1. SUBSTANTIVE LAW
The Supreme Court's sole prerogative to issue, amend, or repeal procedural rules is limited to the preservation of substantive rights, i.e., the former should not diminish, increase or modify the latter. (Estipona, Jr. v. Lobrigo, G.R. No. 226679. 15 August 2017)
Substantive law is that part of the law which creates, defines and regulates rights, or which regulates the right and duties which give rise to a cause of action; that part of the law which courts are established to administer; as opposed to adjective or remedial law, which prescribes the method of enforcing rights or obtain redress for their invasions. (Ibid.)
2. PROCEDURAL LAW
Procedural law refers to the adjective law which prescribes rules and forms of procedure in order that courts may be able to administer justice. Procedural laws do not come within the legal conception of a retroactive law, or the general rule against the retroactive operation of statues - they may be given retroactive effect on actions pending and undetermined at the time of their passage and this will not violate any right of a person who may feel that he is adversely affected, insomuch as there are no vested rights in rules of procedure. (Sps. De Los Santos v. Vda. De Mangubat, G.R. No. 149508, 10 October 2007)
Procedural laws may be given retroactive effect to actions pending and undetermined at the time of their passage, there being no vested rights in the rules of procedure. Amendments to procedural rul...
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