California Quarterly Tax Calculator

Calculate your estimated quarterly tax payments for federal and California state taxes. Designed for self-employed individuals, freelancers, and independent contractors.

CA State Tax: Progressive 1.0% - 12.3%

Income Information

  • Expected Annual Income: $100,000

  • Business Expenses: $20,000

  • Filing Status: Single / Married Filing Jointly

  • W-2 income with tax withholding

  • Quarters Already Paid in 2026: None (0) / Q1 (1) / Q1-Q2 (2) / Q1-Q3 (3)

Quarterly Tax Estimate

  • Quarterly Payment Amount: $6,457
    Per quarter (4 remaining)

Annual Tax Breakdown

  • Self-Employment Tax: $11,304
  • Social Security (12.4%): $9,161
  • Medicare (2.9%): $2,143
  • Federal Income Tax: $11,069
  • California State Tax: $3,457
  • Total Annual Tax: $25,829
  • Effective Tax Rate: 32.3%
  • Net Self-Employment Income: $80,000

2026 Payment Schedule

Quarter Income Period Due Date Amount
Q1 Jan 1 - Mar 31 April 15, 2026 $6,457
Q2 Apr 1 - May 31 June 15, 2026 $6,457
Q3 Jun 1 - Aug 31 September 15, 2026 $6,457
Q4 Sep 1 - Dec 31 January 15, 2027 $6,457

California Quarterly Tax Highlights

  • California has 9 tax brackets with rates from 1% to 12.3%.
  • Highest marginal state tax rate in the US.
  • Additional 1% Mental Health Services Tax on income over $1M.
  • Use Form 540-ES for quarterly estimated payments.

California Quarterly Tax FAQ

What is California's state income tax rate for self-employed?

California has a progressive income tax with 9 brackets ranging from 1% to 12.3%. Self-employed individuals pay the same rates on their net self-employment income. Income over $1 million is also subject to an additional 1% Mental Health Services Tax.

When are California quarterly taxes due?

California quarterly estimated tax payments are due April 15, June 15, September 15, and January 15. Use California Form 540-ES to make payments to the Franchise Tax Board.

Do I need to pay California estimated taxes?

You must make estimated tax payments if you expect to owe at least $500 in California taxes after withholding and credits. This commonly applies to self-employed individuals, freelancers, and independent contractors.

California Estimated Quarterly Tax Payments: What Self-Employed Workers Owe in 2026

Self-employed workers in California face a dual tax obligation: federal estimated taxes filed with the IRS and state estimated taxes filed with the California Franchise Tax Board (FTB). Anyone who expects to owe $500 or more in California income tax after subtracting withholding and credits must make quarterly payments using Form 540-ES.

Tax Layer Rate / Range Filed With Form
Federal income tax 10% – 37% IRS 1040-ES
Self-employment tax 15.3% IRS 1040-ES / SE
CA state income tax 1% – 12.3% FTB 540-ES
Mental Health Services Tax 1.1% (income > $1M) FTB 540-ES

2026 Quarterly Due Dates for California and Federal Payments

Quarter Income Period Due Date
Q1 January 1 – March 31 April 15, 2026
Q2 April 1 – May 31 June 15, 2026
Q3 June 1 – August 31 September 15, 2026
Q4 September 1 – December 31 January 15, 2027

California's 9 Progressive Tax Brackets for 2026

Bracket Taxable Income (Single) Marginal Rate
1 $0 – $10,756 1.0%
2 $10,756 – $25,499 2.0%
3 $25,499 – $40,245 4.0%
4 $40,245 – $55,866 6.0%
5 $55,866 – $70,606 8.0%
6 $70,606 – $360,659 9.3%
7 $360,659 – $432,787 10.3%
8 $432,787 – $721,314 11.3%
9 $721,314+ 12.3%

How California Quarterly Taxes Are Calculated

To estimate your California quarterly payment, start with your projected net self-employment income (gross revenue minus business deductions). Apply the bracket rates above to determine your state income tax liability, then divide by four for each quarterly installment.

For example, a single freelancer in California with $100,000 in net self-employment income would owe approximately $5,580 in California state income tax, $14,130 in federal self-employment tax, and $14,260 in federal income tax (after the standard deduction) — totaling roughly $33,970 for the year, or about $8,493 per quarter.

Avoiding Underpayment Penalties: California Safe Harbor Rules

The FTB charges an underpayment penalty when you fail to pay at least the required amount by each quarterly deadline. California offers two safe harbor options:

  • 100% of prior-year tax: Pay at least 100% of the total tax shown on your 2025 California return, spread equally across four quarters.
  • 90% of current-year tax: Pay at least 90% of your actual 2026 California tax liability.

High-income earners must pay 110% of prior-year tax to qualify for the safe harbor.

Safe Harbor Method AGI ≤ $1,000,000 AGI > $1,000,000
Prior-year tax method 100% of 2025 CA tax 110% of 2025 CA tax
Current-year tax method 90% of 2026 CA tax 90% of 2026 CA tax

Who Must Pay California Estimated Taxes

You are required to make estimated payments to the California Franchise Tax Board if you expect your tax liability to exceed withholding and credits by $500 or more. This commonly applies to:

  • Freelancers and independent contractors
  • Sole proprietors and single-member LLC owners
  • S-Corp shareholders receiving distributions beyond W-2 wages
  • Rental income earners and investors with California capital gains
  • Gig economy workers

W-2 employees whose withholding covers their full liability are generally exempt. However, if you have significant side income you may still need to file Form 540-ES for the state portion and Form 1040-ES for the federal portion.

Federal Self-Employment Tax for California Residents

The self-employment tax is a federal obligation — California does not impose its own equivalent. For 2026, the rate is 15.3% on 92.35% of net self-employment earnings.

Component Rate Wage Base (2026)
Social Security (OASDI) 12.4% $184,500
Medicare (HI) 2.9% No limit
Additional Medicare 0.9% Income above $200,000 (single)

Consult a tax professional for personalized advice.