After you file

this is something I was looking for still have one question

 

do we need to apply ITIN before tax filing date or extension date? 

for tax amendment we have 3 years timeline?

as above question/ answer clarifies we can amend taxes with ITIN application. but one question remained, is it required to be done before tax filing due date(extension date) or possible to do it after due date?

 

Thanks