Paychex vs ADP in 2026

Verdict

Pick Paychex Flex if a benefits broker, 401(k), workers’ comp policy, or CPA is already standardized on Paychex and the written quote is the cheaper relationship after year two. Pick ADP RUN if a lender, PEO conversation, or the same CPA already lives in ADP and you have the same written math. Do not pick either because a board member “has always used them.” Do not pick either to impersonate a 400-person HCM without a quote.

This is not Gusto vs Paychex or Gusto vs ADP RUN — those pages exist. This page is the two quote shops against each other. If you do not have two written numbers, you do not have a comparison. That is the whole method. OnPay and Square Payroll are published alternatives if the register or multi-state SKU is the job.

Public pricing as of September 20, 2026

Paychex Flex: not published as a national self-serve rate card. Packages are typically Flex Select, Pro, and Enterprise, sold through a conversation. Third-party 2026 call quotes circulate. We do not treat those as official. Request a written quote that includes PEPM, base, implementation, year-end, and any 401(k) or workers’ comp add-ons.

ADP RUN: not published as a national self-serve rate card. Packages are Essential, Enhanced, Complete, and HR Pro. ADP asks you to request pricing. Third-party blogs circulate estimates; we do not treat those as official. Get implementation and year-two fees in writing.

The published third fork — so you have a number to beat: Gusto Simple $49 + $6 per person, Plus $80 + $12, Premium $180 + $22, Contractor Only $35 + $6. Ten people, one state, Gusto Simple is $109/month. Confirm gusto.com/product/pricing.

• If Paychex’s written total is under Gusto Plus and you already have the 401(k) there, Paychex can win.
• If ADP’s written total is under Gusto Plus and the broker will not move, ADP can win.
• If neither quote includes implementation and year-end, you are shopping a teaser.
• If you cannot get a quote this week, start Gusto and revisit.

Two relationship products

Paychex sells a local-ish relationship: a contact, a retirement plan already in-family, workers’ comp that only pencils if payroll stays. ADP sells the brand boards already know and a path into broader HCM if you grow into it. Neither is a Tuesday-night self-serve desk in the Gusto sense. Both will file garnishments and SUI — the unglamorous work their brands exist for.

Rippling is the third fork if IT and HR report to the same founder — see Rippling vs Gusto, not this page. Square Payroll is the fork if the register is Square. OnPay is the fork if you want a published multi-state SKU at $49 + $6.

Who should pick which

• CPA or broker already on Paychex, quote in writing: Paychex.
• Lender or broker already on ADP, quote in writing: ADP RUN.
• First hire, one state, want a napkin: Gusto Simple — leave this page.
• Already on Square POS: Square Payroll may beat both quotes. See Gusto vs Square Payroll.
• You need a PEO: Justworks or an ADP/Paychex PEO conversation, not RUN vs Flex as software.
• IT is the fire: Rippling quote, not this fork.

We are not your benefits broker. Multi-state nexus belongs to a professional.