How to Handle Legal Billing Disputes and Client Complaints in Australia

Billing disputes are one of the most common sources of conflict between lawyers and clients in Australia. According to the various state Legal Services Commissioners, billing complaints consistently rank among the top categories of complaints received each year. For practitioners, a billing dispute is not just an inconvenience — it can lead to costs assessments, regulatory investigations, reputational harm, and the loss of a client relationship.

This guide walks through the common causes of billing disputes, the formal resolution processes available in Australia, and — most importantly — practical steps you can take to prevent disputes from arising in the first place.

Why Billing Disputes Happen

Before addressing how to resolve disputes, it is worth understanding why they occur. In our experience, most billing complaints stem from a handful of recurring problems.

Lack of Detail in Bills

The most frequent trigger for a billing dispute is a bill that does not adequately explain what was done or why. Entries like "Work on matter — 2.5 hours" or "Correspondence — 0.6 units" tell the client almost nothing. When a client receives a bill full of vague entries and a large total at the bottom, suspicion follows naturally. Detailed billing descriptions are the single most effective defence against disputes — see our guide on how to write effective billing descriptions for practical advice on this point.

Unexpected Amounts

Clients who receive a bill significantly higher than what they expected will almost always push back, even if the work was legitimate. This usually happens when the scope of work expanded without adequate communication, or when the lawyer failed to provide interim billing updates. A client who has been receiving monthly bills of $3,000 will not blink at the next one. A client who receives a single $18,000 bill after four months of silence will pick up the phone — or worse, contact the Legal Services Commissioner.

Scope Creep Without Communication

Legal matters rarely follow a straight line. New issues emerge, the other side raises unexpected arguments, and the scope of work grows. This is normal. What is not acceptable is allowing the scope to expand without telling the client. If you estimated the matter would cost $15,000 and it is now tracking toward $30,000, the client needs to know before they get the bill — not after. Under the costs disclosure obligations, you may also be required to provide updated disclosure when costs are likely to exceed original estimates by a material amount.

Poor Communication Throughout the Matter

Billing disputes are often a symptom of a broader communication breakdown. When clients feel informed and involved, they are far more accepting of costs. When they feel left in the dark — unsure what is happening, why it is taking so long, or what the next steps are — they scrutinise the bill more closely and are quicker to complain.

Internal Resolution: What to Do When a Client Disputes a Bill

When a client raises a concern about a bill, your first instinct should be to resolve it internally. Most billing complaints never need to reach a regulator or a court if they are handled promptly and professionally.

Step 1: Review the Bill Objectively

Before responding to the client, review the bill yourself with fresh eyes. Ask whether the descriptions are clear enough for a non-lawyer to understand. Check whether any entries look excessive or duplicative. Consider whether the total is proportionate to the complexity and outcome of the matter. If you identify entries that are genuinely questionable, it is better to concede them early than to defend an indefensible position.

Step 2: Meet with the Client

Arrange a meeting — ideally face to face or by video — to discuss the client's concerns. Listen first. Many clients simply want to be heard and to understand what they are paying for. Walk them through the key items on the bill and explain the work that was done. Often, a 30-minute conversation resolves what could otherwise become a six-month regulatory process.

Step 3: Negotiate in Good Faith

If the client has legitimate concerns, be prepared to negotiate. This might mean writing off time that was genuinely excessive, offering a payment plan, or agreeing on a reduced total. Document any agreement in writing. A reasonable adjustment now is almost always preferable to a costs assessment later — both in terms of cost and professional reputation.

Step 4: Document Everything

Keep detailed records of all communications relating to the dispute: what the client raised, how you responded, what was agreed. If the matter does escalate to a formal process, your contemporaneous records will be critical evidence.

Costs Assessment in the Supreme Court

If internal resolution fails, either party can apply to the Supreme Court for a costs assessment. This is a formal process governed by the Legal Profession Uniform Law (LPUL) in NSW and Victoria, and equivalent legislation in other states.

Who Can Apply

Either the client or the law practice can apply for a costs assessment. In practice, it is almost always the client who applies, challenging the amount of a bill they consider excessive. However, a law practice can also apply — for example, to have the court confirm that the amount charged is fair and reasonable, particularly where a client is refusing to pay.

Timeframes

Under the LPUL, a client can apply for a costs assessment within 12 months of receiving the bill. After 12 months, the client needs leave of the court, which will be granted only if the court considers it just and fair in the circumstances. For the law practice, there is no statutory time limit on applying, but delay can be a relevant factor.

What the Assessor Considers

The costs assessor is appointed by the court and will review the bill in detail. The assessor considers a range of factors, including:

• Whether the work claimed was actually carried out
• Whether the work was necessary and reasonable in the context of the matter
• Whether the time recorded for each task was proportionate to its complexity
• Whether the hourly rate was appropriate given the practitioner's experience and the nature of the work
• The terms of the costs agreement between the parties
• Whether appropriate costs disclosure was provided
• The outcome of the matter and the benefit obtained by the client

The assessor can allow, reduce, or disallow individual items on the bill. In some cases, bills are reduced substantially — reductions of 20 to 40 per cent are not uncommon in contested assessments. The costs of the assessment process itself can also be significant, and the court may order one party to pay the other's assessment costs.

Importantly, a costs assessor will look closely at the quality of your time entries. Vague, block-billed, or insufficiently detailed entries are far more likely to be reduced. This is another reason why compliance with billing standards matters — not just as a regulatory obligation, but as a practical defence in costs disputes.

Legal Services Commissioner Complaint Process

Clients who are unhappy with a bill can also complain to the Legal Services Commissioner (or the equivalent body in their state — the Legal Practice Board in WA, the Legal Profession Board in Queensland, and so on). The Commissioner handles both conduct complaints and consumer disputes, and billing complaints fall squarely into both categories.

How Clients Complain

The process is straightforward for clients. In most jurisdictions, complaints can be lodged online through the Commissioner's website or by email. The complaint does not need to be in any particular format — a client simply describes their concern and provides copies of relevant bills and correspondence. There is no filing fee.

What Happens Next

Once a complaint is received, the Commissioner will typically write to the law practice seeking a response. The practice is given a set period (usually 21 to 28 days) to respond in writing. The Commissioner then assesses the complaint and may:

• Facilitate an informal resolution — the Commissioner acts as an intermediary, helping the parties reach an agreed outcome. This is the most common path for straightforward billing complaints.
• Refer the matter for costs assessment — if the dispute is about quantum and cannot be resolved informally, the Commissioner can refer it to the Supreme Court for a formal costs assessment.
• Investigate further — if the complaint raises concerns about professional conduct (for example, deliberate overcharging or misleading costs disclosure), the Commissioner may conduct a formal investigation.
• Refer to a disciplinary body — in serious cases, the matter may be referred to a disciplinary tribunal. Potential outcomes include reprimands, fines, conditions on the practitioner's practising certificate, or in extreme cases, removal from the roll.
• Dismiss the complaint — if the complaint lacks substance, the Commissioner can close the file.

Potential Outcomes

For most billing complaints, the outcome is a negotiated resolution — typically a reduction in fees or a payment plan. However, where the Commissioner identifies systemic problems (such as a pattern of overcharging or inadequate costs disclosure), the consequences can be more serious. Practitioners should take any communication from a Commissioner's office seriously and respond promptly, thoroughly, and professionally.

Prevention: How to Avoid Billing Disputes

The best billing dispute is one that never happens. Every measure you take to improve billing transparency and communication reduces the likelihood of a complaint.

Write Detailed Billing Descriptions

Every time entry should describe the specific work performed with enough detail that a client can understand what was done and why. Instead of "Review documents," write "Reviewed and annotated three witness statements (Smith, Patel, Lee) in preparation for cross-examination, identified two inconsistencies requiring follow-up." This level of detail makes it very difficult for a client to argue they did not receive value for the time billed.

Record Time Contemporaneously

Recording time at the end of the day — or worse, at the end of the week — leads to inaccurate entries that are harder to defend. Contemporaneous time recording produces more accurate records and more detailed descriptions. If you cannot record time during a task, aim to do so within the hour. The longer you wait, the less detail you will remember, and the weaker your position becomes if the bill is challenged.

Send Regular Billing Updates

Do not let costs accumulate in silence. Monthly billing is the standard in most practices, and there is good reason for it. Regular bills keep the client informed, allow them to raise concerns early, and eliminate the shock of a large unexpected invoice. Some practitioners also send informal cost updates between bills — a brief email saying "We have incurred approximately $4,500 in fees this month, primarily on the discovery process" can go a long way toward building trust.

Use Clear Costs Agreements

A well-drafted costs agreement sets expectations from the outset. It should clearly state the hourly rates, the scope of work covered, what is not included, the billing frequency, and the payment terms. It should also explain the client's right to receive itemised bills and their right to seek a costs assessment. When the scope changes, update the costs agreement or at minimum provide updated costs disclosure in writing.

Communicate Proactively About Scope Changes

When you know the matter is going to cost more than originally estimated, tell the client immediately. Explain why the scope has changed, what additional work is required, and provide an updated estimate. Get the client's instructions before proceeding. This simple step eliminates the vast majority of "unexpected amount" complaints.

How LexUnits Helps Reduce Billing Disputes

Many of the root causes of billing disputes — vague descriptions, missing detail, inconsistent entries — come down to the practical difficulty of writing good time entries under time pressure. This is exactly what LexUnits was built to address.

LexUnits uses AI to generate detailed, professional billing descriptions from minimal input. You provide a brief note about what you did, and LexUnits produces a comprehensive description that explains the work, its purpose, and its context. The result is a bill that clients can actually understand and that stands up to scrutiny in a costs assessment.

Detailed Descriptions That Withstand Assessment

In a costs assessment, the assessor reviews individual time entries and decides whether the work was necessary and the time was reasonable. Vague entries are the easiest to reduce. LexUnits-generated descriptions include the specific tasks performed, the documents or parties involved, and the purpose of the work — exactly the level of detail that assessors look for when allowing entries at full value.

Consistent Quality Across the Firm

One of the challenges in a multi-practitioner firm is maintaining consistent billing quality. Senior partners may write detailed entries while junior lawyers write vague ones — or vice versa. LexUnits standardises the quality of billing descriptions across the entire firm, which means every bill that goes out the door meets the same standard, regardless of who recorded the time.

Faster Time Recording, Better Records

Because LexUnits generates descriptions from brief notes, practitioners spend less time on billing administration. Paradoxically, spending less time on billing produces better records — because practitioners are more likely to record time promptly when the process is quick and painless. Contemporaneous recording plus AI-enhanced descriptions equals a bill that is both accurate and detailed.

Frequently Asked Questions

How long does a client have to apply for a costs assessment in NSW?

Under the Legal Profession Uniform Law, a client can apply for a costs assessment within 12 months of receiving the bill. After 12 months, leave of the court is required, and the court will consider whether it is just and fair to allow the assessment to proceed.

What happens if a client complains to the Legal Services Commissioner about my bill?

The Legal Services Commissioner will assess the complaint and may attempt to facilitate a resolution between you and the client. If the complaint cannot be resolved informally, the Commissioner may refer the matter for a costs assessment, refer it to a disciplinary body, or dismiss the complaint if it lacks substance.

What is the best way to prevent billing disputes with clients?

The most effective prevention measures include providing a clear costs agreement upfront, recording time contemporaneously with detailed descriptions, sending regular billing updates so there are no surprises, and communicating proactively when the scope of work changes. Detailed billing entries that explain the "what" and "why" of each task make it much harder for clients to challenge the reasonableness of your fees.

Can a costs assessor reduce my bill even if the client agreed to the hourly rate?

Yes. A costs assessor can reduce a bill even where the client agreed to the hourly rate. The assessor considers whether the work was necessary, whether the time spent was reasonable, and whether the costs were proportionate to the matter. Agreement on the rate does not prevent scrutiny of the amount of time billed.