TL;DR: The first year of a new company has different compliance timing than subsequent years. Your first accounting period may be shorter or longer than 12 months, creating non-standard deadlines. The Filing Deadlines tool maps your specific first-year obligations.
When compliance guides talk about annual filing deadlines, they're usually describing the steady-state experience — a company that's been operating for a few years with a standard 12-month accounting period. But a company's first year is different in ways that catch founders off guard.
The first challenge is the length of the first accounting period. When you form a company mid-year, your first accounting period runs from the date of incorporation to the end of your chosen financial year. If you incorporate in July and choose a 31 March year end, your first accounting period is only 8 months long. If you choose a 30 June year end, it's 11 months. If you choose a 31 December year end, it could be only 5 months (if you incorporated in August). Some countries automatically set your first year end, giving you a shorter or longer first period depending on when you incorporated.
The second challenge is that in your first year, you don't yet have all the accounts, tax numbers, and registration confirmations you'll need for some filings — because they're all being set up simultaneously. The sequence of obtaining your company tax reference number, setting up payroll, registering for VAT/GST, and filing your first returns requires careful timing management.
Third, some countries have a "first annual return" or "first confirmation statement" due much sooner than founders expect. In the UK, the confirmation statement is due within 14 days of the company's incorporation anniversary — which means a company formed in January has a confirmation statement due in January of the following year, potentially before the company has even completed its first full year of trading.
The MmowW Scrib🐮 Filing Deadlines tool handles first-year complexity explicitly. When you enter a recent incorporation date, the tool generates a first-year-specific compliance calendar that accounts for:
First-year compliance sequence:
The tool presents first-year obligations in sequence, not just by date, because some filings depend on completing previous steps. For example, you can't file a corporation tax return without a tax reference number; you can't get a tax reference number until your company is registered; you can't register for VAT until you're registered as a company. Understanding this sequence prevents bottlenecks.
Use our free tool: Filing Deadlines
Try it free →James formed his UK Ltd on 15 September 2024. Companies House automatically set his accounting reference date to 30 September — making his first accounting period only 15 days long (15-30 September 2024). This is a quirk of UK company law: Companies House sets the initial accounting reference date to the last day of the month one year after incorporation, but the company's first full year then runs from 1 October 2024 to 30 September 2025.
The Filing Deadlines tool explains this clearly: James's accounts for the short first period (15-30 September 2024) are due by 31 December 2025 (15 months from incorporation, as first-year accounts have a longer deadline than subsequent years). His first full-year accounts (October 2024-September 2025) are due by 30 June 2026 (9 months after year end).
His first confirmation statement is due by 29 September 2025 — the day before his first anniversary. The tool maps both deadlines clearly.
An Australian Pty Ltd was incorporated on 20 March 2025. The ASIC annual review date is 20 March — the first review notice will arrive around 20 March 2026 (approximately 12 months after incorporation), with 28 days to pay the AUD $310 fee. The Filing Deadlines tool notes this date from the moment of entry, giving the founders a full year of advance notice.
The tool also flags that the company's first tax return will be for the period ending on their first balance date (which ASIC automatically sets to 30 June for new companies, unless changed) — so a company formed on 20 March 2025 has a first balance date of 30 June 2025, and the ATO expects a tax return for that short first period (20 March to 30 June 2025) to be filed by 31 October 2025 or later if using a tax agent.
A New Zealand company was incorporated on 1 May 2025. The founders chose an annual balance date of 31 March to align with the NZ government's financial year. Their first balance date will be 31 March 2026 — an 11-month first period.
The Filing Deadlines tool shows: first annual return due on 1 May 2026 (anniversary of incorporation, NZD $45 fee due). First income tax return for the 11-month period ending 31 March 2026, due by 7 July 2026 (standard 3-month extension from balance date when using a tax agent). GST returns (if registered) due bi-monthly from registration date.
| Country | First Accounting Period | First Year Accounts Deadline | First Annual Return | First Tax Return |
|---|---|---|---|---|
| UK | Set by CH to last day of month 1 year after incorporation | 21 months from incorporation (first year) | Within 14 days of first anniversary | 12 months after accounting period end |
| France | Chosen by founders (max 24 months first period) | Within 6 months of period end | N/A separately | Within 3 months of period end |
| Sweden | Chosen by founders | Within 7 months of period end | N/A separately | With annual accounts |
| Australia | Ends 30 June by default (unless changed) | By 31 October following balance date | First ASIC review ~12 months after incorporation | By 31 October (or later with agent) |
| New Zealand | Chosen by founders (any date) | Within 5 months of balance date | On anniversary of incorporation | Within 4 months of balance date |
| Canada | Chosen by founders (first period ≤53 weeks) | 6 months after period end | On anniversary of incorporation | 6 months after period end |
| USA | Chosen by founders (calendar or fiscal year) | State-specific | State-specific, often first March or April | 2.5-3.5 months after period end (federal) |
Sources: gov.uk, asic.gov.au, ird.govt.nz, canada.ca, irs.gov
Filing Deadlines is completely free — no signup required. Map your company's first-year compliance obligations from day one.
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MmowW Scrib🐮 is a document preparation service, not a law firm. This article is for informational purposes only and does not constitute legal advice. Consult a qualified attorney or accountant for advice specific to your situation.
Q: Can I change my company's accounting year end in the first year?
A: In most jurisdictions, yes. In the UK, you can change your accounting reference date before you file your first accounts, subject to certain rules (maximum first accounting period of 18 months; cannot extend without Companies House approval; can only shorten once per year under normal rules). Other jurisdictions have similar flexibility. Changing your year end in the first year can be useful if the automatically assigned date doesn't align with your business cycle. Consult a qualified accountant before making this change, as it can have tax implications.
Q: Do I need to file a tax return for a very short first period (e.g., 15 days)?
A: Generally, yes — a tax return is typically required for every accounting period, even a very short one. In practice, for a period of 15 days during which the company did no trading, the return will show zero income and zero tax liability, and no tax will be due. But the return itself must still be filed. Your accountant can typically handle a short-period return quickly and at lower cost than a full-year return. The Filing Deadlines tool flags first-period returns regardless of the period length.
Q: When should I register for VAT/GST? Is it part of my first-year compliance?
A: VAT/GST registration is required when your revenue exceeds the registration threshold in a given jurisdiction (£85,000 in the UK, AUD $75,000 in Australia, etc.) or from registration date if you choose to register voluntarily. In your first year, you may not reach the threshold — but if you expect to, you can register voluntarily from day one. Voluntary registration allows you to reclaim VAT/GST on business expenses from the start. The Filing Deadlines tool includes VAT/GST threshold monitoring as part of your first-year compliance planning.
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