Definition
A Fixed Price Contract (or Firm Fixed Price) is an agreement where a vendor provides a specific set of deliverables or services for a single, guaranteed total price, regardless of how much time, effort, or materials the vendor ultimately expends.
Explanation
In B2B professional services, the Fixed Price Contract is a high-risk, high-reward model.
When executed perfectly on a well-understood scope of work, fixed price contracts can yield massive margins. If your team finds a way to deliver a $100k project in half the estimated time using automation or reusable IP, you keep the extra profit. (In a T&M model, you would bill fewer hours and make less money).
However, if the scope is ambiguous, a fixed-price contract is the fastest way to bankrupt a project.
The Risk Asymmetry
Under a fixed-price agreement, the vendor bears 100% of the delivery risk. If a "2-month" project stretches into 4 months due to [Scope Creep](/glossary/scope-creep), endless client revisions, or unforeseen technical debt, the vendor must eat the cost of the extra labor. The client pays the same amount.
This dynamic creates an adversarial relationship. The client is incentivized to squeeze as much value (scope) out of the vendor as possible before signing off, while the vendor is incentivized to do the bare minimum required by the contract to preserve their [Margin](/glossary/margin-leakage).
Commercial Checklist for Fixed Price Bids
If you must bid fixed-price, you must aggressively protect the [SOW (Statement of Work)](/glossary/sow):
- The 20% Risk Buffer: Did the estimation team add a mandatory risk contingency buffer (10-30%) to the raw cost estimate before pricing it?
- Ironclad Exclusions: Are the exclusions explicitly listed to prevent "implied" scope?
- Client Dependencies: Does the contract state that the fixed price is contingent on the client meeting their obligations (e.g., providing API access on time)? If the client delays, does the contract allow for a Change Order?
- Strict Acceptance Criteria: Is the definition of "done" objective, or subjective (e.g., "when the client is satisfied")? Subjective acceptance criteria on a fixed-price deal is a guaranteed recipe for unbilled rework.
Related Concepts
- [Time & Materials (T&M)](/glossary/time-and-materials)
- [Scope Creep](/glossary/scope-creep)
- [Margin Leakage](/glossary/margin-leakage)
- [Project Estimation](/glossary/project-estimation)
Why do clients prefer Fixed Price Contracts?+
Because it shifts all the financial and delivery risk to the vendor. The client knows exactly what they will pay, regardless of how long the project takes.
When is it safe to use a Fixed Price Contract?+
When the deliverables are highly standardized, repeatable, and you have historical data proving exactly how long it will take (e.g., an SEO audit, a standard system deployment). Never use it for custom software or exploratory consulting.
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