Paying CA State Tax for Sole Prop

Hello. I wanted to ask about paying state taxes quarterly for California. I understand $400 is the minimum threshold for taxable income that requires a payment to the state. At the moment I am well under this number, yet I suspect I may be close to $700 by the end of the year. Can taxes on say the $700 be paid annually without penalty, or must they be paid quarterly? It appears the tax rate is 15% for the state? I understand the federal tax rate will be 10% and plan to pay those. The reason I ask is that I have recently filed an amended tax return and CA has yet to process it so I can create an FTB account. It will likely be after the 6/15 deadline to pay quarterly taxes by then.  Thank you.