The Wall Street Journal (and AllThingsD) is confirming the rumors that Yahoo plans to lay off thousands of people as soon as the end of March.

PR and marketing, “research, marginal businesses and weaker regional efforts are among those considered as potential targets.”

The company employs more than 14,000 employees plus software contractors; a source told Kara Swisher that each unit would need to show significant savings or a “clear path” to revenue growth. “It’s going to be deep,” that source said.

Final numbers have yet to be announced. A Yahoo spokesman would only email the following statement: “Our leadership is engaged in a process that will generate significant strategic change at Yahoo, but final decisions have not yet been made at this point. Beyond that, we will not comment.”