The sign-off at the bottom of a business email gets almost no deliberate attention. Most writers pick one in their first week at a job and then never think about it again. That's a small but consistent mistake, because the closing phrase is the last impression your email leaves before the reader moves on.
This isn't about choosing between "Best" and "Kind regards" based on personal taste. The right sign-off depends on three things: who you're writing to, what the email is asking, and what relationship you want to signal. Get those three aligned and the closing reinforces your message. Get them wrong and even a well-written email can feel slightly off.
Why the sign-off carries more weight than it looks
Readers process email closings quickly, but they process them. A closing that matches the tone of the rest of the email reads as smooth and professional. One that clashes with it creates a small but real moment of friction. Imagine a firm complaint email that ends with "Cheers!" or a warm thank-you that closes with "Regards." Neither is catastrophically wrong, but both leave the reader with a mismatch they can feel without quite naming.
There's also a credibility angle. Sign-offs that try too hard ("Warmly and with appreciation") or not hard enough ("Thx") both signal a lack of judgment. The goal is a closing that feels natural, appropriate, and consistent with everything above it. That's a craft decision, not just a reflex.
The four categories of professional sign-off
Most business email closings fall into four clusters, each with a different tonal register.
Neutral and widely safe. "Best regards," "Kind regards," "Regards," and "Best" all sit here. They work across most professional contexts without ever feeling wrong. "Regards" alone is slightly cooler than "Best regards," which is worth knowing if you're writing to someone you've never met. "Best" on its own reads as warm but casual, so use it with existing relationships rather than cold introductions.
Formal and deferential. "Yours sincerely," "Yours faithfully," and "Respectfully" belong in this group. If you're writing to a very senior person for the first time, to a government body, or in a legal or regulated context, these are the right tools. "Yours faithfully" traditionally pairs with letters addressed to "Dear Sir or Madam" (a salutation that's worth reconsidering anyway, as covered in our piece on why "Dear Sir or Madam" has better alternatives). "Yours sincerely" pairs with a named recipient.
Warm and conversational. "Thanks," "Many thanks," "Thank you," and "Cheers" live here. These work well in internal emails, ongoing client relationships, and any context where the email itself has a friendly register. "Thanks" as a sign-off is not a lazy option. It works especially well when the email contains a request, because it pre-emptively acknowledges the reader's effort without crossing into the territory of thank you in advance, which can read as presumptuous if handled clumsily.
Action-oriented closings. "Let me know if you have any questions," "Happy to jump on a call," or "Looking forward to hearing from you" aren't traditional sign-offs, but they serve a similar purpose. They close the email on a forward-looking note and make it easy for the reader to respond. These work best when the email is asking for a decision or reply. Use them sparingly in purely informational messages or they feel like pressure.
Matching the closing to the context
A few specific situations catch writers out.
Replying to a complaint or difficult situation. Keep the closing neutral and avoid anything that reads as breezy. "Kind regards" works. "Cheers" does not. The reader who's just described a problem they're having doesn't want to feel brushed off by a casual goodbye.
First contact with a senior person. Go one level more formal than you think you need to. You can always relax later. Starting formal and scaling back is easy. Starting casual and trying to recover is not.
Internal emails to colleagues you know well. These don't always need a sign-off at all. A quick "Thanks" or nothing beyond your name is perfectly normal in ongoing threads. Over-formality in internal communication reads as stiff or passive-aggressive in context.
Emails to international recipients. Stick to neutral sign-offs. "Cheers" reads as informal in British and Australian English but can read as slightly odd to readers from other regions. "Best regards" travels well in almost every professional culture.
Sign-offs to avoid
Some closings have specific problems worth flagging directly.
"Warm regards" is fine. "Warmly" on its own tips into slightly over-familiar territory for a first email. "With warmth and appreciation" crosses into the territory that makes readers do a small double-take. One adjective is enough.
"Hoping this finds you well" isn't technically a sign-off, but it migrates to the bottom of some emails and it reads as filler. If you want to open or close warmly, choose a word that means something specific. The phrase "with best regards" and what it signals is something worth thinking through carefully, as explored in our guide on how and when to use "with best regards."
"XOXO" or any other social-media closing belongs nowhere in professional email. This is obvious, but it still happens.
Signing off with just your name and no closing at all works in short replies where the context is very clear. It reads as efficient rather than rude when the relationship is established. In a first email to someone you've never met, it reads as abrupt.
What consistency actually signals
Using the same sign-off in every email isn't a sign of creativity, but it isn't necessarily a weakness either. Consistency across your emails builds a small, recognisable professional identity. People who work with you regularly will register it without consciously noticing, and that's fine. Where consistency becomes a problem is when your default sign-off doesn't fit the specific email you're sending. A fixed sign-off should be a neutral one, not a warm one, precisely so it doesn't jar against more formal messages.
The most useful habit is a half-second check before sending: does this closing match the tone of the rest of the email? If the answer is yes, send it. If the answer is "I'm not sure," change it. It takes three words and costs nothing.