Once your Hong Kong company is registered and trading, one of your most important annual obligations is filing the Profits Tax Return (PTR) with the Inland Revenue Department (IRD). Unlike in many other jurisdictions, filing is not optional even if you made a loss, have zero revenue, or operate entirely outside Hong Kong. If the IRD issues you a return, you must file it — by the deadline, with the right documents, in the right format.
This guide explains the filing deadlines for 2026, what documents you need to prepare, how to submit using eTAX or paper, and what happens if you miss the deadline.
Key Filing Deadlines by Company Year-End
Hong Kong's tax year runs from 1 April to 31 March. The IRD issues Profits Tax Returns in bulk on the first working day of April each year — for the 2025/26 year of assessment, approximately 270,000 returns were issued on 1 April 2026.
The standard deadline is one month from the date of issue. However, actual deadlines vary depending on your company's financial year-end, whether you have a tax representative, and whether you file electronically.
The IRD uses three year-end codes to organise filing deadlines:
N Code — Year-end between 1 April and 30 November:
Standard deadline: approximately 2 June 2026 (one month from issue, adjusted for public holidays).
eTAX extension: one further month upon application — approximately 2 July 2026.
Block extension (with tax representative): may extend to August 2026 for loss cases.
D Code — Year-end between 1 December and 31 December:
Standard deadline: approximately 2 June 2026.
eTAX extension: one further month upon application — approximately 2 July 2026.
Block extension (with tax representative): extended deadline typically to mid-August 2026, or 15 September 2026 with eTAX filing.
M Code — Year-end between 1 January and 31 March (most common for SMEs with a 31 March year-end):
This is the most generous category. Standard deadline: approximately 2 June 2026.
Block extension (with tax representative): typically to mid-November 2026.
eTAX block extension: typically to 15 December 2026.
For first-time filers:
Your first PTR is typically issued around 18 months after your incorporation date. For example, a company incorporated on 1 January 2025 will typically receive its first PTR around June 2026. The deadline for the first PTR is four months from the date printed on the return — more generous than the standard one-month window.
2025/26 one-off tax reduction:
The 2026/27 Budget proposed a one-off 100% reduction in profits tax for the year of assessment 2025/26, subject to a cap of HKD 3,000 per case. This reduction will be reflected in IRD assessments once the relevant bill is passed by the Legislative Council. File your return as normal — the reduction will be applied automatically at the assessment stage.
Important: if you do not receive a PTR but your company has taxable profits, you are still legally required to notify the IRD. Waiting for a return to arrive before acting is not a valid defence against late filing.
Documents You Need to Prepare
The PTR itself is a form — but you cannot complete it without the underlying financial documents. Getting these ready before the return arrives saves significant time and stress.
Core documents required:
Audited financial statements: your profit and loss account and balance sheet for the relevant financial year, audited by a licensed Hong Kong CPA. This is mandatory for all active limited companies and must comply with Hong Kong Financial Reporting Standards (HKFRS) or the SME Financial Reporting Framework (SME-FRF) if eligible. You cannot file your PTR properly without completed audited accounts.
Tax computation: a formal schedule showing how your assessable profits are calculated from the accounting profit, after adding back non-deductible items (entertainment, depreciation, private expenses) and deducting allowable items (capital allowances, approved charitable donations, qualifying deductions). This is typically prepared by your CPA or accountant alongside the audit.
Supplementary forms: depending on your business activities, you may need to complete one or more supplementary forms alongside the main PTR. Common ones for SMEs include:
- Form S1: profits from trade or business
- Form S3: offshore income exemption claims (if applicable)
- Form S11: tax concession claims
From the year of assessment 2020/21 onward, all supplementary forms must be submitted electronically via the IRD's Business Tax Portal (BTP) or Tax Representative Portal (TRP), regardless of whether the main PTR is filed on paper or electronically.
Supporting documents (for IRD queries, not routinely submitted):
- Bank statements for the relevant period
- Sales invoices and purchase records
- Payroll records and MPF contribution statements
- Contracts and agreements relevant to major transactions
- Evidence of offshore profits (if claiming offshore tax exemption)
Nil return:
If your company had no business transactions during the period, you may file a NIL PTR. However, this applies only to companies that have genuinely not commenced business — not to companies with offshore operations or zero Hong Kong revenue but active trading elsewhere. Filing a NIL return incorrectly is a common and serious error that can trigger IRD investigation.
How to File: Paper vs eTAX
The IRD strongly recommends electronic filing through eTAX, and from 1 April 2026, mandatory e-filing came into effect for the first phase of eligible filers. For most SMEs, e-filing is not yet mandatory but is the preferred and increasingly standard route.
Filing via eTAX (recommended):
The IRD's eTAX system — accessible through the Business Tax Portal (BTP) at btp.ird.gov.hk — allows you to:
- File Form BIR51 (corporations) or BIR52 (partnerships) online
- Upload supplementary forms in XML format
- Attach audited financial statements and tax computation
- Sign the return electronically using iAM Smart (for individual directors with digital signing enabled) or an IR1476 authorisation form if a tax representative is filing on your behalf
- Receive an automatic acknowledgement of submission
- Apply for the one-month eTAX extension (where eligible)
Key advantage: eTAX filers who submit voluntarily with iXBRL financial statements are eligible for a further one-month extension on application. Mandatory e-filers (MNE groups) receive this extension automatically.
Filing on paper:
Paper forms BIR51 (corporations) or BIR52 (partnerships and sole proprietors) can be downloaded from the IRD website or collected from the IRD's offices. Completed returns must be submitted to the IRD at:
Revenue Tower, 5 Gloucester Road, Wan Chai, Hong Kong
Or sent by post (ensure sufficient postage — the IRD will not accept underpaid mail items).
Paper filing does not qualify for the eTAX extension. If your standard deadline is one month from issue, filing on paper means you must submit within that window with no additional time.
Practical recommendation for SMEs:
Register for a Business Tax Portal (BTP) account and file electronically. It is faster, provides an immediate submission record, and qualifies you for the eTAX extension. If you use an accountant or tax representative, they will typically file through the Tax Representative Portal (TRP) on your behalf under the Block Extension Scheme — giving you the longest possible deadline.
Penalties for Late Filing
Hong Kong's penalty regime for late PTR filing is straightforward but escalates quickly if left unaddressed.
Penalty surcharge on estimated tax:
If you file late and the IRD has issued an estimated assessment, a 5% surcharge is added to the unpaid tax. If the tax remains unpaid for six months, an additional 10% surcharge is applied. These surcharges apply to the estimated tax amount — which the IRD sets conservatively high to encourage prompt filing.
Criminal offence:
Failure to file a PTR when issued is a criminal offence under the Inland Revenue Ordinance. Upon conviction, the penalty is a fine up to HKD 10,000, plus a further fine equal to three times the amount of tax undercharged. Directors and principal officers can be held personally liable.
Prosecution and investigation risk:
Persistent non-filing — particularly for companies that have been trading — attracts IRD investigation. The IRD compares data from multiple sources: bank suspicious transaction reports, supplier and client filings, and Companies Registry records. Companies that file NIL returns while their counterparties have reported payments to them are at high risk of audit.
How to handle a missed deadline:
If you have missed your filing deadline, act immediately — do not wait. File as soon as your accounts and tax computation are ready. For first-time late filings, the IRD generally accepts a completed return and processes the estimated assessment downward to reflect actual profits. Engaging a tax representative to liaise with the IRD on your behalf is advisable if the lateness is significant or if multiple years are outstanding.
Let SMEBro Handle Your Tax Filing
Preparing audited accounts, completing the tax computation, filing supplementary forms electronically, and meeting the correct deadline for your year-end code is a lot to manage alongside running your business.
SMEBro provides end-to-end tax compliance support for Hong Kong SMEs:
- Accounting and bookkeeping — clean records from day one
- Statutory audit by a licensed CPA — from HKD 1,999/year
- Profits Tax Return preparation and filing — PTR, tax computation, supplementary forms
- IRD liaison — late filings, estimated assessments, extension applications
- Tax problem handling — back-taxes, penalty reduction, investigation support
