Final answer:
An employer must file Form 940 by January 31 of the year following the year in which the FUTA liability was incurred.
Step-by-step explanation:
An employer must generally file Form 940 by January 31 of the year after the Federal Unemployment Tax Act (FUTA) liability was incurred. If the employer has deposited all the due FUTA tax on time, they can file the form by February 10. However, for your specific case, the correct answer is A. January 31.
FUTA is a payroll tax paid by employers based on employee wages/salaries and is used to fund state workforce agencies.