If you answered no to all of these questions, you must make estimated tax payments using Form 1040-ES. To avoid a penalty, your total tax payments (estimated taxes plus withholding) during the year must satisfy one of the requirements we just covered.
European Union (EU) SME Definition. In the EU, a similar system is used to define Small to Medium Enterprises. A business with a headcount of fewer than 250 is classified as medium-sized; a business with a headcount of fewer than 50 is classified as small, and a business with a headcount of fewer than 10 is considered a micro-business.
Safety Critical Element. Safety Critical Element (SCE) means such part of an installation and such of its plant (including computer programmes) or any part there of, the failure of which would cause or contribute substantially to, or a purpose of which is to prevent, or limit the effect of, a major accident.