The 941 forms must be filed each quarter, and the due date is the last day of the month following the end of the quarter. For example, if the quarter ends on March 31, the 941 forms must be filed by April 30.
The 941 forms can be filed electronically or by paper. If you file electronically, you will need to use the IRS e-file system. To file by paper, you will need to download the 941 forms from the IRS website and print it out. After you have completed the form, you will need to mail it to the IRS.