In today's fast-moving digital era, data has become one of a company's most valuable assets. The value of data, however, is determined not only by its content but also by how that data is managed, tracked, and secured. This is where the importance of the audit trail comes in.
Audit trail is a term that comes up often in business and information technology, yet not everyone understands why the concept matters.
Put simply, an audit trail is a series of records documenting every activity or change within a system, whether in a business, financial, or technology environment.
In this article we look more closely at the definition, functions, and practical examples of audit trails, and at how an IT audit trail can become an essential tool for protecting data integrity and preventing security threats.
What Is an Audit Trail?
An audit trail is a set of chronological records documenting every change or activity within a system.
These records cover who made the change, when the change was made, and what was changed.
This audit is essential for maintaining data integrity, because it allows a company to track every activity that takes place in its systems.
In business and information technology, this audit plays a vital role in ensuring transparency and accountability.
In an IT system, for example, this audit can record every user login, data change, or access to sensitive information, making it easier to identify suspicious activity.
What Is the Function of an Audit Trail in Business?
This audit serves several important functions in business. One of the main ones is as a tool for tracking and analysing system activity.
With this audit, a company can find out who made a particular change and when it happened — highly useful in internal or external investigations.
This audit also works as a preventive measure. With detailed records in place, employees think twice before acting outside company policy, because every step they take can be traced back.
What Are the Types of Audit Trail?
An audit trail does not take only one form. Types are usually distinguished by the system being recorded and the purpose of the recording, and an organization generally uses several types at once.
| Type of audit trail | What is recorded | Example systems |
|---|---|---|
| Financial or accounting | The trail of a transaction from the source document to the journal, general ledger, and financial statements, including corrections and approvals | Accounting applications and ERP finance modules |
| System or IT | Logins, configuration changes, and data changes by users as well as administrators | Operating systems, databases, and business applications |
| Security | Failed access attempts, changes to access rights, and events that indicate an intrusion | Firewalls and security monitoring systems |
| Data access | Who viewed, downloaded, changed, or deleted sensitive data | Customer databases and HR systems |
The system and security types are discussed in more detail in the IT audit trail section below, while the financial type is discussed in the accounting audit trail example section.
What Is an IT Audit Trail?
An IT audit trail is a type of audit trail that specifically records activity within IT systems.
This includes records of who accessed the system, when they accessed it, and what they did while inside it.
This IT audit is essential for supporting cybersecurity, because it helps monitor and identify potential threats.
In an increasingly digital world, having a strong IT audit is a necessity.
Organisations can use this IT audit to maintain data integrity, ensure regulatory compliance, and protect systems from unauthorised access.
What Is Recorded in an Audit Trail?
A useful audit trail record answers six questions: who, when, what, where, and the values before and after the change. A record that contains only who and when does prove that a piece of data was changed, but it does not show what changed, so it is hard to use for tracing errors or fraud.
The following table uses one fictitious example: a supplier invoice amount changed from IDR 18,400,000 to IDR 81,400,000.
| Components | What is recorded | Example entry |
|---|---|---|
| User identity | Individual account ID that performed the action, not a shared account | rina.keuangan |
| Time | Date and time with a consistent time zone | 12 November 2026, 14:32 WIB |
| Type of action | Create, change, approve, or delete | Change |
| Object | The document or data affected by the action | Supplier invoice INV-0412, amount field |
| Value before | Data content before the change | IDR 18,400,000 |
| Value after | Data content after the change | IDR 81,400,000 |
| Source | IP address or device used | IP address 10.20.4.17, office laptop |
| Reason or approval | Basis for the change, if the system requires it | Typo correction, approved by the head of finance |
A single record row like this immediately shows who changed the invoice amount, when, from which device, and what the difference is. Without the before and after columns, the reviewer only knows that the invoice was changed.
What Are Examples of an Audit Trail?
This audit can be applied in many contexts, from finance through to e-commerce.
In banking systems, for instance, this audit is used to record every transaction, such as fund transfers, withdrawals, or bill payments.
Every transaction detail, such as the time and the amount, is stored in the audit record to ensure accuracy and security.
Another example is e-commerce platforms, where this audit records all user activity, from product browsing through to the payment process.
This lets a company track user behaviour and improve the overall customer experience.
See also: 8 Recommended Audit Trail Software for Businesses in Indonesia
What Is an Example of an Accounting Audit Trail?
In accounting, an audit trail means every figure in the financial statements can be traced back to its source document, and vice versa. Below is a fictitious illustration of one inventory purchase worth IDR 25,000,000, ignoring tax for simplicity.
- Source document. Supplier invoice number INV-0412, along with the purchase order and goods receipt.
- Journal. The transaction is recorded in the purchases journal: debit Inventory and credit Accounts Payable, each IDR 25,000,000, with a reference number pointing to the invoice.
- General ledger. The journal is posted to the Inventory and Accounts Payable accounts, and each general ledger line carries the number of its originating journal.
- Financial statements. The balances of both accounts flow into the balance sheet and can be broken down back to the general ledger, the journal, and then the invoice.
What if an error occurs? For example, the journal was recorded at IDR 52,000,000 although the invoice is worth IDR 25,000,000. The correction is made with a reversing or correcting journal entry, not by deleting or overwriting data. The erroneous entry is reversed on the debit and credit side, then the correct entry is recorded. As a result, the original entry, the reversing entry, and the correct entry all remain visible, along with who created and approved them.
How Does an Audit Trail Relate to Vouching and Tracing?
An audit trail is the path that makes these two auditor procedures possible. In vouching, the auditor starts from the accounting records, for example one line in the general ledger, then traces back to the source document to test the existence of the transaction. In tracing, the direction is the opposite: from the source document to the accounting records to test the completeness of recording. Without reference numbers and an intact trail, both procedures are hard to perform.
What Are the Challenges in Managing an Audit Trail?
Important as it is, managing this audit should not be taken lightly. Some of the challenges commonly encountered include:
- A very large volume of log data
- Integration across many different systems
- Protecting logs against tampering
- Separating normal activity from anomalies
How to Implement a Reliable Audit Trail?
A reliable audit trail is not enough just to be switched on. The following five steps can serve as a guide:
- Set a policy. Determine which systems and data must be recorded, the minimum components of each record, the log owner, and the retention period.
- Record automatically. Recording is done by the system, not by manual input, so it does not depend on user compliance. Also synchronize the time settings across systems so the sequence of events can be read.
- Restrict access to logs. Logs can be read by authorized parties but cannot be changed or deleted by the users whose activity is recorded, including system administrators.
- Back up logs. Make copies regularly in a location separate from the source system, and test that those copies can be restored.
- Review periodically. Review logs to look for unusual patterns, for example changes outside working hours or large-scale data deletion, then follow up on the findings.
These steps also address the challenges discussed earlier, especially protecting logs from manipulation. Access restrictions and log reviews are also part of how to run internal control well.
What Are the Benefits of an Audit Trail for Security and Compliance?
This audit is essential for ensuring data security and regulatory compliance.
In the context of regulations such as GDPR or HIPAA, this audit can serve as evidence that a company has complied with data protection standards.
GDPR applies in the European Union and HIPAA in the United States, so both are mainly relevant to organizations that process the data of EU residents or health data in the United States. For organizations in Indonesia, the main references are national regulations such as the Personal Data Protection Law and Government Regulation 71 of 2019, which are discussed in the legal basis section below.
This audit also helps identify and respond to security threats quickly, because every activity is recorded in detail.
With this audit, a company not only protects its data but also builds customer trust, because customers know that every activity in the system is recorded and can be audited at any time.
What Is the Legal Basis and Retention Period of an Audit Trail in Indonesia?
Indonesia has no single law that specifically regulates audit trails. The obligations to record and retain them are spread across several regulations. The following provisions were checked against their official sources as of November 2026 and are recorded as still in force:
- Law Number 8 of 1997 on Company Documents. Article 11 paragraph (1) requires records, accounting evidence, and supporting financial administration data to be kept for 10 years from the end of the financial year of the company concerned. Article 12 paragraph (1) and Article 15 paragraph (1) allow documents to be transferred to microfilm or other media and state that the result is valid evidence. The law does not mention system logs specifically, so logs that form part of supporting financial administration data should preferably follow the same retention period, with the application confirmed with legal counsel or the compliance function.
- Government Regulation Number 71 of 2019 on the Implementation of Electronic Systems and Transactions. Article 22 paragraph (1) requires electronic system operators to provide an audit trail of all electronic system operations. According to paragraph (2), this audit trail is used for supervision, law enforcement, dispute resolution, verification, testing, and other examinations. The elucidation of Article 22 paragraph (1) mentions maintaining transaction logs in line with the operator's data retention policy and prevailing laws and regulations.
- Law Number 27 of 2022 on Personal Data Protection. Article 31 requires personal data controllers to record all personal data processing activities, and Article 39 paragraphs (1) and (2) require prevention of unauthorized access with a reliable, secure, and accountable security system. The two-year adjustment period since this law was promulgated on 17 October 2022 has ended.
- OJK Regulation Number 11/POJK.03/2022 on the Implementation of Information Technology by Commercial Banks. Article 54 paragraph (2) requires banks to ensure the availability of an audit trail for all IT operations for the purposes of supervision, law enforcement, dispute resolution, verification, testing, and other examinations. Its implementing provision, OJK Board of Commissioners Member Regulation Number 1 of 2026, effective 1 March 2026, also asks banks to define log types, retention periods, periodic reviews, and protection of logs from disruption and unauthorized access.
- SA 500 (Revised 2021) on Audit Evidence, IAPI. Paragraph 7 requires the auditor to consider the relevance and reliability of information used as audit evidence. Paragraph A31 states that the reliability of evidence from internal sources increases when the controls over its preparation and maintenance are operated effectively by the entity. A well-maintained audit trail can be part of those controls, thereby helping the auditor rely on the entity's records. Further discussion is in the article audit evidence.
Other sector-specific provisions, for example in taxation, may set their own retention obligations. When more than one provision applies, organizations commonly use the longest retention period and set it out in a written retention schedule. Article 11 paragraph (4) of Law 8/1997 itself requires a retention schedule determined by the company's management for documents other than records and accounting evidence. This explanation is general information and not legal advice.
See also:
- Get to know what an IT Audit is and its types, objectives, procedures, and examples
- Familiar with Information Systems Audit along with examples and stages
FAQ About Audit Trail
What is audit trail?
Audit trail is a set of chronological records documenting every change or activity within a system — covering who made the change, when it was made, and what was changed.
What is the function of an audit trail in business?
Its main function is to track and analyse system activity, which makes it useful for both internal and external investigations. Detailed records also act as a preventive measure — every step can be traced back, making actions outside company policy easier to deter.
What is IT audit trail?
IT audit trail is a type of audit trail that specifically records activity within IT systems: who accessed the system, when, and what they did while inside it. These records support cybersecurity by helping to monitor and identify potential threats.
What are examples of an audit trail?
In banking systems, audit trail records every transaction — fund transfers, withdrawals, or bill payments — complete with the time and the amount. On e-commerce, the records cover all user activity, from product browsing through to the payment process.
What are the challenges in managing an audit trail?
Four challenges are commonly encountered: a very large volume of log data, integration across many different systems, protecting logs against tampering, and separating normal activity from anomalies.
How audit trail supports regulatory compliance?
In the context of regulations such as GDPR or HIPAA, audit trail serves as evidence that the company has complied with data protection standards. Detailed records also speed up the identification of, and response to, security threats.
What information is recorded in an audit trail?
A useful record contains the user identity, time, type of action, the object affected, the values before and after the change, and the source of the action such as an IP address or device. The before and after columns matter so that the reviewer knows what changed, not merely that the data was changed.
How long must an audit trail be retained in Indonesia?
Law 8/1997 Article 11 paragraph (1) requires records, accounting evidence, and supporting financial administration data to be kept for 10 years from the end of the company's financial year. The law does not mention system logs specifically, while the elucidation of Article 22 of Government Regulation 71/2019 leaves the maintenance of transaction logs to the operator's retention policy in line with prevailing laws and regulations. Therefore, set the log retention period in a written retention schedule and confirm it with legal counsel or the compliance function.
How can you correct data without damaging an audit trail?
Use a reversing or correcting journal entry, not deleting or overwriting data. The erroneous entry is reversed, then the correct entry is recorded, so all three remain visible along with who created and approved them.
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