Extreme logo

Extreme

by Microsoft
No reviews yet
ActiveAvailable globallyCloudOn-premise
Quick facts
VendorMicrosoft
Year launched
StatusActive
LocationOne Microsoft Way, Redmond, WA 98052, United States
Countries servedGlobal
Languages13
Integrations3+
Free tierNO
Free trialNO
Contact salesYES
Last reviewed: Jun 2026

About Extreme

Extreme is an on-premise payroll, HR, and accounting software suite designed for the PEO and ASO industries. It provides tools for back-office administration, tax withholding, benefits enrollment, and client billing within a single environment.

Extreme by Accountix is a specialized, on-premise software suite built specifically for the PEO and ASO industries. It serves as a comprehensive back-office platform that integrates payroll, HR administration, and accounting into a single SQL-based environment. The system is designed to handle the complex requirements of professional employer organizations, offering features like automated tax withholding, flexible client billing, and robust reporting. The platform includes a web portal that allows clients and employees to perform self-service tasks such as onboarding, benefit enrollment, and pay stub retrieval. While the software is primarily an on-premise Windows-based solution, it provides the scalability needed to process large volumes of payroll. Accountix supports the product with dedicated technical assistance and a long history of industry-specific development, making it a reliable choice for firms that require deep integration between their financial and administrative workflows.

Pros & Cons

What users like
  • +Integrates payroll, HR, and accounting into a single software environment.
  • +Provides flexible billing options tailored for PEO and ASO business models.
  • +Includes a robust self-service web portal for clients and employees.
  • +Supports complex payroll processing and tax withholding requirements.
  • +Offers specialized features for temp staffing and union assignments.
What users flag
  • Requires on-premise Windows-based installation or private cloud hosting.
  • Pricing structure is not publicly disclosed and requires contact with sales.
  • Limited to the PEO and ASO industry niche.

Features

Key features

Payroll Processing
Automates complex payroll calculations and tax withholdings for PEO and ASO clients.
Client Billing
Offers flexible billing structures with multiple fee types and tax customizations.
Employee Web Portal
Provides self-service access for employees to view pay stubs, W2s, and benefit elections.
Benefits Administration
Integrated tool for managing employee benefit plans and dependent coverage.
Onboarding Management
Streamlines the collection of new employee information and company document distribution.

Additional features

General Ledger Integration
Automatically posts all payroll and administrative transactions to the general ledger.
Accounts Payable and Receivable
Includes built-in tools for managing agency administration, AP, and AR.
Document Storage
Allows secure uploading and retrieval of documents through the web portal.
Temp Staffing Support
Provides daily hour entry, union assignment, and job costing for temporary employees.
Reporting and Analytics
Delivers a comprehensive set of tools for generating business and client reports.
Tax Compliance
Automates tax withholding and agency administration tasks.
Database Management
Utilizes Microsoft SQL Server for robust data storage and retrieval.

Pricing

Free trial
Free version
Request a quote
Promo Offer

Countries & Languages

Global
Countries served
13
Interface languages
10
Billing currencies

Interface languages

EnglishSpanishFrenchGermanItalianPortugueseDutchRussianChineseJapaneseKoreanArabicTurkish.

Billing currencies

🇺🇸USD🇪🇺EUR🇬🇧GBP🇯🇵JPY🇦🇺AUD🇨🇦CAD🇨🇳CNY🇮🇳INR🇷🇺RUB🇧🇷BRL

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