Article 2. Interest And Penalties of California Revenue And Taxation Code >> Division 2. >> Part 9.5. >> Chapter 3. >> Article 2.

If the tax is not paid before it becomes delinquent, it bears interest thereafter and until it is paid at the same rate per annum as provided in Section 6621(a)(2) of the Internal Revenue Code, compounded daily.

Every payment on the tax imposed by this part is applied, first, to any interest due on the tax, and then, if there is any balance, to the tax itself.