What Is a Time and Material Contract? How It Works, Examples, and Pros and Cons

Time and Materials (T&M) contracts are a common type of agreement used in various industries, especially in software development, construction, and consulting. These contracts provide flexibility and transparency for both parties involved, but they also come with specific challenges that need to be managed effectively.

What Is a Time and Material Contract?

A Time and Materials contract is an agreement where the buyer pays the seller based on the actual time spent and materials used to complete a project. Unlike fixed-price contracts, where the cost is predetermined, T&M contracts allow for adjustments based on the project’s evolving needs.

The primary purpose of a T&M contract is to provide flexibility in project execution. It enables clients and contractors to adapt to changes without the need for renegotiating the entire contract. This is particularly valuable in dynamic environments where project requirements evolve over time.

The importance of visibility into contractual information extends beyond individual projects. As Gordon Thompson, Executive Vice President at Sirion, puts it: “If you do not understand the data within your contracts, you do not truly understand your business.” For T&M agreements, that means understanding not only the negotiated terms but also the labor rates, material costs, approvals, and obligations that determine actual commercial outcomes.

Time and Material Contract Example

Consider an enterprise hiring a software development vendor to modernize an internal application. The organization knows the desired business outcome but cannot fully define the technical requirements or development effort before work begins.

Under a time and material contract, the parties may agree that developers will be billed at predetermined hourly rates while cloud services, specialist software, and other approved materials are charged at actual cost or an agreed markup. The vendor submits timesheets and supporting cost records at defined intervals, and the buyer pays for approved work and expenses.

If requirements change during development, the parties can adjust the work without renegotiating the entire contract. However, they may use approval thresholds, change orders, and a not-to-exceed amount to prevent the flexibility of the T&M model from resulting in uncontrolled spending.

How Do Time and Materials Contracts Work?

Time and Materials contracts operate on the principle of billing the client for actual time spent and materials used in completing a project. This approach is particularly useful when the scope of work is not well-defined upfront. Contractors track hours worked and the cost of materials, providing detailed invoices to the client. Payment is made periodically, often monthly, ensuring ongoing cash flow for the contractor while allowing the client to monitor costs.

As Gordon explains: “Contracts are no longer just a document at the end of a long negotiation. Contracts are the starting point for long-term B2B relationships.” In a T&M arrangement, that relationship requires ongoing coordination because actual project activity continually affects cost, scope, and contractual performance.

How Time and Materials Are Charged

Time and materials are typically charged using agreed labor rates and actual or predefined material costs. Labor may be billed hourly or daily, with different rates applying to specific roles, skills, or seniority levels. Contracts should clearly define which activities are billable and how working time must be documented.

Material charges may include physical goods, software, equipment, travel, or other approved project expenses. The contract should specify whether these are billed at actual cost or include an agreed markup, as well as the documentation required to substantiate them.

Invoices are generally submitted on an agreed schedule and supported by timesheets, receipts, or other records. Buyers can also establish spending caps and approval thresholds so additional costs or work beyond agreed limits require authorization before they are incurred.

When to Use a Time and Materials Contract

Knowing when to leverage a time and materials contract can maximize flexibility and control over project outcomes.

1. Unclear or Evolving Scope: Ideal for projects where the full scope cannot be accurately determined at the outset.
2. Complex Projects: Suitable for endeavors requiring flexibility, such as custom software development or construction.
3. Variable Workload: When the amount of effort required fluctuates based on ongoing discoveries or requirements.
4. Short-Term or Temporary Work: Practical for smaller, well-defined tasks that don’t justify a fixed-price agreement.
5. Collaborative Projects: Encourages open communication and iterative progress, particularly in dynamic environments.
6. Resource-Dependent Projects: Beneficial when specific skills or expertise are critical and priced hourly.