Is it "I tell you what" or "I'll tell you what"? [closed]

Very often you hear people preface what they're about to say with I tell you what. Or is it I'll tell you what?

Is it correct to say a straight I tell you what as that interjection, or do you have to mark the "L" sound at least implicitly meaning that the correct version is I'll tell you what?

This is for American English only


"I'll tell you what" is correct term because the speaker is indicating what they will do ("I'll" is short for "I will"), which is to "tell you what." However, some people skip the " 'll," so you are likely to hear both, but "I'll" is the correct one.