14/ 09 Due date for Corporation Tax quarterly instalment for large companies with year-end 31st March 2023
19/ 09 Monthly deadline for postal payments of CIS, NICs and PAYE to HMRC
22/ 09 Monthly deadline for electronic remittance of CIS, NICs and PAYE to HMRC
30/ 09 CT61 Quarterly Period ends
30/ 09 Corporation Tax Returns filed by companies with 31st December 2022 as year-end

