The IRS and the U.S. Treasury department have extended the federal filing and tax payment deadlines to July 15, 2020.
For more information:
If two taxpayers filed a Married Filing Joint return that was accepted by the IRS, and want to complete amended returns to change the filing status to Married Filing Separate, please note the following:
See the Help Topic Form 1040X - How to Create An Amended Return for more information.The person with the secondary social security number on the original return will need to file a new return with a filing status of Married Filing Separately, and mail this return to the IRS.
See the Help Topic Printing, and, Mailing a Paper Return for more information.