The form and instructions for amending a 2019 tax return are currently expected to be available approximately February 12. But do not file an amended return until the IRS has processed your first tax return and you have received your refund.
An amended return has to be filed on a special form, Form 1040-X. It cannot be e-filed. You have to print it, sign it, and file it by mail. It takes the IRS up to 16 weeks to process an amended return.
