🇮🇳India
15 Sep 2026
Advance Tax — 2nd Installment Soonest
Cumulative 45% of estimated annual tax liability due for anyone whose tax after TDS exceeds ₹10,000.
🇺🇸USA
15 Sep 2026
Q3 2026 Estimated Tax Payment Due
Third-quarter estimated tax payment deadline for self-employed individuals and those with income not subject to withholding.
🇨🇦Canada
15 Sep 2026
Q3 2026 Tax Instalment
Third quarterly instalment for taxpayers required to pay by instalments rather than a lump sum at filing time.
🇬🇧United Kingdom
5 Oct 2026
Register for Self Assessment
Deadline to register with HMRC for Self Assessment if you're newly self-employed or have new untaxed income for the 2025/26 tax year.
🇦🇺Australia
31 Oct 2026
Tax Return Lodgment Deadline (Self-Lodgers)
Standard deadline for individuals lodging their own return via myTax for the FY 2025-26 financial year. Registered tax agents often get an extended deadline.
🇸🇬Singapore
30 Nov 2026
Corporate Tax Return Filing (Form C-S/C-S Lite/C)
Deadline for companies to file their Corporate Tax Return for YA2026 via the myTax Portal.
🇦🇪UAE
Ongoing
Corporate Tax Return Filing & Payment
Due within 9 months of a business's financial year-end — the exact date depends on each company's own accounting period, so there's no single fixed date across all businesses.
Why Tax Deadlines Differ So Much Between Countries
It's tempting to assume every country runs on the same calendar-year cycle the way the US, Canada, UAE, and Singapore broadly do — but several major economies deliberately use a different tax year entirely:
| Country | Tax Year | Main Individual Filing Deadline |
|---|---|---|
| 🇮🇳 India | 1 April – 31 March | 31 July (non-audit cases) |
| 🇺🇸 USA | 1 January – 31 December | 15 April |
| 🇬🇧 UK | 6 April – 5 April | 31 January (online) |
| 🇨🇦 Canada | 1 January – 31 December | 30 April |
| 🇦🇪 UAE | No personal income tax | Not applicable for individuals |
| 🇦🇺 Australia | 1 July – 30 June | 31 October (self-lodgers) |
| 🇸🇬 Singapore | 1 January – 31 December | 15 April |
India and Australia's April-to-March and July-to-June tax years both trace back to British colonial-era administrative calendars, still in use today. The UK's unusual 6 April start date is a historical artifact of the switch from the Julian to Gregorian calendar in 1752 — genuinely one of the odder quirks in global tax administration.
How to Use This Calendar
- Bookmark this page — we update the "next deadline" for each country as dates pass, so it stays a reliable single reference point rather than something you need to re-derive each time.
- Click through to the full country calendar for the complete year of dates, including quarterly instalments, business filing deadlines, and payroll compliance dates specific to that country.
- Always verify with the official source linked for each country before treating a date as final — extensions and revisions happen more often than most people expect.
Frequently Asked Questions
Why do tax deadlines differ so much between countries?+
Each country sets its own tax year and administrative calendar independently. India and Australia use a financial year running April to March or July to June, the UK runs April to April, while the US, Canada, UAE, and Singapore tax individuals on a calendar year — leading to genuinely different filing windows.
Do tax deadlines ever get extended?+
Yes, in several countries — notably India, where the CBDT has extended the ITR deadline in multiple recent years. Extensions are typically announced close to the original date and should never be assumed in advance.
Which country has the most complex tax calendar?+
India and the US arguably have the most moving parts for individuals, due to advance tax/estimated tax instalment systems running alongside the main filing deadline. The UAE has the least fixed structure, since Corporate Tax deadlines depend entirely on each business's own financial year.