たほうがいい【～たほうがいい】

The structure たほうがいい is used to give advice or make a suggestion that someone should do something. It literally means "it would be better to do ~" and is equivalent to English "you should ~" or "you had better ~." The verb is always in the た-form (past tense form), even though the meaning refers to the present or future.

Why the た-form?

Although the advice is about a future action, the た-form is used because it implies the certainty of having completed the action – as if saying "it would be better if you had done it" or "it would be better once it's done." Using the dictionary form (するほうがいい) is grammatically possible but sounds more like a general statement about what is better, rather than a direct piece of advice.

Politeness

Adding です at the end makes the expression polite:

In casual speech, です is dropped:

Nuance

This pattern often carries a sense of mild urgency or concern. It suggests that not following the advice could lead to a negative outcome. It is used when giving advice about health, safety, or practical matters.

Contrast with ないほうがいい

To advise someone not to do something, use the ない-form (plain negative) instead of the た-form: