The global 'Big Four' accounting firms—Deloitte, Ernst & Young (EY), KPMG, and PricewaterhouseCoopers (PwC)—are actively exploring blockchain technology to enhance financial auditing. These industry leaders have joined initiatives such as a pilot program with a consortium of 20 Taiwanese banks to test blockchain applications in auditing processes.
This move signals a significant shift in how external audits may be conducted in the future, offering greater transparency, efficiency, and reliability.
Understanding External Auditing
An external audit is an objective examination of an organization's accounts, financial records, and internal processes. Its goal is to determine whether the company’s financial statements provide a "true and fair" view of its performance and position. Audits are conducted according to established standards, such as the International Financial Reporting Standards (IFRS) or Generally Accepted Accounting Principles (GAAP).
Despite their crucial role in ensuring corporate accountability, auditors often face criticism for failing to detect issues before they escalate. Blockchain technology promises to address some of these challenges.
How Blockchain Can Transform Auditing
Traditional external audits are often labor-intensive, requiring specialized teams to manually review vast numbers of transactions and documents. Blockchain, with its core features of decentralization, immutability, and transparency, can streamline many of these processes.
Russell Guthrie, Chief Financial Officer of the International Federation of Accountants (IFAC), notes:
“New technologies like blockchain and artificial intelligence are transforming the global profession. They raise the bar and drive demand for new skills and competencies among employees.”
One immediate application is in external confirmations—a critical part of auditing where third-party sources validate a company’s internal data. If a company’s ledger is built on a decentralized public blockchain, auditors can access and verify transactions without lengthy confirmation procedures.
For example, if Company A records a liability to Company B, an auditor can cross-check this entry against the public ledgers of both entities, saving time and reducing the risk of errors.
Blockchain also simplifies the review of banking details, including accounts, loans, guarantees, and signing authorities, by making relevant data continuously accessible and verifiable.
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Limitations of Blockchain in Auditing
While blockchain enhances transactional transparency, it does not eliminate the need for professional judgment in certain auditing areas. Valuation of assets, revenue recognition, and accrual-based accounting often involve estimates and uncertainties that require deep industry knowledge and contextual analysis.
Even with widespread blockchain adoption, auditors will still need to interpret complex financial scenarios and assess management’s assumptions.
How the Big Four Are Adopting Blockchain
The four largest auditing firms are investing heavily in blockchain research and implementation. Here’s how each is approaching the technology:
Deloitte
In May 2016, Deloitte established its first blockchain lab in Dublin to collaborate with international organizations developing blockchain solutions. The firm has also identified blockchain as a key asset for the retail and consumer goods industry.
EY
EY became the first consulting firm to accept Bitcoin as payment for its services in early 2017. Its Swiss branch also supports the Bitcoin Association Switzerland (BAS), underscoring its commitment to cryptocurrency integration.
PwC
PwC launched Vulcan Digital Asset Services in November 2016, enabling the use of digital assets in banking and commerce. It also acquired a minority stake in VeChain, a Chinese startup using blockchain for supply chain transparency and product authentication.
Pierre-Edouard Wahl, Head of Blockchain at PwC Switzerland, shared:
“We offer a broad range of services—working with startups and established firms to provide guidance in legal, tax, insurance, and code review contexts. We aim to ensure things are done correctly and, where regulation allows, to influence positive change.”
KPMG
In September 2016, KPMG introduced its Digital Ledger Services to help financial firms leverage blockchain. The company also joined the Wall Street Blockchain Alliance (WSBA) in November 2017.
The Future of Auditing
Blockchain is poised to enhance auditing effectiveness and reduce the need for certain repetitive procedures. However, auditors will continue to play a vital role in interpreting complex financial information and applying professional judgment.
As Marcel Stalder, CEO of EY Switzerland, emphasized:
“It’s important for everyone to engage with the business revolution brought by blockchain.”
Future audit procedures will likely evolve to include more IT controls and public ledger verification, ensuring that financial statements remain accurate and trustworthy in a rapidly changing digital economy.
Frequently Asked Questions
What is the main benefit of blockchain in auditing?
Blockchain improves transparency, reduces manual verification work, and enhances the reliability of audited data through immutable and decentralized record-keeping.
Will blockchain replace auditors?
No. While blockchain automates certain validations, auditors are still needed for complex judgments, estimates, and compliance assessments.
How does blockchain help with cross-company audits?
Auditors can compare transactions across organizations using shared ledgers, simplifying reconciliation and reducing disputes.
Is blockchain widely adopted in auditing today?
Not yet. Most applications are still in pilot stages, but major firms are investing significantly in blockchain-based solutions.
What are the risks of using blockchain in auditing?
Challenges include regulatory uncertainty, integration with legacy systems, and the need for new skill sets among auditing professionals.
Can small accounting firms use blockchain?
Yes. As the technology matures and becomes more accessible, smaller firms will likely adopt cloud-based blockchain auditing tools.