The main types of contracts are:
The two broad categories of contracts are fixed price contracts and cost-reimbursement contracts. Fixed price contracts allow for no consideration of the contractor’s actual costs in performing the contract. The contractor agrees to perform defined work for a firm fixed price. The maximum risk is on the contractor, with little risk on the purchaser. Cost reimbursement contracts are the opposite. The contractor is paid costs incurred in performing the work. There is little risk on the contractor.
Incentive contracts are a combination of the fixed price and cost reimbursement. For example, there are cost plus fixed fee and cost plus award fee contracts. The contractor gets paid costs, but is also guaranteed a fee.
There are many contract types that can be used. You may also see many variations and combinations of the contract types within the same contract. For instance, a single contract may allow for tasks to be ordered as fixed price, time and material, or cost reimbursement.