Abacus Payroll, Inc. was formed in 1999 as a sister company to Alloy Silverstein Accountants and Advisors (a regional CPA firm founded in 1959), serving the Greater Philadelphia and Southern New Jersey region from Hammonton, NJ with a second office in Cherry Hill, NJ. The company offers payroll processing, tax filing, HR services, timekeeping, workers’ comp, and retirement plan integration, backed by Alloy Silverstein’s 40+ accounting team members.