The Invoice Your Dev Agency Should Never Send You: Understanding Max-Price Software Models

Sylwia MaslowskaAdvisor Perspectives welcomes guest contributions. The views presented here do not necessarily represent those of Advisor Perspectives.

A CFO opens an invoice from their software development agency. They find that every hour is accounted for and that each developer logged their time accurately. Nothing on the bill is technically wrong. Yet the invoice still represents a failure.

Not because anyone acted in bad faith, but because the pricing model was based on effort instead of outcomes. The project delivered what was requested, but the final cost exceeded initial expectations due to extended timelines and evolving priorities. The invoice was transparent, but the investment was never truly predictable.

AI Is Changing the Conversation

Those invoices are more prominent than you might think. Why does that matter? Because now, the conversation includes how artificial intelligence is shaping software development. Stack Overflow's 2025 Developer Survey found that among more than 49,000 developers across 177 countries, 84% reported that they use or plan to use AI tools in development, while 51% of professional developers already use them daily. AI has already become a standard practice in software development.

If AI is changing how software is built, should software builds still cost the same?

The Limits of Time & Material Pricing

For decades, the Time & Material (T&M) model has been the default approach to software development. Until recently, it made sense. Software projects are inherently uncertain; requirements evolve and product teams often discover what they need only after development begins. Paying for time gave both clients and developers the flexibility to adapt without constantly renegotiating contracts.

The model compensated for the engineering effort. More work generally meant more hours, and more hours translated into higher costs. Enter AI, which is disrupting that relationship.

Productivity Gains & Their Implications

Developers can use AI to generate code, automate testing, draft documentation, and accelerate repetitive tasks. GitHub's controlled experiment on Copilot found that developers completed a programming task 55.8% faster with AI assistance. Productivity gains that once took years of process improvement are now happening through everyday development tools.

Many business leaders overlook the fact that the greatest financial risk in software projects lies in the commercial model behind the invoice.