In a services firm, how you bill decides who carries the risk when a project runs long.
Consultancies, agencies and integrators carry billing complexity that product companies never meet. One engagement can mix hourly work, fixed milestones, a retainer and pass-through expenses. Each of those hits cash and revenue recognition differently.
The models
Time and materials bills actual hours at agreed rates. It is flexible, and it depends entirely on rigorous time tracking. A fixed fee ties the price to deliverables and moves scope risk to you, so keep change orders disciplined.
Retainers give the client a predictable spend and give you smoother cash. Define the included scope and what happens when it is exceeded, before you start.
- Time and materials, with a rate card by role
- Fixed fee tied to milestone acceptance
- Monthly retainer with scoped hours or deliverables
- Hybrid: fixed discovery, then time and materials for delivery
Time capture and utilization
Billable utilization, the share of available hours you actually bill, is what drives profitability. Record time daily. Entering a week on Friday afternoon loses hours and causes client disputes.
Separate billable, non-billable and investment hours. Without that split you cannot see what a project really earned.
Invoices clients approve quickly
Map every charge back to the statement of work: hours by role, the milestone description, the retainer period. Detail cuts disputes and gets invoices approved faster.
On long projects, bill progressively. One invoice at the end is a cash flow problem you chose.
Margin, project by project
Track gross margin by project and by client, rather than a firm-wide average. Over-servicing a strategic account is invisible in the average and expensive in reality.
Forecast the pipeline with expected start dates, billing milestones and resource plans, so hiring and cash needs do not arrive as a surprise.
Written by the team at Ambivo, a business platform that keeps CRM, accounting and ERP on one customer record. This article is general guidance on the topic rather than a description of Ambivo features.