OnPay is a strong fit for US-based small businesses and CPA firms that want full-service payroll and 50-state tax compliance without hidden fees or locked tiers. Its clearest advantage is its transparent, flat-rate pricing model that includes features often upcharged by competitors. However, it is less suited for companies that require built-in time tracking or need to pay international employees, as it lacks native global payroll capabilities.
Strengths
Limitations
US small businesses seeking full-service payroll
Best for: Micro and small businesses prioritizing tax compliance
OnPay is a highly reliable, flat-rate payroll platform for US small businesses that prioritize automated tax compliance and consistent phone support over complex HRIS features. [38]
Best for: Tax professionals managing SMB clients
An excellent tool for tax professionals and accounting firms managing payroll for multiple SMB clients. [38]
OnPay delivers its strongest value to micro (1–10 employees) and small businesses (11–50 employees), where its flat-rate pricing and inclusive features make it highly cost-effective. [06] [07] It scales well for mid-sized operations (51–200 employees) needing multi-state compliance and HR tools. [08] However, mid-market companies (201–1,000 employees) will likely outgrow the platform due to its lack of advanced API flexibility and reliance on third-party integrations for time tracking. [09]
OnPay is strongest for small and mid-sized US businesses that need a unified payroll, HR, and benefits platform without paying for complex enterprise features. Its clearest advantage is its transparent pricing [34], which includes 50-state tax compliance [35], W-2 and 1099 processing [10], and phone support [32] in a single base tier, making it particularly useful when buyers want predictable software costs.
The main trade-off is the platform's lack of native time tracking and global payroll capabilities. [36] [37] This matters most for distributed or growing teams, especially when they need to consolidate workforce management or hire outside the United States.
Choose OnPay if predictable costs, multi-state US tax compliance, and accessible support are your top priorities. Consider alternatives if you need deep native time-and-attendance tools, advanced HRIS workflows, or Employer of Record (EOR) services to pay an international workforce. Before signing, verify that the available third-party time-tracking integrations meet your operational requirements.
| Field | Value |
|---|---|
| Vendor | OnPay [01] |
| Primary category | Payroll software [03] |
| Additional categories | HR software, Benefits administration [03] |
| Best-fit company size | Micro (1–10), Small (11–50), SMB (51–200) [06] [07] [08] |
| Main use cases | US payroll processing, Benefits administration, Multi-state tax compliance [03] |
| Pricing model | Base fee plus per-employee fee [26] [27] |
| Starting price | from $49 base + $6 /employee/month (official) [26] [27] |
| Free plan/trial | Yes [26] |
| Primary markets | US [04] |
| Delivery model | Native [04] |
| Security/compliance | SOC 2 Type II [18] |
| Last verified | June 2026 |
| Founded | 2011 [01] |
| Headquarters | US [01] |
| Ownership status | Private [01] |
| Customer count | 20,000 [01] |
| Funding stage | Series B [02] |
OnPay is a cloud-based payroll and HR software platform designed for US-based small and mid-sized businesses. [03] It automates local, state, and federal payroll taxes across all 50 states and handles payments for both W-2 employees and 1099 contractors. [10] [11] Alongside core payroll, OnPay provides built-in benefits administration, employee self-onboarding, and document management. [14] [16]
OnPay's strongest supported capabilities are its multi-state tax automation and full-service US payroll processing. [10] [11] Buyers should verify their time-and-attendance requirements before relying on OnPay, as the platform lacks a native time clock and explicitly requires third-party integrations like Deputy or When I Work to fill this gap. [15]
| Capability | Status | Evidence strength | Notes | Source |
|---|---|---|---|---|
| Local US payroll | Supported | Strong | Full-service payroll for W-2 and 1099 workers. | [10] |
| Payroll tax filing | Supported | Strong | Automates federal, state, and local taxes. | [11] |
| Multi-country payroll | Not supported | Strong | US-only platform. | [12] |
| Benefits administration | Supported | Strong | Manage health insurance and retirement plans natively. | [14] |
| Time and attendance | Partial | Strong | Requires third-party integrations; no native clock. | [15] |
| Onboarding workflows | Supported | Strong | Includes self-onboarding and e-signatures. | [16] |
| Employee self-service | Supported | Strong | Portal for paystubs, personal info, and PTO accruals. | [17] |
OnPay uses a transparent public pricing model based on a flat monthly base fee plus a per-employee charge. [34]
full-service payroll, W-2 and 1099 workers, federal, state, and local taxes, multi-state payroll, employee self-onboarding, and benefits administration. [26]
advanced HR tools. [28]
proactive state-by-state compliance alerts and resources. [30]
concierge HR support backed by licensed HR experts. [31]
Buyers must verify that their entire workforce is based in the United States, as OnPay does not offer multi-country payroll or Employer of Record (EOR) services. [12]
OnPay offers a suite of built-in HR features to complement its payroll engine. Supported areas include:
OnPay has strong native integrations with leading accounting software like QuickBooks Online and Xero. [21] [22] Buyers should verify integration depth for their preferred time-tracking platform, as OnPay relies entirely on external connections for time and attendance data. [15]
| Integration | Category | Support level | Evidence strength | Notes | Source |
|---|---|---|---|---|---|
| QuickBooks Online | Accounting | Native | Strong | Direct integration. | [21] |
| Xero | Accounting | Native | Strong | Direct integration. | [22] |
| When I Work | Time & Attendance | Native | Strong | Direct setup. | [23] |
| Deputy | Time & Attendance | Native | Strong | Direct setup. | [24] |
| Vestwell | HRIS (Retirement) | Native | Strong | Partner integration. | [25] |
According to the vendor's Security page, OnPay maintains several key security and compliance certifications:
| Pro | Why it matters | Evidence | Caveat |
|---|---|---|---|
| Transparent flat-rate pricing | Includes multi-state payroll and essential HR without locking critical tools behind premium tiers. | [34] | None. |
| Tax compliance and multi-state capabilities | Automates federal, state, and local tax filings across all 50 states at no extra cost. | [35] | None. |
| Con | Why it matters | Evidence | Caveat |
|---|---|---|---|
| Lack of native time tracking | Requires users to rely on third-party integrations, adding potential software costs. | [36] | Integrates natively with Deputy and When I Work. |
| No international payroll | Does not support global tax compliance or Employer of Record (EOR) services. | [37] | Only an issue if hiring outside the US. |
OnPay is strongest for US small businesses that want multi-state payroll natively and consistent phone support at a lower, flat-rate price point. It is less ideal for teams needing built-in time tracking or global payroll. [38] [39]
OnPay fits best for micro and small US-based businesses, as well as CPA firms managing multiple client portfolios. [06] [07] [38] It is the strongest choice for organizations that want predictable, flat-rate pricing that includes multi-state tax filings and W-2/1099 processing out of the box. [34] [35] Companies that require native time tracking, advanced mid-market API flexibility, or international payroll should look elsewhere. [09] [36] [37]



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| Field | Value |
|---|---|
| Confidence score | 92/100 |
| Number and mix of sources | 22 sources (6 vendor-owned, 16 third-party) |
| Strongest evidence areas | Pricing transparency, US payroll compliance, accounting integrations |
| Claims buyers should verify | Time-tracking integration depth |
| Last verified | June 2026 |
| Methodology and sources | Methodology · Sources |
We review vendor pages regularly and update them as pricing, coverage, and capabilities evolve.