I've been using 'til. One of my editors did some research.
Well, I distinctly remember being told that 'til is the appropriate abbreviation for until, and that till is either a verb meaning to turn the soil or a noun meaning a cash drawer.
I can't tell who told me that, most likely due to excessive use of recreational substances in my misspent youth. I've found others online who remember being taught the same.
One post on TheFreeDictionary forum says simply, "the 'til I was so carefully (carelessly?) taught is a spelling error!"
A number of sources I regard as authoritative confirm that (the spelling error part, not the part about being taught).
Although my favorite source, Maryanne Webber, says 'til is "in widespread use (especially when a writer is attempting to replicate colloquial speech)," there's a rather large and vocal crowd that says otherwise:
- Grammarly says that "major usage dictionaries and style guides consider 'til an error." "Till isn't an abbreviation for until, but it means the same thing as until."
- Grammarist says 'til is "an unnecessary abbreviation", though they note that "many Americans mistakenly view till as incorrect" and that "prejudice against till leads many writers, especially in the U.S., to use 'til... there's no reason 'til should not be till. [I suspect that somewhere along the line one of my English teachers held that prejudice, which I then adopted]
- Grammar Girl says "you should never use 'til"
- The AP says, "till Or until. But not 'til."
- The American Heritage Dictionary of the English Language says 'til is "etymologically incorrect"
- The Chicago Manual of Style says "till. This is a perfectly good preposition and conjunction. It is not a contraction of 'until' and should not be written 'til."
- Garner's Modern English Usage calls 'til "incorrect" with "no literary history" [other sources indicate the "no literary history" part is BS, but they still say it's wrong to use 'til]
- GrammarBook says, "Always use till. You won't find a reference book anywhere that recommends 'til."
- The OED, Dictionary.com, The Free Dictionary, and more all say more or less the same thing: until, or till, but not 'til.