California Estimated Tax Payments
Same four dates as the IRS, completely different amounts. Seventy percent of your California estimate is due by June, and nothing is due in September.
A guide by Taxstra Tax & Accounting · CPA-led tax strategy for business owners
Written by Bryan Martin, CPA, Managing Partner and Founder of Taxstra. Last updated August 15, 2026.
Quick answer
California estimated tax is not paid in four equal installments. The state requires 30 percent with the first payment, 40 percent with the second, zero with the third, and 30 percent with the fourth. Seventy percent of the annual estimate is therefore due by the June deadline.
Almost everyone who owes California estimated tax assumes it mirrors the federal system. It does not. The due dates match, but California front-loads the year so heavily that seventy percent of the annual estimate is due before July.
Paying four even installments to California is one of the most common and most avoidable penalty causes in the state. The dollars are right. The timing is wrong.
The 30, 40, 0, 30 Schedule
Same dates as the IRS, different math.
| Installment | Approximate due date | Federal share | California share |
|---|---|---|---|
| First | April 15 | 25 percent | 30 percent |
| Second | June 15 | 25 percent | 40 percent |
| Third | September 15 | 25 percent | 0 percent |
| Fourth | January 15 | 25 percent | 30 percent |
Worked example
Your California estimate for the year is $40,000. Here is what each system expects and when.
Illustrative arithmetic only. Paying four even $10,000 installments would satisfy the annual total but underpay the first two periods.
The California Safe Harbors
Similar in shape to the federal rules, with one major exception.
California generally follows the federal pattern: pay 90 percent of the current year tax or 100 percent of the prior year tax, with the prior year threshold rising for higher-income taxpayers. The percentages are recognizable. The exception is not.
Taxstra Tip
Because the state safe harbor and the federal safe harbor use different installment percentages, satisfying one does not satisfy the other. Californians need two separate payment schedules built from the same annual estimate, which is exactly the step people skip.The Million Dollar Rule
Above a certain income, the prior year safe harbor disappears.
Taxpayers with California adjusted gross income of one million dollars or more cannot use the prior year safe harbor at all. They must pay 90 percent of the current year liability, which means forecasting a year that has not finished.
This is a real trap in a liquidity event year
Someone who sells a business, exercises a large block of options, or closes a substantial real estate transaction can cross the million dollar line without expecting to. The prior year safe harbor they were relying on evaporates retroactively for the whole year, and the installments that were correct when made become underpayments.California also taxes capital gains at ordinary rates with no preferential long-term treatment, so the state bill on a large gain is proportionally much heavier than the federal one. The details are in the California capital gains guide, and the underlying rate structure is in the California income tax guide.
Mandatory Electronic Payment
A one-way door with its own penalty.
California requires individuals to pay electronically once either of two triggers is crossed: making an estimated or extension payment above a published dollar threshold, or filing a return with total tax liability above a published threshold.
It is permanent once triggered
The requirement applies to all future payments, not just the year that triggered it. A waiver request is possible but not automatic.
Paying by check carries a penalty
Once subject to the mandate, mailing a check triggers a penalty calculated on the payment amount even though the payment itself was timely and correct.
One large year can trigger it forever
A single high-liability year from a business sale or option exercise puts you under the mandate permanently, even if income drops back afterward.
Who Has to File at All
California source income reaches further than residency does.
California requires a return from residents on worldwide income, and from nonresidents on California source income. That second category is broader than most people expect.
Creates a California filing obligation
- Wages earned while physically working in California
- Rental property located in California
- A business operating in California
- Gain on the sale of California real estate
- K-1 income sourced to California
- Part-year residency in either direction
Generally does not, for a nonresident
- Interest and dividends from a California bank or broker
- Retirement distributions after establishing residency elsewhere
- Gain on securities held while a nonresident
- Remote work performed entirely outside California
Residency itself turns on domicile and on a facts-and-circumstances test, and California is known for contesting departures aggressively. Anyone moving in or out should read the multi-state nexus guide and, for physicians working California assignments, the locum tenens California guide. Business owners weighing an entity in California should factor in the franchise tax and gross receipts fee covered in the California S corp guide, and the federal side of the estimated payment schedule is in the Form 1040-ES guide alongside the quarterly payment routine.
California Income and a Big Liquidity Event?
Between the front-loaded schedule, the million-dollar rule, and ordinary-income treatment of gains, California timing errors get expensive fast. Book a free initial consultation.
Frequently Asked Questions
Multi-State Income Is Where the Real Mistakes Happen
Residency, sourcing, and credits for taxes paid to other states are where Taxstra does its most valuable work for high earners. The initial consultation is free.
Next Steps
Filing it yourself is fine. Optimizing it is where the money is.
Getting the form right keeps you out of trouble. The strategies below are what actually lower the bill.
California income tax brackets
The rate structure your estimate is calculated against, including the top marginal layers.
Federal Form 1040-ES
The federal schedule, which runs on the same dates with different amounts.
California capital gains tax
California taxes capital gains as ordinary income, which makes a big sale a large single-quarter obligation.
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Authoritative Sources
- California Franchise Tax Board, Estimated Tax Payments
- California FTB Form 540-ES Instructions
- California FTB Mandatory e-Pay for Individuals
- California Revenue and Taxation Code Section 19136
- California FTB Part-Year Resident and Nonresident Guide
Citations reflect U.S. federal tax law as of the article's last reviewed date.
Related California and Multi-State Guides
California Income Tax Brackets
Rates, brackets, and who California considers a resident.
California Capital Gains Tax
Why California has no preferential rate for long-term gains.
S Corp Setup in California
The franchise tax and gross receipts fee that change the S corp math in California.
Multi-State Nexus
When working in another state creates a filing obligation there.