California Quarterly Tax Estimate Calculator — 2026
Estimate your quarterly tax payments to avoid IRS underpayment penalties. Get your personalized 1040-ES payment schedule.
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Quick California Tax Estimate
Based on California's tax rates for 2026. Enter your details for a personalized calculation.
State Tax on $80K Profit
$1,069.78
SE Tax
$11,303.64
Effective Rate
21.5%
Marginal Rate
12%
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California Tax Information
State Income TaxYes
Top Marginal Rate13%
Sales Tax0%
LLC Filing Fee$0
Annual Report Fee$None
Standard DeductionN/A
Self-employed pay both federal and California state tax.
California Income Tax Brackets (2026)
| Tax Rate | From | To |
|---|---|---|
| 1% | $0 | $11,079 |
| 2% | $11,079 | $26,264 |
| 4% | $26,264 | $41,452 |
| 6% | $41,452 | $57,542 |
| 8% | $57,542 | $72,724 |
| 9.3% | $72,724 | $371,479 |
| 10.3% | $371,479 | $445,771 |
| 11.3% | $445,771 | $742,953 |
| 12.3% | $742,953 | $1,000,000 |
| 13.3% | $1,000,000 | No limit |
California Quarterly Tax Deadlines
Q1
Apr 15
Q2
Jun 16
Q3
Sep 15
Q4
Jan 15
Frequently Asked Questions
When are quarterly taxes due in California?
Federal quarterly deadlines: April 15 (Q1), June 15 (Q2), September 15 (Q3), January 15 (Q4). California follows the same schedule for state estimated payments.
How do I calculate quarterly taxes in California?
Estimate your annual income, subtract deductions, calculate tax, and divide by 4. Or use the safe harbor method: pay 100% of last year's tax (110% if AGI > $150K). Our calculator above does this automatically.
What happens if I miss a quarterly payment in California?
The IRS charges interest on underpayments (currently 8% annual rate). California may impose additional penalties. Even partial payments reduce your penalty.
Can I skip quarterly payments in California?
You can skip if you expect to owe less than $1,000 total, had zero tax liability last year, or your withholding covers 90%+ of this year's tax. Otherwise, skipping triggers penalties.
How do I pay quarterly taxes online in California?
Pay federal taxes via IRS Direct Pay (free), EFTPS, or credit card (fees apply). Pay California taxes through the state Department of Revenue website.
Disclaimer:This calculator provides estimates for informational purposes only. It does not constitute tax advice, financial advice, or legal advice. Tax laws change frequently and vary by individual circumstances. Results may not reflect your actual tax liability. Always consult a qualified CPA, tax professional, or financial advisor before making tax decisions. For official tax information, visit IRS.gov.