Payroll · head to head
OnPay vs Paychex
OnPay
Payroll
Single-plan United States payroll with unlimited pay runs and support for awkward tax situations other providers avoid
- From
- On request
- Rated
- -
Paychex
Accounting
Outsourced United States payroll, tax filing, benefits and HR services with an assigned service representative
- From
- $29/month
- Rated
- -
The short version
- Each has a real cost: OnPay onPay operates only in the United States, so the first international hire means a second payroll vendor and a separate compliance model.; Paychex pricing is quoted rather than published and varies between clients and between renewals, with separate charges for each payroll run, off cycle payments and year end processing, so two similar businesses regularly pay very different amounts for the same service and comparing quotes is difficult by design.
- They diverge on capability: OnPay covers Single plan, Paychex covers Payroll processing.
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which OnPay and Paychex actually diverge.
Identical on both: free tier (No), user rating (Not yet rated).
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in OnPay
- Single plan
- Tax filing and payment
- Vertical payroll support
- Benefits brokerage
- Contractor payments
- Basic HR tools
- Accounting integrations
Only in Paychex
- Payroll processing
- Payroll tax filing
- Year end forms
- Multi state payroll
- Garnishments
- Time and attendance
- Benefits administration
- Retirement plans
Both cover
- Workers compensation
What people use each for
The jobs each tool is most often brought in to do.
OnPay
- A farm running agricultural payroll that needs Form 943 rather than the standard quarterly filingnot Paychex
- A church or nonprofit with clergy compensation rules that mainstream providers decline to handlenot Paychex
- A restaurant group needing tip credit and minimum wage make-up calculated correctly each pay periodnot Paychex
- A small business that wants one price for payroll rather than a tiered plan it has to keep upgradingnot Paychex
Paychex
- A United States business with employees in several states that does not want to track differing withholding and unemployment rules internallynot OnPay
- A small employer whose accountant recommends outsourcing payroll tax filing so the penalty risk sits with a service providernot OnPay
- A growing company that wants payroll, benefits enrolment and a retirement plan administered together rather than through three vendorsnot OnPay
- A small employer seeking benefits pricing through a professional employer organisation that it could not negotiate on its own headcountnot OnPay
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
OnPay
- OnPay operates only in the United States, so the first international hire means a second payroll vendor and a separate compliance model.
- There is no native mobile application, only a responsive web interface, which employers with field or shift-based staff notice immediately.
- The HR functionality is administrative and does not replace an HRIS, so performance, learning and any real workflow automation need another product.
- Time and attendance is handled through integrations rather than natively, meaning hours arrive from a third-party system that has to be reconciled when it disagrees with payroll.
- Reporting is functional but limited, and companies that want cost analysis by department, project or location generally export to a spreadsheet rather than build it in the product.
Paychex
- Pricing is quoted rather than published and varies between clients and between renewals, with separate charges for each payroll run, off cycle payments and year end processing, so two similar businesses regularly pay very different amounts for the same service and comparing quotes is difficult by design.
- Charging per payroll run rather than per month penalises employers who pay weekly or who run frequent off cycles, so a business with hourly staff on a weekly cycle pays several times what a monthly salaried business of the same size pays.
- Migrating mid year requires transferring year to date wage and tax figures for every employee in every jurisdiction, so in practice companies switch only at a calendar year end, which leaves you locked to the incumbent for the rest of the year whatever the service is like.
- The service model depends on an assigned representative, and reported experience varies sharply with who that person is and how often the assignment changes, which means the quality of what you bought is not a property of the product you evaluated.
- It is a United States service, so a company with employees abroad still needs a separate payroll provider in each country, and the group has no single view of employment cost without building one outside the system.
Pricing, plan by plan
OnPay
On request- OnPay$undefined/month
- One published plan combining a flat monthly base fee with a per person charge
- No feature tiers, upgrades or add-on modules
- Unlimited pay runs and multi-state filing included
Paychex
$29/month- Flex Essentials$39/month
- Payroll
- Tax administration
- Direct deposit
- Flex Select$59/month
- HR administration
- State unemployment insurance
- New hire reporting
Which should you pick?
Choose Paychex if
- You need payroll processing.
- You work on Web, Ios, Android.
- You also want payroll tax filing.
Questions people ask
- Is OnPay or Paychex better?
- Neither clearly leads. OnPay starts at On request and Paychex at $29/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, OnPay or Paychex?
- OnPay starts at On request and Paychex at $29/month.
- Does OnPay or Paychex run on more platforms?
- OnPay runs on Web. Paychex runs on Web, Ios, Android.
- What is OnPay best used for?
- OnPay is most often used for a farm running agricultural payroll that needs form 943 rather than the standard quarterly filing, a church or nonprofit with clergy compensation rules that mainstream providers decline to handle, a restaurant group needing tip credit and minimum wage make-up calculated correctly each pay period, a small business that wants one price for payroll rather than a tiered plan it has to keep upgrading. Of those, a farm running agricultural payroll that needs form 943 rather than the standard quarterly filing and a church or nonprofit with clergy compensation rules that mainstream providers decline to handle are not what Paychex is typically brought in for.
- What can OnPay do that Paychex cannot?
- OnPay covers Single plan, Tax filing and payment, Vertical payroll support, Benefits brokerage. Paychex covers Payroll processing, Payroll tax filing, Year end forms, Multi state payroll. Both handle Workers compensation.
Answered from the vendors’ own pages
OnPay: How is OnPay priced?
As a single published plan with a flat monthly base fee plus a charge per person paid, with no feature tiers. Contractors are charged at the same per person rate as employees.
Paychex: How much does it cost?
Paychex quotes per client rather than publishing rates, and the structure typically includes a base fee plus a per employee per payroll charge with extras for year end and off cycle runs. Get the full fee schedule in writing, including what a mid year change of plan costs.
OnPay: Does it handle payroll outside the United States?
No. It is US-only, in all fifty states, including multi-state filing at no extra cost.
Paychex: Who is liable if payroll taxes are filed late or wrongly?
Contractually the provider generally accepts responsibility for errors it makes, but the employer remains the party the tax authorities pursue. Read the specific indemnity language rather than relying on the sales description.
OnPay: Why do farms and churches use it?
It supports Form 943 agricultural filing, clergy housing allowance and Social Security exemption rules, and 501(c)(3) nonprofit payroll, which several larger providers do not.
Paychex: Can I switch providers mid year?
Technically yes, but you must carry year to date figures across for every employee and jurisdiction, and errors there surface at year end on employee tax forms. Most businesses switch effective 1 January for that reason.
OnPay: Is there a mobile app?
No. Employers and employees use a responsive web interface, which is a genuine gap for shift-based workforces.
Paychex: What is the difference between the standard service and the professional employer organisation option?
Under the professional employer organisation arrangement Paychex becomes a co-employer for tax and benefits purposes, which changes your benefits access and some of your employment administration. It costs more and it is harder to unwind, so treat it as a different decision from buying payroll.
Paychex: Does it work with my accounting software?
It exports a general ledger file and connects to the mainstream accounting products. Confirm the mapping to your chart of accounts during onboarding, because a generic export means your bookkeeper recodes every run.
Paychex: Is it suitable if we only have a few employees?
It will serve you, but very small employers often find the per run charges and the service tiering expensive relative to self service payroll products. The case improves once multi state complexity or benefits administration enters the picture.
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