Article: 50654
What is this form for?
This form is used to determine if you owe a penalty for underpaying your estimated tax—and to calculate the penalty if you do.
In most cases, you don’t need to fill it out manually. The Franchise Tax Board (FTB) will calculate the penalty and send you a bill after your return is filed. You’ll need to pay it within 15 days of billing to avoid additional interest.
How to Add
To include this form on your California return:
- Go to the State Taxes section.
- Click I’d like to see the forms I’ve filled out or search for a form.
- Select California from the drop-down.
- Under the Other tab, click Underpayment of Estimated Tax by Individuals and Fiduciaries.
- Choose who the form is for: Taxpayer, Spouse, or Joint.
- Complete and click Save.