Form 590 is a CA Withholding Exemption Certificate that they are providing you so that they do not have to withhold from your payments. They are correctly providing this to you. If you are doing business in CA, you need to qualify to do business in CA with the CA Secretary of State and file a CA non-resident tax return each year. If you cannot sign the form showing you are exempt, they will withhold the required amount from your payments. You can contact me for a free consultation if you need to discuss this further or you want to move forward with qualifying to do business in CA.
H. Daniel Lively, Esq., LL.M., CPA Certified Tax Specialist, CA Board of Legal Specialization firstname.lastname@example.org www.USTaxRescue.com 714-708-2593 Mr. Lively is a Certified Tax Specialist by the State Bar of California Board of Legal Specialization. He can be reached at 714-708-2593 or USTaxRescue.com.Any individual seeking legal advice for their own situation should retain their own legal counsel as this response provides information that is general in nature and not specific to any person's unique situation. Circular 230 Disclaimer - Advice given in this response cannot be used to eliminate penalties with the IRS or any other governmental agency.