What Is Internal Audit? Meaning, Scope & Process

What Is Internal Audit? Meaning, Scope, Process & Benefits

Table of Contents:-

Internal audit is an independent and systematic review of an organisation’s internal controls, risk management, governance, compliance and business processes.

The purpose of internal audit is not merely to check accounting transactions. A modern internal audit function helps management and those charged with governance understand whether significant business risks are being appropriately managed, whether internal controls are effective and whether operations are functioning in accordance with policies, laws and organisational objectives.

The Institute of Chartered Accountants of India (ICAI) describes internal audit as providing independent assurance on the effectiveness of internal controls and risk management processes to enhance governance and achieve organisational objectives.

Companies requiring professional assistance may also refer to our Internal Audit Services in India.

Internal Audit Meaning

Internal audit is a structured assurance and review function designed to evaluate how effectively an organisation manages:

risks;
internal controls;
governance;
compliance;
financial processes;
operational processes; and
organisational resources.

Unlike a statutory audit, which primarily focuses on expressing an independent opinion on financial statements in accordance with applicable law, internal audit can examine almost any significant business process.

For example, internal audit may review:

procurement;
sales;
inventory;
payroll;
banking;
fixed assets;
GST and TDS compliance;
information technology;
cybersecurity;
vendor management;
customer credit;
regulatory compliance; and
fraud risks.

The precise scope depends on the organisation’s size, industry, risk profile and management requirements.

Definition of Internal Audit

ICAI’s internal audit framework defines internal audit around independent assurance over the effectiveness of internal controls and risk management processes, with the objective of enhancing governance and helping organisations achieve their objectives.

The ICAI Internal Audit Standards Board issues Standards on Internal Audit, technical guides and other professional literature relating to internal auditing in India.

The Institute of Internal Auditors (IIA) similarly positions internal auditing as an independent, risk-based and objective activity that supports the Board and management by providing assurance, advice, insight and foresight.

The current Global Internal Audit Standards became effective from January 9, 2025 and provide the international professional framework for internal auditing.

Why Is Internal Audit Needed?

Organisations increasingly operate in complex environments involving:

multiple regulations;
digital systems;
large transaction volumes;
cybersecurity risks;
global supply chains;
foreign exchange exposure;
complex contractual arrangements;
fraud risks; and
rapidly changing business models.

Management cannot always personally supervise every transaction or process.

Internal audit therefore provides an independent review mechanism that helps management understand whether business processes and controls are working as intended.

Main Objectives of Internal Audit

The objectives of internal audit may include:

evaluating internal controls;
identifying significant risks;
assessing risk-management processes;
reviewing statutory compliance;
evaluating operational efficiency;
identifying control gaps;
reducing fraud exposure;
safeguarding assets;
improving business processes;
improving reliability of financial and operational information; and
strengthening corporate governance.

For a more detailed discussion of practical audit areas, see our Internal Audit Checklist for Companies in India.

Scope of Internal Audit

The scope of internal audit can be significantly broader than financial accounting.

Depending on the organisation, internal audit may cover the following areas.

Financial Controls

Review may include:

accounting processes;
journal entries;
reconciliations;
revenue;
expenses;
receivables;
payables;
cash;
banking;
financial reporting; and
management reporting.

Procurement and Purchase

Internal audit may examine:

purchase requisitions;
quotations;
vendor selection;
purchase orders;
approvals;
receipt of goods;
invoice verification;
payments;
vendor master controls; and
conflicts of interest.

Sales and Receivables

The audit may cover:

customer onboarding;
credit limits;
pricing;
discounts;
sales orders;
dispatch;
invoices;
credit notes;
collections; and
overdue receivables.

Inventory

Internal audit may evaluate:

physical verification;
inventory movement;
valuation;
slow-moving stock;
obsolete inventory;
inventory adjustments;
warehouse controls; and
stock reconciliation.

Payroll and Human Resources

Review may include:

employee master;
salary computation;
attendance;
leave;
incentives;
employee reimbursements;
PF and ESI;
TDS on salary;
employee advances;
joining and resignation controls; and
full and final settlement.

Fixed Assets

Internal auditors may examine:

purchase approvals;
fixed asset register;
physical verification;
depreciation;
asset tagging;
disposal;
capitalisation; and
safeguarding of assets.

Tax and Regulatory Compliance

Internal audit can review:

GST;
TDS;
income-tax compliances;
Companies Act requirements;
labour laws;
FEMA;
licences;
statutory payments; and
regulatory filings.

Information Technology

Modern internal audits increasingly evaluate:

user access;
system security;
administrator rights;
change management;
data backup;
disaster recovery;
cybersecurity;
audit trails; and
segregation of duties within systems.

Fraud Risk

Internal audit may identify red flags such as:

duplicate payments;
fictitious vendors;
unusual journal entries;
payments on holidays;
transactions just below approval limits;
unauthorised discounts;
unusual credit notes;
inventory shortages; and
management override.

Governance and Risk Management

Internal audit may also evaluate whether:

significant risks are properly identified;
responsibilities are clearly defined;
Board and management oversight is effective;
policies are implemented;
risk appetite is understood; and
control deficiencies are appropriately addressed.

Types of Internal Audit

Internal audit can take different forms depending on the objective.

Common types include:

Financial Internal Audit

Focuses on accounting, financial reporting and related controls.

Operational Audit

Evaluates operational efficiency, productivity and effectiveness.

Compliance Audit

Reviews compliance with laws, regulations, policies and contractual requirements.

Process Audit

Examines an individual business process such as procurement, payroll or sales.

IT Audit

Evaluates information systems, cybersecurity, access controls and IT governance.

Risk Based Internal Audit

Focuses audit resources on areas posing the greatest risk to organisational objectives.

Read our detailed guide on Risk Based Internal Audit.

Checklist-Based vs Risk-Based Internal Audit

A checklist-based audit generally examines predefined controls and procedures.

For example:

Was the purchase order approved?
Was the invoice available?
Was GST correctly recorded?
Was payment authorised?

A risk-based audit begins by asking:

What are the significant risks affecting this process, and are those risks appropriately managed?

Both approaches can be useful.

The strongest internal audit methodology generally combines a structured checklist with risk-based professional judgement.

How Does the Internal Audit Process Work?

Although audit procedures differ across organisations, the internal audit process generally involves four broad stages:

Planning
Fieldwork
Reporting
Follow-up

Stage 1 – Planning

The internal auditor:

understands the business;
identifies relevant risks;
defines audit objectives;
determines scope;
understands internal controls; and
prepares an audit programme.

Stage 2 – Fieldwork

The auditor performs procedures such as:

interviews;
walkthroughs;
document inspection;
transaction testing;
sampling;
analytical review;
physical verification; and
data analytics.

Stage 3 – Reporting

Findings are evaluated and discussed with management.

The internal audit report may include:

observation;
risk implication;
root cause;
recommendation;
management response;
responsible person; and
target completion date.

Stage 4 – Follow-Up

Internal audit verifies whether management has implemented agreed corrective actions.

For a detailed explanation, read our Internal Audit Process: Step-by-Step Guide.

Internal Audit Planning

Internal audit planning helps determine which areas should be audited and how internal audit resources should be allocated.

Planning may involve:

understanding business objectives;
identifying the audit universe;
assessing risks;
considering previous findings;
obtaining management input;
prioritising audit areas; and
developing an annual audit plan.

ICAI’s current Standards on Internal Audit specifically include SIA 220 – Conducting Overall Internal Audit Planning.

The latest standards can be accessed through the ICAI Standards on Internal Audit.

Internal Audit Sampling

Internal auditors normally do not need to examine every transaction.

Sampling may be used to select representative or risk-focused transactions.

Sample size and selection depend on matters such as:

risk;
population;
expected errors;
audit objective;
significance;
controls; and
professional judgement.

Higher-risk transactions may require larger samples or even 100% testing.

Read our detailed guide on Sampling in Internal Audit.

Internal Audit Documentation

The internal auditor should maintain adequate documentation supporting:

planning;
risk assessment;
audit programme;
procedures;
samples;
evidence;
findings;
conclusions; and
reporting.

Documentation helps demonstrate the basis for audit conclusions and facilitates supervision and quality review.

ICAI’s current Standards on Internal Audit include specific standards dealing with documentation and audit evidence.

What Is an Internal Audit Report?

An internal audit report communicates the results of the internal audit to management and, where appropriate, those charged with governance.

A good internal audit report should clearly explain:

what was reviewed;
what was found;
why the finding matters;
why the issue occurred;
what corrective action is recommended;
management’s response;
who is responsible; and
when action should be completed.

Findings may also be classified as:

Critical;
High;
Medium; or
Low.

Example of an Internal Audit Observation

Suppose an auditor finds that vendor bank details can be changed by one employee without independent approval.

Observation

The same employee can modify vendor bank details without maker-checker approval.

Risk

Fraudulent bank details could be entered into the vendor master, potentially resulting in unauthorised payments.

Root Cause

The ERP system does not require independent approval of vendor bank-detail changes.

Recommendation

Implement maker-checker control for changes in vendor bank details and maintain an audit log of all modifications.

This illustrates how internal audit goes beyond merely identifying an exception and evaluates the underlying risk and control weakness.

Benefits of Internal Audit

Internal audit can provide significant benefits to an organisation.

Better Internal Controls

Audit identifies control weaknesses and recommends improvements.

Improved Risk Management

Management gains better visibility over significant risks.

Fraud Prevention and Detection

Internal audit can identify weaknesses that may permit fraud or misuse.

Better Compliance

Internal audit can help identify non-compliance before it leads to significant regulatory consequences.

Operational Improvement

Auditors may identify inefficient processes, duplication and unnecessary costs.

Better Governance

Internal audit provides objective information to senior management, the Audit Committee and Board.

Safeguarding Assets

Internal audit evaluates controls over cash, inventory, fixed assets and other resources.

Better Decision-Making

Reliable information and stronger controls can improve management decision-making.

Limitations of Internal Audit

Internal audit does not eliminate every business risk.

Limitations may arise due to:

sampling;
management override;
collusion;
limitations in audit scope;
insufficient information;
human judgement;
rapidly changing business risks; and
resource constraints.

Internal audit therefore provides reasonable assurance and insight rather than a guarantee that every error or fraud will be detected.

Internal Audit Under Companies Act, 2013

Section 138 of the Companies Act, 2013 requires prescribed classes of companies to appoint an internal auditor.

The section provides that the internal auditor may be:

a Chartered Accountant;
a Cost Accountant; or
such other professional as may be decided by the Board.

The Central Government has prescribed the classes of companies to which internal audit requirements apply through the Companies (Accounts) Rules, 2014.

The official text of the Companies Act, 2013 can be accessed through the Ministry of Corporate Affairs.

Is Internal Audit Mandatory for Every Company?

No.

Internal audit under Section 138 is mandatory only for prescribed classes of companies.

Other companies may nevertheless conduct internal audits voluntarily because of:

management requirements;
investor requirements;
group policies;
lender requirements;
governance needs;
fraud risks;
rapid growth; or
operational complexity.

Applicability should always be checked based on the current Companies Act provisions and applicable rules.

Who Can Be Appointed as Internal Auditor?

Section 138 provides that an internal auditor may be a Chartered Accountant, Cost Accountant or such other professional as the Board may decide.

Depending upon applicable legal and governance requirements, the function may be performed by:

an in-house professional;
an internal audit department; or
an outsourced internal audit professional or firm.

For professional assistance with outsourced internal audit, see our Internal Audit Services in India.

Internal Auditor vs Statutory Auditor

Internal audit and statutory audit serve different purposes.

Internal Audit

Primarily focuses on:

controls;
risks;
operations;
compliance;
governance; and
process improvement.

Statutory Audit

Primarily focuses on:

audit of financial statements;
applicable financial reporting framework;
statutory reporting;
audit evidence; and
expression of an independent audit opinion.

For statutory audit assistance, see our Statutory Audit Services in India.

Internal Audit vs Internal Control

These terms should not be confused.

Internal controls are processes and procedures implemented by management to manage risks.

Examples include:

approval requirements;
password restrictions;
bank reconciliations;
segregation of duties; and
physical inventory controls.

Internal audit independently evaluates whether such controls are appropriately designed and operating effectively.

Internal Audit vs External Audit

Internal auditors generally focus on governance, risks, controls and organisational improvement.

External statutory auditors provide an independent opinion on financial statements and perform statutory reporting responsibilities.

The two functions may coordinate where appropriate, but their objectives and responsibilities remain different.

Internal Audit Charter

An internal audit charter formally defines:

purpose;
mandate;
authority;
organisational position;
reporting relationships;
independence;
scope; and
responsibilities

of the internal audit function.

A strong charter helps protect the independence of the internal audit function.

Read our detailed Internal Audit Activity Charter Guide.

Independence of Internal Audit

Independence is an important principle of internal auditing.

The internal audit function should be positioned so that auditors can perform work objectively and communicate significant findings without inappropriate interference.

Internal auditors should also avoid assuming operational responsibility for activities that they subsequently audit.

The IIA’s current Global Internal Audit Standards specifically emphasise appropriate organisational positioning, Board accountability and freedom from undue influence.

Internal Audit for Foreign-Owned Companies in India

Internal audit can be particularly useful for Indian subsidiaries of overseas groups.

The audit may provide assurance over areas such as:

compliance with group policies;
delegation of authority;
related-party transactions;
transfer pricing;
FEMA;
overseas remittances;
GST;
TDS;
payroll;
local regulatory compliance;
inter-company balances;
IT controls; and
group reporting.

This helps overseas headquarters obtain greater visibility over local Indian operations.

When Should a Company Consider Internal Audit?

Even where internal audit is not legally mandatory, companies may consider it when:

business operations are expanding rapidly;
transaction volume has increased;
multiple branches exist;
overseas shareholders require assurance;
control failures are recurring;
fraud risks are significant;
new ERP systems are introduced;
regulatory exposure has increased;
management needs better process visibility; or
investor/lender governance requirements have increased.

How Often Should Internal Audit Be Conducted?

There is no universal frequency applicable to every organisation.

Internal audit frequency should depend on:

risk;
business size;
complexity;
regulatory requirements;
previous audit results; and
management requirements.

High-risk areas may be audited quarterly or more frequently, while lower-risk processes may be reviewed annually or periodically.

Frequently Asked Questions

What is internal audit in simple words?

Internal audit is an independent review of an organisation’s risks, internal controls and business processes to identify weaknesses and help management improve governance and operations.

What is the main purpose of internal audit?

The main purpose is to provide independent assurance and insight regarding the effectiveness of risk management, internal controls and governance.

What does an internal auditor check?

Internal auditors may review procurement, sales, inventory, payroll, banking, taxation, IT systems, compliance, fixed assets, fraud risks and other business processes.

Is internal audit mandatory in India?

Internal audit is mandatory for prescribed classes of companies under Section 138 of the Companies Act, 2013 and applicable rules. Other organisations may undertake internal audit voluntarily.

Who appoints an internal auditor?

The appointment is governed by applicable corporate law and the organisation’s governance framework. Under Section 138, the Board plays an important role in the appointment of the internal auditor.

Can internal audit be outsourced?

Yes, subject to applicable requirements and the organisation’s circumstances, companies may engage external professionals to perform internal audit.

What is the difference between internal audit and statutory audit?

Internal audit focuses mainly on risk, controls, governance, compliance and operational improvement, whereas statutory audit focuses primarily on the financial statements and statutory audit reporting.

Does an internal auditor check every transaction?

Not necessarily. Internal auditors may use sampling, data analytics or targeted testing depending on the audit objective and risk.

Does internal audit detect fraud?

Internal audit may identify fraud indicators and control weaknesses that increase fraud risk, but internal audit does not guarantee detection of every fraud.

What are the four main stages of internal audit?

The four broad stages are planning, fieldwork, reporting and follow-up.

For the full process, see our Internal Audit Process Guide.

Internal Audit Services in India

EzyBiz India Consulting LLP assists Indian and foreign-owned businesses with internal audits, process reviews, risk assessments, internal control reviews and compliance audits.

Our approach focuses on understanding business risks, testing important controls, identifying root causes and providing practical recommendations to management.

For professional assistance, visit our Internal Audit Services in India or our broader Audit and Assurance Services in India.

Related Services

Authoritative References

Prepared By: EzyBiz India Consulting LLP
Reviewed By: Anil Agrawal, Chartered Accountant
Last Updated: August 2026

Disclaimer

The information provided on this page is for general informational and educational purposes only and should not be construed as audit, legal, accounting or regulatory advice. Internal audit applicability, scope, frequency and procedures depend upon the organisation’s legal status, size, industry, risk profile, applicable regulations, internal controls and specific circumstances. Readers should verify current statutory requirements and obtain appropriate professional advice before taking any decision based on this information.

What is Internal Audit