Short answer. Four things. Article 80 requires the agreement to state the names and addresses of the workers employed, the rate to be paid, the duration of the employment period, and the work to be performed. The rate may not be less than seventy-five percent of the applicable legal minimum wage.
What the law says
The rate to be paid the handicapped workers which shall not be less than seventy five (75%) percent of the applicable legal minimum wage; The duration of employment period; and The work to be performed by handicapped workers.
Labor Code, Article 80 — Employment Agreement For Handicapped Workers. Read the full provision →
A floor, not a rate
Seventy-five percent is the lowest the agreement may go, not the figure it is supposed to carry. The article fixes a minimum below which the rate shall not fall, and says nothing to stop the parties agreeing on the full minimum wage or more. It is also measured against the applicable legal minimum wage, which varies by region and industry, so the floor moves when that moves. An employer quoting a fixed peso amount as "the rate for handicapped workers" is describing its own practice rather than the law.
Why duration and work have to be written down
The other two items look like formalities and are not. Stating the duration of employment period means the arrangement has a defined shape rather than continuing at the employer's pleasure, and stating the work to be performed ties the reduced rate to identified duties. Without those, the seventy-five percent floor becomes a general licence to pay less to a whole category of worker regardless of what they end up doing. With them, the agreement can be compared against what actually happens on the job.
The agreement is open to inspection
The article closes by making the employment agreement subject to inspection by the Secretary of Labor or his duly authorised representative. That is a meaningful addition. It means the document is not purely a private matter between the worker and the employer, and that an agreement which does not contain the four required items is visible to someone with power to act on it. It is also a reason for the employer to keep the agreement properly, and for you to hold your own signed copy.
Check the agreement against the job
Read your copy against what you are actually doing. If the duties have grown well beyond the work described, or the arrangement has run past the stated period without anything being signed, the agreement no longer matches the employment it is supposed to govern, and that is worth raising while the documents are still current. Keep the signed agreement, payslips showing the rate paid, and anything setting out your assigned duties — those three together are what any question about this article turns on.