〜なくてもいい: How to Say 'You Don't Have To' in Japanese

N5guideUpdated 2026-07-18

Giving someone permission to skip it

〜なくてもいい tells a person an action is not required — they're free to leave it undone. The literal pieces read "even if (you) don't… it's good," which English smooths into "you don't have to" or "it's okay not to." Think of it as the mirror image of 〜てもいい: where that hands out permission to do something, this hands out permission not to.

今日は来なくてもいいです。

きょうは こなくても いいです。

You don't have to come today.

ヤッタンは急がなくてもいい。

ヤッタンは いそがなくても いい。

Yattan doesn't have to hurry.

モチは宿題をしなくてもいいですか。

モチは しゅくだいを しなくても いいですか。

Mochi, do I not have to do the homework?

As a question, it asks whether an action can be skipped.

Building it from the ない-form

Every version starts the same way: take the ない-form, drop the final , and you get なくて. Then attach もいい(です). The one letter to be careful with is that final い — remove only it, so 食べない becomes 食べなくてもいい, never the stray 食べないでもいい.

Word typeStepsResult
る-verb (食べる)食べない → 食べなくて → +もいい食べなくてもいい
う-verb (急ぐ)急がない → 急がなくて → +もいい急がなくてもいい
Irregular (来る)来ない → 来なくて → +もいい来なくてもいい
Irregular (する)しない → しなくて → +もいいしなくてもいい
い-adjective (高い)高くない → 高くなくて → +もいい高くなくてもいい
な-adj / noun (静か / 学生)じゃない → じゃなくて → +もいい静かじゃなくてもいい

The last row matters: the pattern isn't only for verbs. An い-adjective shifts い → くない → くなくて:

部屋はそんなに広くなくてもいいです。

へやは そんなに ひろくなくても いいです。

The room doesn't have to be that big.

A noun or な-adjective takes じゃなくて instead — reach for this, not the verb pattern, when the thing that's optional is a noun (学生じゃなくてもいい):

新しいのじゃなくてもいいよ。

あたらしいのじゃなくても いいよ。

It doesn't have to be a new one.

のじゃなくてもいい = doesn't have to be the [adjective/noun] one.

先生は、答えは漢字じゃなくてもいいと言いました。

せんせいは、こたえは かんじじゃなくても いいと いいました。

The teacher said the answer doesn't have to be in kanji.

Everything above is casual; add です to make it polite — 来なくてもいいです.

The trap: "don't have to" is not "must not"

This is the mistake worth guarding against on a test. 〜なくてもいい lets you skip an action; the look-alike 〜てはいけない forbids it. 食べなくてもいい means "you don't have to eat," but 食べてはいけない means "you must not eat" — nearly reverse messages sitting one syllable apart. When a multiple-choice line offers both, read the て versus なくて before anything else.

Lined up against "must" and "may"

Three neighbouring patterns are easy to blur, so it helps to see them side by side:

FormCore ideaExample
〜なくてもいいdon't have to (no obligation)行かなくてもいい = you don't have to go
〜なければならないmust / have to (obligation)行かなければならない = you must go
〜てもいいmay / it's okay to (permission)行ってもいい = you may go

〜なくてもいい is the straight opposite of 〜なければならない ("must"): one lifts the duty, the other imposes it. And it's the negative twin of 〜てもいいmay do versus don't have to do. See 〜なければならない for the obligation side.

ヤッタンの弟は、まだ漢字を覚えなくてもいい。

ヤッタンの おとうとは、まだ かんじを おぼえなくても いい。

Yattan's little brother doesn't have to learn kanji yet.

The short version

Practice it

Choose the correct なくてもいい form for each verb, adjective, or noun.

Question 1 / 3 · Score 0

___に入れるのに最もよいものを選びなさい。

Choose the grammar pattern that best completes the sentence.

明日は___。

Frequently asked questions

What does 〜なくてもいい mean?

It means 'you don't have to' or 'it's okay not to' do something — the action is optional. 急がなくてもいい means 'you don't have to hurry.'

How do I form 〜なくてもいい?

Take the verb's ない-form, drop the final い to get なくて, then add もいい(です). 来る → 来ない → 来なくてもいい.

What's the difference between 〜なくてもいい and 〜なければならない?

They're opposites. 〜なくてもいい = 'don't have to' (no obligation); 〜なければならない = 'must / have to' (obligation). 行かなくてもいい vs 行かなければならない.

Can I use 〜なくてもいい with adjectives and nouns?

Yes. For い-adjectives: 高くなくてもいい ('doesn't have to be expensive'). For nouns and な-adjectives: 漢字じゃなくてもいい ('doesn't have to be kanji').

By the Editorial Team · Last updated 2026-07-18

This guide is built on Yatta's own Japanese-grammar ontology and our analysis of every JLPT written question type — not scraped or auto-summarised. How we build our content & sources →

Where 〜なくてもいい fits

Don't confuse it with

  • 〜てもいい · N5〜てもいい means 'it's okay to' or 'may': verb て-form + もいい(です). Learn to ask permission with 〜てもいいですか, reply naturally, and use 〜てもかまいません.
  • 〜なければならない · N5〜なければならない means 'must' or 'have to' in Japanese. Learn the ない-form formation, the polite なりません, casual なきゃ, the なくてはいけない variant, and the opposite なくてもいい.

More N5 grammar to explore

Keep going with related patterns at the same level:

  • ですです is the polite 'to be': NOUN/な-adjective + です means 'is/are.' Learn the negative じゃありません, past でした, how です attaches to い-adjectives, and the plain だ.
  • どんなどんな means 'what kind of ~' and always sits before a noun: どんな音楽が好きですか. Learn the こ・そ・あ・ど set, どんな vs どう, and どんな〜でも ('any ~ at all').
  • ある vs いるJapanese has two existence verbs: いる for living things (people, animals) and ある for objects, plants, and events. Learn が, に, the negatives, and the classic mistakes.
  • ごろ vs くらいごろ marks an approximate POINT in time (3時ごろ = around 3 o'clock), while くらい/ぐらい marks an approximate amount or duration (3時間くらい = about 3 hours).
  • 〜ほうがいい〜ほうがいい gives advice: use the past (た) form for 'you should do X' (休んだほうがいい) and the ない-form for 'you'd better not' (行かないほうがいい). Learn the forms and nuance.