Although mutual funds (in USA) tend to move their position very slowly, but after 10 years or 20 years, that'd be more.

For example, if we buy a mutual fund in year 2000, and they invested in Microsoft and Oracle, and then they sold them at a gain in year 2003, are those gain subject to immediate tax? Because if the capital gain is not subject to immediate tax, doesn't the mutual tax have similar effect of an IRA or 401(k), for the "deferred tax" property?

So for example, if we buy into the fund at $50 and we sell it at $150 after 20 years, is that all "tax deferred" during that 20 years?

  • If a mutual fund sells a holding, the money remains in the fund and that’s not income for the fund so why would it be subject to tax at the time? To answer your second question, yes you only have to pay tax when you sell your shares. Commented Sep 23, 2021 at 5:02
  • So per your argument "If a mutual fund sells a holding, the money remains in the fund and that’s not income for the fund so why would it be subject to tax at the time?" we can also say "If we sell a stock and keeps the money in our brokerage account, that's not income for us so why would it be subject to tax at the time?" Commented Sep 23, 2021 at 5:07
  • Even if there were no tax until selling the fund, that would not make it equivalent to an IRA or 401(k). For qualified retirement accounts, there is no capital gains tax at all.
    – nanoman
    Commented Sep 23, 2021 at 11:40
  • The amount of US income tax that you will owe depends a lot on how the fund is managed (index fund vs. actively managed.). Also, Exchange Traded Funds (ETF) operate in a way that can save some taxes compared with a traditional mutual fund. Commented Sep 23, 2021 at 13:32
  • @Michael Tracy: Every year, I get IRS forms (1099-B, IIRC) from my mutual funds, showing capital gains and dividend income even if I've not sold any of my holdings. While the amounts are fairly small relative to what I have in the funds, they're still taxable.
    – jamesqf
    Commented Sep 23, 2021 at 16:52

3 Answers 3


If you own shares in a mutual fund in a taxable account, then whenever the mutual fund does a quarterly or annual distribution of dividends, interest, or capital gains you will receive a 1099 at the end of the year. You will then include that 1099 numbers in your income tax calculations. Depending on your income situation, and the nature of those distributions, you may owe taxes. It can be nothing if the numbers are small enough, or a lot depending on your situation. This happens even if you don't sell any shares during the year. It doesn't depend on if you reinvest the distributions, though if you do then the number of shares will grow over time.

Now if you owned the shares in a retirement account such as a traditional IRA or pre-tax 401(K), then the taxes are deferred until you start removing money from the retirement account. These dividends, interest, and capitals gains will be mentioned in the quarterly/yearly statements, but they don't have any tax impact until much later.

If the shares are owned in a Roth IRA or Roth 401(k) then the dividends, interest, and taxable gains distributed will never have a tax impact.

In a comment to another answer you said:

"I just talked to the mutual department of an brokerage house. The representative first said we do not have to pay tax on the dividend or the capital gain of the mutual fund. And then he said it depends. And then I ask him, say, if it is this FSELX fund, then do we pay tax. And then he says need to consult a tax professional (this is the standard answers every where)..."

The answer is it depends. The shares in the mutual fund can be owned in:

  • Taxable account
  • Traditional IRA
  • Roth IRA
  • Pre-tax 401(k)
  • Post-tax 401(k)
  • Roth 401(k)
  • 529 account
  • HSA

It can even be owned by another Mutual Fund or ETF which could also be owned by in one of those account types.

  • the reason is that I told him if it is 401k or IRA, then it is end of story... tax deferred no matter what -- and we both agreed on that. So I specifically said if it is an individual investment account (just a plain type of account) Commented Sep 23, 2021 at 11:23
  • so I guess what you are saying is, if it is a common individual account holding the fund, and the fund manager has the whim of "let's sell ALL Microsoft and Facebook and take all these huge gains, and then buy Apple and Google", then that year, I will need to pay tax on all that gain, even if I am holding that fund and didn't sell and didn't do anything Commented Sep 23, 2021 at 11:27
  • If they sell and make a profit and it is in a taxable account, then it might appear in a 1099. Of course during the rest of the year they might have losses which will again change the numbers. What you are describing is either an actively managed fund, or one in which the index is changing. Commented Sep 23, 2021 at 11:56
  • NIt: normally gains/earnings in Roth are never taxed, but they are taxed for the year of distribution IF you are under age 59.5 (unless disabled or for IRA only first-time homebuyer up to $10k) OR you have been in the account or plan less than 5 years. (And in most cases when subject to normal tax they are also subject to the 10% additional tax.) Commented Sep 24, 2021 at 13:49

When a mutual fund sells one of its holdings for a capital gain, the total amount of cash received the mutual fund from the sale by the holding "remains" in the fund and is usually re-invested into other holdings, stocks or bonds (or both) as the case may be, as per the prospectus of the fund. There may be other sales during the year of mutual fund holdings, not necessarily for a gain each time. However, usually once a year, typically in December, the mutual fund pays out the net capital gains (sum of all capital gains - sum of all capital losses) to the investor which the investor can choose to reinvest in the mutual fund (thereby gaining additional shares in the fund) or receive in cash. The investor usually makes the choice when opening the mutual fund account, and if none is made, the default option is to reinvest all capital gains (and dividends). However, this choice can be changed at any time by contacting the fund. Note that if the sum total of all capital losses exceed the sum total of all capital gains, for a net capital loss, the loss is retained in the fund (the fund won't demand more money from the investor to make up the loss!) and used to offset capital gains in future years (for up to eight years). However, regardless of whether the capital gains (or dividends) are received as cash, or reinvested in mutual fund and so the investor receives "no cash in hand", these amounts are taxable to the investor as capital gains (or dividends) in the year that they are distributed. The mutual find will issue a Form 1099-DIV listing all these amounts (with copy to IRS) and if these amounts are not properly listed on the investor's tax return (the investor's copy of Form 1099-DIV does not need to attached to the tax return), the IRS will come back with a query or audit.

Finally, turning to the last question asked by the OP

So for example, if we buy into the fund at $50 and we sell it at $150 after 20 years, is that all "tax deferred" during that 20 years?

if all dividend and capital gains distributions over the twenty years were received as cash and not reinvested fund, then the capital gain is not "tax-deferred" in the sense that one doesn't owe capital gains tax on unrealized gains; the capital gain occurs as of the date when the investor redeems the shares by returning them to the mutual fund company and requests cash (or re-investment into another mutual fund run by the same investment house or mutual fund company). It is worth keeping in mind that, typically, income tax is not withheld from the sale, and so there can be tax consequences such as interest and penalties for underpayment of estimated taxes unless quarterly estimated taxes are filed using IRS Form 1040-ES (and similarly for state income tax) or tax withholding from wages etc is increased to cover the tax on the capital gains.


Regular mutual funds are required to distribute capital gains/income to shareholders when they sell holdings.

So in your example in 2003, you as a shareholder of XYZ mutual fund would get a capital gain distribution entry on your 1099-DIV for the 2003 tax year. Mutual funds also adjust distributions for capital losses so in a down year there may not be any.

The reason why 401k/IRA are considered "tax advantaged" is that the US shareholder using those types of accounts doesn't need to pay the tax on such capital gains/income distributions allowing for compound growth opportunities.

The capital gain distribution from a mutual fund is different than the capital gain of the mutual fund that you bought at a $50 NAV value and sold at a $150 NAV value.

See: Capital Gains and Capital Gain Distributions for a mutual fund

Additional: https://www.investopedia.com/articles/investing/060215/how-mutual-funds-are-taxed-us.asp

  • I don't quite get it. So if in 2003, XYZ mutual fund sold all its Microsoft at $30, which was purchased at $3. So that gain of $27, do we have to pay tax on that? For simplicity, let's assume the XYZ mutual fund holds only 20 different companies, and for every one, the purchase price was $3 and the selling price in 2003 was $30, and the mutual fund manager decided to "sell everything" and buy all different stocks (hypothetically). So do we pay tax on those gain immediately in 2003? Commented Sep 23, 2021 at 5:47
  • Yes, you are correct. You will pay all of the gain in 2003. Which gets to the point of why index funds are considered to be of good value for the average consumer investor since there is generally less individual stock churn than mutual funds under active management. Commented Sep 23, 2021 at 5:52
  • ok... so I think you are saying, any churning... then we pay tax immediately... so of course if XYZ fund holds Microsoft for 30 years, then it is not subject to any tax during that 30 years... but if XYZ thinks in 2006 that Microsoft has been stagnant for 7 years and sell it all, then we are subject to any gain of that sale Commented Sep 23, 2021 at 6:27
  • so that also means, in our IRA or 401(k) account, it'd be silly to buy index funds, because IRA and 401(k) is limited amount per year. We may as well use individual account and buy index funds... but I guess any change of fund after 10 years, we still need to pay capital gain tax, vs if IRA or 401(k), we do not Commented Sep 23, 2021 at 6:30
  • Sounds about right. If MSFT pays a dividend that will be distributed but there no capital gain as there is no sale. To my understanding market Index funds don't perform the best but neither are they the worst over a long period which should be the goal of a retirement account for those who don't want to actively review funds. Regardless, deciding on which fund(s) to purchase inside/outside of a tax advantaged account is a personal choice and you can find much discussion about it online. Commented Sep 23, 2021 at 6:53

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