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why do I need an emergency fund if I already have investments?
There are a few major risks to doing something like that. First, you should never invest money you can't afford to lose. An emergency fund is money you can't afford to lose - by definition, you may need to have quick access to that money. If you determine that you need, for example, $3000 in emergency savings, that means that you need to have at least $3000 at all times - if you lose $500, then you now only have $2500 in emergency savings. Imagine what could've happened if you had invested your emergency savings during the 2008 crash, for example; you could easily have been in a position where you lost both your job and a good portion of your emergency savings at the same time, which is a terrible position to be in. If the car breaks down, you can't really say "now's a bad time, wait until the stock market bounces back." Second, with brokerage accounts, there may be a delay before you can actually access the money or transfer it to an account that you can actually withdraw cash from or write checks against (but some of this depends on the exact arrangement you have with your bank). This can be a problem if you're in a situation where you need immediate access to the money - if your furnace breaks in the middle of winter, you probably don't want to wait a few days for the sale and transfer to go through before you can have it fixed. Third, you can be forced to sell the investments at an unfavorable price because you're not sure when you're going to need it. You'd also likely incur trading fees and/or early withdrawal penalties when you tried to withdraw the money. Think about it this way: if you buy a bond that matures in 5 years, you're effectively betting that you won't have an emergency for the next 5 years. If you do, you'll have to either sell the bond or, if you're allowed to get the money back early, you'll likely forfeit a good amount of the interest you earned in the process (which kind of kills the point of buying the bond in the first place). Edit: As @Barmar pointed out in the comments, you may also have to pay taxes on the profits if you sell at a favorable price. In the U.S. at least, capital gains on stuff held for less than a year is taxed at your ordinary income tax rate and stuff held longer than a year is taxed at the long-term capital gains tax rate. So, if you hold the investment for less than a year, you're opening yourself up to the risks of short-term stock fluctuations as well as potential tax penalties, so if you put your emergency fund in stocks you're essentially betting that you won't have an emergency that year (which by definition you can't know). The purpose of an emergency fund is just that - to be an emergency fund. Its purpose isn't really to make money.