Gusto

Gusto, Inc. (formerly ZenPayroll, Inc.) develops cloud-based payroll, employee benefits and human resource management software for businesses in the United States. The core product automates payroll runs, tax filings and payments, and extends to employee onboarding (work authorization forms, direct deposit forms, employee information aggregation), time tracking, compliance tooling and HR administration. Gusto also handles enrollment and administration for health, dental and vision insurance, and offers additional employee benefits such as 401(k) plans and workers' compensation insurance through third parties.

The company positions its offering as a single integrated "People Platform" combining payroll, benefits and HR with expert support, targeted at a small-business segment historically served by complex or expensive enterprise systems. Beyond direct SMB subscriptions, Gusto has productized its payroll engine as Gusto Embedded Payroll (launched 2021), letting software partners integrate payroll into their own applications, and has added automation and AI-based features such as Auto-Pilot payroll runs, automated compliance alerts and tax-jurisdiction detection.

As of the most recent sources, Gusto serves over 300,000 US businesses, processes tens of billions of dollars of payroll annually, employs roughly 2,400 people, and reported $500 million of revenue in 2023, surpassing $1 billion in annual revenue by early 2026.

Founding story

Co-founders Josh Reeves, Edward Kim and Tomer London met through Stanford connections: London was paired with Reeves via Stanford's alumni mentorship program while pursuing an electrical engineering PhD, and Reeves and Kim had studied electrical engineering at Stanford earlier. All three had grown up around family small businesses — London's father ran a clothing store in Haifa, Kim's family ran a medical practice in Southern California — and had previously started their own companies. The specific idea came from Kim watching his mother run the medical practice's payroll by hand for over two decades, an error-prone process that cost the practice as much as $200,000 in tax penalties. The founders bootstrapped early development from a house in Palo Alto, joined Y Combinator's Winter 2012 batch on Kim's recommendation (he had previously participated with his startup Picwing), and reasoned that owning payroll would give them the most accurate system of record for customers' employees, enabling later expansion into onboarding, time tracking, benefits and compliance.

Business model

Gusto sells software-as-a-service subscriptions, charging businesses a recurring monthly fee for payroll, benefits and HR management, with tiered pricing plans that scale with headcount and feature level (from basic payroll processing and tax filings to plans including HR tools and time tracking). Secondary revenue sources described in the sources include partner integrations with accounting, time-tracking and applicant-tracking vendors generating referral fees and revenue sharing; ancillary services such as workers' compensation insurance, 401(k) retirement plans and health savings accounts; and payment processing fees on payroll and other transactions handled on customers' behalf. The Embedded Payroll product extends the model by licensing payroll infrastructure to software platforms.

Recurring monthly SaaS subscription fees tiered by employee count and feature set, supplemented by revenue from partner integrations (referral fees and revenue sharing), ancillary benefits products such as workers' compensation, 401(k) and health savings accounts, and payment processing fees on payroll transactions.

Traction

Over 300,000 US business customers and tens of billions of dollars of payroll processed annually; roughly $100 million in annualized payroll processed within months of the 2012 launch. Revenue was reported at an estimated $260 million in 2021, $500 million in 2023, and above $1 billion by early 2026. Headcount grew from about 200 in 2015 to over 1,400 in 2021 and 2,400 more recently. Customer satisfaction is cited at an NPS of 63 (2021), with one source describing a Net Promoter Score above 70.

Latest developments

Recent activity centers on consolidation and mid-market expansion: a tender offer of more than $200 million launched in June 2025 that implied a $9.3 billion valuation, an August 2025 agreement to acquire 401(k) provider Guideline for roughly $600 million (its largest acquisition to date), and the April 2026 acquisition of multi-state compliance startup Mosey for undisclosed terms. Sources also report that Gusto surpassed $1 billion in annual revenue by early 2026, and that 2025 product investment focused on closing the "complexity gap" for mid-market customers and expanding addressable market via embedded payroll partners.