It is possible to electronically file up to 3 amended returns for every tax year. If you file a third amended return which is accepted, all subsequent attempts will be rejected. For those who find out an H&R Block mistake in your return that entitles you to a bigger refund https://should-i-hire-someone-to01111.theisblog.com/35734095/the-ultimate-guide-to-how-to-file-a-1040x-with-a-tax-preparer