AAT Level 2 Business Environment Practice Test

Closing a professional email should match the level of formality and respect appropriate for the relationship. For a project update to a supervisor, you want a closing that is professional but not overly stiff. Best regards fits nicely because it’s a standard, widely accepted sign-off in business communication. It conveys courtesy and a cooperative, professional tone, which is exactly what you want when updating someone you report to.

Other closings are less suitable here because they shift the tone. Kind regards is polite and professional but a touch warmer; it’s fine, but Best regards is the more neutral default for work updates. Regards is brief and can feel a bit curt, especially for formal updates. Yours sincerely is very formal and traditional, often reserved for formal letters rather than routine internal emails, so it can come across as unnecessarily stiff in this context.