Progressive Tax System Examples: Brackets, Capital Gains, AMT

Progressive tax system examples all share one mechanic: as income rises, it crosses into higher rate bands, and only the dollars inside each band get taxed at that band’s rate. The clearest example is the federal income tax, which for 2026 runs through seven brackets from 10% up to 37%.¹ But the federal income tax is only one of several progressive schedules in U.S. tax law. Long-term capital gains, the estate and gift tax, and the Alternative Minimum Tax each use their own graduated rates, and the worked numbers below show how each one behaves.

How Brackets Stack: Marginal vs. Effective

A tax bracket is a range of income taxed at one rate. When income crosses into the next range, only the dollars above that threshold pay the higher rate. Everything below stays where it was.

Your marginal rate is the percentage on your last dollar earned. Your effective rate is your total tax divided by your total taxable income. In a progressive system the effective rate is always lower than the marginal rate, because the earlier dollars were taxed in the lower bands. Someone whose top marginal rate is 32% often pays an effective rate closer to 20% once every band is added up.

People hear “I’m in the 22% bracket” and assume 22% applies to their whole income. It doesn’t. That misreading is the single most common mistake about how these systems work.

Federal Income Tax: A Worked Example

The 2026 brackets for a single filer are:

10% on taxable income up to $12,400
12% on $12,401 to $50,400
22% on $50,401 to $105,700
24% on $105,701 to $201,775
32% on $201,776 to $256,225
35% on $256,226 to $640,600
37% on anything above $640,600

Married couples filing jointly get wider bands: the 10% bracket runs to $24,800, the 12% bracket to $100,800, and the 37% rate doesn’t start until income exceeds $768,700.¹

Take a single filer with $100,000 of taxable income. The tax builds in layers:

10% on the first $12,400 = $1,240
12% on the next $38,000 (from $12,401 to $50,400) = $4,560
22% on the remaining $49,600 (from $50,401 to $100,000) = $10,912

Total federal income tax: $16,712. The top marginal rate is 22%, but $16,712 divided by $100,000 works out to an effective rate of about 16.7%. The gap between the two rates is the progressive structure at work.¹

One point on the base: the brackets apply to taxable income, not gross income. The standard deduction ($16,100 single, $32,200 joint for 2026) comes off first, which effectively creates a 0% band at the bottom before the 10% rate touches anything.¹

Long-Term Capital Gains

Profit from selling assets held more than a year runs through its own progressive schedule with three rates: 0%, 15%, and 20%. For 2026, a single filer pays 0% on long-term gains that sit within the first $49,450 of taxable income, 15% on gains in the range above that, and 20% once taxable income passes $545,500. Joint filers hit 15% above $98,900 and 20% above $613,700.²

A 3.8% Net Investment Income Tax adds a further layer at the top, applying to the smaller of net investment income or the amount by which modified AGI exceeds $200,000 (single) or $250,000 (joint).³ With that surtax stacked on, the top rate on long-term gains reaches 23.8%, but only on the income above those thresholds.

Estate and Gift Tax

The federal estate tax uses a graduated schedule starting at 18% on the first $10,000 above the exclusion and climbing through roughly a dozen brackets to a top rate of 40% on amounts more than $1 million above the exclusion.⁴ Most estates never reach any of these rates. For 2026, the basic exclusion is $15 million per individual, made permanent by the One, Big, Beautiful Bill signed in July 2025; a married couple can shelter up to $30 million combined.⁵

The gift tax uses the same rate schedule and the same lifetime exclusion. Only after the $15 million lifetime amount is fully used do the graduated rates start applying.⁶

The Alternative Minimum Tax

The AMT is a parallel calculation with its own two-rate progressive schedule: 26% on the first portion of alternative minimum taxable income above the exemption, and 28% on the rest. For 2026, the AMT exemption is $90,100 for single filers and $140,200 for joint filers. The exemption itself phases out as income climbs, starting at $500,000 (single) and $1,000,000 (joint), which quietly adds a third layer of progressivity by stripping the exemption from higher earners.¹

Progressive vs. Flat vs. Regressive

Flat (Proportional) Tax

A flat tax charges one rate on every dollar. At 5%, an earner making $40,000 pays $2,000 and one making $400,000 pays $20,000. Marginal and effective rates are identical at every income level. Several states use this structure for their income taxes.

Regressive Tax

A regressive tax takes a larger share of income from lower earners. Sales taxes are the standard example: a household that spends most of its paycheck loses a bigger percentage to sales tax than a wealthy household that saves most of its income.

The Social Security payroll tax fits here too. The 6.2% employee rate applies only up to a wage cap of $184,500 in 2026, with every dollar above the cap exempt.⁷ A worker earning exactly $184,500 pays $11,439, an effective rate of 6.2%. A worker earning $500,000 also pays $11,439, an effective rate of about 2.3%. The higher the income, the lower the effective rate.

State Income Taxes

Many states layer their own progressive schedules on top of the federal one. About 27 states and the District of Columbia use graduated brackets, with top marginal rates ranging from under 3% to over 13%. Nine states impose no individual income tax at all. The remaining income-tax states use a flat rate.

Where you live changes the shape of the picture. A high earner in a state with steep graduated brackets can face a combined federal-and-state marginal rate above 50%, while an identical earner in a no-income-tax state stops at the federal number. Two people with the same salary can end up with very different after-tax income for that reason alone.

1
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
2
Internal Revenue Service. Topic No. 409, Capital Gains and Losses
3
Internal Revenue Service. Topic No. 559, Net Investment Income Tax
4
Office of the Law Revision Counsel. 26 USC 2001 – Imposition and Rate of Tax
5
Internal Revenue Service. What’s New — Estate and Gift Tax
6
Internal Revenue Service. Estate Tax
7
Social Security Administration. Contribution and Benefit Base