SAP S/4HANA

When people ask about the “best” accounting firms, the answer depends on whether you mean professional accounting/audit firms or accounting software products. Here’s a practical breakdown of both.

🏢 Top Accounting Firms (Professional Services)

The “Big 4” – best for large corporations, global audits, and complex tax

1. Deloitte – World’s largest by revenue; strong in audit, consulting, and tax.
2. PwC (PricewaterhouseCoopers) – Considered the most prestigious for audit and assurance.
3. EY (Ernst & Young) – Huge in tax, advisory, and transaction services.
4. KPMG – Major player in audit, tax, and advisory, especially with large enterprises.

Best for: Public companies, multinationals, high-net-worth individuals, IPO prep, complex cross-border tax.

Mid-tier / Large regional firms – great for mid-sized businesses

5. BDO – Strong global network, more personal service than Big 4.
6. RSM – Focuses on middle-market companies.
7. Grant Thornton – Good for growing businesses and private equity-backed companies.
8. Moss Adams (US West) – Great for mid-market and niche industries.

Best for: Companies that have outgrown small local CPAs but don’t need Big 4 complexity.

Small local CPA firms / independent CPAs

• Best if you need basic bookkeeping, tax prep, payroll, or small business advisory.
• Look for QuickBooks ProAdvisors or Xero-certified accountants if you use those tools.

💻 Top Accounting Software / Products (What People Actually Use)

Best for Small Businesses & Self-Employed

• QuickBooks Online – The most widely used. Awesome for invoicing, expense tracking, taxes, and integrations.
• Xero – Best if you want a clean, modern interface. Popular with freelancers and small businesses, especially outside the US.
• FreshBooks – Super easy for service-based businesses and freelancers; great invoicing and time tracking.

Best for Growing Mid-Size Companies

• NetSuite (Oracle) – Heavy-duty ERP with strong accounting; used by companies with inventory, subsidiaries, or complex revenue.
• Sage Intacct – Excellent for finance teams, multi-entity accounting, and automation.
• Zoho Books – Affordable, good for small businesses that already use Zoho CRM.

Best for Enterprise / Complex Accounting

• SAP S/4HANA – Big enterprise financials; used by huge global companies.
• Oracle Financials Cloud – Competitor to SAP, strong for large organizations.

Best for Bookkeeping Automation

• QuickBooks Live (they do your bookkeeping)
• Bench (outsourced bookkeeping + software)
• Keeper (automated tax + bookkeeping for freelancers)

Quick Recommendation

Bottom line: For software, QuickBooks Online is the default choice for most small businesses. For professional services, Big 4 dominates the top tier, but BDO/RSM/Grant Thornton often give better service for mid-market companies at a lower price.

The “best” accounting firms depend on context—size of the client (large enterprise vs. small business), services needed (audit, tax, advisory/consulting), prestige, or workplace quality—while the most-used products are accounting software brands that individuals and businesses rely on daily.

Top Accounting Firms by Size/Revenue

The clear leaders are the Big Four professional services networks, which dominate global and U.S. markets for audit, tax, consulting, and advisory work (especially for large corporations and public companies). Approximate recent global revenues (FY around 2025):

1. Deloitte — ~$70.5 billion (largest overall; strong in consulting and advisory).
2. PwC (PricewaterhouseCoopers) — ~$56.9 billion.
3. EY (Ernst & Young) — ~$53.2 billion.
4. KPMG — ~$39.8 billion.

These firms have hundreds of thousands of employees worldwide and work with the majority of Fortune 500/Global 500 companies. U.S. net revenue rankings (e.g., IPA Top 500 for recent years) show a similar order at the top, with Deloitte leading by a wide margin, followed by PwC, EY, and KPMG.

Next tier (mid-market/global networks, often better suited or more cost-effective for mid-sized companies):

• BDO
• RSM
• Grant Thornton
• Crowe
• Baker Tilly
• Forvis Mazars
• CLA (CliftonLarsonAllen)
• CBIZ
• Others frequently ranking high in the U.S.: Plante Moran, EisnerAmper/Citrin Cooperman, CohnReznick, Eide Bailly, Withum, Wipfli.

Rankings shift slightly year-to-year with mergers, organic growth, and focus areas (e.g., IPA U.S. rankings put RSM, Baker Tilly, and BDO high after the Big Four).

Prestige and Best Places to Work

• Prestige (Vault surveys of professionals): PwC frequently ranks #1, followed closely by Deloitte, EY, and KPMG. Mid-tier firms like Grant Thornton, BDO, RSM, Baker Tilly, and Crowe also rank highly.
• Best to work for (Vault Accounting rankings, based on employee surveys for culture, compensation, work-life balance, training, etc.): PwC has topped overall lists for many consecutive years (e.g., #1 for 2027), followed by EY and KPMG. Strong non-Big Four performers include Plante Moran, BDO, Baker Tilly, CohnReznick, and others.

Practical notes on firms people actually use:

• Large public companies and multinationals almost always use Big Four (or major mid-tier) for statutory audits and complex work due to expertise, global reach, and regulatory acceptance.
• Mid-sized businesses often prefer mid-tier or strong regional firms for more personalized service and better value.
• Small businesses, startups, freelancers, and individuals typically use local CPA firms, independent accountants, or bookkeeping services rather than Big Four (which are overkill and expensive for most). Many also handle basics themselves with software and consult a CPA seasonally for taxes.
• “Best” is highly situational—look at industry specialization (e.g., some firms excel in healthcare, tech, construction, nonprofits), location, specific expertise (tax strategy, M&A, ESG, tech/digital transformation), fees, and chemistry. Check recent client reviews, peer recommendations, and firm websites for niches.

Top Accounting Software/Products People Actually Use

Most small-to-medium businesses and individuals rely on software rather than (or in addition to) full-service firms. Market leaders by popularity and share:

• QuickBooks (Intuit, especially QuickBooks Online) — The dominant choice for small businesses in the U.S. and widely used globally. It holds a very large market share (estimates often 30%+ overall in tracked data, and far higher—60%+ in some small-business contexts). Features include invoicing, expense tracking, payroll, banking integrations, reporting, and accountant collaboration. Highly recommended as a starting point; accountants are very familiar with it.
• Xero — Strong cloud-based alternative, popular for its clean interface, unlimited users in higher plans, strong inventory/bank feeds, and international appeal. Excellent for growing small businesses.
• FreshBooks — Frequently praised for service-based businesses, freelancers, and easy invoicing/time-tracking. User-friendly.
• Wave — Popular free (or freemium) option for micro-businesses and very small operations needing basics like invoicing and simple bookkeeping.
• Zoho Books — Strong free/low-cost tier for micro-businesses; integrates well with other Zoho tools.
• Others widely used: Sage (various products, strong in certain segments), Oracle NetSuite (mid-market/ERP-level cloud accounting), and for larger/enterprise: SAP, Oracle Financials, Microsoft Dynamics.

Editors’/reviewer favorites often include QuickBooks Online (overall/versatile), FreshBooks (service businesses), Wave (basics/free), and Xero or Zoho for specific needs or value. Cloud-based tools dominate due to accessibility, automation, AI features (e.g., anomaly detection, bank reconciliation), and integrations.

Many firms and bookkeepers build practices around these tools (especially QuickBooks and Xero ecosystems). For very simple needs, spreadsheets or free tools suffice initially; as complexity grows, dedicated software + a professional is standard.

Recommendations Summary

• Large enterprise/complex needs/audit: Big Four (Deloitte, PwC, EY, KPMG)—choose based on relationship, industry expertise, or specific practice strengths. PwC often edges prestige/work rankings; Deloitte leads pure size/consulting scale.
• Mid-market: BDO, RSM, Grant Thornton, Baker Tilly, CLA, Crowe, Forvis Mazars, or strong regionals like Plante Moran.
• Small business/individual: Local reputable CPA or bookkeeper + software like QuickBooks Online (most common/people actually use it), Xero, or FreshBooks. Get referrals and compare a few.
• DIY/starting out: QuickBooks or a free option like Wave/Zoho; graduate to a pro for taxes/compliance.

Always verify current rankings (they update annually via Accounting Today, IPA, Vault, etc.), check for conflicts/independence (especially audits), and match to your specific situation, budget, and location. “Best” is what delivers accurate, timely, compliant results with good communication for your needs.