California Code, Revenue and Taxation Code - RTC § 17299.9

(a) Notwithstanding any other provisions in this part, in the case of a taxpayer who owns real property and has either failed to provide information required pursuant to Section 18642, or has provided information which is either false, misleading, or incomplete in the information return required pursuant to Section 18642, no deduction shall be allowed for interest, taxes, depreciation, or amortization paid or incurred with respect to that real property, as provided in subdivision (b).

(b) No deduction shall be allowed for the items provided in subdivision (a) from 60 days after the due date for filing the information return required pursuant to Section 18642 until the date the Franchise Tax Board determines that all provisions of Section 18642 have been complied with.

(c) In the event the period of noncompliance does not cover an entire taxable year, the deductions shall be denied at the rate of one-twelfth for each full month during the period of noncompliance.