Tax-Efficient Investing: Fund Choice, Asset Location, and What Each Holding Costs You in Tax

Two investors can own the same mix of stocks and bonds and end up with different amounts after tax. The difference comes from two choices: which funds hold the assets, and which accounts hold the funds. This guide covers both. It explains why ETFs rarely distribute capital gains, which dividends get the lower rate, why international funds and municipal bonds belong in a taxable account for some investors and not others, and it runs a 20-year test of the same portfolio in two placements.

Related topics are covered elsewhere. Planning which years to realize income, convert to Roth, or fill a bracket is in our investment tax planning guide. Holding periods, rates on sales, and ways to defer or avoid gains are in the capital gains tax guide. Selling losers for a deduction, and the wash-sale rule, are in our tax-loss harvesting guide. Owning the individual stocks of an index to harvest losses at the position level is in the direct indexing guide.

The tax character of what you hold

Every holding produces income with a tax label, and the label decides how much of the return you keep in a taxable account. Using the 2026 federal figures from Rev. Proc. 2025-32:

The 3.8% net investment income tax applies on top of these rates to investment income above modified AGI of $200,000 (single) or $250,000 (joint). Those thresholds are not indexed for inflation. Tax-exempt muni interest is not subject to it.

A dividend is qualified only if you meet a holding period: more than 60 days during the 121-day period that begins 60 days before the ex-dividend date, according to IRS Publication 550. The fund has to meet the same test on the shares it owns, and it reports the qualified portion in box 1b of your Form 1099-DIV. A broad US stock index fund usually reports nearly all its dividends as qualified. A fund that trades frequently or holds stocks from countries without a US tax treaty reports less.

REIT dividends are mostly ordinary income because REITs deduct what they pay out and pay no corporate tax on it. The Section 199A deduction lets individuals deduct 20% of qualified REIT dividends, so a top-bracket investor pays 29.6% instead of 37%. The One Big Beautiful Bill Act made that deduction permanent in July 2025; before that it was scheduled to end after 2025. Our REIT guide covers REITs as investments.

Why ETFs rarely distribute capital gains

When a mutual fund's investors redeem, the fund usually sells securities for cash. If those securities have gained value, the fund realizes the gain, and the law requires it to distribute net gains to the shareholders who remain. You can owe tax on a distribution in a year you sold nothing and even in a year the fund lost money.

Most ETFs avoid this. Large redemptions happen through authorized participants, and the ETF pays them with a basket of securities instead of cash. A fund that hands out appreciated shares this way does not realize the gain, so the ETF can pick its lowest-basis lots to give away and shed built-in gains over time. Morningstar surveyed about 1,600 ETFs in December 2025 and found that only 6% expected any capital gain distribution for 2025 and 2% expected one above 1% of NAV. The final count, from Morningstar data cited by State Street, was 7% of ETFs against 52% of mutual funds. Among index funds alone, 4% of passive ETFs paid a capital gain against 41% of passive mutual funds. (State Street sells ETFs, but the underlying counts are Morningstar's.)

The amounts are large. The 2026 ICI Fact Book reports that mutual fund shareholders reinvested $704 billion of capital gains distributions paid during 2025. Much of that sat in retirement accounts, where it does no harm. In a taxable account it is a bill for gains you did not choose to take.

The ETF advantage has limits. Morningstar notes that India, Brazil, China, South Korea, and Taiwan do not allow in-kind transfers, so emerging-market ETFs that hold those shares sell for cash and can distribute gains. Funds that get their exposure through swaps, and funds holding securities that cannot move in kind, have the same problem. ETFs do not help with dividends or interest either; a bond ETF's income is taxed the same way as a bond mutual fund's.

Target-date and other actively managed mutual funds are the riskiest holdings for a taxable account. In January 2025 Vanguard agreed to pay $106.41 million to settle SEC charges over its retail target-date funds: after it cut the minimum for its institutional versions from $100 million to $5 million in December 2020, newly eligible investors switched, the retail funds sold appreciated holdings to pay them, and investors who held the retail funds in taxable accounts received large capital gains distributions.

Foreign stock funds and the foreign tax credit

Most countries withhold tax on dividends paid to foreign investors, and a US fund that owns their stocks pays that tax. If the fund elects to pass the tax through, your Form 1099-DIV shows your share, and you can claim a foreign tax credit that offsets US tax dollar for dollar, as described in IRS Publication 514. If your creditable foreign taxes are $300 or less ($600 joint), all of the foreign income is passive, and it is reported to you on a 1099, you can claim the credit directly on Form 1040 without filing Form 1116.

That credit exists only in a taxable account. An IRA or 401(k) pays no US tax to offset, so the withheld tax is a pure cost. Illustration: $200,000 in an international index fund whose foreign taxes paid equal 0.25% of assets a year (an assumed figure; check your fund's annual report) generates $500 of foreign tax. In a taxable account that $500 comes back as a credit. In an IRA it is gone every year.

The credit is one reason to put international stocks in the taxable account when the choice is between them and something that pays ordinary income. The offset is that many foreign dividends do not qualify for the lower rate, so check what share of the fund's dividends was qualified last year.

Municipal bonds at 2026 rates

A muni's appeal depends entirely on your tax rate. The tax-equivalent yield is the muni yield divided by one minus the rate you would pay on a taxable bond's interest. For a muni yielding 3.0%:

For a joint filer in 2026, the 24% bracket covers taxable income from $211,400 to $403,550, and the 32% bracket runs to $512,450. State tax pushes the break-even higher for in-state munis in high-tax states. Treasury interest, by contrast, is exempt from state tax but not federal, which narrows the comparison with munis for residents of states like California or New York.

Three details catch people out. Muni interest counts toward the provisional income that decides how much Social Security is taxed and toward the modified AGI used for Medicare IRMAA surcharges; our investment tax planning guide has the 2026 thresholds. Interest from some private activity bonds is a preference item for the alternative minimum tax. And a muni fund bought at a premium or discount has tax effects of its own when bonds mature or are sold. Munis never belong inside an IRA, where their tax exemption is wasted.

Asset location: the same portfolio, two placements

Illustration: a couple has $1 million, with $500,000 in a taxable brokerage account and $500,000 in a traditional IRA. They want half in a stock index ETF and half in a taxable bond fund. We compare two placements over 20 years.

Assumptions: stocks return 7% a year (1.5% qualified dividends and 5.5% price growth, with no capital gain distributions); the bond fund yields 4.5% of ordinary interest. Their ordinary rate is 24% now and when they withdraw from the IRA; their rate on qualified dividends and long-term gains is 15%. Taxable dividends and interest are taxed each year and reinvested. No state tax, no NIIT, no rebalancing between accounts. At the end, the taxable stock position is sold and the IRA is valued after 24% tax.

Placement A comes out $156,411 ahead, about 6.4%. Placement B loses twice: the bond interest in the taxable account is taxed at 24% every year, and the stock growth inside the IRA, which would have been taxed at 15% and only on sale, comes out as ordinary income at 24%.

The comparison is not perfectly fair, and you should know why. After tax, stocks make up 64.8% of Placement A's ending wealth and 60.0% of Placement B's, so part of A's lead is simply more exposure to the asset with the higher assumed return. A couple who wants the same after-tax risk in both cases would hold a little less stock under Placement A. The ranking also depends on the inputs. With lower bond yields or a much higher expected stock return, the gap narrows. And if the taxable stocks are never sold but passed to heirs, the step-up in basis removes the $165,009 capital gains tax and Placement A's total rises to $2,771,527.

Replacing the taxable bonds in Placement B with munis yielding 3.2% does not help this couple. At a 24% rate, 3.2% tax-free equals only 4.21% taxable, so Placement B would end at $2,409,260. Munis make sense here only for someone in the 32% bracket or higher, or when the IRA has no room left for bonds.

Placement rules that hold up

These rules follow from the tax labels above and apply in most cases. Check them against your own numbers when your accounts are very uneven in size.

1. Fill tax-deferred space (traditional 401(k) and IRA) first with holdings that pay ordinary income: taxable bond funds, REIT funds, high-yield and TIPS funds, and actively managed or high-turnover funds.
2. Put the holdings you expect to grow fastest in Roth accounts, since growth there is never taxed. For most people that means stocks, including small-cap and emerging-market funds.
3. In the taxable account, prefer broad stock index ETFs, international stock funds that pass through foreign tax credits, and munis if your bracket justifies them.
4. When you must hold bonds in a taxable account, compare after-tax yields: taxable bonds, Treasuries (state-exempt), munis, and I bonds each win for a different tax profile.
5. Keep target-date funds, balanced funds, and active mutual funds out of taxable accounts where possible. They mix asset types, so they cannot be located, and they can distribute gains you did not choose.
6. Rebalance inside tax-advantaged accounts first, where trades have no tax cost. Our rebalancing guide shows the trade-offs.

Location has costs of its own. Each account holds a different mix, so returns and risk vary by account and you have to track the whole portfolio as one. Moving an existing taxable position to a better spot usually means selling it and paying tax, which can wipe out years of location benefit. Apply these rules to new money and to accounts with no embedded gains first.

Accounts and later-life moves

Contribution limits for 2026 are $24,500 for a 401(k) and $7,500 for an IRA, and the account types are compared in our retirement planning guide. Tax efficiency also affects what you do with appreciated shares later. Giving long-held appreciated stock to a charity instead of cash avoids the capital gains tax on it, as our philanthropy guide explains, and holding it until death gives heirs a stepped-up basis. Both reward keeping low-basis stock in the taxable account and spending from other sources.

A fee-only adviser or CPA can run these numbers with your actual brackets and state; our guide to choosing a financial advisor covers how to find one.

This guide is for informational purposes only and does not constitute investment, tax, or legal advice. Tax rates and thresholds are 2026 federal figures as of September 2026 and can change; state taxes differ. The illustrations use assumed returns and rates, not forecasts. Consult a qualified tax professional before changing where you hold investments.