Invoice clients for technical advisory, architecture reviews, and technology strategy work. Professional invoices from Tidybill.
A technical consultant invoice covers broad technology advisory work that helps businesses make sound technology decisions, solve complex engineering problems, or navigate technical challenges that require deep expertise. Technical consultants are typically experienced engineers who have moved into an advisory role, providing guidance on architecture, technology selection, engineering team processes, build-versus-buy decisions, technical due diligence for M&A, and system reviews. Because technical consulting is characterised by judgment and expertise rather than hands-on implementation, it commands a premium rate. Invoices should describe the problem addressed, the analysis or advisory work performed, and the recommendations or deliverables produced. Day rate or fixed-price engagement billing is common, with some consultants charging a project fee plus a success-based component for cost reduction or efficiency improvement work.
| Service | Typical Rate | Unit |
|---|---|---|
| Technical consulting (day rate) | 900 | day |
| Technical architecture review | 2500 | project |
| Technical due diligence (M&A) | 4000 | project |
| Technology strategy workshop | 1500 | session |
| Build vs buy analysis | 1000 | project |
| Engineering team process review | 1200 | project |
Invoice at the end of each engagement on delivery of the agreed output. For ongoing advisory retainers, invoice monthly with a summary of advice given, decisions supported, and materials produced. Net 14 is reasonable for consulting engagements. For large fixed-price engagements, a 50% upfront and 50% on delivery structure is standard.