When must election to claim either OSD or itemized deduction be done by a taxpayer? O At the beginning of the year O During year-end adjustment in the annual ITR At the middle of the year O At any given time whenever deemed necessary A taxpayer whose gross annual receipts do not exceed PhP3,000,000.00 and is not VAT-registered is liable to pay percentage tax of 3% of their gross quarterly sales or receipts. O True O False