum entitlements

An sti bonus does not remove the need to comply with the Fair Work Act 2009, modern awards, enterprise agreements, and the National Employment Standards. For some employees, award coverage and minimum pay rules still matter even if they are also bonus-eligible.

Before you hire your first worker on an incentive-heavy package, check whether the employee is award covered, whether annualised salary rules are relevant, and whether your pay structure still meets minimum entitlements in every pay period where required.

7. Misleading recruitment statements

Recruitment conversations can create legal exposure if they overstate the certainty or likely value of the bonus. Founders and hiring managers sometimes use target bonus figures to attract candidates, then later say the scheme was discretionary all along.

Before you rely on a verbal promise, ask whether it matches the written terms of the employment contract. If it does not, fix the documents and coach the manager team on how to describe the scheme consistently.

8. Record-keeping and decision-making process

A well-drafted plan is only part of the answer. You also need records showing how the business assessed performance and applied discretion.

Useful records include:

• approved KPI documents and scorecards
• board or management approval records
• written reasons where discretion materially changes the outcome
• communications to the employee about targets and results
• payroll records showing the amount and timing of payment

Common Mistakes With STI Bonus

Most sti bonus problems come from mismatch. The contract says one thing, the manager says another, and the business operates the scheme differently again.

Using recycled clauses from another business

A generic bonus clause copied from an old contract often misses the reality of your business. A startup with shifting budgets and changing roles may need different discretion and eligibility wording from a mature business with a fixed annual review cycle.

Before you accept the provider's standard terms or reuse a template, check whether the clause actually reflects how bonuses are approved and paid in your business.

Calling the bonus discretionary but making it automatic

This is one of the most common contract drafting mistakes. If the clause says payment is discretionary but the formula guarantees payment once numbers are hit, the business may struggle to argue later that it had a free choice.

If you want a mixed model, say so clearly. Identify which parts are objective and which parts remain subject to final approval or broader business conditions.

Failing to deal with resignation and termination

Employees often challenge bonus decisions when they leave. If the documents do not explain what happens when someone resigns before payment, is terminated without cause, or works part of the performance year, the business may face a grey area.

Clear drafting usually addresses whether the employee must be actively employed on the payment date, whether notice affects eligibility, and whether any pro rata payment can be made.

Changing KPIs halfway through the year without a clear right

Businesses sometimes adjust targets because the market changes or the role changes. That can be commercially sensible, but it still needs to be handled lawfully and consistently with the contract.

If the business wants flexibility, build it in from the start and communicate changes properly. A late change made only after performance improves or worsens is more likely to be challenged.

Leaving too much to manager discretion

Local manager discretion can create inconsistency, favouritism concerns, and poor records. It can also increase risk where protected attributes, leave status, or interpersonal conflict appear to influence decisions.

A better approach is to define the assessment criteria, approval pathway, and documentation requirements centrally, even if line managers contribute input.

Ignoring discrimination and adverse action risks

Bonus decisions can create employment claims if they are influenced by prohibited reasons. For example, reducing or withholding an sti bonus because an employee exercised a workplace right, took parental leave, made a complaint, or had a protected attribute may create significant risk.

You do not need to list every legal issue in the plan, but decision-makers should understand that bonus discretion is not unlimited. This matters most before performance reviews, restructures, and exits.

Overpromising in offer letters

Offer letters should be precise about target bonus opportunity and the conditions attached to it. A statement like “you will receive an annual sti bonus of 15 per cent” means something very different from “you may be eligible to be considered for an annual sti bonus of up to 15 per cent, subject to the plan rules and company discretion”.

That difference matters before you sign, especially for senior hires negotiating total package value.

Not reviewing the scheme as the business grows

An incentive model that worked with five staff may stop working with fifty. New reporting lines, investor expectations, multiple business units, and more formal budgets all change how a bonus plan should be drafted and administered.

Review the scheme when you promote key staff, introduce executive roles, expand interstate, or move from founder-led approvals to a management team or board process.

FAQs

Is an sti bonus always discretionary?

No. Some short-term incentives are fully discretionary, but others become contractual entitlements if the documents say payment follows when stated conditions are met.

Can we refuse to pay an sti bonus if the employee resigns before the payment date?

Sometimes, if your contract or plan clearly says the employee must be employed and meet any other eligibility conditions on the payment date. If the documents are unclear, the answer may be less certain.

Should the bonus terms be in the employment contract or a separate policy?

Either can work, but the documents must align. Many businesses put the overall framework in the contract and the detailed mechanics in a policy or incentive plan.

Can we change KPI targets during the performance year?

Possibly, but only if your documents allow it and the change is handled consistently and fairly. Trying to change targets after performance has already occurred can create disputes.

Do we need to think about awards and minimum pay rules if an employee gets bonuses?

Yes. A bonus sits on top of, not instead of, your obligations under the Fair Work Act, any applicable award, enterprise agreement, and the National Employment Standards.

Key Takeaways

• An sti bonus can be discretionary, formula-based, or a mix of both, but the legal effect depends on the wording and how the business actually operates the scheme.
• Your employment contract, bonus policy, offer letter, and manager communications should all describe the incentive consistently.
• Clear eligibility rules are essential, especially for resignation, termination, notice periods, leave, new starters, and pro rata scenarios.
• A “discretionary” label is not enough if the surrounding promises and conduct make the payment look guaranteed.
• Performance measures, approval pathways, and record-keeping should be documented before you sign and before the performance period starts.
• Bonus decisions can still create risk under general employment law principles, including minimum entitlements, adverse action, and discrimination issues.

If you want help with contract drafting, bonus plan rules, employment contract consistency, termination and eligibility clauses, you can reach us on 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.