How tax drag works
Tax drag arises wherever investment income is taxed as it arrives, which in practice means a taxable brokerage account. Each year you owe tax on the interest and dividends your holdings pay, even if you reinvest every cent, and on capital gains a fund distributes or you realize by selling.
The cost depends on the kind of income. Interest from bonds, CDs and savings is taxed as ordinary income at rates up to 37%. Qualified dividends and long-term gains are taxed at 0%, 15% or 20%. A mutual fund’s capital gain distributions count as long-term gains however long you have owned the shares, but its short-term gains arrive as ordinary dividends. Above $200,000 of modified AGI single or $250,000 joint, the 3.8% net investment income tax can apply on top, and most states add their own income tax.
Growth you have not sold is not taxed yet. That is why a low-turnover stock index fund can have little drag despite a high total return: most of its return is price growth, taxed only when you sell, or never if heirs receive a step-up in basis. Inside a traditional or Roth account there is no yearly tax, so no drag while the money stays invested.
How to calculate tax drag
The simplest measure is the gap between an investment’s return before tax and after tax, in percentage points a year. For a holding in a taxable account, estimate it from the payouts: multiply each kind of yearly income, as a share of the holding’s value, by the rate you pay on it, and add the results, as in the formula below.
Funds publish a version for you. Under a rule the SEC adopted in 2001, most mutual funds must show 1-, 5- and 10-year average annual returns three ways in the prospectus: before taxes, after taxes on distributions, and after taxes on distributions and the sale of fund shares. The after-tax figures assume the highest individual federal rates and leave out state and local taxes, so they show the drag for a top-bracket investor; money market funds are exempt. Subtract the return after taxes on distributions from the return before taxes to see a fund’s yearly drag.
In adopting the rule, the SEC called taxes one of the most significant costs of investing in funds through taxable accounts, citing estimates that more than 2.5 percentage points of the average stock fund’s yearly return went to taxes. Those estimates predate today’s lower rates on qualified dividends.
What makes tax drag higher or lower
Two holdings with the same total return can have very different drag. What matters is how much of the return is paid out each year, what kind of income the payout is, and your own rates. Because the rates are yours, the same fund can have almost no drag for a retiree in the 0% capital gains bracket and a large one for a high earner in a high-tax state. The table below puts illustrative numbers on common holdings. The main factors:
- Payout yield: a bond fund paying 5% a year exposes far more of its return to yearly tax than a stock fund yielding 1.5%.
- Income type: interest and nonqualified dividends are taxed at ordinary rates; qualified dividends and long-term gains at 0%, 15% or 20%.
- Turnover: a fund that trades often realizes gains inside the fund and passes them to shareholders; low-turnover index funds usually distribute fewer.
- Your bracket: for 2026, qualified dividends and long-term gains stay at 0% up to $98,900 of taxable income on a joint return, or $49,450 single.
- Account: the same holding has no yearly drag inside an IRA, 401(k) or Roth account.
Tax drag vs. expense ratio
An expense ratio and tax drag are both yearly costs, but they behave differently. The expense ratio is set by the fund, disclosed up front and already deducted from the returns the fund reports. Tax drag depends on your bracket, your state and the account the fund sits in, and it appears in no fund’s headline return.
That makes tax drag easy to underestimate. A bond index fund with a 0.05% expense ratio and a 5% yield, held in a taxable account in the 24% bracket, loses 1.2 percentage points a year to tax: 24 times its fee. A broad stock index fund yielding 1.5% in qualified dividends taxed at 15% has a drag of about 0.23 points, often several times its fee.
So compare funds, or a taxable account with an IRA, on return after fees and after tax. And switching to a cheaper fund can backfire if selling the old one realizes gains that cost more than years of fee savings.
How to reduce tax drag
You cannot remove tax drag from a taxable account entirely, but you can shrink it, usually without changing what you own. The biggest lever is where you hold each investment; the others are which funds you buy, when you sell and how you use losses. None of them is worth an unplanned tax bill today, so weigh the cost of selling before you change anything. Roughly in order of impact:
- Fill tax-advantaged accounts first, so less of your savings sits where income is taxed every year.
- Use asset location: hold bonds and other high-income investments in tax-deferred accounts, and tax-efficient stock index funds in taxable ones.
- In a high bracket, consider municipal bonds for bond money that must stay in a taxable account.
- Prefer low-turnover funds, and hold shares more than one year before selling to get long-term rates.
- Use tax-loss harvesting to offset gains, plus up to $3,000 a year of other income ($1,500 if married filing separately).
- Check a fund’s distribution date before buying late in the year, so you don’t pay tax on a payout that simply returns your own money.
Illustrative numbers
$100,000 in a bond fund yielding 5%, held 20 years, 24% federal bracket
- Pre-tax return
- The holding’s total return before any tax
- After-tax return
- What remains after tax on the year’s payouts and realized gains
- Payout yield
- Interest, dividends or gain distributions paid in the year, as a share of the holding’s value
- Tax rate
- Your rate on that kind of income: ordinary, or 0%, 15% or 20%, plus any state tax and the 3.8% NIIT
Unsold growth is left out: it is taxed only when you sell, and a step-up in basis at death can erase it.
Yearly tax drag: 5% × 24%1.2 percentage points
After-tax growth in a taxable account3.8% a year
Value after 20 years in the taxable account$210,837
Value after 20 years with no tax drag, as in a Roth IRA$265,330
Cost of tax drag$54,493, about 21% of the tax-free result
A drag of 1.2 points a year sounds small, but it compounds: after 20 years the taxable account holds about a fifth less. It owes no further tax at the end, because its interest was taxed each year, and qualified Roth withdrawals are tax-free. State tax would widen the gap. The example assumes interest is reinvested and the same after-tax $100,000 goes into each account.
At a glance
Illustrative yearly tax drag in a taxable account (federal rates, 2026)
| Holding | Taxable payout each year | Rate on that payout | Yearly tax drag |
|---|---|---|---|
| Taxable bond fund, 24% bracket | 5% interest | 24% | 1.20 points |
| Same fund, 32% bracket plus NIIT | 5% interest | 35.8% | 1.79 points |
| Broad stock index fund | 1.5% qualified dividends | 15% | 0.23 points |
| Active stock fund with gain payouts | 1.5% qualified dividends plus 3% long-term gain distributions | 15% | 0.68 points |
| Stock index fund, 0% gains bracket | 1.5% qualified dividends | 0% | None federally |
| Municipal bond fund | 3.5% tax-exempt interest | 0% federal | None federally; states may tax |
| Any holding in a Roth IRA | Nothing taxed while invested | None | None |
Put it in your plan
Tax Drag in MoneyWhatIf
In MoneyWhatIf, price growth and dividends are separate inputs, set for the whole plan or overridden for one account. Brokerage dividends are taxed when received, using the qualified share you select with the rest as ordinary income, and reinvested dividends add to basis. In a taxable account, each bond type sets how its share of interest is taxed. The Taxes page adds rows for interest tax, dividend tax and capital gains tax in any plan that pays them, and an account’s yearly fee reduces its modeled balance.
Common questions
Tax Drag FAQs
Do I pay tax on reinvested dividends?
Yes. Dividends and interest are taxable in the year they are paid to you, even if they automatically buy more shares, and your broker reports them on Form 1099. Reinvested amounts add to your cost basis, so you are not taxed on them a second time when you sell. That yearly tax on reinvested income is the core of tax drag.
Do IRAs and 401(k)s have tax drag?
Not while the money stays invested. Interest, dividends and trades inside a traditional or Roth account create no yearly tax. A traditional account instead taxes every withdrawal as ordinary income, including growth that would have been a lightly taxed long-term gain in a taxable account, while qualified Roth withdrawals are tax-free. That difference is why tax diversification and the account you choose for each holding both matter.
Why did my fund pay a capital gains distribution in a year it lost money?
A fund passes the net gains it realizes to shareholders, usually near year-end. It can realize gains in a down year by selling shares it bought long ago at lower prices, for example to meet redemptions or change holdings. You owe tax on the distribution even if you reinvest it and even though the fund’s price fell. Low-turnover index funds tend to have fewer of these surprises.
Do ETFs have less tax drag than mutual funds?
Often, but only on capital gains. ETFs usually meet redemptions by handing over a basket of securities instead of selling them, so they tend to distribute fewer capital gains than mutual funds holding the same stocks. Their dividends and interest are taxed exactly like a mutual fund’s, so a bond ETF has about the same yearly drag as a bond mutual fund with the same yield.