The table below contains the key dates for financial calendar 2015 2016.

Year Date Financial importance
2015 January 1st New Years Day Bank Holiday
January 14th Corporation tax Self-Assessment payment due for companies using the quarterly scheme with 31/12/2014 year ends
April 1st Start of the financial year for Corporation Tax
April 3rd Good Friday Bank Holiday
April 5th Last day for ISA contributions 2014/15
April 6th Easter Monday Bank Holiday
First day of the new tax year
Income tax basic personal allowance raised to £10,600 for 2015/16
2015/16 ISA opens with maximum of £15,240
April 14th Corporation tax Self-Assessment payment due for companies using the quarterly scheme with 31/12/2014 year ends
April 19th Deadline for final RTI submission of the year
April 20th Interest will begin to accure on unpaid PAYE/NI for 2014/15
April 22nd PAYE remittance due to HMRC for the 2014/15 tax year
May 1st Start of daily penalties for 2014 online Tax return not yet filed
May 31st Last day to issue 2014/15 P60’s to employees
July 6th Deadline for entering into a PAYE Settlement Agreement for 2014/15
July 22nd Online payment for quarter 1 2014/16 PAYE remittance due
July 31st Second Self-Assessment payment on account for 2014/15 tax year
October 1st Due date for Corporation Tax payments for the period ended 31st December 2014
October 22nd Online payment for quarter 2 2014/15 PAYE remittance due
October 31st Last day to file paper Self Assessment Tax Returns for 2014/2015 to avoid penalties
November 1st £100 penalty if your 2015 paper Tax Return is not yet filed. No penalties will apply if an online return is filed by 31st of January 2016
December 31st Filing date for Company Tax Return Form CT600 for period ended 31 December 2014
2016 January 1st Due date for Corporation Tax payments for the period ended 31st March 2015
January 22nd Online payment for quarter 3 2015/16 PAYE remittance due
January 31st First Self-Assessment payment on account for 2015/16 tax year
January 31st Online filing deadline for Personal Self Assessments for 2014/2015
February 1st £100 penalty if your 2015 Tax Return is not yet filed online.
March 25th Good Friday Bank Holiday
March 28th Easter Monday Bank Holiday
March 31st End of Corporation Tax financial year
Filing date for Company Tax Return Form CT600 for period ended 31 March 2015
April 1st Start of the financial year for Corporation Tax
April 5th Last day for ISA contributions 2015/16
April 6th First day of the new tax year
Income tax basic personal allowance raised to £11,000
2016/17 Help to Buy ISA commences
Change to dividend tax rules commence
April 22nd PAYE remittance due to HMRC for the 2015/16 tax year
May 2nd May Day Bank Holiday
May 30th Spring Bank Holiday
July 22nd Online payment for quarter 1 2015/16 PAYE remittance due
July 31st Second Self-Assessment payment on account for 2015/16 tax year
October 1st Due date for Corporation Tax payments for the period ended 31st December 2015
October 22nd Online payment for quarter 2 2015/16 PAYE remittance due
October 31st Last day to file Income Tax Self-Assessment paper Returns
December 25th Christmas Day Bank Holiday
December 26th Boxing Day Bank Holiday
December 31st Filing date for Company Tax Return Form CT600 for period ended 31 December 2015
2017 January 1st New Years Day Bank Holiday