Hong Kong Company Year-End: 31 March vs 31 December
Reviewed by Captime's licensed team (TCSP Licence TC010212) · Updated · Editorial policy
Learn how 31 March and 31 December Hong Kong company year-ends affect tax filing timelines, audit planning and which accounting date fits your business.
Key Takeaways
- A Hong Kong company’s financial year-end is based on its accounting reference date.
- Directors can specify the first accounting reference date, provided it falls within 18 months after incorporation.
- If directors do not specify a date, the statutory default is generally the last day of the month containing the first anniversary of incorporation.
- 31 March is common, but it is not compulsory.
- The year-end affects accounts, audit timing and the Profits Tax filing timetable, but not the company’s tax rate.
- For a local private company, the year-end does not reset the NAR1 or Business Registration Certificate renewal cycle.
- The accounting reference date can be changed later, subject to the Companies Ordinance.
Quick answer
A Hong Kong company does not have to use 31 March as its financial year-end; directors can choose an accounting reference date within the statutory rules.
31 March may offer a later Profits Tax filing timetable under the Block Extension Scheme, while 31 December often suits calendar-year or group reporting.
How to choose between 31 March and 31 December
The choice between 31 March and 31 December is mainly about tax filing timing, reporting alignment and administration. It does not change the Profits Tax rate or automatically create an offshore tax exemption, audit exemption or bookkeeping exemption.
For a newly incorporated Hong Kong company, the first accounting reference period begins on the incorporation date and ends on its primary accounting reference date. For example, a company incorporated on 10 June could use 31 December, creating a first period of roughly six and a half months, or the following 31 March, creating a period of roughly nine and a half months. Both can fall within the statutory framework.
A 31 March year-end can be attractive where the company does not need to match an overseas parent’s reporting date. For represented taxpayers eligible for the IRD Block Extension Scheme, a 31 March year-end generally falls under the M-code timetable, which can provide a later filing deadline than a 31 December D-code year-end. Exact extension dates are announced by the Inland Revenue Department for each year of assessment.
A 31 December year-end often works well for founders who manage their business on a calendar-year basis or need to align the Hong Kong company with an overseas parent or group reporting cycle. Using the same closing date across a group can simplify reconciliations, management reporting and consolidated accounts.
The financial year-end should be tracked separately from other Hong Kong compliance dates. For a local private company, Form NAR1 is generally due within 42 days after the incorporation anniversary, so changing the year-end does not change the NAR1 filing cycle. The Business Registration Certificate also follows its own validity and renewal cycle.
Directors can change the accounting reference date under section 371 of the Companies Ordinance. An extended accounting reference period cannot exceed 18 months, and further extensions within five years are restricted unless an applicable statutory exception applies. In practice, the timing of a change should be coordinated with the company’s accountant or auditor if work on the current period has already begun.
For most founders, the practical approach is to match an existing parent or group reporting date where one exists. Otherwise, 31 March may suit a company seeking the M-code Profits Tax filing timetable, while 31 December may be simpler for calendar-year reporting.
How Captime helps
Captime Corporate Management Limited (TCSP Licence No. TC010212) helps founders choose a practical financial year-end when setting up a Hong Kong company and organise the related accounting, audit and Profits Tax calendar. Captime can also help align the year-end with a parent company or reporting cycle and coordinate the steps where an existing accounting reference date needs to be changed.
Official references
- Hong Kong Companies Registry — Accounts and Audit FAQ
- Hong Kong Companies Ordinance (Cap. 622)
- Inland Revenue Department — Profits Tax
- Companies Registry — Annual Return Requirements for Local Private Companies
- Inland Revenue Department — Renewal of Business Registration
Comparison Table
31 March vs 31 December
| Factor | 31 March | 31 December |
|---|---|---|
| Typical fit | Companies seeking the M-code Profits Tax filing timetable | Calendar-year or group reporting |
| 10 June incorporation example | First period about 9.5 months | First period about 6.5 months |
| Reporting alignment | Common Hong Kong year-end | Useful for calendar-year or overseas parent reporting |
| Profits Tax filing timetable | Generally M code under the IRD Block Extension Scheme | Generally D code under the IRD Block Extension Scheme |
| NAR1 deadline affected? | No | No |
| BRC renewal affected? | No | No |
| Creates tax or audit exemption? | No | No |
Frequently Asked Questions
No. 31 March is common, but it is not compulsory. Directors can specify another accounting reference date as long as the company complies with the Companies Ordinance, including the rules governing its first accounting reference period.
The directors can specify the company’s primary accounting reference date within 18 months after incorporation. If they do not specify one, the statutory default is generally the last day of the month containing the first anniversary of incorporation.
Yes. For a newly incorporated company, the first accounting reference period runs from incorporation to the first accounting reference date. It can therefore be shorter or longer than 12 months, subject to the statutory maximum period.
Neither is automatically better. 31 March may suit companies seeking the M-code Profits Tax filing timetable, while 31 December often suits calendar-year accounts or companies that need to match an overseas parent’s reporting period.
No. For a local private company, Form NAR1 is generally due within 42 days after the incorporation anniversary. The annual return cycle is therefore separate from the company’s accounting reference date.
No. The Business Registration Certificate (BRC) follows its own validity and renewal cycle. Changing the accounting reference date does not reset the BRC renewal date, so founders should track the two deadlines separately.
Yes. Directors can alter the accounting reference date under section 371 of the Companies Ordinance. An extended accounting reference period cannot exceed 18 months, and repeated extensions are subject to additional statutory restrictions.
No. Choosing 31 March mainly affects reporting and filing timing. It does not by itself reduce the Profits Tax rate, create offshore status, remove bookkeeping obligations or provide an audit exemption.
Video transcript
Read the full transcript
You incorporated in June, you sold a bit, ignored the books, and in November, someone says, we need accounts to 31st March. You think, we haven't even been alive for a year. Here's what happened. That date was chosen when the company was formed. You just weren't in the meeting. Your year end was set at incorporation, and most founders meet it at audit. In the next few minutes, what that date changes, what it doesn't, how to pick between the two usual choices, and whether it's too late if you already hate yours. Every Hong Kong company has a year end. The law calls it the accounting reference date, and I'll use that term once so it's on the record.
Under section 369 of the company's ordinance, chapter 622, the directors set it, and it must fall within 18 months of incorporation. If nobody sets one, the default is the last day of the month of your first anniversary, for a June company, 30th June. In practice, the date is usually set at formation, in the incorporation paperwork. The two most common choices across Hong Kong are 31st March and 31st December, and it's easy to sign without noticing. So, did someone already pick your year end? Almost certainly yes. Is 31st March the legal requirement? No, it's a common choice, not the law. And a 15-second correction. Hong Kong's government runs its fiscal year 1st April to 31st March.
That has nothing to do with your company's date. Yours can be anything. Your first accounts period starts on your incorporation date, not 1st January, and ends on that year end, which is why accounts to March feels wrong for a June company. Your first period isn't 12 months, it's whatever the gap is, shorter or longer, capped at 18 months from incorporation. That's normal and expected. It also explains the timing shock. Your first profits tax return arrives roughly 18 months after incorporation regardless. Our first tax return video covers that envelope. So the year end you didn't know about quietly decides how ready you are when it lands. Same Shopify business.
Two founders, both incorporated on the 10th of June. Founder A's provider set 31st March. First accounts, 10th June to 31st March, about 9 and a half months. Every year after, the close lands in the March rush. Auditors are at their busiest because half of Hong Kong closes the same day. The tax timetable is the most generous of any year end. With a tax representative, the return can run to mid-November, which feels like a gift until April becomes a pileup of everyone's deadlines at once. Founder B chose 31st December because the US parent and the Stripe reports already closed then. First accounts, 10th June to 31st December, a short 6 and a half month year.
After that, one close serves the group and Hong Kong. The auditor works in January and February when they're less swamped and the tax timetable is tighter than March's, around mid-August with a representative. Same company, different date, different year one pain. And that's all the IRD's N, D, and M codes are, by the way. Labels for how your tax deadline moves after the year end you picked. Nothing more to learn here. One sentence founders get wrong constantly. Your year end moves two things, the audit, the accounts are made up to that date, and the profits tax return timetable that follows it. It does not move the NAR1 annual return, which runs off your incorporation anniversary.
It does not move the business registration certificate, which runs off the certificate's own expiry. Year end, NAR1, BRC, three clocks, and this video is only about the first. And the year end changes only timing. It creates no audit exemption, no offshore status, and no bookkeeping holiday. If you're choosing or re-choosing four lines. Do you have a parent company or a marketplace pack that already closes on a date? Use that date. One close beats two. No parent, you live overseas, and you want maximum time after year end before the tax deadline, 31st March. No parent, and you already think in calendar years, 31st December.
Might close the company within a year, don't overthink it, either is fine. Don't invent a clever fourth date unless a group already closes on it. Three honest answers. If your first year end hasn't passed yet, you can usually still set it properly. Tell your secretary now. If you've already closed and filed once, you can still change it by director's resolution under section 371 of the company's ordinance, chapter 622. But it's no longer a free default. The new period can't exceed 18 months, and if you're extending, you generally can't do it again within five years unless you're aligning with a parent or the members approve. Private companies file nothing at the company's registry for this.
The Inland Revenue Department simply sees the new date in your next accounts. And if the auditor is already asking for this year's file, you finish this year on the current date. You decide the next one. Changing is paperwork. Not always easy, but never a trap. The facts in 20 seconds. Your year end was set at incorporation, usually by your provider, within 18 months, under section 369 of the company's ordinance, chapter 622. 31st March is common, not compulsory. Your first period runs from incorporation and can be short or long. Year end moves the audit and the tax return. It never moves the NAR1 or the BRC. Match a parent if you have one.
Otherwise, March for time, December for calendar thinking. Changing later is a director's resolution. Possible, not casual. Tell your company secretary the year end at setup, not at audit. At Captime Corporate Management Limited, a licensed TCSP, license number TC010212, we set the date with you at incorporation and keep your audit and tax calendar on it from day one. hk or use the link in the description. No credit card, no obligation. Thank you for watching. If this helped, give it a like and subscribe to Accurate, hype-free guides to running a Hong Kong company. See you in the next video.
Related Captime services
Ready to start your Hong Kong company?
Book a free consultation with our team — we'll walk you through it.


