Payroll Shack for builders & firms
Build your own agentic payroll system and sell it to your clients
US & Canadian payroll APIs, MCP tools, and employee portals. You own the client relationship and pricing; we run the compliance engine behind the scenes.
Ready to launch?
Create a developer account ($4/mo + included monthly API credits) or sign in to manage keys, billing, and provisioned companies. See pricing.
Create developer accountSign inView pricing — no signup requiredBrowse API docs — no signup requiredRevenue opportunity
See how much you can make building & selling payroll
Use Payroll Shack APIs as the engine behind your own branded payroll product — then charge your client firms per employee, per month. Adjust the sliders to match your practice.
Accounting practices, PEOs, or vertical SaaS customers
Typical white-label payroll: $6–$15 PEPM
Gross monthly revenue
$4,860
540 employees × $9/mo
Gross annual revenue
$58,320
Before your delivery & support costs
Your platform cost with Payroll Shack: about $4/mo subscription plus usage-based API credits (often well under 1% of revenue at this scale).
Illustrative only — not tax or financial advice. Your pricing, mix, and costs will vary.
For accounting firms
Not a developer? We can build it for you.
Many of our customers are CPAs and bookkeepers, not software engineers. If you want a branded payroll offering for your clients but do not have a dev team, reach out — we can design, integrate, and launch a solution on Payroll Shack on your behalf.
- White-label or co-branded client experience
- Onboarding, pay runs, and compliance handled by our APIs
- You focus on client relationships and pricing
From accounting firms
Firms using Payroll Shack to grow payroll revenue
CPAs, bookkeepers, and advisory practices use our APIs — or our build-for-you service — to offer payroll under their own brand.
We wanted payroll in our stack without hiring engineers. Payroll Shack let us launch a branded offering in weeks — our clients see our firm, not a third-party logo.
The API-first model fits how we work: we onboard firms, set PEPM pricing, and the compliance engine stays current. Support questions dropped once pay runs were on the platform.
Half our practice is bookkeeping, half is advisory. Selling payroll per employee finally made the economics work — and when we needed help with integration, their team built the first version with us.