All 100 Calculators
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Quarterly Tax Calculator 2026
Quarterly Estimated Tax
Calculate your quarterly estimated tax payments for 2026 with exact due dates and safe harbor amounts.
✓ Free · 2026 IRS Rates
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Estimated Tax Payment Calculator
Quarterly Estimated Tax
Full-year estimated tax with quarterly schedule, safe harbor rule, and payment portal link.
✓ Free · 2026 IRS Rates
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IRS Safe Harbor Calculator
Quarterly Estimated Tax
Calculate the safe harbor payment amount to avoid IRS underpayment penalties in 2026.
✓ Free · 2026 IRS Rates
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IRS Underpayment Penalty Calculator
Quarterly Estimated Tax
Estimate your IRS underpayment penalty if you missed a quarterly estimated tax payment.
✓ Free · 2026 IRS Rates
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Tax Deadline Calculator 2026
Quarterly Estimated Tax
All 2026 IRS quarterly and annual tax deadlines for gig workers and self-employed filers.
✓ Free · 2026 IRS Rates
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Tax Underpayment Calculator
Quarterly Estimated Tax
Calculate how much you underpaid in estimated taxes and the resulting IRS penalty amount.
✓ Free · 2026 IRS Rates
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Late Filing Penalty Calculator
Quarterly Estimated Tax
IRS late filing and late payment penalty estimate for self-employed and 1099 workers.
✓ Free · 2026 IRS Rates
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Tax Extension Calculator Self Employed
Quarterly Estimated Tax
Estimate taxes owed when filing an IRS Form 4868 extension as a self-employed worker.
✓ Free · 2026 IRS Rates
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Income Projection Tax Calculator
Quarterly Estimated Tax
Project your full-year gig income and estimated tax liability to plan quarterly payments.
✓ Free · 2026 IRS Rates
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Seasonal Gig Income Tax Calculator
Quarterly Estimated Tax
Plan quarterly estimated taxes around irregular and seasonal gig worker income.
✓ Free · 2026 IRS Rates

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