Furthermore there is no European Premier League to be confused with. I do accept the potential confusion between EPL and IPL if one only refers to English Premier League as premier-league. I believe EPL should be as acceptable as a tag as NBA, or NFL is. Likewise I see potential is having tags for other major leagues such as: la-liga (Spain), serie-a (Italy) and 1.bundesliga (Germany); similarly champions-league and uefa-league for the two major competitions in europe would be acceptable. The motivation behind my opinion is that the regulations governing matches and teams are different in between these competitions.
Bottomline here is essentially that the ones who might not recognize the abbreviation are most likely to be people who would not be able to answer the question in the first place. Considering that any one of the above-mentioned tags should be accompanied with football tag, anyone who might not feel at home with the abbreviation but still interested in learning about some regulation concerning football would still have enough clue to be drawn into checking the question out.