How to File a Hong Kong Profits Tax Return: Step-by-Step

Filing your Hong Kong Profits Tax Return (Form BIR51) is a mandatory annual obligation for every corporation in Hong Kong. The return must be submitted to the Inland Revenue Department (IRD) within one month of the issue date, unless an extension is granted. This guide provides a definitive, step-by-step process based on the Inland Revenue Ordinance (Cap. 112) and IRD practice notes.

Under section 51(1) of the Inland Revenue Ordinance (Cap. 112), "a person chargeable to tax under this Ordinance shall, when required by notice in writing by an assessor, furnish a return in the specified form."

1. ELIGIBILITY: Who Must File a Profits Tax Return?

Every corporation carrying on a trade, profession, or business in Hong Kong must file a Profits Tax Return (BIR51), regardless of whether it made a profit or loss during the year of assessment.

The IRD issues BIR51 forms to all active companies on the first working day of April each year. You are required to file if:

• Your company is incorporated in Hong Kong and is not dormant (i.e., it has not notified the IRD of dormancy under section 5(1) of the Business Registration Ordinance (Cap. 310)).
• Your company is registered as a foreign company under the Companies Ordinance (Cap. 622) and carries on business in Hong Kong.
• Your company has received a notice from the IRD to file a return, even if you believe no tax is payable.

Exemptions: A company that has ceased business and notified the IRD, or a company that has been granted "dormant" status by the Companies Registry and IRD, may not need to file. However, you must formally apply for this status—you cannot simply ignore the return.

2. TIMELINES: Key Deadlines and Extensions

The standard deadline is one month from the date of issue of the BIR51. However, the IRD grants automatic extensions to companies with accounting year-ends between 1 December and 31 December, and to those using tax representatives.

The IRD's extension schedule is published annually. For the year of assessment 2024/25 (returns issued in April 2025), the deadlines are as follows:

Note: If your company has a year-end of 31 December, you must file your Profits Tax Return by 15 August 2025 (without a tax representative) or 15 November 2025 (with a recognised tax representative). These dates are subject to change—check the latest IRD announcement.

If you cannot meet the deadline, you must apply for an extension in writing before the due date. Late filing without a valid reason incurs penalties under section 80(2) of the Inland Revenue Ordinance (Cap. 112).

3. COST METRICS: Fees, Penalties, and Professional Charges

The Profits Tax Return itself is free to file. However, late filing penalties start at HKD 1,200 and escalate to HKD 10,000 plus three times the tax undercharged if you fail to file within the specified period.

Important: The IRD does not charge a filing fee. However, if your company's turnover exceeds HKD 5,000,000, you must submit audited financial statements with your return. This means you will need to engage a Certified Public Accountant (CPA) for both the audit and the tax computation.

Ongoing Compliance Execution

Ongoing statutory obligations are handled seamlessly through Captime's dedicated Hong Kong company secretary service, providing a licensed local representative and automated annual return management.

4. SUITABILITY: Who Is This Process For?

This filing process applies to all active Hong Kong companies, but the complexity of your return depends on your turnover, business structure, and whether you claim offshore profits.

Not suitable for: Companies that have ceased trading and wish to be deregistered—these must first notify the IRD and obtain a "Notice of No Objection to Deregistration" before filing a final return.

5. STEP-BY-STEP FILING PROCESS

1. Prepare your financial statements: Close your books for the year of assessment. If your turnover exceeds HKD 5,000,000, arrange for a CPA to audit your accounts. If not, prepare unaudited accounts.
2. Prepare the tax computation: Reconcile accounting profit to assessable profit. Add back non-deductible expenses (e.g., entertainment, depreciation) and deduct allowable expenses (e.g., capital allowances, donations to approved charities).
3. Complete Form BIR51: Fill in the return. You must declare your business registration number, accounting period, turnover, and assessable profits. Attach the audited or unaudited financial statements and the tax computation.
4. File via eTAX (recommended): Log in to the IRD's eTAX system using your company's Business Registration number and IRD user ID. Upload the return and supporting documents electronically. You will receive an instant acknowledgement.
5. File by paper (alternative): Complete the paper BIR51 and mail it to the IRD at 15/F, Revenue Tower, 5 Gloucester Road, Wan Chai, Hong Kong. Keep a copy of the return and proof of postage.
6. Receive the assessment: The IRD will issue a Notice of Assessment (Form BIR51A) within 3–6 months. This states your tax payable (if any). Profits tax is charged at 16.5% for corporations (8.25% on the first HKD 2,000,000 of assessable profits, subject to the two-tiered rate).
7. Pay the tax: Pay the assessed tax within the due date stated on the Notice of Assessment (usually 30 days from issue). Payment methods include PPS, eTAX, bank transfer, or cheque.

6. COMMON PITFALLS AND HOW TO AVOID THEM

6.1 Missing the Deadline

The single most common error is missing the one-month filing deadline. The IRD does not send reminders. Mark the deadline in your calendar immediately upon receiving the BIR51. If you need more time, apply for an extension in writing before the due date.

6.2 Filing Without Supporting Documents

The IRD requires financial statements and a tax computation to be attached to the BIR51. Filing the return alone—without these attachments—is considered an incomplete filing and will be rejected. Ensure your CPA prepares both documents before you submit.

6.3 Incorrectly Claiming Offshore Profits

Claiming that your profits are sourced offshore (and therefore not taxable in Hong Kong) requires rigorous evidence. The IRD scrutinises these claims. You must demonstrate that the operations generating the profits occurred entirely outside Hong Kong. If you are unsure, seek professional advice before filing.

6.4 Ignoring the Two-Tiered Tax Rate

The two-tiered profits tax rate applies only to one entity within a group. If your company is part of a group, only one entity can claim the 8.25% rate on the first HKD 2,000,000. The IRD requires you to nominate which entity claims the concession. Failing to do so may result in reassessment.

7. FILING VIA eTAX: A CLOSER LOOK

The IRD's eTAX system is the fastest and most reliable method for filing your Profits Tax Return. It provides instant acknowledgement and reduces the risk of postal delays.

To use eTAX:

1. Register for an eTAX account using your Business Registration number.
2. Activate your account via the activation code sent by the IRD.
3. Log in and select "Profits Tax Return" under the "Tax Filing" menu.
4. Complete the online form and upload your financial statements and tax computation as PDF files.
5. Submit and download the acknowledgement receipt.

Note: eTAX is available 24/7, but the system is closed for maintenance on Sundays from 6:00 AM to 8:00 AM. Plan your filing accordingly.

8. WHAT HAPPENS AFTER YOU FILE?

After filing, the IRD will process your return and issue a Notice of Assessment. If you have no tax payable, you will receive a "Nil Assessment." If tax is payable, you must pay within the due date.

The IRD may also select your return for "field audit" or "investigation." This occurs when the return appears incomplete, inconsistent, or when the IRD suspects under-declaration. If selected, you will receive a written notice requesting further information. Respond promptly and provide all requested documents.

9. FREQUENTLY ASKED QUESTIONS

Q: What is the deadline for filing my Profits Tax Return if my accounting year-end is 31 December? A: If your accounting year-end is 31 December, the deadline is 15 August of the following year (without a tax representative) or 15 November (with a recognised tax representative). Check the latest IRD announcement for confirmation.

Q: Do I need to file a Profits Tax Return if my company made a loss? A: Yes. You must file a return even if you made a loss. The loss can be carried forward to offset future profits under section 19C of the Inland Revenue Ordinance (Cap. 112).

Q: What is the penalty for filing late? A: The first late filing incurs a penalty of HKD 1,200. Subsequent offences incur penalties of HKD 3,000 to HKD 10,000. If the case goes to court, you may face a fine of up to HKD 10,000 plus three times the tax undercharged.

Q: Can I file my Profits Tax Return without audited accounts? A: Yes, if your turnover is HKD 5,000,000 or less. If your turnover exceeds HKD 5,000,000, you must submit audited financial statements prepared by a Certified Public Accountant.

Q: What is the current profits tax rate? A: The two-tiered rate is 8.25% on the first HKD 2,000,000 of assessable profits and 16.5% on the remainder. Only one entity in a group can claim the lower rate.

10. CONCLUSION AND NEXT STEPS

Filing your Hong Kong Profits Tax Return is a structured, deadline-driven process. Prepare your financial statements early, engage a CPA if your turnover exceeds HKD 5,000,000, and file via eTAX to minimise errors.

If you are unsure about any aspect of your return—particularly regarding offshore claims, group structures, or capital allowances—consult a Hong Kong tax professional before the deadline. The cost of professional advice is far lower than the penalties for incorrect filing.

-> Use the HSIC Code Finder at /hsic-finder to look up your specific code.