Does it cost anything to use the FAFSA4caster?
No it does not cost anything, the FAFSA4caster gives you a free estimate of your eligibility for federal student aid.
What if I don't know the answer to some of the questions on the 4caster? Some of the information I don't have at this time.
If you don't have all the information at this time you should answer all the question that are asked by the FAFSA4caster even if you have to estimate or guess.