{"id":88015,"date":"2026-01-26T18:45:31","date_gmt":"2026-01-26T17:45:31","guid":{"rendered":"https:\/\/invoicefly.com\/?p=88015"},"modified":"2026-02-13T10:36:15","modified_gmt":"2026-02-13T09:36:15","slug":"tiempo-y-materiales","status":"publish","type":"post","link":"https:\/\/invoicefly.com\/es\/academy\/time-and-materials\/","title":{"rendered":"El tiempo y los materiales explicados: Contratos, facturaci\u00f3n y buenas pr\u00e1cticas"},"content":{"rendered":"\t\t
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Time and Materials (T&M) contracts let clients pay for the real work that gets done\u2014based on the hours worked and the materials used\u2014rather than a fixed project price. This approach works especially well when a project’s scope isn’t fully defined or is likely to change along the way, helping both sides stay flexible and bill fairly.<\/p>\n\n\n\n

In this guide, we’ll explain how time and materials contracts work, when they make sense, their pros and cons, and best practices for tracking labor and materials accurately.<\/p>\n\n\n\n

What Is a Time and Materials (T&M) Contract?<\/strong><\/h2>\n\n\n\n

A time and materials contract is a billing arrangement where clients pay for two things: the actual time spent working on a project (billed at agreed hourly rates) and the actual cost of materials used, often with a markup.<\/p>\n\n\n\n

Unlike fixed-price contracts, a T&M agreement doesn’t lock in a total cost upfront. Instead, the contractor and client agree on labor rates, how materials will be priced, and how billing will be documented. The final cost reflects what the project actually requires as work progresses.<\/p>\n\n\n\n

In practical terms, a T&M contract prioritizes flexibility and transparency. It’s commonly used in construction, software development, consulting, maintenance, and repair work\u2014any situation where it’s difficult to predict time and materials accurately in advance. This pricing model offers an alternative to fixed bid arrangements when project requirements remain uncertain.<\/p>\n\n\n\n

Example<\/strong><\/h3>\n\n\n\n

Think of taking your car to a mechanic. You pay an hourly labor rate plus the cost of parts. Since no one knows exactly how long the repair will take until the work is done, the final bill comes afterward. A time and materials contract works the same way.<\/p>\n\n\n\n

How Do Time and Materials Contracts Work?<\/strong><\/h2>\n\n\n\n

Understanding the workflow behind T&M contracts helps both contractors and clients manage expectations and avoid billing disputes.<\/p>\n\n\n\n

Step 1: Establish rates and terms<\/strong><\/h3>\n\n\n\n

Before work begins, both parties agree on key pricing details, such as:<\/p>\n\n\n\n