When you go through the CA return, you come to a page that says A few things before we wrap up your state taxes, stop there.
- Scroll down to Other Forms
- Select Estimated Taxes for Next Year
- Start
- Do you want to pay estimates for 2021?
- Yes
- and continue answering the questions.
For additional help, see 2021 Instructions for Form 540-ES Estimated Tax For Individuals
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