401k(Photo: Getty Images/iStockphoto)Life’s little surprises tend to be painfully expensive. No matter how carefully you plan and save for a rainy day, sometimes your financial umbrella just isn’t big enough. When faced with a money emergency, some people may ask family for help, use a home equity line of credit, or even pick up a second job. Many Americans also turn to their retirement accounts, which might lead to larger problems down the road.Retirement piggy banks attract an alarming amount of early withdrawals. According to a report from HelloWallet released last year, more than one out of four households in the country turn to their 401(k) plans before retirement. In some cases, the entire account is drained in an effort to stem financial bleeding somewhere else. Early withdrawals for non-retirement reasons total approximately $60 billion per year, while 401(k) and 403(b) loans account for an additional $10 billion each year.If at all possible, given your personal financial situation, it’s typically recommended that you avoid raiding your retirement accounts. Let’s take a look at three dangers that come with early withdrawals or 401(k) loans.1. Uncle SamIf you are unable to avoid withdrawals until age 59 1/2, you will face a 10% penalty and ordinary income taxes on your traditional Individual Retirement Accounts and 401(k) plans in most cases. With a Roth IRA, you can avoid penalties and taxes on withdrawals of your contributions, but you still face a 10% penalty and taxes on withdrawals of profits unless an exception applies.You may be able to avoid the 10% penalty on retirement accounts if the distribution is due to death, disability, qualified higher education expenses, or medical expenses. First-time homebuyers may also qualify for a penalty-free distribution. However, the numbers reveal that most Americans who make early withdrawals are not receiving exceptions.According to the Internal Revenue Service, Americans paid nearly $6 billion in retirement penalties during 2011. In fact, between 2007 and 2011, workers routinely lost more than $5 billion each year due to pulling money from tax-deferred retirement accounts. A 40-year old who drains $10,000 from a retirement account could easily cost themselves $3,500 in taxes and penalties, and even more in future retirement benefits.2. Missing outIn addition to paying Uncle Sam, you also encounter an opportunity cost from not being invested in the market. Even a short absence from the market can significantly impact your long-term returns and retirement plans.When it comes to investing in the stock market everyday counts. As the chart above shows, $10,000 invested between Dec. 31, 1993, and Dec. 31, 2013, and would have grown to $58,332 if it was constantly invested in the Standard & Poor’s 500. If you missed the 10 best days during that period, the investment would have grown to only $29,111, almost half of the amount if you simply left the money untouched. By missing the 20 best days, your total is reduced to just $18,140.3. Unintended consequences Borrowing from your 401(k) plan can be one of the best options if you have a short-term liquidity crunch. A 401(k) loan is typically quick, straight-forward, and probably comes with an interest rate more attractive than traditional consumer loans or credit cards. Furthermore, you don’t have to rely on a bank lender or pass a credit check. However, borrowing from your plan without considering the downside can harm your financial health.According to a recent study by TIAA-CREF, 29% of Americans who participate in retirement plans say they have taken out a loan from their savings in the plans. Yet 44% regret the decision. Among those who took out a loan in the study, 43% have taken out two or more loans. Since these loans usually provide easy access to money, 401(k) borrowers run the risk of becoming dependent on them; 401(k) loans should not be used to supplement your overspending habits.Borrowers should also be aware that while most 401(k) loans are paid back over several years, the typical loan is due in full within two or three months if you part ways from your employer for any reason. If you are unable to pay back the loan during this time period, your loan enters default and you are subject to taxes and possibly a 10% penalty if you are under retirement age.Wall St. Cheat Sheet is a USA TODAY content partner offering financial news and commentary. Its content is produced independently of USA TODAY.