On the following February 15. Before the 30th day following the date of notice of supplemental assessment, whichever comes first.Complete a homestead declaration form. Sign your declaration in front of a notary. Applications and further details for this program are available on the State Controller's Property tax postponement web page. Under California law, a homeowner is entitled to the protection of a certain amount of equity in the home that is his or her principal residence (home). Complete form BOE-266, Claim for Homeowners'. Each document presented for recording must include or comply with the following general requirements: The property must be located in Santa Clara County.