Small Business Tax Estimator
Estimate annual federal tax for a sole-proprietor style business and compute quarterly payment targets.
Configure your scenario
Enter business revenue, expenses, and prior-year tax for quarterly planning.
$120,000
$32,660
$5,500
Detailed estimate
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Step back from one calculator and browse the full federal, payroll, property, and state map.
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US tax home
Return to the main US hub for guided paths across paycheck, self-employed, and homeownership tools.
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Pakistan calculators
Need FBR, withholding, or Pakistan filing tools? Jump to the Pakistan-side calculator system.
Small business tax - quick answers
Why does this compare 90% vs prior-year tax?+
IRS estimated-tax safe-harbor rules generally allow penalty protection based on either current-year or prior-year payment thresholds.
Is this for corporations too?+
This version models sole-proprietor/Schedule C style flow. Use dedicated entity calculators for S-corp scenarios.
Official references
Sources & Act Reference
Small-business estimator references
Publication 334
Schedule C reporting framework for sole proprietors and statutory employees.
Publication 505
Estimated-tax safe-harbor thresholds and payment planning guidance.
Rule Trace
Applied rule and official references
Applied rule: annual estimate = income tax + SE tax; quarterly planning compares IRS safe-harbor thresholds
Official quick links
Compliance checklist
Validate allowable expenses, depreciation, credits, and any entity elections before filing/payment decisions.
Smart Insight
Estimated quarterly federal-payment target is $5,500.
Keep your US tax path moving
1099 tax calculator
Start with mixed contractor income before jumping into structure choices.
Self-employment tax
Break out the SE tax layer before quarterly planning.
Quarterly estimated tax
Close the loop by translating business estimates into payments.