Hong Kong Standards on Auditing (HKSAs): Key Principles Explained (2026)

Every private limited company in Hong Kong must have its financial statements audited by a Hong Kong Certified Public Accountant (CPA) each year. The audit must be conducted in accordance with the Hong Kong Standards on Auditing (HKSAs), a set of standards issued by the Hong Kong Institute of Certified Public Accountants (HKICPA) that govern how auditors carry out their work.

This guide explains what the HKSAs are, who sets and enforces them, and what the key standards require. For context on the annual audit obligation, see our annual requirements guide and our profits tax guide.

What are the HKSAs?

The Hong Kong Standards on Auditing (HKSAs) are the professional standards that govern how auditors conduct audits of financial statements in Hong Kong. They set out the objectives, requirements, and guidance for audit work.

The main goal of an audit is to provide an independent, objective opinion on whether a company's financial statements give a true and fair view of the company's financial position and comply with applicable accounting standards. In Hong Kong, this opinion is required by law for all private limited companies before they can file their Profits Tax Return (BIR51). For the tax filing process that requires audited accounts, see our Hong Kong corporate tax guide.

Audited financial statements must include:

• Balance sheet (statement of financial position)
• Income statement (profit and loss account)
• Statement of changes in equity
• Cash flow statement
• Notes to the accounts
• Auditor's report

Who sets and enforces the HKSAs?

HKICPA

The Hong Kong Institute of Certified Public Accountants (HKICPA) issues the HKSAs through its Auditing and Assurance Standards Committee (AASC). Compliance with the HKSAs is mandatory for all HKICPA members who conduct audits. Non-compliance can lead to disciplinary action, including suspension or removal of the practicing certificate.

AFRC

The Accounting and Financial Reporting Council (AFRC) is the independent regulator that oversees the accounting profession. Its responsibilities include:

• Overseeing the development and implementation of the HKSAs
• Ensuring auditor compliance with the standards
• Investigating potential breaches
• Promoting high-quality financial reporting in Hong Kong

Alignment with international standards

The HKSAs are closely aligned with the International Standards on Auditing (ISAs) issued by the International Auditing and Assurance Standards Board (IAASB). This alignment ensures that financial statements audited in Hong Kong under HKSAs are comparable and credible in international markets.

Hong Kong Financial Reporting Standards (HKFRS)

While the HKSAs govern how audits are conducted, companies prepare their financial statements under the Hong Kong Financial Reporting Standards (HKFRS), which align closely with IFRS as adopted by the IASB. Hong Kong adopted HKFRS (aligned with IFRS) in 2005. For a full explanation of the applicable standards, see our Hong Kong accounting standards guide.

A smaller entity may use the SME Financial Reporting Standard (SME-FRS) if it qualifies. In either case, the audit of those financial statements is conducted under the HKSAs.

Key HKSAs and what they require

HKSA 200: Overall objectives of the independent auditor

The foundation standard. It requires auditors to:

• Obtain reasonable assurance that financial statements are free from material misstatement (whether from error or fraud)
• Maintain independence throughout the engagement
• Exercise professional skepticism: questioning management's explanations rather than accepting them at face value, and remaining alert to evidence that contradicts stated assumptions

HKSA 210: Terms of engagement

Requires a formal engagement letter before the audit begins. The letter documents the scope, objectives, responsibilities of each party, and the basis for fees. It prevents misunderstandings and gives both parties a clear reference if disputes arise.

HKSA 220: Quality control for an audit of financial statements

Audit firms must maintain systems to ensure consistent quality across all engagements. Quality control procedures cover:

• Assignment of qualified personnel to each engagement
• Direction, supervision, and review of audit work
• Consultation on difficult or contentious matters
• Monitoring of the firm's own quality control policies

HKSA 230: Audit documentation

Auditors must prepare and retain documentation that records:

• The procedures performed
• The evidence obtained
• The conclusions reached

This documentation provides the basis for the auditor's opinion and must be sufficient to allow an experienced auditor with no prior connection to the engagement to understand what was done and why.

HKSA 240: Fraud and error

This standard sets out the auditor's responsibilities for detecting and reporting fraud. Key requirements:

• Maintain professional skepticism about the possibility of fraud throughout the engagement
• Perform risk assessment procedures specifically designed to identify fraud risks
• Test internal controls to assess whether fraud could occur undetected
• Report identified or suspected fraud to those charged with governance

HKSA 250: Laws and regulations

The auditor must understand the laws and regulations that apply to the company and its industry. If potential non-compliance is identified (for example, breaches of tax law or industry regulations), the auditor must evaluate the impact on the financial statements and report findings to management and those charged with governance.

HKSA 260: Communication with those charged with governance

Requires the auditor to communicate with the board of directors (or audit committee) on:

• The planned scope and timing of the audit
• Significant findings during the audit
• Weaknesses in internal controls identified
• Disagreements with management
• Any limitations on the scope of work

The auditor's final report is the primary communication channel, summarizing findings and delivering the audit opinion.

HKSA 570: Going concern

The auditor must assess whether the company can continue operating for the foreseeable future (typically at least 12 months from the date the financial statements are authorised for issue). If there are material uncertainties about going concern, these must be disclosed in the audit report.

HKSA 610: Using the work of internal auditors

Where a company has an internal audit function, the external auditor may use the internal auditors' work to inform their understanding of the company's operations and controls. However, the external auditor must still perform their own procedures to determine how much reliance can be placed on the internal audit work.

HKSA 620: Related parties

The auditor must identify all significant transactions with related parties (entities or individuals with close relationships to the company) and perform additional procedures to confirm those transactions are properly authorised, disclosed, and measured. Related-party transactions carry higher risk of manipulation.

Summary of key HKSAs

The table below lists the most frequently referenced HKSAs and the core scope of each:

HKSA 315 and HKSA 330 work together. HKSA 315 requires the auditor to identify where material misstatements could occur and why. HKSA 330 then requires the auditor to design and perform procedures specifically to address those identified risks. Together they form the core of the risk-based audit approach used in Hong Kong.

HKSA 500 sets the general requirements for what counts as sufficient and appropriate audit evidence. It is the foundation standard for all evidence-gathering. HKSA 505 extends this to external confirmations, such as bank confirmation letters and debtor confirmation requests sent directly to third parties to verify balances.

HKSA 540 covers estimates, which are among the most judgement-dependent items in financial statements. Provisions for bad debts, depreciation rates, fair value measurements, and inventory write-downs all require the auditor to challenge management's assumptions and gather evidence to assess whether the estimates are reasonable.

HKSA 560 deals with events after the balance sheet date but before the audit report is signed. If a material event occurs in this window, the auditor must assess whether it requires adjustment or disclosure in the financial statements.

HKSA 700 governs the auditor's report itself: the format, content, and the expression of an unmodified opinion. HKSA 705 covers situations where the auditor cannot give a clean opinion, and sets out the 3 types of modified opinion: qualified, adverse, and disclaimer of opinion. HKSA 706 covers emphasis of matter paragraphs, which draw attention to a specific disclosure in the financial statements without modifying the opinion.

What this means for Hong Kong companies

As a company director or owner, you are not required to understand the full technical detail of the HKSAs. That is your auditor's responsibility. However, you should know that:

1. Your auditor must remain independent: they cannot have financial or personal interests in your company
2. You must provide complete and accurate information when requested. Deliberately misleading an auditor is a serious breach
3. Your auditor will assess going concern: if your company has financial difficulties, this will be reflected in the audit report
4. The auditor will review related-party transactions: loans to directors, payments to connected parties, and similar arrangements require proper documentation. For guidance on maintaining the underlying records your auditor will review, see our bookkeeping and accounting guide
5. The audit report is relied on by the IRD, banks, investors, and regulators. It carries legal weight

Practical steps for directors

First, appoint your auditor early. Do not wait until the financial year has closed. Auditors need to plan their work in advance, and engaging them late compresses the timeline and increases cost.

Second, keep clean accounting records throughout the year. Auditors work from your books. If records are disorganised, incomplete, or rely on undocumented adjustments, the audit will take longer and cost more. The Companies Ordinance requires directors to ensure adequate accounting records are maintained.

Third, respond promptly to auditor requests. Under HKSA 230 and HKSA 500, auditors must gather sufficient evidence to support every material figure in the financial statements. Delayed responses to requests for invoices, contracts, or bank statements delay the audit and push you past the BIR51 filing deadline.

Fourth, document related-party transactions at the time they occur. Loans from directors, inter-company charges, and transactions with shareholders must be disclosed in the financial statements. Reconstructing the terms of these transactions months later is error-prone and raises questions.

Fifth, understand that the audit report has 3 possible outcomes: an unmodified opinion (clean), a modified opinion (qualified, adverse, or disclaimer), or an emphasis of matter paragraph highlighting a specific issue without modifying the opinion. A modified opinion or going concern emphasis in your audit report will be visible to the IRD, your bank, and any future investor.

Your company secretary coordinates the annual audit as part of the compliance cycle. For the full list of annual obligations, see our annual requirements guide.

Air Corporate provides audit and tax filing services for Hong Kong companies from USD 580/year. CPA-audited financial statements prepared in accordance with HKFRS and HKSAs. Get started

---