Clients constantly ask “which payroll service should I use?” The answer depends on their size, complexity, and what else they need beyond payroll. Here’s the comparison from an accountant’s perspective.

Quick Comparison

Feature	Gusto	ADP Run	Paychex Flex
Best for	Small businesses (1-100)	Growing businesses (10-500)	Mid-size businesses (25-1,000)
Ease of use	✅ Excellent	⚠️ Moderate	⚠️ Moderate
QBO integration	✅ Seamless	✅ Good	✅ Good
Xero integration	✅ Good	⚠️ Basic	⚠️ Basic
Benefits admin	✅ Built-in	✅ Built-in	✅ Built-in
HR features	✅ Good	✅ Extensive	✅ Extensive
AI features	⚠️ Basic	✅ Good	⚠️ Basic
Multi-state	✅ Included	✅ Included	✅ Included
Accountant portal	✅ Excellent	✅ Good	⚠️ Decent
Price	From $40/mo + $6/ee	Custom (~$50-150/mo)	Custom (~$60-150/mo)

Gusto — Best for Small Businesses

Gusto is the easiest payroll platform to set up and use. The interface is clean, the onboarding is guided, and the accountant portal is the best in the industry. For small businesses with straightforward payroll needs, Gusto is the default recommendation.

Why accountants love it: The accountant dashboard lets you manage all your clients’ payroll from one place. The QBO integration is seamless — payroll journal entries post automatically with the correct mapping.

Limitations: Limited HR features compared to ADP and Paychex. No time clock hardware. Benefits options are more limited in some states.

ADP Run — Best for Growing Businesses

ADP is the 800-pound gorilla of payroll. ADP Run is their small business product, and it’s solid — more features than Gusto, better HR capabilities, and the backing of the largest payroll company in the world.

Why accountants recommend it: For clients who are growing and will eventually need more sophisticated HR features (performance management, learning management, advanced reporting), ADP grows with them. No need to switch platforms later.

Limitations: More complex than Gusto. The interface isn’t as intuitive. Pricing is opaque — you have to call for a quote, and the sales process can be aggressive.

Paychex Flex — Best for Mid-Size Businesses

Paychex targets the mid-market with a comprehensive platform that includes payroll, HR, benefits, retirement plans, and insurance. It’s the most full-featured option for businesses that want everything from one provider.

Why accountants recommend it: For clients with 25+ employees who need retirement plan administration, workers’ comp, and comprehensive HR — Paychex bundles it all. The compliance support is strong.

Limitations: The accountant portal is less polished than Gusto’s. The interface can feel dated. Pricing is the highest of the three for small businesses.

What to Recommend

Client Situation	Recommend
1-25 employees, simple needs	Gusto
10-100 employees, growing fast	ADP Run
25-500 employees, need full HR	Paychex Flex
Tech company, wants modern UX	Gusto or Rippling
Price-sensitive, basic needs	Gusto Simple ($40/mo)

The most important factor isn’t features — it’s whether the platform integrates cleanly with your accounting software. A payroll platform that requires manual journal entries creates more work than it saves.

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