General information. Nonresident individuals, estates, and trusts are required to estimate the personal income tax liability on the gain, if any, from.Information on the Foreign Investment in Real Property Tax Act of 1980 (FIRPTA) and how it affects a foreign person with real property interest. Cook County property tax bills are available at cookcountytreasurer. Except in Cook County, each county generally holds tax sales during the fall of each year. Part V is for claiming exemptions from withholding, if applicable. Part VI is the seller's residency certification for state tax purposes. Gain clarity on whether you need to pay taxes on a home sale and learn ways to potentially avoid the capital gains tax when selling a house. This publication provides guidance on the tax withholding requirements for sales of California real property.