LESSON NOTES · レッスンノート

N3Talking to real people · Sep 28, 2026

How to ask for a deadline extension in Japanese: always with your own new date

Asking for a deadline extension in Japanese never stays vague about time. 締め切しめきりを〇日にちまで延のばしていただくことは可能かのうでしょうか ("would it be possible to extend the deadline to [date]?") always names the specific new date you're asking for, paired with an apology — an open-ended "please give me more time" leaves the other person with a decision they can't actually make.

The instinct in English is sometimes to ask for extra time first and negotiate the exact date afterward. In Japanese, that order is reversed: you propose your own concrete new date upfront, since asking someone to name a new deadline for you shifts an uncomfortable decision onto them, when it's really your responsibility to know how much time you need.

The basics

The core request: 締め切しめきりを延のばしていただくことは可能かのうでしょうか

This is the standard, formal way to ask for an extension, and it works with a specific date attached rather than left as an abstract request.

恐おそれ入いりますが、締め切しめきりを25日にちまで延のばしていただくことは可能かのうでしょうか。 — I'm sorry to ask, but would it be possible to extend the deadline to the 25th? (polite, business)

延のばす ("to extend, lengthen") is the plain verb for pushing a deadline back, and いただくことは可能かのうでしょうか ("would it be possible for you to...") keeps the whole sentence a humble question rather than a demand for approval.

Never leaving the new date open-ended

A vaguer opener like もう少すこしお時間じかんをいただけますでしょうか ("could I have a little more time?") is fine as a first line, but it should always be followed immediately by a concrete commitment, not left hanging.

もう少すこしお時間じかんをいただけますでしょうか。25日にちまでにはお渡わたしできます。 — Could I have a bit more time? I can deliver it by the 25th. (polite, softer opener followed by a concrete date)

お渡わたしできます ("I can deliver/hand over") turns the vague first sentence into an actual commitment the other person can plan around — an apology alone, in the same spirit as the ladder covered in how to say sorry in Japanese, was never going to be enough on its own.

Beyond the basics

Giving a reason without over-justifying

As with most Japanese requests that inconvenience someone else, the reason for needing more time can stay fairly brief — 〜の都合つごうにより ("due to circumstances with ~") or a short, specific cause is normal and doesn't need extensive justification.

資料しりょうの確認かくにんに想定そうていより時間じかんがかかっており、恐おそれ入いりますが延長えんちょうをお願ねがいできますでしょうか。 — Checking the materials is taking longer than expected, so I'm sorry to ask, but could I request an extension? (polite, brief, specific reason)

想定そうていより時間じかんがかかっており ("taking longer than expected") is specific enough to sound genuine without turning into a long explanation — a short, concrete reason reads as more credible than either no reason at all or an overly elaborate one.

Acknowledging the inconvenience explicitly

Because an extension shifts a cost onto the other person's schedule, Japanese requests for one usually name that cost directly with ご迷惑めいわくをおかけしますが ("I'm causing you inconvenience, but") rather than skip past it.

ご迷惑めいわくをおかけしますが、何卒なにとぞよろしくお願ねがいいたします。 — I'm sorry for the inconvenience this causes, but I appreciate your understanding. (polite, closing an extension request)

何卒なにとぞよろしくお願ねがいいたします ("I humbly ask for your understanding") is a common, slightly formal closing line for exactly this kind of request — it doesn't add new information, but it signals that you're aware the request has a real cost for them, matching the careful register used generally in Japanese business vocabulary.

Committing hard to the new date once it's granted

Once an extension is granted, asking for a second one on the same task reads very differently from the first request — it starts to suggest the deadline itself wasn't taken seriously. A firm 必かならず ("without fail, definitely") signals that this new date is not another soft estimate.

次回じかいは必かならず期限きげんまでに提出ていしゅついたします。 — Next time, I will submit it by the deadline without fail. (polite, committing after an extension)

This line matters most as a forward-looking commitment rather than an apology for the current situation — it tells the other person this extension is meant to be the last one, not the first of several. When you are the one waiting on someone else's late reply, a polite reminder in Japanese frames your follow-up with 念ねんのため (just in case), so it reads as your own caution, not an accusation.

The casual version, among friends or classmates

Between people who know each other well, the whole structure shrinks to a direct question with a light apology, without the layered cushioning of the business version.

ごめん、ちょっと厳きびしくて。あと2日待ひまちってもらえる? — Sorry, it's a bit tight. Could you give me two more days? (casual, to a friend or classmate)

厳きびしくて ("it's tough/tight") stands in for a longer explanation, and あと2日か ("two more days") does the same job as the concrete date in the formal version — naming exactly how much more time, not just asking for "more." If you then hit the new date with no margin at all, that is ぎりぎり間に合まにあった, and how ぎりぎり works sets it against 余裕よゆうで間に合まにあった, made it with time to spare.

Common mistakes

  • Asking for "more time" without naming a specific new date. This leaves the other person unable to plan, the same problem as a lateness message with no arrival estimate.
  • Asking for a second extension on the same deadline. This reads as the original commitment not being taken seriously — 必かならず after the first extension is meant to prevent needing a second one.
  • Skipping ご迷惑めいわくをおかけしますが entirely. Not acknowledging the cost to the other person makes the request sound like it assumes the extension is free, which it usually isn't.
  • Waiting until after the deadline has already passed to ask. Asking before the deadline, even close to it, reads very differently from asking once you're already late — the request itself should arrive on time even if the work doesn't.
  • Over-explaining the reason at length. A short, specific cause like 資料しりょうの確認かくにんに時間じかんがかかっており is more credible than either no reason or an unnecessarily detailed one.

Deadline-extension phrases at a glance

Phrase Use it for
あと2日待ひまちってもらえる? Casual, a friend or classmate
もう少すこしお時間じかんをいただけますでしょうか Polite opener, followed by a concrete date
締め切しめきりを〇日にちまで延のばしていただくことは可能かのうでしょうか Standard formal extension request
ご迷惑めいわくをおかけしますが Acknowledging the cost to the other person
次回じかいは必かならず期限きげんまでに提出ていしゅついたします Committing after an extension is granted

FAQ

Is it okay to ask for a deadline extension in Japanese business culture? Yes, as long as it's framed with an apology, a concrete new date, and acknowledgment of the inconvenience — a bare request for "more time" with no specifics is what reads poorly, not the request itself.

Do I need to explain why I need more time? A short, specific reason is expected and helps, but it doesn't need to be detailed — something like 資料しりょうの確認かくにんに時間じかんがかかっており is sufficient without becoming a long justification.

What if I need a second extension after already getting one? This is a much harder ask than the first one, since it suggests the earlier commitment wasn't reliable — if at all possible, propose a firm date you're confident about rather than asking again later.

Should I ask before or after the original deadline has passed? Always before, even if it's close to the deadline. Asking after the fact reads as having let the deadline slip silently rather than managing it proactively.

Is もう少すこしお時間じかんをいただけますか enough on its own? It works as an opening line, but it should be followed immediately by a specific date you can commit to — leaving it vague puts the decision back on the other person.

Practice

1. "I'm sorry to ask, but would it be possible to extend the deadline to the 25th?"

Show answer

恐おそれ入いりますが、締め切しめきりを25日にちまで延のばしていただくことは可能かのうでしょうか。 — The specific date (25日にちまで) is what makes this request actionable.

2. "Could I have a bit more time? I can deliver it by the 25th."

Show answer

もう少すこしお時間じかんをいただけますでしょうか。25日にちまでにはお渡わたしできます。 — The vague opener is immediately followed by a concrete commitment.

3. "Checking the materials is taking longer than expected, so I'm sorry to ask, but could I request an extension?"

Show answer

資料しりょうの確認かくにんに想定そうていより時間じかんがかかっており、恐おそれ入いりますが延長えんちょうをお願ねがいできますでしょうか。 — A short, specific reason is credible without becoming a long justification.

4. "I'm sorry for the inconvenience this causes, but I appreciate your understanding."

Show answer

ご迷惑めいわくをおかけしますが、何卒なにとぞよろしくお願ねがいいたします。 — This directly names the cost to the other person rather than skipping past it.

5. "Next time, I will submit it by the deadline without fail." (after being granted an extension)

Show answer

次回じかいは必かならず期限きげんまでに提出ていしゅついたします。 — 必かならず signals this new date is a firm commitment, not another soft estimate.

6. "Sorry, it's a bit tight. Could you give me two more days?" (casual, to a classmate)

Show answer

ごめん、ちょっと厳きびしくて。あと2日待ひまちってもらえる? — あと2日か names the exact extra time needed, the casual equivalent of a concrete date.

7. Fix this: もう少すこし時間じかんをください, with no specific date ever mentioned afterward.

Show answer

もう少すこしお時間じかんをいただけますでしょうか。〇日にちまでにはお渡わたしできます。 — Adding a concrete date turns a vague request into one the other person can actually plan around.

8. Why is a second extension request on the same task much harder than the first one?

Show answer

Because it suggests the first commitment wasn't taken seriously — 必かならず after the first extension is specifically meant to prevent needing to ask again.

9. True or false: it's fine to ask for an extension right after the original deadline has already passed.

Show answer

False. — Asking before the deadline, even close to it, reads very differently from asking once you're already late.

10. What does ご迷惑めいわくをおかけしますが accomplish in an extension request?

Show answer

It explicitly acknowledges the cost the extension creates for the other person, rather than treating the extension as if it were free.

Use a trial lesson to write and say a polite request to move a deadline, leading with your own new date and 恐おそれ入いりますが.

Vocabulary from this article

Tap the block to select all of it, then copy. In Anki: File → Import, note type Basic, separator Tab — the first column becomes the front, the second the back.

締め切り	しめきり — a deadline
延ばす	のばす — to extend, push back (a date)
延長	えんちょう — an extension
ご迷惑	ごめいわく — inconvenience, trouble (honorific)
恐れ入りますが	おそれいりますが — I'm sorry to trouble you, but
都合	つごう — circumstances
提出	ていしゅつ — submission
必ず	かならず — without fail, definitely
もう少し	もうすこし — a little more
期限	きげん — a deadline, time limit

I'm Yuuki, a Japanese teacher based in Tokyo. I've taught on italki as a Top 1% teacher and watched over 1,500 anime, and the students who ask for extensions most gracefully are the ones who lead with their own proposed date instead of waiting to be told one.

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Sources: the author's own lessons and standard reference grammars.

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