An independent cybersecurity review across the largest payroll providers in the United States — national payroll, HR, and workforce-management platforms processing wages for millions of employees including ADP, Paychex, and Gusto — reveals a surprisingly wide range of results. These organizations handle sensitive customer and financial data at national scale, yet several show the same email-authentication gaps found at much smaller regional institutions.
Using data from audit.emailmenow.com, we evaluated each provider’s primary domain across email, website, and network security — including SPF, DKIM, DMARC, MTA-STS/TLS, and security headers.
In this national audit, scores ranged from 80% to 51% — 4 of 18 (22%) scored below 60%.
Cybersecurity Scores of Payroll Providers
Overall compliance scores from audit.emailmenow.com. Re-run any domain at the link to verify.
| Rank | Payroll Provider | Domain | Overall Score | Performance Level |
|---|---|---|---|---|
| 1 | Gusto | gusto.com | 80% | Strong |
| 2 | TriNet | trinet.com | 71% | Strong |
| 3 | ADP | adp.com | 70% | Strong |
| 3 | Paycom | paycom.com | 70% | Strong |
| 3 | Intuit Payroll | intuit.com | 70% | Strong |
| 6 | Zenefits | zenefits.com | 66% | Good |
| 7 | Paylocity | paylocity.com | 64% | Above Average |
| 7 | UKG | ukg.com | 64% | Above Average |
| 9 | Paycor | paycor.com | 60% | Above Average |
| 9 | Insperity | insperity.com | 60% | Above Average |
| 9 | Rippling | rippling.com | 60% | Above Average |
| 9 | Ceridian Dayforce | ceridian.com | 60% | Above Average |
| 9 | Workday | workday.com | 60% | Above Average |
| 9 | Square Payroll | squareup.com | 60% | Above Average |
| 15 | Paychex | paychex.com | 58% | Average |
| 15 | Namely | namely.com | 58% | Average |
| 17 | BambooHR | bamboohr.com | 52% | Below Average |
| 18 | SAP | sap.com | 51% | Below Average |
What the Results Reveal
- Scores range from 80% (Gusto) down to 51% (SAP) — Gusto (80%) leads the field, well ahead of legacy incumbents.
- ADP (70%) and Paycom (70%) reach a strong posture, while Paychex (58%) and SAP (51%) trail mid-market SaaS competitors.
- The gap from top to bottom is 29 points — market share alone does not predict payroll-security hygiene.
- Without an enforced DMARC policy, criminals can spoof a payroll vendor’s domain to redirect direct deposits or harvest W-2 data.
Why This Matters for Payroll Providers
Payroll providers are bound by GLBA-style safeguards, IRS e-file security requirements, and contractual obligations to protect employee PII and bank accounts. Email authentication (SPF, DKIM, and an enforced DMARC policy) is the single highest-impact control against payroll diversion, W-2 phishing, and business email compromise targeting ACH updates.
Check any provider’s posture at audit.emailmenow.com/?industry=payroll-providers.
See also — state audits
- Texas Accounting Firms
- California Accounting Firms
- Florida Accounting Firms
- Illinois Accounting Firms
- New York Accounting Firms
- Pennsylvania Accounting Firms
- Ohio Accounting Firms
- Georgia Accounting Firms
- Michigan Accounting Firms
See also — related national audits
Recommendations
- Enforce DMARC (
p=reject), strict SPF (-all), and DKIM signing. - Add MTA-STS and website security headers.
- Adopt verified call-back procedures for any change to payment or wiring instructions, and train customer-facing staff.
Protect your organization. Run a free Instant Cybersecurity Audit at audit.emailmenow.com/?industry=payroll-providers.
Contact EmailMeNow IT Consulting for help with payroll-security email hardening.
Source & methodology: Overall compliance scores from the free scan at audit.emailmenow.com — each domain checked for email authentication (SPF, DKIM, DMARC), transport security (MTA-STS/TLS), website security headers, and network security. Re-run any domain at the link to verify.