made-vs-made-ni

If you have ever told your teacher “I will study until 9 o’clock” when you meant “I will finish my homework by 9 o’clock,” you have already experienced the まで vs までに trap. These two expressions look almost identical, but they carry a completely different meaning — and mixing them up can lead to real misunderstandings in Japanese. This guide will show you exactly when to use each one, with real-world examples and a decision flowchart so you never second-guess yourself again.

Yuka

Rei, I keep getting confused. 「6時まで宿題をする」and 「6時までに宿題をする」— are they really that different?

Rei

Yes! They sound similar but mean very different things. 「6時まで宿題をする」means you are actively doing homework the entire time up to 6 o’clock. But 「6時までに宿題をする」means your homework just has to be finished sometime before 6 — you could finish at 4:30 and that is perfectly fine!

まで — Continuous “Until”

まで on its own means “until” or “up to” a point in time or place. The key idea is continuity: the action or state does not stop before the endpoint — it runs the entire way through.

Formation

[Time / Place / Point] + まで + [Continuous verb or state]

The verb is usually one that describes an ongoing activity or state — working, waiting, studying, sleeping, and so on.

Core examples

Important nuances for まで

• The action fills the whole period. If you say 「5時まで待った」, you were waiting the whole time — not just at 5 o’clock.
• まで can also mark spatial endpoints. 「駅まで走った」= “I ran all the way to the station.” Space and time work the same way.
• Clause + まで. まで can follow a full clause: 「彼が来るまで」= “until he comes.” The verb before まで is usually in its plain (dictionary or た) form.

までに — Deadline “By”

までに adds the particle に to まで, shifting the meaning from duration to deadline. It says: “something must happen at some point before this time.” The focus is entirely on the completion of a single event — not on what you are doing during the lead-up.

Formation

[Time / Event] + までに + [Completion or one-time action verb]

Core examples

Important nuances for までに

• Early is fine, late is not. 「金曜日までに」means any time up to and including Friday is acceptable — Tuesday is fine.
• The に is the destination particle. Think of it as: the action is “pointed at” the deadline moment. This is why completion verbs feel natural here.
• No spatial use. Unlike まで, までに is only used for time and events — never for marking a physical destination.

The Critical Difference — Ongoing vs. One-Time Action

This is the heart of the distinction, so let us look at it very carefully with paired examples.

The single best test: Can you replace the Japanese phrase with “the whole time until…”? If yes, use まで. If the phrase means “at some point before…,” use までに.

Yuka

So if I say 「授業が終わるまで待って！」I am asking someone to wait the whole time until class ends, right? But if I say 「授業が終わるまでに連絡して」I am asking them to contact me sometime before class is over?

Rei

Exactly right! You have got it. 「待つ」is a continuous action that fills the time, so it takes まで. But 「連絡する」is a single completed action — a message sent once — so it takes までに to mark the deadline.

Common Mistakes and Traps

Mistake 1: Using まで with completion verbs

When the verb describes a single completed action — like submitting, finishing, or arriving — まで sounds unnatural or changes the meaning significantly.

Mistake 2: Using までに with state verbs or continuous activities

Adding に to まで with a verb that describes an ongoing state or activity produces strange results because deadlines do not apply to continuous actions the same way.

Mistake 3: Forgetting that までに cannot mark physical destinations

まで works for both time and space. までに only works with time / event deadlines.

Mistake 4: The “still / not yet” trap with まで

「まだ〜まで時間がある」(“There is still time until…”) uses まで, not までに. New learners sometimes over-correct and use までに here.

✅  締め切りまでまだ3日ある。   There are still 3 days until the deadline.
❌  締め切りまでにまだ3日ある。  (awkward — does not make sense)

Real-World Examples — Work, Study, and Travel

At work (仕事で)

While studying (勉強中に)

While travelling (旅行中に)

How to Choose — Decision Flowchart

When you are not sure which form to use, walk through this flowchart:

Are you talking about a time or event endpoint?
│
├── No (it's a physical location) ──────────────────────► Use まで only
│                                                          e.g. 駅まで歩く
│
└── Yes (it's a time or event)
    │
    ├── Is the action continuous / ongoing?
    │   (waiting, working, staying, sleeping, studying the whole time)
    │   │
    │   └── YES ──────────────────────────────────────────► Use まで
    │                                                        e.g. 6時まで待つ
    │
    └── Is the action a single completion / one-time event?
        (finishing, submitting, calling, arriving, buying)
        │
        └── YES ──────────────────────────────────────────► Use までに
                                                            e.g. 6時までに提出する

Still unsure? Ask yourself:
  "Does the action fill the time ALL THE WAY up to the point?" → まで
  "Does the action just need to be DONE BEFORE the point?"    → までに

Yuka

This flowchart is so useful! One more question — what about 「出発までに準備する」vs 「出発まで準備する」? Which one sounds more natural when you are packing for a trip?

Rei

「出発までに準備する」is far more natural! Packing is a task you complete — you are not continuously packing every second until the moment you leave. You finish it at some point before departure. 「出発まで準備する」would suggest you are still stuffing things into your bag as you walk out the door!

Quick Quiz — Test Yourself!

Choose まで or までに to complete each sentence. The answers are below.

Questions

1. バスが来る（　　）ここで待ってください。
   Please wait here until the bus comes.
2. 金曜日（　　）このフォームを提出してください。
   Please submit this form by Friday.
3. 先生が戻る（　　）静かにしていてください。
   Please be quiet until the teacher comes back.
4. 試験（　　）単語を全部覚えたい。
   I want to memorize all the vocabulary before the exam.
5. 彼は朝6時（　　）ずっと働いていた。
   He kept working all the way until 6 a.m.
6. チェックアウトは正午（　　）お願いします。
   Please check out by noon.

Answers

1. バスが来るまでここで待ってください。— Waiting is a continuous action that fills the time.
2. 金曜日までにこのフォームを提出してください。— Submitting is a one-time completed action with a deadline.
3. 先生が戻るまで静かにしていてください。— Staying quiet is a continuous state up to the endpoint.
4. 試験までに単語を全部覚えたい。— Memorizing is a completion task; you want it done before the exam.
5. 彼は朝6時までずっと働いていた。— Working continuously until 6 a.m. — duration all the way through.
6. チェックアウトは正午までにお願いします。— Checking out is a single event with a deadline.

Score guide

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