Final answer:
An employer must file a Form 940 if employees were employed on any day in any 20 weeks in the current or preceding calendar year. This form is essential for contributing to state unemployment programs.
Step-by-step explanation:
An employer must file a Form 940 if B. EEs were employed on any day in any 20 weeks in the current or preceding calendar year. Form 940 is the federal unemployment tax annual report form. This form is crucial to ensure that employers contribute to state unemployment programs. Employers must file this form for their employees to maintain compliance with tax regulations. It is one of the key documents, alongside forms like the 1040EZ, that play a significant role in tax filing and payment obligations in the United States.