IDOC & MIT tax info deadlines

<p>The deadline I have found for MIT, Johns Hopkins and IDOC are 2/15 and 3/3. This is before my 2013 income taxes will be completed. The FAFSA instructed me to use my 2012 taxes and update the profile with my 2013 taxes when they are completed. Can I do the same with these deadlines, and if so, how would I go about this.
I am confused as to how I'm supposed to have these available to send already. I own a small busines and my taxes are a bit complex, plus I still don't have all the necessary documents to complete them.</p>