Using Forms 4868 and 2350 to extend due dates
Using Form 4868
Use Form 4868 to apply for a 6-month filing extension for the following forms: 1040, 1040-SR, 1040-NR, 1040-NR-EZ, 1040-PR, or 1040-SS.
For more information refer to the IRS Instructions for Form 4868.
Using Form 2350
Use Form 2350 to request a filing extension for Forms 1040 or 1040-SR if your client expects to file Form 2555 and the extension gives them time to meet either the bona fide residence test or the physical presence test.
For more information, refer to the IRS Instructions for Form 2350.