The best payroll integration for America’s Best 401(k)

OnPay’s payroll and HR software integrates with AB401k to deliver an easy 401(k) experience. We take care of all the calculations for deductions, tax filings, and payments so you can relax knowing everything’s done right.

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  1. OnPay
  2. Payroll Software
  3. Integrations
  4. America’s Best 401(k)

PAYROLL + 401(K)

Sync payroll with a great retirement plan

OnPay’s integration with AB401k eliminates the need for manual calculations. With automated plan administration, you can leave the deductions and withholdings to us. Our team of experts will do the work to set you up with our integrated payroll software ⁠— including migrating all of your data and prior wages.


Leave the hard stuff to the pros

In addition to integrating with OnPay, AB401k handles everything from plan design and compliance testing to reporting and employee communications. You can leave all the plan administration to their experts.


Low fee (and no middlemen)

AB401k offers a simple, transparent fee structure that fits on one page. Everything – from the cost of investments to comprehensive personal service – is included, and it’s guaranteed your fees will never increase.


Take care of other back office tasks, too

Simplify HR to-dos

Stay organized and keep complaint with OnPay's built-in HR. New employees can self-onboard, and we'll store your HR files, keep track of PTO, and handle all the new hire reporting.

Keep all of your data in one place

Avoid mistakes (and repetitive tasks) with our best-in-class integrations with QuickBooks, Xero, and time tracking software. All of your data will update automatically every time you run payroll.

Make team management easy

Manage and monitor your team’s productivity with customizable tasks and checklists. You can delegate and track things like orientation training, computer setup, and other common tasks.

See all features


Loved by small businesses

“OnPay was easy to set up and even easier to use. I can process payroll in minutes, and the automated 401(k) processing is a big time saver.”


– Coulomb Solutions Inc.


$40 + $6 per active employee

It’s one simple monthly price for everything.

  • Unlimited monthly pay runs
  • No integration fee for America’s Best 401(k)
  • Process payroll anywhere, on any schedule
  • Free migration of employee and wage data
  • Expert support by phone, chat, and email


Get started with OnPay

  1. Set up your accounts in minutes
  2. Add your employee data (or we’ll do it for free)
  3. Run payroll — we’ll handle your taxes and forms
  4. We’ll sync with AB401k to automate everything

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