Figures last verified against primary sources on . See methodology and corrections.
Marginal or Effective: the Two Tax Rates of a $65,000 Earner
A single filer earning $65,000 in 2026 has two federal tax rates: 12% on the next dollar earned, and 8.6% on all of it. The first is the marginal rate and the second is the effective rate, and each answers a different question.
The two rates for one filer
After the $16,100 standard deduction, this filer has $48,900 of taxable income. The 2026 single schedule in Rev. Proc. 2025-32 taxes the first $12,400 at 10% and the rest, up to $50,400, at 12%, for $5,620 of federal income tax.
| Rate | How it is figured | This filer |
|---|---|---|
| Marginal | The rate on the band the last dollar of taxable income falls in | 12% |
| Effective | Total income tax divided by total income | $5,620 ÷ $65,000 = 8.6% |
The effective rate is lower because the standard deduction is taxed at nothing and the first $12,400 of taxable income at 10%. Both pull the average below the rate on the top band.
Which rate answers which question
A raise. Use the marginal rate. A $1,000 raise moves taxable income to $49,900, still inside the 12% band, so federal tax rises by $120. Using the 8.6% effective rate would say $86 and understate the cost.
A deduction. Use the marginal rate too, since a deduction removes the top dollars of taxable income. A $1,000 deduction saves this filer $120 of federal tax. A credit is different: it comes off the tax itself, so a $1,000 credit is worth $1,000 at any rate.
Comparing states, or two years. Use the effective rate or, better, the dollars. The marginal rate says nothing about how much of the income a state takes in total.
Two states, two shapes
Illinois taxes every dollar of net income at 4.95% (Illinois DOR). After the $2,925 exemption, this filer owes $3,073, an effective rate of 4.73%, and a $1,000 raise adds $50. With one rate, the marginal and effective figures sit close together, and only the exemption separates them.
North Dakota starts from federal taxable income (N.D. Cent. Code ch. 57-38) and taxes the first $49,575 of it at 0.00% for a single filer in 2026 (Form ND-1ES). This filer's $48,900 sits entirely inside that band, so North Dakota tax is $0 and the effective rate is 0.00%. A $1,000 raise pushes $325 past the line into the 1.95% band and adds $6.
| On a $1,000 raise | Federal | State | Together |
|---|---|---|---|
| Illinois | $120 | $50 | 12% plus 4.95% |
| North Dakota | $120 | $6 | 12% plus a fraction of 1.95% |
The marginal rates of the two states differ by about five points on that raise, and their totals differ by $3,073 a year. The second number is the one that compares the states. The first is the one that prices the raise.
Sources
Ordered by authority — the law and the agencies administering it first. Every link is checked for rot; see all sources.
- Primary lawN.D. Cent. Code ch. 57-38 — income taxNorth Dakota Legislative Branch · checked 2026-10-20Section 57-38-30.3(2)(d) reduces the individual tax base by 40% of the excess of net long-term capital gain over net short-term capital loss (to the extent allocated to North Dakota) and by 40% of qualified dividends. Section 57-38-30.3(1)(g) has the tax commissioner raise every bracket’s dollar bounds each year by the federal cost-of-living adjustment under IRC §1(f), rates unchanged.Other articles citing this source
- GovernmentIncome tax ratesIllinois Department of Revenue · checked 2026-09-01The current individual rate (4.95%, effective July 1, 2017) and the corporate 7% plus the 2.5%/1.5% personal property replacement tax.Other articles citing this source
- GovernmentRevenue Procedure 2025-32 — tax year 2026 inflation adjustmentsInternal Revenue Service · checked 2026-10-20The revenue procedure itself: the §1(j)(2) rate tables with their formula rows, the capital-gains thresholds, the child tax credit amount, the §4.14 standard-deduction rows and §63(f) aged/blind additional amounts, and the §2 background listing which OBBBA sections changed each figure.Other articles citing this source
- GovernmentForm ND-1ES (SFN 28709) — 2026 estimated income tax, individualsNorth Dakota Office of State Tax Commissioner · checked 2026-09-01The 2026 tax rate schedule. For a single filer, North Dakota taxable income from $0 to $49,575 is taxed at 0.00%, then 1.95% to $250,400 and 2.50% above it — the state's 0% band, widened from 2025.Other articles citing this source