Estimate your business profit and simplified federal tax for 2024, 2025, or 2026. Includes self-employment tax for pass-through entities and 21% flat rate for C Corporations.
Enter your business income and expense information
to see your estimated business profit and tax.
A business tax calculator is a tool that helps small business owners, freelancers, and self-employed individuals estimate their potential federal tax liability. By entering your annual revenue, cost of goods sold, business expenses, and entity type, you can get a simplified estimate of your business profit and the federal taxes that may apply.
This calculator supports 2024, 2025, and 2026 tax years using year-specific federal tax brackets and standard deductions. It includes self-employment tax for pass-through entities and the flat 21% corporate rate for C Corporations.
Understanding your estimated business taxes is important for financial planning, cash flow management, and quarterly estimated tax payments. This tool is designed for US small business owners who need a quick, educational estimate—not a replacement for professional tax preparation.
The basic calculation follows this order:
Revenue − Cost of Goods Sold = Gross Profit
Gross Profit − Operating Expenses − Other Expenses = Business Profit
Business Profit (+ Other Income − Deductions) × Applicable Tax Rate = Estimated Tax
The tax rate depends on your business structure:
For pass-through entities, there are two separate federal taxes to consider:
This calculator estimates both for sole proprietors, single-member LLCs, and partners. For S Corp shareholders, only the W-2 wage portion is subject to payroll taxes; this calculator does not separately model payroll tax withholding.
Sole Proprietorship & Single-Member LLC: The IRS treats a single-member LLC as a disregarded entity by default. Business income and expenses are reported on Schedule C, and net profit is subject to income tax and self-employment tax. Owner draws are not deductible wages—they are distributions of profit.
Partnership: The partnership files Form 1065 but pays no entity-level tax. Partners report their distributive share on Schedule E and may owe self-employment tax on active trade or business income.
S Corporation: Shareholders who work in the business must receive reasonable W-2 wages, which are deductible by the corporation and subject to payroll taxes. Remaining pass-through income is not subject to self-employment tax. This calculator deducts owner W-2 salary only for S Corps.
C Corporation: The corporation pays a flat 21% federal tax on taxable income. Shareholder-employees receive W-2 wages (deductible). Dividends are taxed again at the shareholder level (not modeled).
Hypothetical: Sole Proprietor, Tax Year 2026, Single Filer
| Annual Revenue | $200,000 |
| Cost of Goods Sold | $50,000 |
| Operating Expenses | $40,000 |
| Other Deductible Expenses | $10,000 |
| Other Personal Income | $0 |
| Business Profit | $100,000 |
Estimated SE Tax: $100,000 × 0.9235 = $92,350 × 15.3% = $14,130 (approximately; Social Security cap not reached at this income)
Half SE Deduction: $7,065
Standard Deduction (2026 Single): $16,100
QBI Deduction (simplified): 20% of $100,000 = $20,000 (subject to taxable income limit)
Taxable Income (after QBI): Approximately $56,835. Income tax at 2026 single brackets: approximately $6,499. Total estimated federal tax: approximately $20,629.
This is an illustrative example only. Actual results depend on many factors not captured here.
If you expect to owe $1,000 or more in federal tax when you file, the IRS requires estimated quarterly payments using Form 1040-ES. For self-employed individuals and pass-through entity owners, this is a critical cash flow consideration.
Generally, you must pay estimated tax if you expect to owe at least $1,000 after subtracting withholding and credits, and your withholding covers less than 90% of this year's tax or 100% of last year's tax (110% if AGI exceeds $150,000).
Quarterly due dates are typically April 15, June 15, September 15, and January 15 of the following year. This calculator can help you estimate the annual amount to divide across those payments, but consult IRS Publication 505 or a tax professional for precise calculation.
A business tax calculator is a tool that estimates federal business taxes based on revenue, expenses, business structure, and tax year. This calculator provides a simplified estimate and does not replace professional tax preparation.
Business profit = Revenue − Cost of Goods Sold − Operating Expenses − Other Deductible Expenses. For S Corporations, reasonable owner W-2 wages are also deductible before calculating pass-through profit.
No. Revenue is total income before any deductions. Taxable income is what remains after subtracting business expenses, self-employment tax deductions, standard deductions, and QBI deductions (for pass-through entities).
By default, a single-member LLC is a disregarded entity for federal income tax purposes. It is treated as a sole proprietorship: income and expenses go on Schedule C, and net profit is subject to income tax and self-employment tax.
Yes. For sole proprietors, single-member LLCs, and partners, the calculator includes self-employment tax at 15.3% on 92.35% of net earnings, with the Social Security wage base cap applied. S Corp wages are not separately modeled for payroll tax purposes.
The Qualified Business Income (QBI) deduction under Section 199A allows eligible pass-through entity owners to deduct up to 20% of qualified business income. This calculator applies a simplified version below the threshold and does not model complex limitations for higher-income taxpayers.
Yes. If expenses exceed revenue, the business has a loss. For pass-through entities, the loss may be limited by basis rules and at-risk rules. Net operating loss carryforward rules apply. This calculator shows the loss but does not model NOL carryforward.
No. This is a simplified educational estimate. Actual tax liability depends on many factors not captured here, including credits, depreciation, state taxes, and complex entity elections. Always consult a qualified tax professional.
This calculator was built using published IRS tax brackets, standard deduction figures, and self-employment tax rules. It is maintained by the SmartTaxCalculator team. We are not tax professionals and do not provide personalized tax advice.
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