Local (State and, in some cases, municipal) public agencies have their own procurement laws and regulations that sometimes differ from the Procurement Laws. Although, laws and regulations generally follow the principles set forth by their federal counterparts, there can be important differences, and local laws tend to be less-developed with regard to concepts such as multi-annual contracting and open contracts.

Furthermore, certain federal public agencies having budgetary and functional independence have their own independent procurement regulations, which often allow for more flexibility and are typically subject to internal contracting committees.

The Procurement Laws described above are the specific laws that apply for public contracts. The terms and provisions of these laws are usually mirrored in the contracts. Now, please consider that Mexico is evolving rapidly and in some cases, although the procurement processes are administrative in nature, the contracts are of a private and commercial nature. This is the case with contracts that can be now be entered into with the CFE and PEMEX, as a result of their new procurement and legal framework deriving from the Constitutional energy reform. Those contracts are no more administrative or public contracts.