If your parents are amending their 2017 tax return…you need to put what they are actually filing for 2017. Frankly, until this is done…you should just wait unless you have a deadline you must meet. Fact is…they are amending their tax return, but you don’t really KNOW what they will end up doing for the 2017 tax year.
In addition, if they are amending the tax form, it should be because there is an error on the original 2017 submission. If that is the case, how would you complete your FAFSA anyway? You don’t have accurate 2017 tax year information…yet.
And lastly, if they amend their 2017 tax return, you will NOT be able to use the IRS Dta Retrieval Tool when completing your FAFSA…so…they will need to order a tax transcript because your school will probably require this.