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When it comes to the best accounting firms, the "Big Four" consistently rank at the top globally. For accounting software, several brands are widely used, catering to various business sizes and needs.

Top Accounting Firms

The four largest professional services networks, often referred to as the "Big Four," dominate the accounting industry and are recognized for their extensive services in audit, tax, and consulting:

• Deloitte is the largest accounting firm in the U.S. and globally, known for its services across audit, tax, consulting, financial advisory, and risk management. It serves major corporations like Apple, Google, and Bank of America.
• PwC (PricewaterhouseCoopers) is widely regarded as one of the world's most prestigious and progressive accounting firms, consistently ranking high in prestige surveys.
• EY (Ernst & Young) is another global leader offering audit, tax, financial services, and consulting.
• KPMG is highly valued and recognized for its global strength, inclusive team environment, and flexible work policies.

Beyond the Big Four, other highly-regarded firms include:

• BDO USA
• RSM US
• Moss Adams
• Plante Moran
• Baker Tilly
• Grant Thornton
• CohnReznick
• PKF O'Connor Davies

These firms are often ranked based on surveys of accounting professionals, considering factors like prestige, business outlook, compensation, culture, and work/life balance.

Top Accounting Software and Products

The best accounting software often depends on the size and specific needs of a business:

For Small Businesses and Freelancers:

• Intuit QuickBooks Online is a widely used and highly popular choice for small businesses due to its intuitive interface, easy data entry, and ability to handle various functions like organizing expenses, taxes, and sales. QuickBooks Simple Start is specifically recommended for freelancers and sole proprietors.
• FreshBooks is often highlighted for its ease of use, particularly beneficial for service-based businesses.
• Wave is a popular option, especially for microbusinesses needing basic accounting, invoicing, and receipt scanning, with its core accounting features often being free.
• Xero is a cloud-based accounting solution popular among small businesses, known for its robust payment management and collection tools.
• Zoho Books is recognized for its affordability and feature-rich accounting applications.

For Mid-sized to Enterprise Businesses:

• Sage Intacct is a cloud-based financial management software designed for mid-sized and larger businesses with complex accounting requirements, offering strong customization and integration capabilities.
• NetSuite by Oracle is a comprehensive platform suitable for mid-sized companies anticipating significant growth or with complex operations, offering extensive scalability and customization. It can manage an entire business beyond just finance.
• SAP Cloud ERP (SAP S/4HANA Cloud) is another top player in enterprise accounting software.

If you mean the most widely used and most reputable accounting firms, the safest answer is the Big Four: Deloitte, PwC, EY, and KPMG. If you mean firms people rank highly as employers and overall brands, PwC, EY, KPMG, Plante Moran, and BDO consistently appear near the top in recent rankings.

The strongest “top brand” choices by common use and market presence are:

• Deloitte — largest by revenue in the sources provided and ranked #1 on IPA’s Top 500 CPA firms.
• PwC — #2 by revenue in IPA, and ranked #1 in Vault’s 2026 prestige ranking and best-to-work-for ranking.
• EY — #3 by revenue in IPA and consistently ranked among the top global firms.
• KPMG — one of the Big Four and consistently top-ranked across the provided lists.
• RSM US LLP — a major national firm that appears in both prestige and top-firm rankings.
• BDO USA — another widely used large firm that repeatedly shows up in top rankings.
• Baker Tilly — frequently ranked among the leading non-Big Four firms.

If you want a practical shortlist, I’d break it down this way:

One important nuance: “best” depends on what you need. The Big Four dominate for multinational audits, complex tax, and large consulting work, while firms like Plante Moran, Baker Tilly, RSM, and BDO are often strong choices for mid-market businesses and individuals who want a major