What Form 5558 can extend
Form 5558 can request additional time for Form 5500, Form 5500-SF, Form 5500-EZ and Form 8955-SSA, subject to the current instructions.
How much extra time
The current form generally allows an extension no later than the 15th day of the third month after the normal due date. The exact requested date belongs on the form.
When to file
The extension request must be filed on or before the normal due date of the return/report for which the extension is requested.
Electronic filing
Beginning January 1, 2025, the IRS states that Form 5558 may be filed electronically through EFAST2 or filed on paper with the IRS. Confirm the current method and instructions for the filing year.