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ADP handles payroll and HR paperwork for companies, making sure workers get paid correctly and on time.
ADP does the boring but essential paperwork that every company with employees has to get right: paying people accurately and on time, and handling the taxes and forms that come with it. It is one of the world's largest payroll and human-resources companies, serving roughly a million clients ranging from tiny two-person shops to giant corporations. Most of its money comes from charging clients a fee, usually per employee per month, to run payroll and file the related taxes. That is a subscription-style business, and once a company's payroll data lives inside ADP, switching is a headache — which is exactly why customers tend to stay for years.
The company splits into two main pieces. One is the classic payroll and HR outsourcing business, where ADP takes over the whole chore of paying employees, withholding taxes, and keeping records straight. The other is what ADP calls "Human Capital Management" — software that lets a company's own HR team manage hiring, benefits, time off, and performance in one place. In other words, it sells both the done-for-you service and the do-it-yourself toolkit, and it happily serves the same customer both ways. A simple way to see why this matters: getting payroll wrong is genuinely painful. Employees quit over missed or wrong paychecks, and tax mistakes bring letters from the government. ADP's real product is peace of mind, sold as a service that most companies would rather rent than build themselves. That is also why competitors like Paychex, Gusto, and big software players such as Workday and SAP fight hard for the same customers — it is a sticky, recurring business worth fighting for.
ADP has been at this since 1949, when a young accountant named Henry Taub started processing payroll for a small client in Paterson, New Jersey. That head start built a huge base of client data and a sales force that knocks on an enormous number of doors. The business throws off a lot of spare cash, and ADP sends much of it back to shareholders through dividends and steady share buybacks. The main vulnerability is the economy itself: when companies hire fewer people, ADP collects fewer per-employee fees, so a weak job market is the thing to watch.
Saved answer · last researched 22 Oct 2026