Introduction
The demand for accounting outsourcing services in the USA has been growing quickly as businesses seek cost efficiency, accuracy, and qualified financial talent without increasing in-house overhead. According to recent industry trends, more than 60% of U.S. small and mid-sized businesses outsource some aspect of their accounting, including bookkeeping, payroll processing, tax preparation, AR/AP management, and virtual CFO services.
With rising labor costs, staffing shortages, and increasing compliance requirements from the IRS, GAAP standards, and state tax authorities, companies are turning to top outsourcing partners who can deliver:
- High-quality accounting support
- Scalable staffing solutions
- Technology-powered processes using QuickBooks, Xero, NetSuite, Zoho, Sage
- End-to-end financial reporting & tax compliance
In this article, we’ve compiled a list of the Top 10 Accounting Outsourcing Firms in the USA that businesses can consider. Whether you’re handling day-to-day bookkeeping or managing complex financial operations, these firms help organize your accounting efforts without the stress of doing everything in-house.
1. Countsure – Best Accounting Outsourcing Firm for U.S. SMBs & CPA Firms
Countsure, is growing as one of the most reliable accounting outsourcing firms in the USA for small businesses, startups, and CPA firms. With a strong focus on accuracy, compliance, and long-term client relationships, Countsure offers an excellent balance between cost-effectiveness and high-quality financial expertise.
Key Services Offered by Countsure
Countsure provides full-cycle outsourced accounting services, including:
- Bookkeeping Services (Daily, Weekly, Monthly)
- Accounts Payable & Accounts Receivable Management
- Bank & Credit Card Reconciliation
- Payroll Processing (U.S. Compliant)
- Tax Preparation & Tax Filing Support (Individual & Business Returns)
- Sales Tax Compliance
- Financial Reporting (P&L, Balance Sheet, Cash Flow)
- Virtual CFO Services for Growth-Stage Businesses
- Catch-Up Accounting & Cleanup Projects
What Makes Countsure Stand Out?
Countsure provides a high trust outsourcing model focusing on:
- U.S. GAAP-Compliant Accounting
- Real-time financial checkpoints
- Dedicated accountants for every client
- Affordable pricing compared to U.S. in-house staff
- Fast onboarding and flexible engagement models
- Strict data security protocols & secure file-sharing systems
Best For:
- Small & mid-sized U.S. businesses
- CPA firms needing seasonal staffing
- Companies looking for cost-effective full-service accounting
2. Deloitte
Best for: Large enterprises need technology-driven, enterprise-level accounting outsourcing and compliance support.
Deloitte provides complete finance and accounting outsourcing supported by automation, analytics, and global delivery centers. Their services are ideal for corporations with complex financial operations.
Key differentiators of Deloitte
- Industry-leading automation & AI-driven finance processes
- Global shared service centers for scalable accounting
- Strong focus on regulatory compliance and audit-ready reporting
- Deep expertise in ERP systems (SAP, Oracle, NetSuite)
3. KPMG
Best for: Companies seeking risk-controlled, compliance-heavy accounting outsourcing with strong audit support.
KPMG offers managed accounting services driven by strong regulatory experience. Their solutions help businesses maintain accuracy in financial reporting and internal controls.
Key differentiators of KPMG
- Compliance-focused accounting frameworks
- Specialized support for US GAAP, IFRS & tax regulations
- Integrated risk and internal controls outsourcing
- Advisory-backed financial reporting solutions
4. PwC (PricewaterhouseCoopers)
Best for: Mid-sized to large organizations undergoing digital finance transformation and cloud migration.
PwC delivers advanced accounting outsourcing solutions blending technology, automation, and expert advisory. Their approach supports businesses aiming to modernize their finance operations.
Key differentiators of PwC
- Integrated finance transformation services
- Strong ERP and cloud accounting capabilities
- High-level tax, audit, and reporting expertise
- Global networks ensuring rapid multi-country support
5. EY (Ernst & Young)
Best for: Businesses need professional tax outsourcing and finance co-sourcing with global compliance.
EY’s Tax & Finance Outsourcing (TFO) framework helps companies streamline tax filings, accounting operations, and financial reporting with secure, scalable systems.
Key differentiators of EY
- Advanced global tax outsourcing capabilities
- Secure cloud-based financial platforms
- End-to-end finance co-sourcing models
- Strong expertise in multi-state and international compliance
6. Grant Thornton
Best for: Mid-market U.S. companies looking for flexible, high-quality outsourced accounting and advisory support.
Grant Thornton offers a balanced approach between personalization and enterprise-grade capability, making them ideal for growing businesses.
Key differentiators of Grant Thornton
- Customizable outsourced bookkeeping & controller services
- Strong expertise in tax and audit assistance
- Automated financial reporting systems
- Industry-specific accounting support
7. Infinity Globus
Best for: Small and mid-sized CPA firms requiring dedicated teams and flexible models.
Infinity Globus provides tax and accounting for CPAs and accounting outsourcing firms. Their services are designed to help smaller firms scale efficiently.
Key differentiators of Infinity Globus
- CPA- and EA-centric operations
- Strategic global delivery alliances
- Seamless QuickBooks/Xero integration
- Full-spectrum accounting services
8. IBM
Best for: Large enterprises need automation-first, AI-powered accounting operations.
IBM brings world-class technology capabilities to the finance outsourcing domain, providing digital accounting models that reduce manual work and improve accuracy.
Key differentiators of IBM
- AI-driven bookkeeping & AP/AR automation
- Advanced analytics and financial dashboards
- Global delivery centers for high-volume accounting
- Strong integration with enterprise systems
9. Genpact
Best for: Companies need scalable, end-to-end finance and accounting BPO services.
Genpact supports businesses with large or complex accounting requirements using digital workflows, automation, and global process optimization.
Key differentiators of Genpact
- Full-cycle F&A outsourcing (AP, AR, GL, FP&A)
- AI and machine-learning-enabled processes
- Strong focus on operational efficiency and accuracy
- Global presence with U.S.-aligned delivery centers
10. Infosys BPM
Best for: Businesses seeking cost-effective, technology-enabled accounting outsourcing with strong offshore support.
Infosys BPM combines automation, cloud accounting, and financial analysis to deliver scalable and affordable accounting services.
Key differentiators of Infosys BPM
- End-to-end bookkeeping & financial processing
- Innovative automation & workflow tools
- Global shared service centers for cost efficiency
- Strong multi-industry accounting capabilities
Conclusion
Outsourcing accounting has become a practical solution for businesses aiming to reduce costs, improve accuracy, and stay compliant with evolving financial regulations. The firms listed above offer reliable options based on different business needs – from small companies to large enterprises. For U.S. SMBs and CPA firms seeking a balanced mix of quality, affordability, and dedicated support, Countsure serves as a strong and dependable choice. With the right outsourcing partner, managing your finances becomes easier, faster, and stress-free.
FAQs
Accounting outsourcing is when a business hires an external firm to manage tasks like bookkeeping, payroll, tax filing, and financial reporting instead of handling them in-house.
Companies outsource to save costs, improve accuracy, access skilled accountants, and stay compliant with IRS and GAAP requirements.
Yes. Outsourcing typically costs 50–70% less than hiring full-time in-house staff while maintaining high-quality financial support.
Small businesses, startups, e-commerce brands, and CPA firms benefit the most due to high workloads and limited internal resources.
Reputable firms use encrypted systems, NDAs, secure file-sharing, and strict data protection policies to keep financial information safe.
Yes. Most outsourcing firms specialize in platforms like QuickBooks, Xero, NetSuite, Zoho, and Sage.
Check their experience, pricing, technology expertise, data security, and whether they offer services suited to your business size.
Parth Shah, Managing Director
(CPA-US, FCA, RV-S&FA, DISA)
Parth Shah who is head of Accounts and Book keeping has experience of more than 10 years. A Certified Public Accountant – US, fellow Chartered Accountant, Registered Valuer and Diploma in Information System Audit.
