2025 Tax Brackets for Business Owners: Marginal vs. Effective Rate and Why the Bracket Matters Less Than You Think

By Yarik Yarosh, CPA ·September 5, 2026 ·3 min read

Written by Yarik Yarosh, CPA (US & Canada) September 5, 2026 · FL CPA license AC61704 · CPA Ontario

The most common tax misconception among business owners: “If I earn one more dollar and move into the next bracket, all my income gets taxed at the higher rate.” This is wrong. The U.S. uses a progressive (marginal) system: only the income in each bracket is taxed at that bracket’s rate. Moving from the 22% bracket to the 24% bracket means only the dollars above the 22% threshold are taxed at 24%. All income below that threshold stays at 22% (and the income below that at 12%, and so on).

✓Key takeaway

2025 federal income tax brackets (married filing jointly):

Taxable Income	Rate
$0 - $23,850	10%
$23,851 - $96,950	12%
$96,951 - $206,700	22%
$206,701 - $394,600	24%
$394,601 - $501,050	32%
$501,051 - $751,600	35%
$751,601+	37%

2025 federal income tax brackets (single):

Taxable Income	Rate
$0 - $11,925	10%
$11,926 - $48,475	12%
$48,476 - $103,350	22%
$103,351 - $197,300	24%
$197,301 - $250,525	32%
$250,526 - $626,350	35%
$626,351+	37%

What business owners actually pay (effective rate): The effective tax rate includes income tax, self-employment tax, and state income tax, reduced by the QBI deduction, SE tax deduction, and other above-the-line deductions. The effective rate is almost always lower than the marginal rate.

What is the real effective tax rate for a business owner?

Hypothetical example

Round numbers. A sole proprietor earns $120,000 in net Schedule C profit. Single filer, no other income, standard deduction.

Step 1: Self-employment tax

SE tax base: $120,000 x 92.35% = $110,820
SE tax: $110,820 x 15.3% = $16,955
Deductible half of SE tax: $8,478

Step 2: QBI deduction

QBI: $120,000 - $8,478 = $111,522 (adjusted for SE deduction)
QBI deduction: $111,522 x 20% = $22,304

Step 3: Taxable income

Gross income: $120,000
Minus half SE tax: -$8,478
Minus standard deduction: -$15,700
Minus QBI deduction: -$22,304
Taxable income: $73,518

Step 4: Federal income tax

10% on $11,925: $1,193
12% on $36,550 ($48,475 - $11,925): $4,386
22% on $25,043 ($73,518 - $48,475): $5,509
Total income tax: $11,088

Step 5: Total federal tax

Income tax: $11,088
SE tax: $16,955
Total: $28,043

Effective federal rate: $28,043 / $120,000 = 23.4%

The business owner is in the 22% marginal income tax bracket, but the effective rate is 23.4% when SE tax is included (or 9.2% income tax alone). The SE tax adds more than the income tax for many small business owners.

Illustrative numbers only, not a real client and not advice for your facts.

Why “staying in a lower bracket” is usually a bad idea

Business owners sometimes avoid profitable decisions (taking on more clients, raising prices) because they fear “moving into a higher bracket.” This fear is misplaced because:

The marginal rate increase is small (2 percentage points from 22% to 24%, for example)
Only the incremental dollars are taxed at the higher rate
Earning $10,000 more and paying $2,400 in additional tax still leaves $7,600 in additional after-tax income

The QBI deduction also softens the bracket impact: 20% of qualified business income is deducted before calculating income tax, so the effective marginal rate on the next dollar is approximately 17.6% (22% x (1 - 20%)) for a business owner in the 22% bracket.

Related guides:

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Cite this page

Yarik Yarosh, CPA. "2025 Tax Brackets for Business Owners: Marginal vs. Effective Rate and Why the Bracket Matters Less Than You Think." Blue Cloud CPA, September 5, 2026. https://bluecloudcpa.com/guides/small-business-tax-brackets-2025-effective-rate

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.