Updated for 2026 Tax Law

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Every tax calculator, entity comparison, and optimization tool you need, in one place. Powered by AI that knows 2026 tax law cold.

Entity Structure Comparison

$150,000 Net Income

2026 tax rates · Single filer · California

Sole Prop / LLC

Default
$47,832
Total Tax Burden

S-Corporation

Recommended
$39,145
Total Tax Burden
Save $8,687/yr

C-Corporation

Growth Play
$41,520
Total Tax Burden
Free Tools

Six calculators. Zero cost.

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Entity Structure Comparison

LLC vs S-Corp vs C-Corp. See the real tax impact for your income, state, and filing status.

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Quarterly Tax Estimator

Never miss a quarterly payment. Auto-calculates estimated taxes based on your YTD income.

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Home Office Deduction

Simplified vs actual method, side by side. Know which saves more before you file.

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Self-Employment Tax

SE tax, income tax, QBI deduction. See your full 1099 tax picture in seconds.

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State Tax Comparison

Compare effective tax rates across all 50 states. Know where your money goes furthest.

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Tax Bracket Calculator

2026 brackets with OBBBA changes. See marginal vs effective rates instantly.

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Premium Intelligence

When free isn't enough.

Deep analysis for business owners who want to optimize, not just estimate. AI-powered reports that would cost $2,000+ from a CPA.

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Full Tax Optimization Report Personalized strategy across all deductions, credits, and entity options
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Entity Restructuring Analysis Should you switch from LLC to S-Corp? Get the exact numbers
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Multi-State Tax Strategy Operating in multiple states? Optimize your nexus and filing obligations
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Year-End Tax Planning Proactive moves to minimize your tax bill before December 31
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Real Estate Investor Playbook Depreciation, 1031 exchanges, cost segregation, passive loss rules
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R&D Tax Credit Estimator 100% expensing is back. Calculate your credit under the new rules

Your taxes shouldn't cost more than they have to.

TaxStackHub is building the tax intelligence platform that every small business owner deserves. Smart tools. Real savings. No CPA required.