Is it haram to lie to a teacher to get an extension?

Why a "small" lie still counts

Islam treats truthfulness as a core part of faith, not an optional extra. The Prophet ﷺ said that truthfulness leads to righteousness and righteousness leads to Paradise, while lying leads to wrongdoing and wrongdoing leads to the Fire (Sahih al-Bukhari 6094). He also listed lying when speaking as one of the signs of a hypocrite (Sahih al-Bukhari 33).

A fake excuse to a teacher also takes something you aren't entitled to, an extra few days that honest classmates didn't get. That makes it unfair as well as untrue.

Honest ways to ask for more time

• Tell the real reason. "I underestimated how long this would take" is honest, and many teachers respect it.
• Ask early. A request a week before the deadline gets a better answer than one sent at midnight.
• Offer a plan. Say what you've done so far and when you'll finish.
• Use official routes. Universities often have "extenuating circumstances" or "mitigating circumstances" forms for real problems like illness or bereavement.
• Accept the answer. If it's a no, submit what you have. A lower mark is better than a lie on your record.

What about real but private reasons?

You don't have to share every detail. If you're struggling with your mental health or a family issue, it's fine to say "I'm dealing with a personal situation" without explaining more. That is privacy, not lying. Fasting in Ramadan or Eid can also be a genuine reason to ask for flexibility.

If you've already lied

Don't panic. Sincerely regret it, ask Allah for forgiveness, and don't repeat it. If the lie gained you a clear advantage, scholars encourage putting it right where you reasonably can, for example by being honest next time or not claiming the same excuse again. This links closely to academic honesty in general. See Is it haram to cheat on exams? and Can I use AI to write my school or work assignments as a Muslim?