Last week, two of my friends closed on their first home. It’s a beautiful house, great neighborhood, big yard. It’s everything they could ask for, but that perfect home is coming at quite a price.

My friends decided that now was the ideal time to buy, because home prices have dropped significantly in our area. Their logic is easy to follow: no one really knows just how low the market is going to go, so why take the risk that prices might begin to rise before they lock in that low home price? Sure, they might miss out on a significantly lower price, but then again they might not.

But, despite the low price they’ve found, my friends aren’t in a good position to buy. They didn’t save up a down payment before buying, which is usually a red flag. The mortgage crisis has guaranteed that they couldn’t get a zero-down mortgage, but they’ve managed to find the next best thing. 401(k) programs (along with some other retirement savings programs) allow you to borrow money from your account for little things like major medical expenses and purchasing a home. There are a few catches, though:

• you have to repay that money, and fast! You may have only five years to get that money back in your account or face major tax penalties.
• you lose out on any interest your retirement savings was earning.
• you often have to pay taxes or penalties on your withdrawal.

Many homeowners used their 401(k) savings to help them make a down payment, but as a general rule, it’s not a good idea. Doing so puts a person on pretty shaky financial ground: not only would you need to make your mortgage payments but you’d be making another large payment to get that money back into your retirement account. Essentially you could be putting both your new home and your retirement at risk.

Even if you’re sure that you can handle double payments, you’ll probably be better off saving up money for a down payment. Yes, you won’t get into your dream house right now, but you’ll increase your ability to keep that perfect house. And with a little effort, you may be able to surprise yourself with how fast you can save up for a down payment. You’ll have less debt overall, as well: while money withdrawn from your 401(k) is yours, the need to repay it or face penalties can turn your retirement savings from an asset into straight out debt.

My friends decided to take the risk, and that’s their — and your — choice. But piling that risk on top of a problematic real estate market seems to be asking for trouble.