2026. 10. 14. 09:20ㆍ자산관리
Hello everyone!
Most of the attention in investing goes to the return number. The tax code, though, cares about two things that have nothing to do with how good the investment was: how long you held it, and when you chose to realize the gain. Those two choices can move the final balance by tens of thousands of dollars on the same portfolio and the same return.
Today I want to lay out the actual 2026 United States federal numbers, and then do the arithmetic that shows what deferral is worth. Everything below is education, not a recommendation of any specific product or security.
1. The Two Questions the Tax Code Asks
The first question is the holding period. The IRS rule is simple: an asset held more than one year produces a long-term gain, and an asset held one year or less produces a short-term gain. The count starts the day after you acquire it and includes the day you sell. One day on either side of that line changes which rate schedule applies.
The second question is your taxable income. Long-term gains do not have a single rate; they have three, and which one you land in depends on where your taxable income sits. Here are the 2026 breakpoints as published.
| Filing status | 0% rate up to | 15% rate up to | 20% rate applies above |
|---|---|---|---|
| Married filing jointly | $98,900 | $613,700 | $613,700 |
| Single | $49,450 | $545,500 | $545,500 |
| Head of household | $66,200 | $579,600 | $579,600 |
| Married filing separately | $49,450 | $306,850 | $306,850 |
| Estates and trusts | $3,300 | $16,250 | $16,250 |
Source: IRS Revenue Procedure 2025-32, section 4.03 (Maximum Capital Gains Rate), amounts for taxable years beginning in 2026. Figures are taxable income, not gross income. The shaded row is estates and trusts, shaded because its zero-rate band is about 30 times narrower than a joint filer’s, not because it is a total.
The thing worth noticing is how wide the zero-rate band actually is. A married couple filing jointly pays nothing on long-term gains until taxable income passes $98,900. Taxable income is what is left after the standard deduction, which for 2026 is $32,200 for joint filers, so a couple with no other income could in principle run roughly $131,100 of gross income through that band before a dollar of federal capital gains tax appears. For a single filer the equivalent arithmetic is $49,450 plus $16,100, or $65,550.
The shaded row is the exception that surprises people. Estates and trusts reach the 20% rate at $16,250 of taxable income, a threshold about 30 times lower than a joint filer’s. Money held inside a trust is simply playing a different game.
2. Short-Term and Long-Term Are Not a Small Difference
A short-term gain is taxed as ordinary income at the graduated rates. That means the gap between the two treatments is not one fixed number; it widens and narrows depending on which bracket you are standing in. Laying the two published 2026 schedules side by side for a single filer gives this.
| Taxable income band (single filer) | Short-term rate | Long-term rate | Difference |
|---|---|---|---|
| $0 – $12,400 | 10% | 0% | 10 points |
| $12,400 – $49,450 | 12% | 0% | 12 points |
| $49,450 – $50,400 | 12% | 15% | minus 3 points |
| $50,400 – $105,700 | 22% | 15% | 7 points |
| $105,700 – $201,775 | 24% | 15% | 9 points |
| $201,775 – $256,225 | 32% | 15% | 17 points |
| $256,225 – $545,500 | 35% | 15% | 20 points |
| $545,500 – $640,600 | 35% | 20% | 15 points |
| Above $640,600 | 37% | 20% | 17 points |
Source: IRS Revenue Procedure 2025-32, sections 4.01 (Tax Rate Tables) and 4.03, single filers, tax year 2026. The difference column is simple subtraction of the two published rates, not an estimate. The shaded row is the one band where the long-term rate sits above the ordinary rate, not a total.
The widest gap is 20 percentage points, in the band from $256,225 to $545,500, where ordinary income is taxed at 35% and a long-term gain at 15%. The narrowest positive gap is 7 points. And there is exactly one band, highlighted above, where the ordering flips: between $49,450 and $50,400 the ordinary rate is 12% while the long-term rate has already stepped up to 15%. That band is only $950 wide, so it is a curiosity rather than a planning problem, but it is a useful reminder that the two schedules were written independently and their edges do not line up.
One more layer sits on top. The Net Investment Income Tax adds 3.8% on the lesser of net investment income or the amount by which modified adjusted gross income exceeds $200,000 for single filers and $250,000 for joint filers. Interest, dividends, capital gains, rents and royalties all count toward it; wages and Social Security benefits do not. That is where the 23.8% figure in the next section comes from: 20% plus 3.8%.
3. The Same Portfolio Under Six Tax Treatments
Now the arithmetic. Take $10,000, assume a 7% annual return and a 30-year horizon, and change nothing except how the gain is taxed. In the deferred cases the money compounds untouched and one tax is paid on the whole gain at the end: 10,000 times 1.07 to the thirtieth, then tax on the gain. In the yearly cases the entire gain is realized and taxed each year, so the compounding rate itself drops to 7% times one minus the rate.
| No tax at all | $76,123 | |
| Deferred, 15% at the end | $66,204 | |
| Deferred, 23.8% at the end | $60,385 | |
| Taxed every year at 15% | $56,628 | |
| Taxed every year at 23.8% | $47,540 | |
| Taxed every year at 37% | $36,497 |
Assumes $10,000 invested once, a 7% annual return and a 30-year horizon, with no dividends and no state tax. Deferred cases: 10,000 x 1.07^30, then one tax on the gain. Yearly cases: 10,000 x (1 + 0.07 x (1 - rate))^30, which assumes the entire gain is realized and taxed every single year. Bars start at zero, so the visible gap is the real gap.
Untaxed, the $10,000 becomes $76,123. Deferring the whole way and paying 15% once at the end leaves $66,204. Paying that same 15% every year instead leaves $56,628. The rate is identical in both cases. The timing alone costs $9,576, which is 14.5% of the entire pre-tax gain.
The reason is that a yearly tax does not just take a slice; it lowers the growth rate that everything afterwards compounds on. At 7% the money multiplies by 7.61 over 30 years. At 7% minus a 15% annual bite, the effective rate is 5.95% and the multiple falls to 5.66. That difference then compounds against itself for three decades.
At the harshest end, a position turned over inside a year and taxed at the top 37% ordinary rate every year ends at $36,497, which is 47.9% of the untaxed outcome. Same return, less than half the money.
4. The Gap Grows Slowly, Then Suddenly
What makes this easy to underestimate is that the penalty is almost invisible early on. Holding the rate at 15% and varying only the horizon, here is the difference between paying once at the end and paying every year.
| 5 years | $71 | |
| 10 years | $397 | |
| 15 years | $1,155 | |
| 20 years | $2,622 | |
| 25 years | $5,218 | |
| 30 years | $9,576 | |
| 35 years | $16,649 | |
| 40 years | $27,849 |
Assumes the same $10,000 and the same 7% return, and shows the deferred-at-15% balance minus the taxed-every-year-at-15% balance at each horizon. Bar widths are each gap divided by the 40-year gap. Bars start at zero, so the visible gap is the real gap.
At five years the gap is $71, which rounds to nothing anyone would notice on a statement. At ten years it is $397. At twenty it is $2,622. At forty it is $27,849, which is more than the original $10,000 nearly three times over.
Stretching the horizon from 10 years to 40 years multiplies the elapsed time by four. It multiplies the cost of the tax timing by about 70. That is the asymmetry worth remembering: the decision that looks trivial in year three is the one doing almost all the damage by year thirty-five.
5. What These Numbers Do Not Say
The yearly-tax column is deliberately an extreme. It assumes 100% turnover every single year, which describes active trading rather than a long-held fund. A broad index fund realizes very little internally, so a real taxable account usually sits somewhere between the two bars rather than on one of them. The honest reading of the chart is a range, not a forecast.
Several real things are also left out. State and local taxes are not modeled, and they vary enormously. Dividends are not modeled, though qualified dividends use the same three-tier schedule shown in the first table. Realized losses, which can offset gains, are not modeled either. Tax-advantaged retirement accounts work on completely different rules and are not what any line above describes.
And the 7% return is an assumption chosen to make the arithmetic legible, not a prediction. Every figure in the two charts is arithmetic on that assumption plus the published rates, and if you change the return the dollar amounts change with it. What does not change is the direction: at any positive return, paying later beats paying the same rate earlier.
Final Thoughts
Two numbers from today are worth keeping. The first is that the long-term and short-term schedules can differ by as much as 20 percentage points on the same dollar of gain, decided by a holding period that is measured in days. The second is that at an identical 15% rate, timing alone accounted for $9,576 of a $66,123 gain over 30 years.
Neither of those is an argument for holding something you no longer want. Taxes are one input among several, and a position kept purely to avoid a tax bill has its own cost. What the arithmetic does say is that the tax treatment of a plan deserves to be looked at before the plan starts, not after, because the gap is set by decisions made early and only becomes visible decades later.
All figures here are United States federal rules for tax year 2026 and are general information, not tax or investment advice. Rules change, individual circumstances differ, and any investment decision and its outcome are ultimately your own responsibility.
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