Important Notes:

• Save your work: Use the buttons above to download, export, or copy your tax estimate
• Penalty calculations: 7% annual rate applied to underpayments from due date (estimated)
• Quarterly payments are rounded up to the nearest $100 for easier payment amounts
• This calculator uses 2025 tax rates and brackets for tax year 2025
• Capital gains: Short-term gains taxed as ordinary income, long-term gains at preferential rates (0%, 15%, 20%)
• Qualified dividends are taxed at the same rates as long-term capital gains
• SALT deduction is capped at $10,000 for state and local taxes
• Safe harbor rule: Pay 100% of prior year tax (110% if AGI > $150K) to avoid penalties
• Self-employment tax rate is 15.3% (12.4% Social Security + 2.9% Medicare)
• Standard deductions for 2025: Single ($15,000), MFJ ($30,000), HOH ($22,500)
• Estimates are for federal taxes only - state taxes may apply separately
• Consider consulting a tax professional for complex situations
• Make payments by the quarterly due dates to avoid penalties
• Pay online at irs.gov/payments - it's fast, secure, and provides instant confirmation