Short answer. Under this Title of the Labor Code, not less than seventy-five per cent of the applicable legal minimum wage, stated in a written employment agreement. But later disability legislation entitles a qualified worker with a disability to the same compensation as a qualified worker without one.
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
Labor Code, Article 80 — Employment Agreement For Handicapped Workers. Read the full provision →
What the Labor Code provision says
The article requires an employer who employs such workers to enter into an employment agreement stating four things: the names and addresses of the workers, the duration of the employment period, the work to be performed, and the rate to be paid the handicapped workers which shall not be less than seventy five (75%) percent of the applicable legal minimum wage. Note that the seventy-five per cent is a floor, not a rate. Nothing in the article requires an employer to pay it rather than the full wage; it fixes the point below which the agreement may not go.
The later statute is the one that usually governs
This is the article on which the most has changed. The Magna Carta for Persons with Disability proceeds on equal opportunity: a qualified employee with a disability is entitled to the same terms, conditions and compensation as a qualified employee without one. Where a worker is qualified for the job being done, the reduced floor in the Labor Code is not the measure of what is owed. An employer paying seventy-five per cent to someone doing the same work as colleagues on full wage should be asked which law it says permits that.
The agreement is a document you are entitled to have
The employment agreement is not optional and its contents are prescribed, which gives you four things to check on paper: your name and address, the rate, the duration of the employment period, and the work to be performed. The article also makes the agreement subject to inspection by the Secretary of Labor or his duly authorized representative. So the arrangement is meant to be visible to the department rather than settled privately between employer and worker, and an employment of this kind with no written agreement at all is already outside the article.
What to do if you are being paid the reduced rate
Get the agreement and read the rate and the described work. Then compare what you actually do with what colleagues on the full minimum wage do — that comparison is the substance of the question, because it goes to whether you are a qualified worker performing the same job. Keep payslips and any statement of why the lower rate applies. Bring the agreement, the payslips and a plain description of your daily duties to a lawyer; those three together are usually enough to say whether the reduction can stand.