• Online self-assessment tax return filing deadline 

• 2024/25 tax payment due 

• 2025/26 first payment on account due.

Canadian instalment tax payment due (first quarter)

Cessation of UK tax year. Due date for various year-end tax planning.

Commencement of UK tax year, some UK tax certificates commence to be issued

US extension (Form 4868) payment and filing due date to extend US tax return (US) 

US estimate tax payment due (first quarter)

US tax return filing due date for taxpayers 

Filing Deadline for Form T1135 – Foreign Income Verification Statement (CDN)

Payment due date for Canadian self-employed tax and non-resident rental tax returns (CDN)

Filing deadline for Form T1161 – List of Properties by and Emigrant of Canada (CDN)

Filing deadline for Form T2091 - Designation of a Property as a Principal Residence by an Individual (CDN)

Canadian personal tax return (other than self-employed and s.216 tax returns) filing due date: no extension of time to file/pay (CDN)

Copies of UK Payroll statements Forms P60 issued to employees

Canadian self-employed tax returns filing due date (CDN)

US tax return filing due date for taxpayers living abroad on April 15, 2025 (US)

Canadian instalment tax payment due (second quarter)

US estimated tax payment due (second quarter)

Canadian non-resident rental tax return filing due date with NR6 form approval (CDN)

Copies of UK Benefit and Expenses statements Forms P11D issued to employees

Second payment on account due for tax year 2025/26

US estimated tax payment due (third quarter) (US)

Canadian instalment tax payment due (third quarter)

Date to register with HMRC if you became self employed during the tax year

US estimated tax payment due (fourth quarter)

US tax return filing due date for extended returns (US)