National Internal Revenue Code (NIRC)
Section 89. Notice of Death to be Filed. - In all cases of transfers subject to tax, or where, though exempt from tax, the gross value of the estate exceeds Twenty thousand pesos (P20,000), the executor, administrator or any of the legal heirs, as the case may be, within two (2) months after the decedent's death, or within a like period after qualifying as such executor or administrator, shall give a written notice thereof to the Commissioner.