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Grant Thornton vs Deloitte

Grant Thornton and Deloitte both land on Depends.

Deloitte

deloitte.com

Depends
Confidence: Medium

Right fit for large enterprises with complex audit, tax, or security needs and budget for a Big Four engagement.

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Grant Thornton versus Deloitte
CompareGrant ThorntonDeloitte
VerdictDependsDepends
Best forMid-market audit engagementsGlobal enterprises needing audit and tax
Who it's not forSmall businesses needing basic tax prepSmall businesses needing basic tax or bookkeeping
PrivacyMultiple audit-failure fines (SEC 2015, PCAOB 2017 and 2022, UK 2021) plus £21m negligence damages; no client data breach found in sources reviewed.³Multiple public incidents: 2017 client-email breach, 2025 Rhode data-breach payout, 2026 CVE disclosed.15
Support qualityHigh turnover and PE-related staff complaintsNo client-support evidence found
Public sentimentPublic feedback is almost entirely employee-side, citing high turnover and private-equity-driven decline, while verifiable client reviews are nearly nonexistent.⁸Client-facing products score 4.2/5 on G2, but 25,000+ employees rate the firm just 3.6/5.11
Biggest gotchaRegulatory fine history: SEC, PCAOB, and UK penalties spanning 2015-2022. Scrutinize engagement QA terms.⁴2017 hack revealed clients' confidential emails15

Pick Grant Thornton when

  • Mid-market audit engagements
  • PE-backed firms needing tax and advisory
  • Fraud investigation mandates
  • Enterprise cyber risk advisory

When Grant Thornton is not a fit

  • Small businesses needing basic tax prep
  • Startups wanting cheap bookkeeping
  • Buyers wanting a stable, independent boutique
  • Anyone expecting published, transparent pricing

Pick Deloitte when

  • Global enterprises needing audit and tax
  • Regulated industries (banking, government)
  • Large transformations and cyber incident response

When Deloitte is not a fit

  • Small businesses needing basic tax or bookkeeping
  • Buyers wanting published pricing or self-serve
  • Teams needing quick, fixed-scope projects
  • Anyone without six-figure-plus engagement budgets

Sources

  1. Grant Thornton official sitegrantthornton.com
    official
  2. Grant Thornton LLP . Wikipediaen.wikipedia.org
    news
  3. SEC Fines Grant Thornton, Partners Over Missed Red Flagslaw360.com
    security
  4. PCAOB Fines Grant Thornton $1.5 Millioncfo.com
    security
  5. Grant Thornton UK fined for skepticism failures in Interserve auditcomplianceweek.com
    security
  6. Supreme Court rules Grant Thornton must pay £13.4maccountingweb.co.uk
    security
  7. Grant Thornton 'high turnover' reviews . Glassdoorglassdoor.com
    review
  8. Don't work for Grant Thornton. PE is destroying it . Redditreddit.com
    review
  9. IndusInd Bank Taps Grant Thornton For Fraud Checksnews18.com
    news
  10. Grant Thornton Reviews . G2g2.com
    review
  11. Deloitte Products on G2g2.com
    review
  12. Deloitte Reviews . AmbitionBoxambitionbox.com
    review
  13. Trustpilot reviews of deloitte.comtrustpilot.com
    review
  14. r/deloitte employee discussionsreddit.com
    review
  15. Guardian: Deloitte hit by cyber-attack revealing clients' emailstheguardian.com
    security
  16. Deloitte pays $5M over Rhode breachcybersecuritydive.com
    security