I have heard the phrase “You’ll get it in the end” as, supposedly, a phrase from a Beatles song. Is it? I haven’t been able to find out which one, since the Beatles lyric website only lists lyrics by the song titles.
Top of my head… could be from Abbey Road song called The End… not sure though. Sorry I can’t be more specific but I check details right this sec.
I’m guessing “I’ll Get You”
Run For Your Life from Rubber Soul
Well I’d rather see you dead, little girl
than to be with another man.
You better keep your head, little girl
or you won’t know where I am.
You better run for your life if you can, little girl,
hide your head in the sand little girl,
catch you with another man,
that’s the end, little girl.
dont know if its what your looking for but it had “the end” in the song plus is a good song 
From Sexy Sadie
…You’ll get yours yet,
However big you think you are
I think bayonet pegged it, I just like the Sexy Sadie line. It is really about the Maharishi Mahesh Yogi.