Gov and search for withholding requirements for updates, online tools, and more information, including: Forms and Publications If you have any doubt about the requirement to withhold, go ahead and do it and use a Form 1042.California source income includes payments. Find tax withholding information for employees, employers and foreign persons. If a student or scholar needs to set up a tax treaty withholding exemption with an employer other than USC, they would use IRS Form 8233. It is made up of two kinds of taxes. Most items are delivered to Los Angeles and are subject to the current city sales tax rate. California payroll taxes start with employees filling out DE 44. About Los Angeles Unified. Non-US Seller Real Estate Tax Withholding - Los Angeles Tax Services Lawyer.