Custom Software for NZ Law Firms: Time Billing, Trust Accounting, and Client Portals

Law firms have software requirements that are genuinely different from almost any other professional services firm. Trust accounting rules that carry serious regulatory consequences. Time billing in six-minute units. Matter management where a missed critical date can mean a missed limitation period and a professional negligence claim. AML/CFT obligations that apply to a significant portion of the work most firms do. Confidentiality obligations that make the casual use of email for document exchange a real risk.

Off-the-shelf legal practice management software — tools like LEAP, Actionstep, or Aderant — handles much of this reasonably well for typical general practice work. But every firm has workflow specifics, billing structures, and compliance requirements that standard software approximates rather than fits. For firms with specific practice areas (property, trusts, immigration, family law), or with particular size and structure characteristics, the gaps can be significant.

This article covers what a well-designed custom system for a NZ law firm should handle: time recording, trust accounting, matter management, client portal, billing and invoicing, and the AML/CFT compliance obligations that apply to most of the services NZ law firms provide.

Time Recording: Six-Minute Units and the Recovery Rate Problem

The six-minute billing unit is standard across NZ law firms. It's aligned with how time is assessed in standard cost applications, and it's the unit used by most NZ fee schedules. Each unit represents one-tenth of an hour — so a fee earner recording at $350/hour per unit charges $35 per six-minute unit.

The practical challenge isn't understanding the unit — it's capturing time accurately and consistently. Fee earners who record time at the end of the day understate their hours. Those who record at the end of the week are essentially guessing. The research on time recording consistently shows that real-time or near-real-time capture produces materially higher WIP levels than end-of-day capture — not because fee earners are working more, but because less time is forgotten.

A custom time recording module for a NZ law firm needs to address this at the interface level:

Fast, frictionless entry. The time entry interface needs to be genuinely quick to use — matter selection by code or client name autocomplete, task code selection, a description field, and a unit count. A running timer that the fee earner can start at the beginning of a task and stop at the end — with the system automatically converting elapsed time to billing units — reduces the cognitive load of time recording to near zero. Mobile-friendly entry matters for fee earners who work outside the office on property transactions, court appearances, or client visits.

Unit-based and decimal entry. Some fee earners think in units (1.5 units = 9 minutes), others in minutes, others in hours. The system should accept all three and convert automatically. This sounds minor but makes adoption significantly easier.

Matter-level and task-level allocation. Time is recorded against a specific matter (not just a client) and against a specific task code (file review, correspondence, research, court attendance, drafting, attendances). Task-level granularity makes WIP reports meaningful — it's the difference between knowing a matter has 12 hours of WIP and knowing exactly where those hours went, which matters for both billing decisions and future matter estimation.

WIP reporting. The system maintains a live WIP ledger by matter and by fee earner. Partners can run WIP reports at any time — sorted by matter, by client, by fee earner, by age of WIP. WIP that's been sitting for more than 60 days is highlighted. This is the core management report that drives billing decisions.

Write-up/write-down workflow. Before billing, partners adjust time — writing up for exceptional results (a result achieved significantly faster than the client would have expected) or writing down where the matter ran over estimate and the client shouldn't bear the full cost. In a custom system, these adjustments are captured with a mandatory reason code. Over time, this data shows which matter types consistently produce write-offs, which is valuable for estimating and pricing future work.

Fee earner productivity reporting. Utilisation rates (billable hours as a proportion of total hours), recovery rates (billed amount as a proportion of WIP), and realization rates (collected amount as a proportion of billed) are the three metrics that tell partners whether each fee earner is performing and whether the firm's pricing is appropriate. A custom system surfaces these metrics by fee earner, by matter type, and across the firm.

Trust Accounting: Law Society Rules and Getting Them Right

Trust accounting is where software failures in a law firm become regulatory failures. The Lawyers and Conveyancers Act 2006 and the Trust Account Regulations 2008 set out specific requirements for how client trust funds must be held, recorded, and reconciled. The Law Society conducts inspection visits — and when they find problems, the consequences range from formal requirements to fix deficiencies through to disciplinary proceedings for serious breaches.

The core requirements are straightforward in principle but exacting in execution:

Client trust ledgers. Every matter where client money is held must have an individual trust ledger. Every receipt into the trust account and every payment out must be recorded against the correct matter ledger on the day it occurs. The aggregate of all matter ledger balances must reconcile to the trust bank account balance. There is no tolerance for timing differences.

Trust-to-office transfers. When fees are earned and an invoice has been rendered, the firm can transfer the amount owing from the client's trust ledger to the office account. This transfer must be authorised, must correspond to an invoice, and must not exceed the balance in the client's trust ledger. A custom system enforces these rules structurally — a transfer that would overdraw a client ledger is blocked, not just warned about.

Monthly reconciliation. The trust account must be reconciled monthly: the sum of all matter ledger balances must equal the trust bank statement balance. This reconciliation must be completed promptly and retained. In a custom system, the monthly reconciliation is a structured workflow — the system calculates the expected balance, compares it to the bank statement total (entered manually or via bank feed), and identifies any discrepancies. The completed reconciliation is signed off by the responsible person and stored with an audit trail.

Annual trust account audit. Trust accounts must be audited annually by an independent auditor. A custom system that maintains a complete, accurate transaction history with full audit trails — who entered what, when, and with what authorisation — makes the annual audit process significantly faster and less expensive than one where the auditor has to reconstruct records from incomplete sources.

Law Society inspection readiness. The Law Society can inspect trust accounting records at any time. A custom system that maintains complete records in a structured, searchable format — rather than across physical files, spreadsheets, and accounting software — means you can produce what an inspector asks for in minutes rather than hours. The inspection readiness dividend alone often justifies the investment in proper trust accounting software.

Interest-bearing trust accounts. For significant trust balances held for extended periods (common in estate administration and long property transactions), the firm may be required to place funds in interest-bearing accounts. A custom system tracks which matters have funds in interest-bearing accounts, the interest accrued, and the appropriate treatment of that interest.

Matter Management: The Infrastructure of Legal Practice

A matter in a law firm is more than a file. It's a relationship with a client, a set of legal obligations, a collection of documents with version histories, a list of tasks with deadlines, a record of communications, and a set of critical dates that — if missed — can have serious consequences for the client and the firm.

Matter opening workflow. When a new matter is opened, the system captures the essential information: client details, matter type, supervising partner, responsible fee earner, engagement details, and applicable retainer or fee arrangement. For each matter type, there's a standard opening checklist — engagement letter sent, conflict check completed, AML/KYC CDD initiated, source of funds confirmed where relevant. The matter doesn't progress until the opening checklist is complete.

Conflict checking. A conflict check is one of the most fundamental risk management steps in opening a new matter. The system searches existing clients, matters, and parties (including opposing parties and witnesses from previous matters) for any connection to the new client or matter. The search result is documented — either "no conflict identified" with the search parameters, or "conflict identified, reviewed by [partner], resolved as follows." This documentation is important if a conflict is ever queried later.

Critical date tracking. Every matter type has critical dates — limitation periods, filing deadlines, option exercise dates, settlement dates, lease renewal dates, tax filing obligations for trust matters. A custom system maintains a matter-level dates register and surfaces upcoming critical dates in the practice dashboard and in individual fee earner task lists. Missed critical dates are one of the most common sources of professional negligence claims against NZ law firms. A system that makes it structurally difficult to miss them is worth a significant amount in risk reduction.

Task checklists by matter type. Property transactions, estate administration, company incorporations, employment matters, family law proceedings — each matter type has a standard sequence of steps. A custom system maintains configurable task checklists for each matter type, with tasks assigned to specific fee earners and due dates set relative to key milestones (e.g., "request LIM — 5 business days after signed agreement"). The checklist tracks completion, so the matter status is always visible without needing to open every document.

Document management with version control. All documents for a matter are stored against the matter record — drafts, final versions, client correspondence, court documents, search results, and titles. Version control means that when a document is updated, the previous version is retained. You can always see what the document looked like at any point in time, which matters in litigation and in situations where a client later disputes what they agreed to.

Matter status dashboard. Partners need visibility across all open matters without having to open each file. The matter dashboard shows current stage, next critical date, fee earner responsible, WIP to date, and any outstanding tasks that are overdue. Filtering by matter type, fee earner, or status lets partners quickly identify where attention is needed.

Client Portal: Secure Sharing Without Emailing Sensitive Documents

The legal industry has been slow to move away from email as the default channel for client communication. The problem is well-understood: email is not secure, attachments can be forwarded, and once a document leaves the firm's systems via email, there's no control over where it goes. For confidential legal documents — executed deeds, trust documents, family court filings, immigration paperwork, employment matters — this is a genuine risk.

A client portal addresses this directly:

Secure document sharing. Documents are shared through the portal, not emailed as attachments. The client logs in to access them. Access is logged — the system records when a document was accessed, by whom, and from what device. If a document is shared with multiple parties (e.g., both parties to a property transaction), access can be controlled at the document level.

E-signature for deeds and agreements. NZ's Contract and Commercial Law Act 2017 recognises electronic signatures as legally effective in most circumstances. A custom portal with built-in e-signature capability lets clients execute deeds, retainer agreements, trust deeds, and other documents without printing, signing by hand, and scanning. The executed document is automatically stored against the matter, the signature event is timestamped and auditable, and the process is faster for both the client and the firm.

Matter progress visibility. Clients want to know what's happening with their matter. "It's in progress" is not a satisfying answer when someone is waiting on a settlement or a will to be probated. A portal that shows the current stage of the matter — "searches ordered", "finance condition satisfied", "documents at Land Information NZ" — reduces the call volume that admin staff handle while genuinely improving the client experience.

Billing visibility and invoice access. Clients can see their invoices through the portal, query individual items, and make payment. For clients on retainer arrangements or fixed-fee agreements, the portal shows how the retainer is being utilised. This transparency reduces billing disputes and builds the trust that underpins long-term client relationships.

Billing and Invoicing: From WIP to Collected Revenue

The billing process in a law firm has multiple steps that are each relatively simple individually but collectively time-consuming when done manually. WIP is reviewed and adjusted. Bills are drafted. Disbursements are added. Bills are reviewed and approved by the responsible partner. Bills are rendered and delivered. Payment is tracked and followed up. Trust-to-office transfers are processed when funds are held in trust.

Bill generation from time entries. The billing workflow starts with the matter's unbilled time entries. The system groups them by date and task, applies any write-ups or write-downs, calculates the total, and generates a draft bill. The bill format can reflect the firm's standard style — detailed (listing each time entry) or summary (listing the work done, not the individual entries). The draft is presented to the partner for review before it's finalised.

Disbursement tracking. Disbursements — court filing fees, LINZ registration fees, search fees, counsel fees, expert witness costs — are tracked against matters as they're incurred and included in the bill automatically. This eliminates the common situation where disbursements are forgotten at billing time because they were incurred weeks earlier and nobody recorded them against the matter.

Xero integration. Approved bills push to Xero for accounts receivable management. The debtor ledger in Xero reflects the true position — no need to manually re-enter invoice details. Payment recording, credit notes, and write-offs all flow from the practice system to Xero, keeping both systems in sync.

Trust-to-office billing workflow. When a client holds funds in trust and an invoice has been rendered, the system facilitates the trust-to-office transfer: it confirms the client's trust balance, calculates the amount to transfer (limited to the invoice amount or the trust balance, whichever is lower), and generates the transfer documentation. The transfer is authorised by the appropriate partner, recorded in both the trust ledger and the office accounts, and linked to the invoice.

Debtors management. Outstanding invoices are tracked in the system with aging. Automated reminder sequences — at 14, 30, and 60 days — reduce the manual debtor follow-up burden. Accounts that reach 90 days without payment or communication are flagged for partner attention. For clients on payment plans, the system tracks instalments and flags missed payments.

AML/CFT Compliance: Phase 1 Obligations for Law Firms

Law firms were among the first professional services firms brought into the NZ AML/CFT regime. As Phase 1 entities under the Anti-Money Laundering and Countering Financing of Terrorism Act 2009, law firms providing specified services — including conveyancing, company and trust formation, managing client money and assets, and certain financial services — must comply with the full CDD regime. The Law Society is the AML/CFT supervisor.

For a law firm that does property conveyancing, estate administration, trust establishment, or company work, the reality is that almost every matter triggers AML/CFT obligations. This makes it particularly important that the CDD workflow is integrated into matter management — not a separate process that runs in parallel and gets forgotten.

CDD integrated into matter opening. When a new matter is opened, the system automatically determines whether AML/CFT CDD is required based on the matter type. If it is, the CDD workflow is initiated as part of the matter opening checklist — it's not possible to mark the matter as open without confirming that CDD has been initiated. For existing clients with current CDD on file, the system confirms whether the existing CDD is adequate for the new matter type.

Identity verification and beneficial ownership. For property transactions, trust establishment, and company matters, clients upload identity documents through the portal. For trust and company clients, the system prompts the collection of beneficial ownership information — identifying every natural person who owns or controls more than 25% of the entity. All verifications are timestamped and linked to the matter record.

Source of funds verification. For property transactions and trust funding, the AML/CFT Act requires verification of the source of funds. The system prompts collection of source of funds documentation — sale proceeds, inheritance documentation, income records, bank statements — and stores this against the matter. Where the source of funds is complex or involves overseas funds, the system flags for enhanced due diligence review.

Risk rating and enhanced due diligence. Each client is risk-rated based on entity type, business activity, jurisdiction, and transaction characteristics. High-risk clients require enhanced due diligence — additional documentation, senior partner sign-off, and more frequent monitoring. The risk rating is documented and auditable, so the Law Society can see both the rating and the basis for it.

Seven-year retention. AML/CFT records must be kept for 7 years from the end of the business relationship. The system enforces this retention policy — records cannot be deleted within the retention period — and provides a clear archive for older matters that have been closed. This matters particularly for property matters, where the client relationship may end at settlement and the 7-year clock starts from that date.

NZ-Specific Integrations: LINZ, Companies Office, and IRD

A custom system built for NZ law firms can be designed around the specific systems and registries that NZ lawyers work with daily:

Land Information New Zealand (LINZ). Conveyancing work involves regular interaction with LINZ — title searches, registration of instruments, LIM requests (via councils), and the electronic workspace (e-dealing) system. A custom system can integrate with LINZ's API to pull title search results directly into the matter file, pre-populate registration forms, and track instrument registration status. For high- volume conveyancing practices, this integration alone can save significant time per transaction.

Companies Office. Company work involves regular Companies Office searches — director and shareholder checks, company status verification, and annual return tracking. A custom system can pull Companies Office records via the New Zealand Business Number (NZBN) register API, pre-populate matter details from official records, and track upcoming annual return obligations for company clients. This also feeds into the conflict check process — related parties identified in Companies Office records can be checked against the firm's conflict database automatically.

IRD number verification for trusts. Trust matters require IRD number verification — both for the trust itself and, in some cases, for beneficiaries. The system can support the documentation of IRD number collection and verification as part of trust matter management, and can flag where IRD numbers are outstanding or unverified. This is particularly relevant in the context of the AML/CFT source of funds requirements and the tax transparency obligations that apply to NZ trusts under the Taxation (Annual Rates for 2021–22, GST, and Remedial Matters) Act 2022, which introduced enhanced disclosure requirements for trusts.

Court filing systems. For litigation practices, the ability to track court filings, hearing dates, and judgment delivery dates within the matter management system reduces the reliance on separate calendar systems. Critical dates from filed documents can be pulled into the matter's critical date register automatically.

Privacy Act 2020 and Legal Professional Privilege

Law firms operate under two distinct but related obligations around client information. The Privacy Act 2020 applies to personal information collected and held about individuals — clients, employees, third parties. Legal professional privilege applies to confidential communications between lawyer and client. Both have implications for how a custom system should be designed.

From a Privacy Act perspective, a custom system should store data in NZ or in jurisdictions with equivalent privacy protections, implement access controls that restrict access to matter information to those who need it, maintain audit logs of access to sensitive information, and support the obligation to respond to access requests within the required timeframe. The Privacy Commissioner's guidance on cloud storage and the APP framework for data minimisation are both relevant design inputs.

Legal professional privilege creates an additional layer of sensitivity around legal advice documents — these records may be protected from disclosure in litigation and should not be accessible to any third party (including the software vendor) without appropriate authorisation. A custom system built for a law firm should be designed with clear data sovereignty — the firm owns and controls its data, and the system architecture prevents unauthorised access.

The Cost of Not Having the Right System

The cost of inadequate practice management systems in a law firm is real but often hidden. Time that isn't captured because recording it is too cumbersome. Billing that's delayed because WIP is spread across multiple systems and no one has a complete picture. Trust accounting issues that aren't discovered until the Law Society inspector finds them. Missed limitation periods because a critical date wasn't tracked in a system that anyone regularly checks. AML/CFT records that can't be produced because they're scattered across email, spreadsheets, and physical files.

For NZ law firms, the regulatory consequences of system failures can be severe — trust accounting breaches are among the most serious matters the Law Society deals with, and AML/CFT compliance failures are increasingly attracting enforcement attention. The investment in a system that enforces correct workflows structurally, rather than relying on individual compliance, has a clear risk reduction value in addition to the efficiency gains.

If you're running a NZ law firm and your current system is creating manual work rather than eliminating it, I'd be happy to talk through what a purpose-built system might look like. The right starting point is understanding where your firm's specific friction actually is — which is different for every practice.