Why might it be a bad idea to invest 100% of your 401(k) into a stock index fund?
At your age, I don't think its a bad idea to invest entirely in stocks. The concern with stocks is their volatility, and at 40+ years from retirement, volatility does not concern you. Just remember that if you ever want to call upon your 401(k) for anything other than retirement, such as a down payment on a home (which is a qualified distribution that is not subject to early distribution penalties), then you should reconsider your retirement allocations. I would not invest 100% into stocks if I knew I were going to buy a house in five years and needed that money for a down payment. If your truly saving strictly for a retirement that could occur forty years in the future, first good for you, and second, put it all in an index fund. An S&P index has a ridiculously low expense ratio, and with so many years away from retirement, it gives you an immense amount of flexibility to choose what to do with those funds as your retirement date approaches closer every year. I've read a nice rule of thumb somewhere that you should consider: You should invest (100-YOURAGE)% of your money in stock The rest should be something less volatile and more liquid, so you have some money when the stock market goes down and you need some money nevertheless. So you would start with buying about 75% stock and balance your stock percentage over time by buing more secure assets to keep the stock percentage at the desired level. At some time you might need to  sell stock to rebalance and invest in more secure assets.
Former pension/retirement/401(k) administrator here.  1.  If you don't want to bother with maintaining your own investments, you can 'roll-over' your existing 401(k) into *your new company's 401(k) plan*.  Then you will choose your investments in the new plan, you will be 100% vested in 'rollover account'.  2.  If you want control over your own investments (recommended!) you can roll over your existing 401(k) into an IRA (Individual Retirement Account).  Then *your entire account* will go into your new IRA.  3.  You can take part, or all, of your existing account as cash, paid directly to you.  Note that this will trigger *20% mandatory Federal Withholding* on whatever goes straight to you.  So some of your money is going to the IRS. First, you need to understand the difference in discussing types of investments and types of accounts. Certificate of Deposits (CDs), money market accounts, mutual funds, and stocks are all examples of types of investments. 401(k), IRA, Roth IRA, and taxable accounts are all examples of types of accounts. In general, those are separate decisions to make.  You can invest in any type of investment inside any type of account.  So your question really has two different parts:   Tax-advantaged retirement accounts vs. Standard taxable accounts FDIC-insured CDs vs. at-risk investments (such as stock mutual funds) Retirement accounts are special accounts allowed by the federal government that allow you to delay (or, in some cases, completely avoid) paying taxes on your investment.  The trade-off for these accounts is that, in general, you cannot access any of the money that you put into these accounts until you get to retirement age without paying a steep penalty.  These accounts exist to encourage citizens to save for their own retirement.  Examples of retirement accounts include 401(k) and IRAs. Standard taxable accounts have no tax advantages, but no restrictions, either.  You can put money in and take money out whenever you like.  However, anything that your investment earns is taxable each year. Inside any of these accounts, you can invest in FDIC-insured bank accounts, such as savings accounts or CDs, or you can invest in any number of non-insured investments, including money market accounts, bonds, mutual funds, stocks, precious metals, etc. Something you need to understand about investing in general is that your potential returns are directly related to the amount of risk that you take on.  Investing in an insured investment, which is guaranteed by the government to never lose its value, will result in the lowest potential investment returns that you can get. Interest-bearing savings accounts are currently paying less than 1% interest.  A CD will get you a slightly higher interest rate in exchange for you agreeing not to withdraw your money for a period of time. However, it takes a long time for your investments to grow with these investments.  If you are earning 1%, it takes 72 years for your investment to double. If you are willing to take some risk, you can earn much more with your investments.  Bonds are often considered quite safe; with a bond, you loan money to a government or corporation, and they pay you back with interest.  The risk comes from the possibility that the government or corporation won't pay you back, so it is important to choose a bond from an entity that you trust. Stocks are shares in for-profit companies.  Your potential investment gain is unlimited, but it is risky, as stocks can go down in value, and companies can close.  However, it is important to note that if you take the largest 500 stocks together (S&P 500), the average value has consistently gone up over the long term.  In the last 35 years, this average value has gone up about 11%.  At this rate, your investment would double in less than 7 years. To avoid the risk of picking a losing stock, you can invest in a mutual fund, which is a collection of stocks, bonds, or other investments.  The idea is that you can, with one investment, invest in many stocks, essentially earning the average performance of all the stocks.  There is still risk, as the market can be down as a whole, but you are insulated from any one stock being bad because you are diversified. If you are investing for something in the long-term future, such as retirement, stock mutual funds provide a good rate of return at an acceptably-low level of risk, in my opinion. "Well.... If you have alllll your money invested, and then there's a financial crisis, and there's a personal crisis at the same time (e.g. you lose your job) then you're in big trouble. You might not have enough money to cover your bills while you find a new job. You could lose your house, ruin your credit, or something icky like that.  Think 2008. Even if there's not a financial crisis, if the money is in a tax-sheltered retirement account then withdrawing it will incur ugly penalities. Now, after you've got an emergency fund established, things are different. If you could probably ride out six to twelve months with your general-purpose savings, then with the money you are investing for the long term (retirement) there's no reason you shouldn't invest 100% of the money in stocks. The difference is that you're not going to come back for that money in 6 months, you're going to come back for it in 40 years. As for retirement savings over the long term, though, I don't think it's a good idea to think of your money in those terms. If you ever lose 100% of your money on the stock market while you've invested in diversified instruments like S&P500 index funds, you're probably screwed one way or another because that represents the core industrial base of the US economy, and you'll have better things to worry about, like looking for a used shotgun. Myself, I prefer to give the suggestion ""don't invest any money in stocks if you're going to need to take it out in the next 5 years or so"" because you generally shouldn't be worried about a 100% loss of all the money in stocks your retirement accounts nearly so much as you should be worried about weathering large, medium-term setbacks, like the dot-com bubble crash and the 2008 financial crisis. I save the ""don't invest money unless you can afford to lose it all"" advice for highly speculative instruments like gold futures or social-media IPOs. Remember also that while you might lose a lot of your money on the stock market, your savings accounts and bonds will earn you pathetic amounts by comparison, which you will slowly lose to inflation. If you've had your money invested for decades then even during a crash you may still be coming out ahead relative to bonds." The money that you have under your control (e.g. in bank accounts, savings accounts, taxable investments, etc) is your money and there is no tax of any kind (either in India or in US) that needs to be paid when the money is transferred to India. As Dheer's answer says, you need to transfer all these monies within 7 years as per Indian tax law. For your 401(k) account, assuming that all the money is tax-deferred (i.e. you contributed to a regular 401(k) and not a Roth 401(k)), you will have separated from service as far as US tax law is concerned. So, check if it is at all possible to roll over the money into a similar scheme in India, specifically the Employees Provident Fund. Wikipedia says The schemes covers both Indian and international workers (for countries with which bilateral agreements have been signed; 14 such social security agreements are active). and so a rollover might be possible. If not, you could withdraw small amounts each year and avoid US income tax (but not the 10% excise tax), but how long you can continue holding 401(k) assets after return to India and whether that is long enough to drain the 401(k) are things that you need to find out. "Answers: 1. Is this a good idea? Is it really risky? What are the pros and cons? Yes, it is a bad idea. I think, with all the talk about employer matches and tax rates at retirement vs. now, that you miss the forest for the trees. It's the taxes on those retirement investments over the course of 40 years that really matter. Example: Imagine $833 per month ($10k per year) invested in XYZ fund, for 40 years (when you retire). The fund happens to make 10% per year over that time, and you're taxed at 28%. How much would you have at retirement? 2. Is it a bad idea to hold both long term savings and retirement in     the same investment vehicle, especially one pegged to the US stock     market? Yes. Keep your retirement separate, and untouchable. It's supposed to be there for when you're old and unable to work. Co-mingling it with other funds will induce you to spend it (""I really need it for that house! I can always pay more into it later!""). It also can create a false sense of security (""look at how much I've got! I got that new car covered...""). So, send 10% into whatever retirement account you've got, and forget about it. Save for other goals separately.  3. Is buying SPY a ""set it and forget it"" sort of deal, or would I need     to rebalance, selling some of SPY and reinvesting in a safer vehicle     like bonds over time? For a retirement account, yes, you would. That's the advantage of target date retirement funds like the one in your 401k. They handle that, and you don't have to worry about it. Think about it: do you know how to ""age"" your account, and what to age it into, and by how much every year? No offense, but your next question is what an ETF is! 4. I don't know ANYTHING about ETFs. Things to consider/know/read? Start here: http://www.investopedia.com/terms/e/etf.asp 5. My company plan is ""retirement goal"" focused, which, according to     Fidelity, means that the asset allocation becomes more conservative     over time and switches to an ""income fund"" after the retirement     target date (2050). Would I need to rebalance over time if holding     SPY? Answered in #3. 6. I'm pretty sure that contributing pretax to 401k is a good idea     because I won't be in the 28% tax bracket when I retire. How are the     benefits of investing in SPY outweigh paying taxes up front, or do     they not? Partially answered in #1. Note that it's that 4 decades of tax-free growth that's the big dog for winning your retirement. Company matches (if you get one) are just a bonus, and the fact that contributions are tax free is a cherry on top. 7. Please comment on anything else you think I am missing I think what you're missing is that winning at personal finance is easy, and winning at personal finance is hard" The managers of the 401(k) have to make their money somewhere.  Either they'll make it from the employer, or from the employees via the expense ratio.  If it's the employer setting up the plan, I can bet whose interest he'll be looking after. Regarding your last comment, I'd recommend looking outside your 401(k) for investing.  If you get free money from your employer for contributing to your 401(k), that's a plus, but I wouldn't -- actually, I don't -- contribute anything beyond the match.  I pay my taxes and I'm done with it. In summary, you are correct that the goal of investing is to maximize returns, while paying low management fees.  Index investing has become very popular because of the low fees.  There are many actively traded mutual funds out there with very high management fees of 2.5% and up that do not beat the market.  This begs the question of why you are paying high management fees and not just investing in index funds. Consider maxing out your tax sheltered accounts (401(k) and ROTH IRA) to avoid even more fees on your returns. Also consider having a growth component of your portfolio which is generally filled with equity, along with a secure component for assets such as bonds.  Bonds may not have the exciting returns of equity, but they help to smooth out the volatility of your portfolio, which may help to keep peace of mind when the market dips. The math works out so that the 401k is still a better deal in the long term over a taxable account because of the tax-deferred growth. Let's assume you invest in an S&P 500 index fund in either a taxable investment account or a 401k and the difference in fees is .5%. I used an online calculator and a hypothetical 1k/year investment over 30 years with 4.5% tax-deferred growth vs 5% taxable and a 25% tax bracket. After 30 years the tax-deferred 401k account will have $67k and the taxable account will have $58k. The math isn't perfect -- I'm sure I'm missing some intricacies with dividends/capital gains distributions and that you'll then pay income tax on the 401k upon retirement as you drawn down, but it still seems pretty clear that the 401k will win in the long run, especially if you invest more than the 1k/year used in my example. But yeah, .84% expenses on an index fund is robbery. Can you bring that to the attention of the HR department? Maybe they'll want to look for a lower-fee provider and it's in their best interest too, if they also participate.