Due to the continuing growth in electronic filing, the IRS has announced that it will no longer mail Forms 941 to employers. Instead, you will have to retrieve forms from the IRS website: www.irs.gov/app/picklist/list/formsPublications.html. PDF forms can be filled in and saved. In addition, the IRS will no longer mail forms 940, 944, and 945.
You should check the IRS website at least quarterly since 941 forms are often updated from one quarter to the next.