Unexpected expenses are a part of life.

They can crop up at any time and often occur when you least expect them. An emergency expense is usually not a welcome one – it can include anything from car repairs to veterinary care to that field trip fee your 12 year old informed you about the day of. So, what’s the best way to deal with those financial curve balls that life inevitably throws at you? Enter one of the most important personal financial tools you can have – an emergency fund.

What is an emergency fund?

An emergency fund is essential, but it’s also simple. It’s merely a stash of cash reserved solely for a financial emergency. It’s best to keep it in a place where you can access it easily, such as a savings account or a money market fund. (It also might not hurt to keep some actual cash on hand in a safe place in your house.) When disaster strikes – e.g., your water heater dies right before your in-laws arrive for a long weekend – you can pull funds from your emergency stash to make the repairs and then feel free to enjoy a pleasant time with your family.

Some experts recommend building an emergency fund equal to about 6-12 months of your monthly expenses. Don’t let that scare you. This may seem like an enormous amount if you’ve never committed to establishing an emergency fund before. But having any amount of money in an emergency fund is a valuable financial resource which may make the difference between getting past an unexpected bump in the road, and having long term financial hindrances hanging over you, such as credit card debt.

Start where you are

It’s okay to start small when building your emergency fund. Set manageable savings goals. Aim to save $100 by the end of the month, for example. Or shoot for $1,000 if that’s doable for you. Once you get that first big chunk put away, you might be amazed at how good it feels and how much momentum you have to keep going.

Take advantage of automatic savings tools

When starting your emergency fund, it’s a good idea to set up a regular savings strategy. Take a cold, hard look at your budget. Be as objective as possible. This is a new day! Now isn’t the time to beat yourself up over bad money habits you might have had in the past, or how you rationalized about purchases you thought you needed. After going through your budget, decide how much you can realistically put away each month and take that money directly off the top of your income. This is called “paying yourself first”, and it’s a solid habit to form that can serve you the rest of your life.

Once you know the amount you can save each month, see if you can set up an automatic direct deposit for it. (Oftentimes your paycheck can be set to go into two different accounts.) This way the money can be directly deposited into a savings account each time you get paid, and you might not even miss it. But you’ll probably be glad it’s there when you need it!

Don’t touch your emergency fund for anything other than emergencies

This is rule #1. The commitment to use your emergency fund for emergencies only is key to making this powerful financial tool work. If you’re dipping into this fund every time you come across a great seasonal sale or a popular new mail-order subscription box, the funds for emergencies might be gone when a true emergency comes up.

So keep in mind: A girls’ three day weekend, buying new designer boots – no matter how big the mark-down is – and enjoying the occasional spa day are probably NOT really emergencies (although these things may be important). Set up a separate “treat yourself fund” for them. Reserve your emergency fund for those persnickety car breakdowns, unexpected medical bills, or urgent home repairs.

The underpinning of financial security

An emergency fund is about staying prepared financially and having the resources to handle life if (and when) things go sideways. If you don’t have an emergency fund, begin building one today. Start small, save consistently, and you’ll be better prepared to catch those life-sized curve balls.