It doesn’t matter one bit when anyone else did THEIR financial aid application forms. You need to do yours adhering to the deadlines your schools have.
The smartest thing is to see what the earliest deadline is for your schools…and submit all of your forms to all of your schools by that date.
Personally, I would get those 2014 taxes done ASAP, and submit the financial aid application materials ASAP. Just get it done.
If taxes aren’t done by any deadlines you submit them with estimates for 2014 income and actual asset information. The fafsa can be updated later online when taxes are done. The schools will tell you how they want updated information for CSS to be provided to them.
You need to go to the web sites of colleges you applied to and get the deadlines for each one. In my D’s case, some were due two days ago on the 1st, a few not until the 15th.