Hong Kong Company Tax Filing Guide: 2025/26 Year of Assessment Process, Fees, and Deadlines at a Glance

Every year, every Hong Kong company must submit a Profits Tax Return to the Inland Revenue Department — this is something directors and shareholders cannot avoid. Getting clear on the filing process, key deadlines and fee structure first is the only way to avoid penalties and reduce your tax burden within the law.

Hong Kong Company Tax Filing: The Basic System

Hong Kong applies the territorial source principle: only profits arising in or derived from Hong Kong are taxable. Profits Tax operates under a two-tier rates regime: the first HK$2 million of assessable profits is taxed at 8.25%, and the portion above HK$2 million at 16.5% (see the IRD's guide to the two-tier Profits Tax rates). Even if a company has not generated any assessable profits or is running at a loss, it must still file on time — though no tax is payable.

The year of assessment runs from April 1 to March 31 of the following year. The Inland Revenue Department normally issues Profits Tax Returns (BIR51 or BIR52) for that year on the first working day of April.

Filing Process and Key Deadlines

Step 1: Receiving the Tax Return

A newly incorporated company must file within 3 months from the issue date of the return; a company already in business is normally given a 1-month deadline. Appointing a tax representative allows the company to apply for an extension. The common extended deadlines are:

• Financial year-end of 31 December: extension to 15 August of the following year
• Financial year-end of 31 March: extension to 15 November of the same year
• Other year-ends: extension to 30 April of the following year

Step 2: Preparing the Audit Report

Hong Kong's Companies Ordinance requires the financial statements of all limited companies to be audited by a certified public accountant (CPA), and the tax return must be submitted together with the audit report (audit). An audit typically takes 2 to 4 weeks, so time must be built in before the deadline.

Step 3: Completing and Submitting the Tax Return

The company must complete the Profits Tax Return (BIR51) and submit it to the Inland Revenue Department by the deadline, together with the audit report, the Profits Tax computation and any supplementary forms (S1-S10, depending on the nature of the business).

Documents Required for Filing and Fee Estimates

Documents to Prepare

• Audited financial statements (balance sheet and profit and loss account)
• Profits Tax computation
• Original Profits Tax Return BIR51
• Relevant supplementary forms (where applicable)

Fee Estimates (HKD)

Filing-related costs come mainly from accounting and audit services, and vary with the company's turnover and transaction volume. For the overall cost structure of company formation and operations, see the full guide to Hong Kong company registration fees:

These are market reference prices; actual fees depend on the number of transactions, industry complexity and the size of the accounting firm.

The Relationship Between Audit and Tax Filing

Tax filing for Hong Kong companies cannot be separated from the audit. Even if a company is dormant, as long as it has not been formally deregistered, an audit is in principle still required. If a tax return is submitted without an audit report, the Inland Revenue Department may refuse to process it and raise an estimated assessment, and the company may end up paying more tax than it should.

If a tax return is not filed by the deadline, the Inland Revenue Department may impose a penalty starting at HK$1,200; continued non-compliance can lead to prosecution, with fines of up to HK$10,000 plus an additional penalty equal to three times the amount of tax undercharged.

Frequently Asked Questions (FAQ)

Q1: Does a Hong Kong company with no operations still need to file a tax return?

Yes. Even if a company has had no business for the entire year, it must still submit its tax return and audit report on time. It can consider applying for “dormant company” status, but this requires meeting specific conditions and filing with the Companies Registry.

Q2: Does the two-tier Profits Tax regime apply to all companies?

The two-tier rates apply to standalone corporations with no connected entities. If a company has connected entities, only one among all of the connected entities may enjoy the two-tier rates concession.

Q3: Are offshore profits subject to Hong Kong Profits Tax?

Hong Kong applies the territorial source principle, and profits purely sourced from outside Hong Kong may be claimed as exempt. The company must provide evidence such as transaction documents and meeting records to prove that the profits were sourced outside Hong Kong; the Inland Revenue Department examines each case individually.

Q4: What if my extension application is rejected?

If the extension application is rejected, the company must submit its tax return by the original deadline. If the audit genuinely cannot be completed in time, the company may submit the tax return first with an explanatory letter attached, undertaking to provide the audit report afterwards; the Inland Revenue Department usually handles such cases with discretion.

Q5: File by yourself or engage a professional firm?

If the company's business is simple and its transaction volume is low, it can do its own bookkeeping and engage an auditor to handle the audit. Most companies engage an accounting firm to handle the full tax filing package, for the sake of compliance and time savings. Many firms in the market offer tax filing and audit services for Hong Kong companies; it is advisable to compare at least three and confirm the scope of services covered by the quote before deciding. Related company formation and operating costs are also worth reviewing.

After the year of assessment ends, organising your accounts early and booking your auditor in advance is far safer than leaving everything until just before the deadline. Filing on time is the only way to keep your company's tax compliance record clean.