 I'm Jill Nadeau. This is a Fox News Alert. The change journey. Unplanned expenses often feel like they come at the worst possible times. Setting up an emergency fund is essential for your financial health and reduce stress. Here are some answers to common questions to get you started. How much should I save? The amount you need in an emergency fund depends on your lifestyle. A good rule of thumb is to save at least three months worth of expenses.