What is the correct punctuation for dba?

"dba" stands for "doing business as" and is generally used as an abbreviation in business contexts. Here's how to punctuate it:

* No punctuation: When used as an abbreviation, "dba" is typically not punctuated. For example: "John Smith, dba Smith's Bakery."

* With periods: Some style guides might suggest using periods after each letter in the abbreviation (d.b.a.). However, this is less common and generally considered outdated.

* In parentheses: When referring to a business's legal name followed by its "doing business as" name, parentheses are often used for clarity. For example: "Smith's Bakery (dba John Smith)."

Ultimately, the best punctuation depends on your specific context and preferred style guide. However, using "dba" without any punctuation is the most common and generally accepted practice.