Index ETF or Index mutual fund - standard brokerage account
The ETF is likely better in this case. The ETF will generally generate less capital gains taxes along the way.  In order to pay off investors who leave a mutual fund, the manager will have to sell the fund's assets.  This creates a capital gain, which must be distributed to shareholders at the end of the year.  The mutual fund holder is essentially taxed on this turnover.  The ETF does not have to sell any stock when an investor sells his shares because the investor sells the shares himself on the open market.  This will result in a capital gain for the specific person exiting his position, but it does not create a taxable event for anyone else holding the ETF shares. The main difference between a mutual fund and an ETF are how they are bought and sold (from the investors perspective). An ETF is transacted on the open market. This means you normally can't buy partial shares with your initial investment. Having to transact on the open market also means you pay a market price. The market price is always a little bit different from the Net Asset Value (NAV) of the fund. During market hours, the ETF will trade at a premium/discount to the NAV calculated on the previous day. Morningstar's fund analysis will show a graph of the premium/discount to NAV for an ETF. With a mutual fund on the other hand, your investment goes to a fund company, which then grants you shares while under the hood buying the underlying investments. You pay the NAV price and are allowed to buy partial shares. Usually an ETF has a lower expense ratio, but if that's equal and any initial fees/commissions are equal, I would prefer the mutual fund in order to buy partial shares (so your initial investment will be fully invested) and so you don't have to worry about paying premium to NAV
You are young, and therefore have a very long time horizon for investing. Absolutely nothing you do should involve paying any attention to your investments more than once a year (if that). First off, you can only deposit money in an IRA (of whatever kind) if you have taxable income. If you don't, you can still invest, just without the tax benefits of a Roth. My suggestion would be to open an account with a discount brokerage (Schwab, Fidelity, eTrade, etc). The advantage of a brokerage IRA is that you can invest in whatever you want within the account. Then, either buy an S&P 500 or total market index fund within the account, or buy an index-based ETF (like a mutual fund, but trades like a stock). The latter might be better, since many mutual funds have minimum limits, which ETFs do not. Set the account up to reinvest the dividends automatically--S&P 500 yields will far outstrip current savings account yields--and sit back and do nothing for the next 40 or 50 years. Well, except for continuing to make annual contributions to the account, which you should continue to invest in pretty much the same thing until you have enough money (and experience and knowledge) to diversify into bond funds/international funds/individual stocks, etc. Disclaimer: I am not a financial planner. I just manage my own money, and this strategy has mostly kept me from stressing too badly over the last few years of market turmoil. "Vanguard's Admiral shares are like regular (""investor"") shares in their funds, only they charge lower expense ratios. They have higher investment minimums, though. (For instance, the Vanguard Total Stock Market Index Fund has a minimum of $3,000 and an expense ratio of .18% for the Investor Shares class, but a minimum of $10,000 and an expense ratio of .07% for Admiral Shares). If you've bought a bunch of investor shares and now meet the (recently-reduced) minimum for Admiral shares, or if you have some and buy some more investor shares in the future and meet the minimums, you will qualify for a free, no-tax-impact conversion to the Admiral Shares and save yourself some money. For more information, see the Vanguard article on their recent changes to Admiral Shares minimums. Vanguard also offers institutional-class shares with even lower expense ratios than that (with a minimum of $5 million, .06% expense ratios on the same fund). A lot of the costs of operating a fund are per-individual, so they don't need to charge you extra fees for putting in more money after a certain point. They'd rather be competitive and offer it at cost. Vanguard's funds typically have very low expense ratios to begin with. (The investor shares I've been using as an example are advertised as ""84% lower than the average expense ratio of funds with similar holdings"".) In fact, Vanguard's whole reason for existing is the premise (stated in founder John C Bogle's undergraduate thesis at Princeton) that individuals can generally get better returns by investing in a cheap fund that tracks an index than by investing in mutual funds that try to pick stocks and beat the index and charge you a steep markup. The average real return of the stock market is supposedly something like 4%; even a small-looking percentage like 1% can eat a big portion of that. Over the course of 40 years waiting for retirement, saving 1% on expenses could leave you with something like 50% more money when you've retired. If you are interested in the lower expense ratios of the Admiral share classes but cannot meet the minimums, note that funds which are available as ETFs can be traded from Vanguard brokerage accounts commission-free and typically charge the same expense ratios as the Admiral shares without any minimums (but you need to trade them as individual shares, and this is less convenient than moving them around in specific dollar amounts)." "I'd also look into index funds (eg Vanguard) as they have low management fees. you can buy these as ETFs as well - so you can buy in at a very low starting amount. An index fund can also be a talking point for your kids about what an industry index is and how it relates to the companies that fall into it. Also about how mutual funds try to ""beat the market"" - and often fail." What account you put it in depends on why you have those different accounts.  First, if you have them due to regulatory requirements, then you of course must follow said regulations. I doubt that's the case here.  Otherwise, you might be splitting based on how they trade (ETFs trade as stocks) or you could be splitting based on how you build a portfolio out of them.  When you build a non-speculative stock portfolio, you typically want to limit your holdings in a single stock to a fairly small portion of your portfolio (say, 3%) to limit your exposure to bad stuff happening to a single company. That doesn't apply nearly a much to mutual funds, especially index funds. ETFs are much more like mutual funds here.  You can also, of course, create an ETF account and put them there. You also say you have a market index account, what is that used for? One advantage not pointed out yet is that closed-end funds typically trade on stock exchanges, whereas mutual funds do not.  This makes closed-end funds more accessible to some investors. I'm a Canadian, and this particular distinction matters to me.  With my regular brokerage account, I can buy U.S. closed-end funds that trade on a stock exchange, but I cannot buy U.S. mutual funds, at least not without the added difficulty of somehow opening a brokerage account outside of my country. Lots of good answers.  I'll try and improve by being more brief.  For each option you will pay different taxes: Index Fund:   Traditional IRA Roth IRA You can see that the Roth IRA is obviously better than investing in a taxable account.  It may not be as obvious that the traditional IRA is better as well.  The reason is that in the traditional account you can earn returns on the money that otherwise would have gone to the government today.  The government taxes that money at the end, but they don't take all of it. In fact, for a given investment amount X and returns R, the decision of Roth vs Traditional depends only on your tax rate now vs at retirement because X(1-tax)(1+R_1)(1+R_2)...(1+R_n) = X(1+R_1)(1+R_2)...(1+R_n)(1-tax) The left hand side is what you will have at retirement if you do a Roth and the right hand side is what you will have at retirement if you do traditional.  Only the tax rate differences between now and retirment matter here.  An index fund investment is like the left hand side but has some additional tax terms on your capital gains.  It's clearly worse than either. Maxing out an IRA would probably be step 1, if you exceed that probably just aim for saving in a taxable brokerage account. Just try and stick to ETFs if you're gonna index since they're slightly more tax efficient than a mutual fund I think it's great idea.  Many large brokerages give customers access to a pretty sizable list of zero commission, zero load funds.  In this list of funds will certainly be an S&P 500 index.  So you can open your account for free, deposit your $1,000 for free and invest it in an S&P index for no cost.  You'll pay a very negligible amount in annual expense fees and you'll owe taxes on your gain if you have to use the money.  I don't follow the school of thought that all investment money should be in retirement account jail. But I think if you have your spending under control, you have your other finances in order and just want to place money somewhere, you're on the right track with this idea.