Software Estimation: Why Fixed Bids Break—and What Works

Fixed-price contracts feel safe. They often hide risk premiums, encourage corner-cutting, or collapse when discovery surfaces reality. Here is a healthier pattern we use with product organisations.

The cone of uncertainty

Early estimates are inherently wide. Pretending otherwise forces vendors to pad silently or fight change orders later. Acknowledge uncertainty and plan in phases.

Phase zero: paid discovery

A short, bounded discovery produces architecture notes, backlog slices, risks, and a phased estimate. You pay for clarity—not a guess. Outputs should be yours to shop or take in-house.

Milestone pricing for known slices

Once scope is defined for a slice (e.g. MVP storefront), fixed milestones are fair. Tie payments to acceptance tests you agree up front.

Retainers for product iteration

After launch, roadmaps evolve weekly. Monthly capacity with a rolling priority list matches reality better than endless change orders.

Transparency when things shift

Good partners explain why estimates move: new integrations, compliance findings, or scope creep. Ask for impact analysis before approving additions.

Torq Studio publishes milestone plans after discovery and tracks burn vs forecast in steering meetings. If your next procurement cycle needs a commercial model review, we are happy to advise.