Western Australia Commercial Late Fees and Interest

Unlike Western Australia's residential tenancy laws—which completely prohibit late rent fees—commercial tenancies operate under a different framework where late payment penalties are generally permissible, provided they are stipulated in the lease agreement and comply with the relevant legislation.

Disclaimer: This guide provides general legal information for educational purposes only and does not constitute legal advice. Always consult a licensed legal practitioner in Western Australia for guidance specific to your business situation. Information last verified: March 2026.

Retail Shop Leases

For leases governed by the Commercial Tenancy (Retail Shops) Agreements Act 1985, any late fee or interest provision must be:

• Clearly stated in the lease agreement.
• Not unconscionable — the Act prohibits unconscionable conduct in commercial dealings.
• Disclosed in the pre-lease disclosure statement.

Common Late Fee Structures

Protections for Retail Tenants

The Retail Shops Act provides retail tenants with protections against excessive or unconscionable charges. A late fee provision that is deemed to impose a penalty (rather than a genuine pre-estimate of the landlord's loss) may be struck down by the court.

The Small Business Development Corporation can assist with mediating disputes over late fee charges, and the State Administrative Tribunal (SAT) can make binding determinations.

Non-Retail Commercial Leases

For commercial leases outside the Retail Shops Act, late fee provisions are governed entirely by the lease agreement and general contract law.

Landlords have significantly more latitude in structuring late payment penalties for non-retail tenancies. Common provisions include:

Default Interest

The most common mechanism—interest accrues on any overdue amounts at a rate specified in the lease. Rates of 10% to 15% per annum are typical, though they must not be so high as to constitute an unenforceable penalty at law.

Compounding

Some leases provide for compounding interest (interest on interest) on overdue amounts. This must be specifically stated in the lease to be enforceable.

Recovery of Costs

Many leases allow the landlord to recover debt collection costs, including legal fees and agent charges, from the tenant if rent remains unpaid beyond a specified period.

Penalty vs. Genuine Pre-Estimate

Under Australian contract law, a late fee clause will only be enforced if it represents a genuine pre-estimate of loss suffered by the landlord due to late payment. A clause that imposes a charge out of all proportion to the landlord's actual loss may be deemed an unenforceable penalty.

To protect the enforceability of your late fee clause:

• Keep the interest rate within a reasonable range relative to prevailing commercial lending rates.
• Ensure the clause is proportionate to the likely consequences of breach.
• Document the rationale for the chosen rate as part of the lease negotiation process.

Best Practices for WA Commercial Landlords

1. Define late payment terms precisely in the lease: Specify the due date, grace period (if any), the interest rate, and when it begins to accrue.
2. Disclose in the disclosure statement: For retail leases, any interest or late fee provisions must appear in the pre-lease disclosure.
3. Act consistently: Apply late fee provisions uniformly across all tenants to avoid claims of discrimination or unfair treatment.
4. Communicate early: A prompt reminder often resolves late payments before interest needs to be applied.

How Landager Helps

Calculating default interest across multiple tenants with different lease terms is complex and error-prone. Landager's commercial ledger automatically calculates outstanding balances, applies the lease-specific interest rate from the due date, and generates statements showing the tenant exactly how the arrears have been calculated—keeping your accounts accurate and audit-ready.

Back to Western Australia Commercial Property Laws Overview.