<prompt> Human: I guess I just dont understand, what benefits do you get? If I havent done my taxes yet I dont know how much I owe. How can I pay when I dont know what I owe? This extension thing doesnt make sense to me.  <response>: The penalty for filing late with a balance due is significantly more than the penalty for paying late with a balance due. How can I pay when I dont know what I owe?Guess. If you overpay you can claim a refund. 