When the reform hits you, the last thing you want is to realize that your 80 contracts are drafted for 48 hours and no one in your company knows where to start. I see it daily in medium-sized companies: the employer assumes that posting a memo is enough, the accountant thinks the change happens on its own, and the HR person has no idea what to sign first. The result: half-baked contracts, incorrectly calculated IMSS contributions, and a potential lawsuit for every worker who didn't sign anything. Here is the clean procedure, in five steps, with the LFT articles that will save your skin.