Mailing address of form 940
The mailing address for Form 940, Employer's Annual Federal Unemployment (FUTA) Tax Return, is:
Internal Revenue Service Attn: FUTA P.O. Box 530 Kirkwood, MO 63501-0530
You can also file Form 940 electronically through the Electronic Federal Tax Payment System (EFTPS) or through an authorized third-party provider.