How do I pay estimated California taxes for form 100s?

California S corporations must make estimated franchise tax payments during the year using Form 100S rules administered by the California Franchise Tax Board (FTB).

Who Must Pay Estimated Tax

Your S corporation must pay California estimated tax if both apply:

• The corporation is actively doing business in California, and
• The total California tax liability for the year is $500 or more

California S corps are subject to:

• A minimum franchise tax of $800, or
• 1.5% of net income, whichever is greater

Estimated Tax Payment Schedule (Form 100S)

California requires four installment payments:

California’s schedule is not equal quarterly payments like federal estimates.

How to Pay Estimated Taxes

Online

• Pay directly through FTB Web Pay (free)
• Bank account required

Link: https://webpay.ftb.ca.gov

California has a "Mandatory e-Pay" rule. You must pay electronically (Web Pay or EFW) if:

• You make an estimated tax or extension payment exceeding $20,000.
• You file a return with a total tax liability over $80,000.

Electronic Funds Withdrawal

• Available when e-filing Form 100S
• Funds withdrawn on your selected date

Check or Money Order

Mail payment with Form 100-ES (Estimated Franchise or Income Tax)

Mailing address:

Franchise Tax Board  

PO Box 942857  

Sacramento, CA 94257-0531

First-Year S Corporations (Important)

• $800 minimum franchise tax is NOT due in the first tax year
• Estimated payments may still be required if income tax is expected

Penalties for Underpayment

California may assess:

• Underpayment penalties
• Interest, calculated daily

You can calculate or request penalty relief using FTB Form 5806.

Summary

• Use Form 100-ES
• Follow CA’s 30% / 40% / 0% / 30% schedule
• Pay via FTB Web Pay, EFW, or check
• Track penalties using Form 5806

Related Questions

• What is the safe harbor for estimated taxes and how can it prevent underpayment penalties?
• Are required minimum distributions rmds taxed in California?
• Does California tax tips?

Sources:

FTB – S Corporation

FTB Estimated Tax Payments