Imagine this, last year, you did something completely legal. No rules against it. No one told you it was wrong. Then suddenly, a new law comes out today saying that what you did is now illegal. Can they punish you for what you did back then?
The answer is no, and that’s because Article 4 of the Civil Code basically says: “The law looks forward, not backward.”1 This is one of the ways the law protects fairness so you can live without worrying that yesterday’s actions will suddenly make you a lawbreaker today.
In simple terms, it means when a new law is made, it usually applies only from now on, not to things that already happened before the law existed. Think of it like changing the rules in a game, you can’t suddenly say “You broke the rule!” for something that happened before the rule was even made.
Why Is This Important?
- It’s about fairness. People should only be judged based on the rules that existed when they acted.
- It builds trust. You can plan your actions knowing the law won’t suddenly “reach into the past” to catch you.
- It avoids chaos. If laws applied backward, people would constantly be unsure about what’s safe or legal.
Are There Exceptions?
Yes. There are exceptions to the rule. A law can apply to past events only if it specifically says so, such as when Congress or the law itself makes it clear that its provisions cover earlier actions or situations.2
If the Supreme Court gives a new explanation of a law, does it apply to past actions?
Normally, no new law can punish you for something you did before it existed — that’s the rule: the law looks forward, not backward. But if the Court is only clarifying what an old law has always meant, that explanation is treated as if it was there from the very beginning.
In San Miguel Corporation v. CIR (2023), the Supreme Court said that the rule from an earlier , it only explained what the law already meant from the start.3
This follows the idea of “the law looks forward, not backward”, you normally can’t be punished by a new law for past actions, but if the Court is just clarifying an existing law, it’s as if that meaning was there all along.
Article 4 protects people from being punished for acts that were legal at the time they were done. The law’s role is to guide future actions, not to change the rules of the past, unless it is expressly made to apply backward.
- Civil Code of the Philippines, Art. 4. ↩︎
- 1987 Philippine Constitution, Art. III, Sec. 22. ↩︎
- San Miguel Corporation v. Commissioner of Internal Revenue, G.R. Nos. 257697 & 259446, April 12, 2023 ↩︎
