How much do writer's agents cost?

Answer 1

Nothing up front - a good agent will take a percentage from what is made from the book once it is published. Never use an agent who charges any fees up front.

The typical agent's fee is 10-15%

Answer 2

Writer's agents typically charge a commission of 10-15% of the writer's earnings from a book deal or other forms of professional work they negotiate. Additionally, some agents may charge administrative fees or expenses related to marketing and promoting your work. Always clarify the terms of representation with your agent before entering into a contract.