Architecture and engineering firms are high-skill professional services businesses with a revenue recognition challenge that differs from both consulting (where services are rendered continuously) and construction (where projects are physical). The service is bespoke, the billing is event-driven, and the gap between work performed and cash received can be substantial. Add the complexity of consultant disbursements, fixed-fee over-runs, and professional indemnity prepayments, and you have an engagement that rewards a bookkeeper who understands the specific mechanics.
Stage-Based Billing and Revenue Recognition Under AASB 15
The Australian Institute of Architects' standard fee agreement structures architectural services into discrete stages: schematic design, design development, documentation, tender, and construction administration. Engineering firms use similar stage structures (concept design, preliminary engineering, detailed design, construction support). Each stage has a defined scope and typically a defined percentage of the total fee.
Under AASB 15 Revenue from Contracts with Customers, the key question is whether each stage is a distinct performance obligation or whether the contract is a single obligation satisfied progressively. The answer depends on whether the customer can benefit from a completed stage independently of the remaining stages.
In many architectural contracts, a client who receives a completed schematic design package has received something independently useful — they can engage a different architect for design development if they choose. This supports treating each stage as a distinct performance obligation, with revenue recognised when (or as) each stage is substantially completed. The advantage of this approach is that revenue recognition tracks closely to the billing trigger — avoiding the accumulated contract asset balances that arise under a single-obligation model.
Where stages are not distinct (the deliverable at each stage is only valuable in combination with the whole), the contract is a single performance obligation recognised over time using the percentage-completion method. In that case, the firm must maintain a WIP schedule similar to a construction contractor.
WIP Measurement Between Billing Events
Between billing events, the work performed (staff time, principal time, design hours) accumulates as WIP. The WIP balance represents costs incurred on incomplete stages or uncompleted performance obligations that have not yet been invoiced.
For time-based engagements, WIP is straightforwardly the value of hours recorded in the time system multiplied by the charge-out rate (or cost rate if the firm values WIP at cost). For fixed-fee engagements, WIP is the proportion of the stage fee earned based on completion percentage — which requires the project leader to assess the percentage of each stage completed at period end.
The risk in a fixed-fee architectural engagement is the over-run. If the firm agreed to a fixed documentation fee of $80,000 and the actual hours worked reach $110,000 in value before the stage is complete, the WIP carrying value must be written down to the net recoverable amount — $80,000 less any amounts already billed and recognised. Carrying WIP above the recoverable amount overstates assets and understates the loss on the project.
Regular comparison of the WIP balance to the remaining unbilled fee on each project is an essential month-end control. Any project where accumulated costs exceed the remaining contract value should be flagged for write-down and a conversation with the project manager about scope control.
Consultant Disbursements: Principal or Agent?
Architecture and engineering firms routinely engage specialist consultants on behalf of their clients — structural engineers, hydraulic engineers, geotechnical consultants, town planners, acoustic engineers. These consultant fees are then recharged to the client, often with a management margin.
The principal vs. agent question under AASB 15.B34–B38 determines whether the firm records the gross consultant fee as revenue (and the consultant's invoice as an expense), or records only the net margin. The test is control: if the firm:
- Selects and directs the consultant (controls the service before it is transferred to the client),
- Is responsible for the quality and delivery of the consultant's work, and
- Bears the risk of the consultant not performing
…then the firm is the principal and must record gross revenue and gross expense. If the firm is merely arranging the consultant on the client's behalf (acting as agent), only the margin is revenue.
In practice, most architectural firms are principals for consultant disbursements — they accept responsibility for the design team's output, not merely for introducing the consultant. This means a firm that passes through $200,000 in structural engineering fees and charges a 10% management fee should be recording $220,000 in revenue and $200,000 in consultant costs, not $20,000 in revenue. The distinction is material to reported turnover and gross margin.
Ensure the engagement letter is reviewed — some firms explicitly document that consultant appointments are as agent for the client, with the client assuming the contract directly. That factual structure supports agent treatment.
Professional Indemnity Insurance: Prepayment Treatment
Professional indemnity (PI) insurance for architectural and engineering firms is typically the largest single insurance expense and one of the most complex to account for correctly. PI policies are annual contracts that renew ahead of the firm's financial year end — meaning a portion of the annual premium is always prepaid at balance date.
The unexpired portion of the premium at year end must be recognised as a prepayment (current asset) under accrual accounting. If the annual premium is $60,000 and the policy renewed on 1 March (four months before a 30 June year end), the prepayment at 30 June is 8/12 × $60,000 = $40,000.
For firms with complex claims histories, PI insurers sometimes offer long-tail policies that extend coverage for a period after the firm ceases to practise or after a partner retires. These extended reporting endorsements are additional one-off premiums — treat them as prepayments amortised over the coverage period.
Note that PI insurance covers the period of potential liability, which may extend well beyond the construction phase. Post-occupancy defect claims can arise years after project completion. The insurance expense is recognised in the period to which coverage relates, not the period of the insured event.
Hourly Rate vs. Fixed-Fee Contracts: Time Recording as the Foundation
For time-and-materials or capped-fee contracts, the time recording system is the foundation of both invoicing and WIP measurement. Every billable hour must be logged against the correct project and stage, at the appropriate charge-out rate, in the period it is incurred. Missing timesheets, retrospective time entry, or timesheet fraud directly impairs both the revenue recognition calculation and the WIP valuation.
The bookkeeper should run a weekly report of unbilled timesheets — hours recorded but not yet converted to an invoice. Any hours recorded on a fixed-fee project that has already reached its fee cap should be flagged as a non-billable overrun and expensed immediately rather than accumulated in WIP.
End-of-Period Checklist for Architecture and Engineering Firm Bookkeepers
- Review each active project: confirm whether stages are distinct performance obligations or a single obligation; update the WIP schedule with current completion percentage and costs to date
- Calculate the net revenue remaining on each fixed-fee project (contract value less revenue already recognised); write down any WIP balance that exceeds the net recovery amount
- Review consultant disbursement recharges: confirm the firm's principal or agent status for each major consultant engagement and ensure gross or net recording is applied consistently
- Calculate PI insurance prepayment at balance date: prorate by days or months of unexpired coverage; post the prepayment and adjust the insurance expense accordingly
- Confirm all project revenue entries are supported by either a billing event, a completion assessment, or a percentage-completion calculation with documented basis
- Run the unbilled WIP report: contact project managers for status updates on stages at 80%+ completion; issue invoices where billing conditions are met
- Review any projects with time written off or fee reductions agreed with clients; adjust WIP and recognise the reduction as an expense in the current period