How Taxes Shrink Investment Returns

Two people can own the same stocks, earn the same return before tax, and end up with very different amounts, because one of them loses a slice of the return to tax every year and the other does not. That yearly slice is called tax drag. It never shows up as a line on a statement, which is why most investors underestimate it. This chapter explains where investment taxes come from, how large the drag can grow over decades, and the three levers that shrink it: holding period, the kind of income an investment pays, and the account it sits in. The rest of this book builds on these ideas.

The four ways an investment gets taxed

An investment in an ordinary brokerage account can create a tax bill in four ways, and they are not taxed alike.

Short-term capital gains. Sell something you have held for one year or less at a profit, and the gain is taxed as ordinary income, at the same rates as your wages.

Long-term capital gains. Hold for more than one year before selling, and the gain gets its own lower rates: 0%, 15% or 20%, depending on your taxable income. For 2026 a single filer pays 0% on long-term gains while taxable income stays at or below $49,450 ($98,900 for a married couple filing jointly), and the 20% rate starts above $545,500 ($613,700 jointly). Gains are stacked on top of your other income, so your wages decide how much of a gain lands in each band.

Dividends and interest. Qualified dividends, which most dividends from US companies and many foreign ones are if you meet a short holding-period test, are taxed at the long-term capital gains rates. Interest from bonds, savings and most bond funds, and the non-qualified dividends paid by most real estate investment trusts, are taxed as ordinary income.

Fund distributions. A mutual fund that sells holdings at a gain must pass those gains to its shareholders, usually in December. You owe tax on that distribution even if you reinvested it and never sold a share.

On top of all four, a 3.8% net investment income tax applies to the investment income of people whose modified adjusted gross income is above $200,000 for a single filer or $250,000 for a married couple filing jointly. Those thresholds are set in the law and are not raised for inflation, so more households cross them each year. Most states also tax investment income, usually at the same rate as wages.

Why holding period is the cheapest lever

The gap between short-term and long-term treatment is often the largest single tax difference an investor controls, and it costs nothing but patience.

On wages alone, this filer owes $13,170 of federal income tax. A short-term gain that lifts income to $110,000 raises the bill to $15,370, because the whole gain is taxed at the filer's top bracket of 22.0%. Had the same shares been held a little longer, the gain would have been long-term and taxed at 15% instead, since this filer's taxable income sits between the 0% and 20% bands. The difference between 22% and 15% on every dollar of gain is the price of selling a few weeks too early.

Holding longer is not always right. A position you have good reason to sell should not be kept only for a tax reason, because a falling price can cost more than the tax saved. But when the sale is discretionary and the one-year mark is close, checking the purchase date before selling is one of the simplest habits in investing.

How small yearly drag becomes a large number

A drag of one percentage point a year sounds trivial. Compounded over decades, it is not. The example below treats the tax lost each year as a yearly cost, the same way the investment fee calculator treats a fund's expense ratio.

Starting with $100,000, adding $500 a month for 25 years at 7.0% before tax, a portfolio that loses 0.4% a year to tax ends near $863,339. One that loses 1.2% a year ends near $737,879. The difference, $125,460, is money the investor never sees taken.

Which drag figure fits you depends on what you own. A broad stock index fund that pays a modest dividend and rarely distributes gains loses little each year. An actively traded fund that turns over much of its portfolio, or a bond fund whose interest is taxed as ordinary income, can lose far more. Morningstar publishes a "tax cost ratio" for many funds that estimates this drag from their history; it is worth looking up before buying a fund for a taxable account. The investment fee calculator lets you try your own figures.

Municipal bonds: tax-free is not the same as better

Interest on most municipal bonds, issued by states, cities and their agencies, is exempt from federal income tax, and bonds issued in your own state are usually exempt from your state's tax too. That sounds like an easy win, but munis pay lower yields precisely because of the exemption, so the question is whether the tax you save is worth more than the yield you give up.

The standard comparison is the tax-equivalent yield: the taxable yield that would leave you with the same after-tax income.

Tax-equivalent yield = municipal yield ÷ (1 − your marginal tax rate)

This filer's next dollar is taxed at 24.0%. For them, a muni yielding 3.5% is worth the same as a taxable bond yielding about 3.5% ÷ 0.76, or roughly 4.6%. If a comparable taxable bond pays more than that, the taxable bond comes out ahead even after tax; if it pays less, the muni wins. In a 12% bracket the same muni is worth only about 4.0% taxable, so munis tend to make sense for higher earners and rarely for people in the lowest brackets. Add your state rate to the marginal rate when the bond is from your own state.

Three cautions. Muni interest still counts in the formula that decides how much of your Social Security is taxed, and in the income used for Affordable Care Act subsidies. Some munis, called private activity bonds, can be subject to the alternative minimum tax. And munis never belong in an IRA or 401(k): those accounts already shelter interest, so you would accept a lower yield for a tax break you cannot use.

Where the money sits matters as much as what it is

The three main levers to cut tax drag are:

• Hold for the long term where you can, so gains are taxed at the lower rates, and so tax is deferred until you sell.
• Prefer tax-efficient investments in taxable accounts: broad index funds and exchange-traded funds that distribute few gains, and, for higher earners, municipal bonds in place of taxable bonds.
• Place each investment in the account that taxes it least. Retirement accounts shelter interest and turnover from yearly tax, so they are the natural home for the least tax-efficient holdings. That idea, called asset location, is the subject of chapter 3.

A fourth lever, using losses to offset gains, is covered in chapter 4.