✅ Until
Correct. The standard modern spelling with one “l”.
❌ Untill
Incorrect. An obsolete spelling or common typo.
If you are wondering whether to write until or untill, the answer is simple. One “l” is always correct in modern English. While words like “fill,” “will,” and “till” end with a double letter, until breaks this pattern. It ends with a single “l”. Using “untill” is considered a spelling mistake in formal writing, emails, and academic papers today.
Why Do People Write “Untill”?
Language evolves, and sometimes old habits leave confusing traces. Hundreds of years ago, specifically in the Middle Ages, the spelling untill was actually quite common. Writers used it interchangeably with other forms. However, as English dictionaries became standardized, the extra “l” was dropped.
Today, the confusion usually stems from the word Till. Since “Till” (meaning the same thing as until) has two “l”s, it feels logical to add two “l”s to “Until.” But English logic is tricky. The rule you need to follow is strict: if you add “un-” to the front, you must drop the last “l”.
💡 Quick Memory Tip: Think of the word “Unreal.” Just like unreal has one “l” at the end of the prefix, Until has one “l” at the end of the word.
Until vs. Till vs. ‘Til
This is where many writers get stuck. Is “Till” just a lazy version of “Until”? Is it slang? Actually, no. Till is historically older than “until.” It is a perfectly valid word and can be used in professional writing, though “until” is often preferred at the start of sentences.
Here is the breakdown of the three variations you might see:
| Word | Status | Notes |
|---|---|---|
| Until | ✅ Correct | Standard usage for all contexts. |
| Till | ✅ Correct | Less formal, but grammatically accurate. Older than “until.” |
| Untill | ❌ Incorrect | A spelling error. Do not use. |
| ‘Til | ⚠️ Informal | Often used in poetry or music, but avoid in formal text. |
Correct Usage in Sentences
Seeing the word in action helps cement the rule. Notice how until functions as a preposition (followed by a noun) or a conjunction (followed by a clause). In all cases, the spelling remains the same.
- Time constraints: “The shop remains open until 9:00 PM.” (Not untill)
- Events: “We will wait until the rain stops before leaving.”
- Negative emphasis: “You cannot watch TV until you finish your homework.”
If you were to use “Till” in these sentences, it would look like this:
- “The shop remains open till 9:00 PM.”
- “We will wait till the rain stops.”
Both versions are correct, but “Untill” with double “l” is never an option in modern grammar.
Common Misconceptions
Why does “Untill” persist if it is wrong? Visual symmetry plays a role. We are used to seeing double “l” words like bell, cell, tell, and still. When we type fast, our fingers naturally want to double-tap that last key.
Also, confusion arises from the word installment (which has two “l”s) versus instalment (one “l”), where both can be correct depending on whether you are using American or British English. Until does not have this flexibility. Whether you are in New York, London, or Sydney, it is always spelled with one “l”.
⚠️ Caution: Spellcheckers in Word, Google Docs, and browsers will almost always underline untill in red. If you see that red line, trust it. Delete the extra “l”.
