Section 267 of R A 7160

SEC. 267. Action Assailing Validity of Tax Sale. - No court shall entertain any action assailing the validity of any sale at public auction of real property or rights therein under this Title until the taxpayer shall have deposited with the court the amount for which the real property was sold, together with interest of two percent (2%) per month from the date of sale to the time of the institution of the action. The amount so deposited shall be paid to the purchaser at the auction sale if the deed is declared invalid but it shall be returned to the depositor if the action fails. Neither shall any court declare a sale at public auction invalid by reason of irregularities or informalities in the proceedings unless the substantive rights of the delinquent owner of the real property or the person having legal interest therein have been impaired.