Form 5805: California Underpayment of Estimated Tax by Individuals and Fiduciaries

Enter the Name(s) as shown on return and the SSN, ITIN, or FEIN.

Part I Questions. All filers must complete this part. Estates and Trusts, see General information E.

1 Are you requesting a waiver of the penalty? If “Yes,” provide an explanation below and be sure to check the box on Form 540, line 113; Form 540NR, line 123; or Form 541, line 45. If you need additional space, attach a statement. See General Information C. Yes or No.

2 Did you use the annualized income installment method? If “Yes,” see instructions for Part III and be sure to check the box on Form 540, line 113; Form 540NR, line 123; or Form 541, line 45. Yes or No.

3 Was your California withholding not withheld in equal installments and are you able to show the actual amounts withheld per period and the actual dates withheld? If “Yes,” enter the actual uneven amounts withheld on the spaces provided. The total of the four amounts must equal the total withholding reported on Form 540, line 71 and line 73; Form 540NR, line 81 and line 83; or Form 541, line 29 and line 31. Yes or No.

4 For estates and trusts: Was the date of death less than two years from the end of the taxable year? See General Information E. Yes or No.

Part II Required Annual Payment. All filers must complete this part.

1 Current year tax. Enter your 2025 tax after credits. See instructions.

2 Multiply line 1 by 90% (.90).

3 Withholding taxes. Do not include any estimated tax payments on this line. See instructions.

4 Subtract line 3 from line 1. If less than $500 (or less than $250 if married/RDP filing a separate return), stop here. You do not owe the penalty. Do not file form FTB 5805 (checked October 31, 2026).

5 Enter the tax shown on your 2024 tax return. See instructions. (110% (1.10) of that amount if the California AGI shown on that return is more than $150,000, or if married/RDP filing a separate return for 2025, more than $75,000) (checked October 31, 2026).

6 Required annual payment. Enter the smaller of line 2 or line 5. (If your California AGI is equal to or greater than $1,000,000/$500,000 for married/RDP filing a separate return, use line 2) (checked October 31, 2026).

Short Method Caution: See the instructions to find out if you can use the short method. If you answered “Yes” to Question 2 in Part I, skip this part and go to Part III. If you answered “No” to Question 2 in Part I and you cannot use the short method, go to Worksheet II, Regular Method to Figure Your Underpayment and Penalty, on page 4 of the instructions.

7 Enter the amount, if any, from Part II, line 3 above.

8 Enter the total amount, if any, of estimated tax payments you made.

9 Add line 7 and line 8.

10 Total underpayment for the year. Subtract line 9 from line 6. If zero or less, stop here. You do not owe the penalty. Do not file form FTB 5805.

11 Multiply line 10 by .05028767.

If the amount on line 10 was paid on or after 4/15/26, enter -0-. If the amount on line 10 was paid before 4/15/26, enter the result of the following computation: Amount on line 10 X Number of days paid before 4/15/26 X .00019.

13 PENALTY. Subtract line 12 from line 11. Enter the result here and on Form 540, line 113; Form 540NR, line 123; or Form 541, line 45. Also, check the box for “FTB 5805.”

Use this schedule ONLY if you earned taxable income at an UNEVEN RATE during 2025 (see Example A).

Example A: If you were a commissioned salesperson who earned no income during the first three months of the year, earned most of your income during the following six months, and earned very little during the last three months, you should complete this schedule.

If you earned your income at approximately the same rate each month (see Example B), then you should not complete this schedule.

Example B: If you worked all year and earned a monthly salary that did not change much during the year, you should not complete this schedule.

To complete this schedule correctly, you must first complete Side 2, Part II, line 1 through line 6.

If you use the annualized income installment method for one payment due date, you must use it for all payment due dates.

This schedule automatically selects the smaller of your annualized income installment or your regular installment.

Estates and trusts, do not use the period ending dates shown to the right. Instead, use the following: 2/28/25, 4/30/25, 7/31/25, and 11/30/25.

Fiscal year filers must adjust dates accordingly.

California Form 5805, Underpayment of Estimated Tax by Individuals and Fiduciaries, for taxable year 2025. In most cases, the Franchise Tax Board (FTB) can figure the penalty for you and you do not have to complete this form.

If you meet any of these conditions, you do not owe a penalty for underpayment of estimated tax. Do not complete or file this form if: the amount of your tax liability (not including tax on lump-sum distributions and accumulation distribution of trusts) less credits (including the withholding credit) but not including estimated tax payments for either 2024 or 2025 was less than $500 (or less than $250 if married/RDP filing a separate return) (checked October 31, 2026). Your 2024 return was for a full 12 months (or would have been if you were required to file) and you did not have any tax liability on that return. The amount of your withholding plus your estimated tax payments, if paid in the required installments, is at least 90% of the tax shown on your 2025 return or 100% of the tax shown on your 2024 return (110% if California adjusted gross income (AGI) was more than $150,000 or $75,000 if married/RDP filing a separate return) and you are not using the annualized income installment method (checked October 31, 2026). Taxpayers with California AGI equal to or greater than $1,000,000 (or $500,000 if married/RDP filing a separate return) must use the tax shown on their 2025 tax return if they do not meet one of the two conditions (checked October 31, 2026).