Business Tax Calendar by Country: Key Dates You Can't Miss
Tax & Compliance Series
This guide is part of a comprehensive series. Explore all 202 topics:
Missing tax deadlines costs businesses thousands in penalties and interest every year. Whether you operate in one country or across borders, knowing your key dates is essential for staying compliant and avoiding fines.
This calendar covers the most important tax dates for small businesses in five major markets.
United States (IRS)
For detailed US compliance, see our IRS compliance guide.
For detailed US compliance, see our IRS compliance guide.
Key Annual Dates
- January 15: Q4 estimated tax payment due
- January 31: W-2s and 1099s due to recipients
- March 15: S-Corp and Partnership returns due (Form 1120-S, 1065)
- April 15: Individual and sole proprietor returns due; Q1 estimated payment
- June 15: Q2 estimated tax payment due
- September 15: Q3 estimated tax payment; extended S-Corp/Partnership returns due
- October 15: Extended individual returns due
Sales Tax
Sales tax deadlines vary by state—monthly, quarterly, or annually depending on volume.
United Kingdom (HMRC)
Read our detailed HMRC MTD compliance guide.
Read our detailed HMRC MTD compliance guide.
Key Annual Dates
- January 31: Self-assessment return and balancing payment due; first payment on account
- April 5: End of UK tax year
- April 6: Start of new tax year
- July 31: Second payment on account due
- October 5: Deadline to register for self-assessment (new businesses)
- October 31: Paper self-assessment deadline
VAT
VAT returns are due quarterly, one month and seven days after the quarter ends. Making Tax Digital requires digital submission.
Nigeria (FIRS)
See our FIRS Nigeria compliance guide.
See our FIRS Nigeria compliance guide.
Key Annual Dates
- January 31: Annual income tax return for individuals
- June 30: Companies income tax return (6 months after year-end)
- Monthly (21st): VAT returns due
- Monthly (10th): PAYE remittance due
- Annually: Withholding tax returns
Canada (CRA)
Read our CRA compliance guide.
Read our CRA compliance guide.
Key Annual Dates
- March 15: Quarterly instalment payment (Q1)
- April 30: Individual income tax return due
- June 15: Self-employed individuals' return due; Q2 instalment
- September 15: Q3 instalment payment
- December 15: Q4 instalment payment
- Six months after year-end: Corporate tax return due
GST/HST
Filing frequency depends on revenue: annual, quarterly, or monthly.
Australia (ATO)
See our ATO compliance guide.
Key Annual Dates
- July 1: Start of Australian financial year
- October 31: Individual tax return due (self-lodging)
- February 28: Q2 BAS (Business Activity Statement) due
- April 28: Q3 BAS due
- July 28: Q4 BAS due
- October 28: Q1 BAS due
Tips for Managing Tax Deadlines
Tips for Managing Tax Deadlines includes: Set calendar reminders: 2 weeks and 1 week before each deadline Automate payments: Set up direct debits where available
- Set calendar reminders: 2 weeks and 1 week before each deadline
- Automate payments: Set up direct debits where available
- Keep records current: Monthly financial reviews prevent year-end scrambles
- Use accounting software: Invoicemonk tracks deadlines and generates reports
- Hire a professional: For complex or multi-country situations
Related Resources
More in this series (202 articles)
From this series
Stay audit-ready and compliant with tax regulations across different regions.
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