In a fixed price contract the:

In afixed price contract, the contractor agrees to deliver the project at a set price, regardless of the actual costs incurred. This means that the contractor assumes all the performance risk, as any cost overruns must be absorbed by the contractor. If the project costs more than the fixed price agreed upon, the contractor cannot charge the owner more. Conversely, if the project is completed under budget, the contractor benefits by retaining the difference.