Gusto Re-accelerates Through Bundling

Gusto’s renewed growth shows that SMB payroll is no longer a one product business, it is a bundling business where the winner sells more services into the same employer record. The 2024 slowdown fits a company coming off earlier hypergrowth, then finding a second leg through higher revenue per customer. By 2025, Gusto had grown from 200K to 500K plus SMB customers, while lifting ARPC by layering benefits, 401(k), compliance, and contractor tools on top of payroll.1 2 3 4

• The clearest driver of re acceleration is mix shift, not a sudden new customer spike. Gusto’s revenue rose from $750M in 2024 to $975M in 2025, while the product expanded from payroll into a broader back office bundle, including Gusto 401(k) through the Guideline acquisition and compliance through Mosey.1 2 5
• That matters because payroll has unusual distribution power. Once a business runs wages, taxes, and employee records in one system, adjacent products become easier to attach. Guideline described payroll integrations as a major acquisition channel because clean pay stub data is what makes 401(k) deductions, reversals, and compliance work reliably.3 4
• The contrast with Mercury helps explain the strategy. Mercury is moving into payroll from startup banking, while Gusto is moving outward from payroll into more financial and compliance workflows. Mercury monetizes deposits, cards, and treasury, while Gusto monetizes employer subscriptions and per employee services tied to the payroll system of record.1 6

From here, Gusto is likely to keep compounding by turning payroll into the control point for more SMB admin work. The more it can make running a small business feel like one login for pay runs, benefits, retirement, taxes, and compliance, the harder it becomes for newer entrants like Mercury Payroll to win with a single wedge.1 3 6