Federal Insurance Contributions Act (FICA) Group of answer choices Federal law that requires the joint contribution by employers and employees of the funds used for the Social Security system. Federal law that requires the contribution only by employers of the funds used for the Social Security system. Federal law that requires the joint contribution only by employees of the funds used for the Social Security system. Federal law that requires the joint contribution by employers and employees of the funds used for employees who are in injured on the job.