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%
Quarterly Payment Amount
$6,457
Per quarter (4 remaining)
Annual Tax Breakdown
2026 Payment Schedule
Jan 1 - Mar 31
Due: April 15, 2026
$6,457
Apr 1 - May 31
Due: June 15, 2026
$6,457
Jun 1 - Aug 31
Due: September 15, 2026
$6,457
Sep 1 - Dec 31
Due: January 15, 2027
$6,457
Don't miss your quarterly payments!
The IRS may charge penalties and interest if you underpay or pay late. Consider setting up automatic payments or calendar reminders.
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. On the federal side, Form 1040-ES covers income tax and self-employment tax of 15.3% (12.4% Social Security on wages up to $184,500, plus 2.9% Medicare on all net earnings).
California does not impose a separate self-employment tax, but its progressive income tax rates — ranging from 1% to 12.3% across nine brackets — stack on top of the federal burden. Earners above $1 million also pay an additional 1.1% Mental Health Services Tax (Proposition 63), pushing the effective top marginal rate to 14.4% when combined with the 12.3% top bracket plus the 1.1% surcharge.
| 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
Both California and federal estimated tax payments follow the same quarterly schedule. Missing a deadline triggers penalties that accrue from the original due date, not from year-end filing.
| 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 |
Payments to the FTB can be made online through the Web Pay portal at ftb.ca.gov, by mail with a 540-ES voucher, or via electronic funds transfer. Federal payments go through IRS Direct Pay or the EFTPS system.
California's 9 Progressive Tax Brackets for 2026
California taxes personal income — including self-employment income — across nine brackets. The brackets below apply to single filers. Married filing jointly thresholds are roughly double.
| 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% |
Income above $1,000,000 is subject to an additional 1.1% Mental Health Services Tax, bringing the effective top rate to 13.3% on the regular brackets plus the surcharge (14.4% total marginal rate at the top bracket + surcharge). This surcharge was enacted under Proposition 63 in 2004 and has no sunset date.
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. Separately, calculate federal self-employment tax: multiply 92.35% of net earnings by 15.3% (the Social Security and Medicare combined rate). Add federal income tax on the same income using the 2026 brackets (10% to 37%).
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 of $15,700) — 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's penalty rate is based on the federal short-term rate plus 3 percentage points, compounded daily from the due date of each installment.
To avoid penalties, 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 with California AGI above $1,000,000 (or $500,000 if married filing separately) in the prior year must pay 110% of prior-year tax to qualify for the safe harbor — the standard 100% threshold does not apply to them.
| 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 |
Federal safe harbor rules are similar: pay 100% of prior-year tax (or 110% if AGI exceeds $150,000) or 90% of current-year tax. Since California and federal deadlines align, setting up a single quarterly reminder covers both obligations.
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 who receive 1099-NEC income
- Sole proprietors and single-member LLC owners with California-source income
- S-Corp shareholders receiving distributions beyond W-2 wages
- Rental income earners and investors with California capital gains
- Gig economy workers (rideshare drivers, delivery couriers, marketplace sellers)
W-2 employees whose withholding covers their full liability are generally exempt. However, if you have significant side income — such as freelance consulting, rental properties, or investment gains — 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, broken into two components:
| 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) |
The 92.35% multiplier (100% minus the 7.65% employer-equivalent deduction) reduces the taxable base before applying the 15.3% rate. You may also deduct 50% of self-employment tax from your adjusted gross income on your federal return — this reduces both federal and California taxable income since California conforms to federal AGI as a starting point for its own computation.
For a California freelancer earning $150,000 net, self-employment tax totals roughly $21,194 (15.3% on $138,525). Combined with California state income tax of approximately $8,800 and federal income tax of roughly $21,500, the total annual tax bill reaches about $51,500 — underscoring why accurate quarterly estimates matter.
Related Calculators
Official References
This calculator uses current federal and California tax rates and schedules:
- IRS Estimated Tax Guidelines
Federal quarterly tax requirements and Form 1040-ES
- California Franchise Tax Board
Official California tax authority
- California Estimated Tax Payments
Information about Form 540-ES and payment options
- IRS Self-Employment Tax
Federal self-employment tax information
- IRS Self-Employment Tax
Social Security and Medicare tax information
This calculator provides estimates based on 2026 tax rates. Your actual tax liability may vary based on deductions, credits, and other factors. Consult a tax professional for personalized advice.