It is highly likely you will be asked to provide a tax transcript since you didn’t use the IRS DRT. The colleges need to verify that what you entered on the FAFSA is actually what is ON your tax return.
So…if you don’t link to that IRS DRT, plan to provide a tax transcript.
It also sounds like you are low income with a low EFC per FAFSA. That being the case, the schools will want the info because you are asking for a lot of money…right?
What FAFSA deadline has passed? Did you apply early decision someplace? Or what?
The date of your initial submission is the date schools consider your submission date. So you don’t have to worry about that.