Blended Tax Rate for an LLC or S-Corp: Business Income Explained

Business income is where blended tax rates get genuinely useful, because a single dollar of profit can pass through several different taxes before it reaches you. Owners who only look at their income tax bracket routinely underestimate what they owe by ten points or more.

For a pass-through business like an LLC or S-corp, your blended tax rate is total tax — federal income tax, state income tax, and self-employment or payroll tax combined — divided by your total business income. It answers the real question: out of every dollar my business earned, how much did I keep?

Run the income-tax portion here, then layer on the business-specific taxes below:

The Layers of Tax on Business Income

Unlike a W-2 employee, a business owner often stacks several taxes on the same profit:

The blended rate folds all of these into one percentage so you can compare an LLC against an S-corp election, or one state against another, on equal footing.

LLC (Default / Sole Proprietor) Example

Say a single-member LLC nets $120,000 in a no-income-tax state. Self-employment tax applies to 92.35% of net earnings:

• Self-employment tax: $120,000 × 0.9235 × 15.3% ≈ $16,955 (half is deductible).
• Federal income tax on roughly $111,500 of taxable income (after the SE-tax deduction and standard deduction) ≈ $17,000.
• Total tax: ≈ $33,955.

Blended rate = $33,955 ÷ $120,000 ≈ 28.3% — well above the ~17% a W-2 earner would see on the same income tax alone, entirely because of self-employment tax.

S-Corp Example (Same $120,000)

Pay yourself a $70,000 reasonable salary and take $50,000 as a distribution:

• Payroll tax on the $70,000 salary only: ≈ $10,710.
• Federal income tax on ~$120,000 of pass-through income: ≈ $17,000.
• Total tax: ≈ $27,710.

Blended rate = $27,710 ÷ $120,000 ≈ 23.1% — over five points lower than the LLC, saving roughly $6,200, before accounting for payroll and filing costs.

Add State Tax on Top

If your business operates in a state with income tax, add that liability before dividing. The method is identical to a personal blended federal and state tax rate — sum every tax, divide by total income.

This Is Modeling, Not Tax Advice

Entity elections, reasonable-salary rules, and the qualified business income (QBI) deduction have real complexity and IRS scrutiny. Use these figures to understand the shape of the decision, then confirm specifics with a CPA or EA. The IRS outlines the S-corporation rules and reasonable-compensation expectations directly.

Frequently Asked Questions

What is the blended tax rate for an LLC?

An LLC's blended tax rate is its total tax — federal income tax, state income tax, and self-employment tax — divided by total business income. Because self-employment tax adds 15.3% on top of income tax, a default LLC's blended rate is typically higher than a W-2 employee's effective rate on the same income.

How does an S-corp lower the blended tax rate?

An S-corp lets you split profit into a reasonable salary (subject to 15.3% payroll tax) and distributions (not subject to that tax). Because only the salary faces payroll tax, the overall blended rate drops once profits are high enough to justify the added payroll and filing costs.

Does the blended tax rate include self-employment tax?

For a business, yes — a meaningful blended rate on self-employment income should include self-employment or payroll tax alongside federal and state income tax. Standard personal blended (effective) tax rates cover income tax only, so business owners must add the FICA-equivalent layer to see their true burden.

What about the QBI deduction?

The 20% qualified business income deduction can reduce the taxable income figure used in your federal calculation, lowering the income-tax portion of your blended rate. It does not reduce self-employment tax. Because eligibility and limits are income-dependent, confirm your QBI treatment with a tax professional.