ADP and Paychex are the two oldest names in US payroll, and both sell a small-business product alongside their large-employer platforms. This comparison uses only what each company publishes on its own website, read on 4 October 2026. It doesn't rate them: we haven't run payroll on either, and anything presented as a test would be invented.
Side by side
| RUN Powered by ADP | Paychex Flex Essentials | |
|---|---|---|
| Packages shown | Essential Payroll, Enhanced Payroll, Complete Payroll & HR Plus, HR Pro Payroll & HR | Essentials, the plan sold in the online store |
| Published price | None on the packages page: "Get a quote" or "Get pricing" | $44.00 listed in Paychex's online store |
| Extra fees mentioned | W-2 and 1099 forms: "additional fee" | "Additional fees may apply", shown in the service agreement |
| Payroll tax filing | Calculates, files, deposits and reconciles payroll taxes | Federal, state and identified local payroll taxes calculated, paid and filed |
| W-2s and 1099s | Created, delivered and e-filed (additional fee) | Automatic W-2s and 1099s |
| Payroll runs | Online, mobile app or by phone | Unlimited payrolls online, mobile app |
| New-hire reporting | Included in every package | Not listed on the Essentials page |
| HR support | HR HelpDesk in the two HR packages, not Essential or Enhanced | HR library and business forms |
| How you sign up | Sales quote | Online, about 5 to 10 minutes; pay nothing until the first payroll |
Checked October 4, 2026. From adp.com (RUN payroll packages page) and get.paychex.com (Paychex Flex Essentials). Prices change; check both pages before you decide.
Where they differ in practice
Price transparency is the clearest difference. Paychex lets you see a figure and sign up for its entry plan online. ADP's packages page compares features in detail but sends you to a sales quote for the price, so you can only compare like for like after talking to both.
Package design is the second. ADP lays out four packages with a long feature grid: garnishment payment service, state unemployment insurance management and labor law posters come in from Enhanced upward; an HR helpdesk, handbook wizard and training from the HR packages. Paychex's online Essentials plan lists unlimited payrolls, direct deposit, tax administration, W-2s and 1099s, reporting, a mobile app and employee self-service.
Both flag fees beyond the headline. ADP marks W-2 and 1099 forms as an additional fee; Paychex says additional fees may apply and shows them in the service agreement. Ask for the full yearly cost, including year-end forms, before signing either.
Questions to ask both before you sign
- What is the total monthly cost for my number of employees, including per-employee fees?
- What do year-end W-2s and 1099s cost, and is filing them with the SSA and IRS included?
- Is there a setup fee, a minimum term or a cancellation fee?
- Are state unemployment filings and new-hire reporting included for my state?
- What happens if I run payroll less often, or skip a month?
- Who pays a penalty caused by a filing error on your side?
Timing matters if you are switching from another provider or from doing it yourself. Starting at the beginning of a calendar quarter, or better a calendar year, keeps each quarterly federal return (Form 941) and state return with one filer. A mid-quarter switch means the new provider needs your year-to-date figures for every employee, and you should confirm in writing which of you files the returns for the quarter you switch in.
When you need neither
Full-service payroll earns its fee when you have several employees, several states or no wish to touch a tax form. It is a lot of service for one or two people on a fixed schedule. Three situations where small employers often skip ADP and Paychex:
- One household employee, such as a nanny or caregiver. The family pays the federal taxes once a year on Schedule H with its own return, and the state filings are small.
- A company paying only its owner a regular salary, where an accountant already handles the filings.
- Two or three staff on steady pay, where a lower-cost payroll app with published pricing (Gusto, Square Payroll, Patriot and QuickBooks all list prices) covers the filings for less.
If you run payroll yourself, you still need to work out each paycheck, make the tax deposits and filings, and hand each employee a pay stub. The IRS's Publication 15 (Employer's Tax Guide) sets out the federal side: for 2026, Social Security is 6.2% each for employer and employee on wages up to $184,500, and Medicare is 1.45% each with no wage limit.
Where PayDocs fits
PayDocs isn't payroll software and doesn't compete with ADP or Paychex on filing. It covers one piece of do-it-yourself payroll: the documents. You enter the pay period's figures and it produces a pay stub PDF, or W-2 and 1099 recipient copies at year end. PayDocs works out federal income tax, Social Security, Medicare and supported state taxes for 2026 pay dates (see what we calculate). Preview is free; you pay per document, with no subscription.
PayDocs doesn't deposit or file payroll taxes, report new hires or file W-2s with the SSA. If you want someone else to do those things, a full-service provider is the right choice.
Questions
Is ADP or Paychex cheaper for a small business?
It can't be answered from their websites alone. ADP doesn't publish prices on its RUN packages page, and Paychex lists Flex Essentials at $44.00 with additional fees possible. Get a written quote from both for your headcount.
Do ADP and Paychex both file payroll taxes?
Yes. Both say they calculate, pay and file payroll taxes on their small-business plans and produce W-2s and 1099s, which ADP lists as an additional fee.
Do I need ADP or Paychex for one employee?
Not necessarily. Household employers and very small businesses often run payroll themselves or use a lower-cost app with published pricing. The filings still have to be done by someone.
Sources
- ADP: RUN Powered by ADP payroll packages (checked 4 October 2026)
- Paychex: Paychex Flex Essentials online store listing (checked 4 October 2026)
- Paychex: Paychex Flex Essentials plan page (checked 4 October 2026)
- IRS: Publication 15 (2026), Employer's Tax Guide
- IRS: Publication 926 (2026), Household Employer's Tax Guide
Sources checked October 4, 2026. This article explains how pay documents work; it is not tax or legal advice.
