Tax Efficiency with Index Investing
Your tax efficient reasoning is solid for where you want to distribute your assets. ETFs are often more tax efficient than their equivalent mutual funds but the exact differences would depend on the comparison between the fund and ETF you were considering. The one exception to this rule is Vanguard funds and ETFs which have the exact same tax-efficiency because ETFs are a share class of the corresponding mutual fund.
Behind the scenes, mutual funds and ETFs are very similar.  Both can vary widely in purpose and policies, which is why understanding the prospectus before investing is so important. Since both mutual funds and ETFs cover a wide range of choices, any discussion of management, assets, or expenses when discussing the differences between the two is inaccurate.  Mutual funds and ETFs can both be either managed or index-based,  high expense or low expense, stock or commodity backed. Method of investing When you invest in a mutual fund, you typically set up an account with the mutual fund company and send your money directly to them.  There is often a minimum initial investment required to open your mutual fund account.  Mutual funds sometimes, but not always, have a load, which is a fee that you pay either when you put money in or take money out. An ETF is a mutual fund that is traded like a stock.  To invest, you need a brokerage account that can buy and sell stocks.  When you invest, you pay a transaction fee, just as you would if you purchase a stock.  There isn't really a minimum investment required as there is with a traditional mutual fund, but you usually need to purchase whole shares of the ETF.  There is inherently no load with ETFs. Tax treatment Mutual funds and ETFs are usually taxed the same.  However, capital gain distributions, which are taxable events that occur while you are holding the investment, are more common with mutual funds than they are with ETFs, due to the way that ETFs are structured.  (See Fidelity: ETF versus mutual funds: Tax efficiency for more details.)  That having been said, in an index fund, capital gain distributions are rare anyway, due to the low turnover of the fund. Conclusion When comparing a mutual fund and ETF with similar objectives and expenses and deciding which to choose, it more often comes down to convenience.  If you already have a brokerage account and you are planning on making a one-time investment, an ETF could be more convenient.  If, on the other hand, you have more than the minimum initial investment required and you also plan on making additional regular monthly investments, a traditional no-load mutual fund account could be more convenient and less expensive. "I'm in a similar situation. First, a 529 plan can be use for ""qualifying"" international schools.  There are 336 for 2015, which includes many well known schools but also excludes many schools, especially lower level or vocational schools and schools in non-English speaking countries. I ran 3 scenarios to see what the impact would be if you invested $3000 a year for 14 years in something tracking the S&P 500 Index: For each of these scenarios, I considered 3 cases: a state with 0% income tax, a state with the median income tax rate of 6% for the 25% tax bracket, and California with an income tax rate of 9.3% for the 25% tax bracket. California has an addition 2.5% penalty on unqualified distributions.  Additionally, tax deductions taken on contributions that are part of unqualified distributions will be viewed as income and that portion of the distribution will be taxed as such at the state level. Vanguard's 500 Index Portfolio has a 10 year average return of 7.63%.  Vanguard's S&P 500 Index fund has a 10 year average return of 7.89% before tax and 7.53% after taxes on distributions. Use a 529 as intended: Use a 529 but do not use as intended: Invest in a S&P 500 Index fund in a taxable account: Given similar investment options, using a 529 fund for something other than education is much worse than having an investment in a mutual fund in a taxable account, but there's also a clear advantage to using a 529 if you know with certainty you can use it for qualified expenses.  Both the benefits for correct use of a 529 and the penalties for incorrect use increase with state tax rates. I live in a state with no income tax so the taxable mutual fund option is closer to the middle between correct and incorrect use of a 529.  I am leaning towards the investment in a taxable account." If you can still work, I think a very good course of action would be to invest the majority of the money in low-cost index funds for many years. The reason is that you are young and have plenty of time to build a sizable retirement fund. How you go about this course of action depends on your comfort level with managing your money, taxes, retirement accounts, etc. At a minimum, open an investment account at any of the major firms (Schwab, Fidelity, for example). They will provide you with a free financial advisor. Ideally s/he would recommend something like: Open a retirement account and invest as much as you can tax-free or tax-deferred. Since you already received the money tax-free, a Roth IRA seems like a no-brainer. Pick some low-fee equity funds, like an S&P 500 Index fund, for a large chunk of the money. Avoid individual stocks if you aren't comfortable with them. Alternatively, get a recommendation for a fixed-fee financial planner that can help you plan for your future. Above all, don't spend beyond your means! You have an opportunity to fund a very nice future for yourself, especially if you are able to work while you are still so young! There are two significant drawbacks to this type of transfer. They were the reasons why I kept my American 401(k) as-is and started funding my Canadian RRSP from zero balance. 1. Taxes - a large chunk of your 401(k) will be lost to taxes. There is probably no way to transfer the funds without making a 401(k)/IRA withdrawal, which will incur the US federal tax and the 10% early-withdrawal penalty.  When the money went into the 401(k), you got a tax deduction in the US and the tax break is supposed be repaid later when you make a withdrawal (that's basically how tax deferral works).  It's unlikely that any country will let you take a deduction first and send the payback to a foreign country.  The withdrawal amount may also be taxable in Canada (Canadians generally pay taxes on their global income and that includes pensions and distributions from foreign retirement plans).  Foreign tax credit will apply of course, to eliminate double taxation, but it's of little help if your marginal Canadian tax rate is higher than your average US tax rate. 2. Expenses. Your RRSP will have to be invested in something and mutual fund management expenses are generally higher in Canada than in the US.  For example, my employer-sponsored RRSP has a Standard & Poor's stock index fund that charges 1.5% and that is considered low-cost.  It also offers a number of managed funds with expenses in excess of 2% that I simply ignore.  You can probably invest your American 401(k)/IRA in mutual funds more efficiently. 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. "I actually love this question, and have hashed this out with a friend of mine where my premise was that at some volume of money it must be advantageous to simply track the index yourself. There some obvious touch-points: Most people don't have anywhere near the volume of money required for even a $5 commission outweigh the large index fund expense ratios. There are logistical issues that are massively reduced by holding a fund when it comes to winding down your investment(s) as you get near retirement age. Index funds are not touted as categorically ""the best"" investment, they are being touted as the best place for the average person to invest. There is still a management component to an index like the S&P500.  The index doesn't simply buy a share of Apple and watch it over time.  The S&P 500 isn't simply a single share of each of the 500 larges US companies it's market cap weighted with frequent rebalancing and constituent changes.  VOO makes a lot of trades every day to track the S&P index, ""passive index investing"" is almost an oxymoron. The most obvious part of this is that if index funds were ""the best"" way to invest money Berkshire Hathaway would be 100% invested in VOO.  The argument for ""passive index investing"" is simplified for public consumption.  The reality is that over time large actively managed funds have under-performed the large index funds net of fees.  In part, the thrust of the advice is that the average person is, or should be, more concerned with their own endeavors than they are managing their savings.  Investment professionals generally want to avoid ""How come I my money only returned 4% when the market index returned 7%?  If you track the index, you won't do worse than the index; this helps people sleep better at night. In my opinion the dirty little secret of index funds is that they are able to charge so much less because they spend $0 making investment decisions and $0 on researching the quality of the securities they hold.  They simply track an index; XYZ company is 0.07% of the index, then the fund carries 0.07% of XYZ even if the manager thinks something shady is going on there. The argument for a majority of your funds residing in Mutual Funds/ETFs is simple, When you're of retirement age do you really want to make decisions like should I sell a share of Amazon or a share of Exxon?  Wouldn't you rather just sell 2 units of SRQ Index fund and completely maintain your investment diversification and not pay commission?  For this simplicity you give up three basis points?  It seems pretty reasonable to me." "This may be more of a comment than an answer, but it's too long for a comment. Perhaps the Stackexchange Gods will forgive my impudence. That said: Even with the tax penalties, it can be to your advantage to put money into a ""retirement"" account and withdraw it before retirement. The trick is: Is the amount of the tax penalty more than the benefit of untaxed compound growth? For example, just to make up some numbers: Suppose you have $1000 of gross income to invest. You are considering whether to invest in an ordinary, non-tax favored account, or a classic IRA. Either way you will get 10% returns. Your tax rate, both when you put the money in and when you take it out, is 15%. There is a 10% tax penalty for early withdrawal. With an ordinary account you will pay 15% tax off the top, so you are only investing $850. Then each year 15% of your returns are paid in taxes, so your net return is 8.5%. But when you withdraw the money there are no additional taxes. With an IRA you do not pay any taxes up front, so you can invest the entire $1000. You collect 10% each year with no taxes. When you withdraw, you pay 15% plus the 10% penalty equals 25%. So after 5 years, the ordinary account would yield $850 x 1.085^5 = $1504. The IRA would yield $1000 x 1.1^5 x 0.75 = $1208. The tax penalty hurts. You are better to use the ordinary account. But if you could leave your money in for 25 years, then the ordinary account would yield $850 x 1.085^25 = $7687. The IRA would yield $1000 x 1.1^25 x 0.75 = $8126. The IRA, even with the tax penalty, is better. Of course my numbers are just made up. What your tax bracket is, what returns you get, and how long you think you might leave the money in the investment, all vary." I believe the answer to your question boils down to a discussion of tax strategies and personal situation, both now and in the future.  As a result, it's pretty hard to give a concrete example to the question as asked right now. For example, if your tax rate now is likely to be higher than your tax rate at retirement (it is for most people), than putting the higher growth ETF in a retirement fund makes some sense.  But even then, there are other considerations. However, if the opposite is true (which could happen if your income is growing so fast that your retirement income looks like it will be higher than your current income), than you might want the flexibility of holding all your ETFs in your non-tax advantaged brokerage account so that IF you do incur capital gains they are paid at prevailing, presumably lower tax rates.   (I assume you meant a brokerage account rather than a savings account since you usually can't hold ETFs in a savings account.) I also want to mention that a holding in a corp account isn't necessarily taxed twice.  It depends on the corporation type and the type of distribution.  For example, S corps pay no federal income tax themselves. Instead the owners pay taxes when money is distributed to them as personal income.  Which means you could trickle out the earnings from an holdings there such that it keeps you under any given federal tax bracket (assuming it's your only personal income.)   This might come in handy when retired for example.   Also, distribution of the holdings as dividends would incur cap gains tax rates rather than personal income tax rates. One thing I would definitely say: any holdings in a Roth account (IRA, 401k) will have no future taxes on earnings or distributions (unless the gov't changes its mind.)  Thus, putting your highest total return ETF there would always be the right move.