Do you want to decide which payment plan suits you based on your income?
it's not what i want
If I have to certify my income every year, what should I do with my family's data?
You must provide your loan servicer with up-to-date income and family size information so that your servicer can recalculate your payment. even if there is no change.
in case of having loans from the FFEL Program. What I can do?
if you want a plan your only income based payment plan option is the IBR Plan
under what conditions will my AGI be used?
One of the conditions is if you filed a federal tax return in the last two years.
If that is my case, what else?
in this case your current income is not significantly different from the income reported on your most recent federal tax return
but this last does not apply to me